I've got to know, anyone getting 60MPG in town with multiple high mileage tanks??

josh8loop

Veteran Member
Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
Fellas,


I want to find out if anyone on the forum is doing 60 MPG in town for multiple tanks? I've had about 6 tanks so far that have yielded 60 MPG or more in town. I don't use AC, have a scan gage, .681 5th, timing a couple degrees advanced, and run the higher temp "Hybrid" T-stat. I fill up about every 3 weeks(900 miles) and do about 50 miles total per day and some additional mileage on the weekend. My SG tells me I average 32-35 MPH on my trips to and from work. I do anticipate lights, and don't get involved driving wise in everyone elses rush. My tires are really cheap(Falkens)-not really low RR tires, and I keep them at max sidewall(51psi).



Kind of funny- I slowed down my top speeds, and increased my average speed and fuel mileage at the same time! Kinda nice knowing I can get home safe and sound to the kids and wife with good MPGs and a few minutes earlier now that I slowed down a bit. If only others understood that! I know I have said that my "Hybrid" 205 Deg F T-stat was to the best of my knowledge good for a 3-4 MPG bump in my case at least. I'm wondering if it isn't worth more than that for me.
 

josh8loop

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Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
Thank you Sir! :)


I forgot those MPG figures are all pen and paper, and the tank has a ventectomy if that matters.
 

Wksg

Veteran Member
Joined
Aug 2, 2008
Location
Ann Arbor MI
TDI
2003 GLS TDI Wagon
I've done it, three 60+ mpg, 1000+ mile tanks, but in the summer when it's warm and mostly highway driving, ~60-65 mph. I'd be very surprised if I could do that in town.
 

NewOwner

Veteran Member
Joined
Mar 20, 2009
Location
North East
TDI
2002 Jetta
Fellas,


I want to find out if anyone on the forum is doing 60 MPG in town for multiple tanks? I've had about 6 tanks so far that have yielded 60 MPG or more in town. I don't use AC, have a scan gage, .681 5th, timing a couple degrees advanced, and run the higher temp "Hybrid" T-stat. I fill up about every 3 weeks(900 miles) and do about 50 miles total per day and some additional mileage on the weekend. My SG tells me I average 32-35 MPH on my trips to and from work. I do anticipate lights, and don't get involved driving wise in everyone elses rush. My tires are really cheap(Falkens)-not really low RR tires, and I keep them at max sidewall(51psi).



Kind of funny- I slowed down my top speeds, and increased my average speed and fuel mileage at the same time! Kinda nice knowing I can get home safe and sound to the kids and wife with good MPGs and a few minutes earlier now that I slowed down a bit. If only others understood that! I know I have said that my "Hybrid" 205 Deg F T-stat was to the best of my knowledge good for a 3-4 MPG bump in my case at least. I'm wondering if it isn't worth more than that for me.
Wow that is great. How do you get 60 MPG? I only get 45 MPG and I have 02M box. How do you drive? What rpms you maintain? At what rpms you up/down shift? Any insights will be appreciated.
 

josh8loop

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Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
I've done it, three 60+ mpg, 1000+ mile tanks, but in the summer when it's warm and mostly highway driving, ~60-65 mph. I'd be very surprised if I could do that in town.


For some reason my Hwy MPG drops down to mid 50's on the Hwy at 65-68 MPH. My car has fresh suspension that keeps it a little higher in that air than it was with the old stuff. Also, my tires aren't really made for MPG's and may give me more of a hit at the higher speeds.
 

josh8loop

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Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
Wow that is great. How do you get 60 MPG? I only get 45 MPG and I have 02M box. How do you drive? What rpms you maintain? At what rpms you up/down shift? Any insights will be appreciated.
I try to get into high gear as soon as possible. I don't mind being in 5th at 40MPH on level ground. I don't accelerate very aggressively just enough to get me into high gear the soonest. Really the ScanGage helps alot and gives you real time feedback about avg MPG's. It added about 5MPG to my averages after I got it. If you get one just try to drive in a way that you average 32-35 MPH on a 25 mile in town traffic route, and that will be basically how I'm driving. As far as tips, get a SG and make sure the vehicle is in top notch maintenance. Thermostats MAF sensors, MAP sensors, VNTs need to be freely moving, vacuum system needs to be tight and working well,
N-75, and N-18 need to be in good condition too. Gear box oil changes are a good thing, air filter and fuel filter need to be changed as needed. I still maintain that IP case pressure needs to be set to factory pressure, and timing advanced. One thing though is that I do have the smallest injectors(remnants from the 01m setup I used to have) but that is coupled with the 11mm pump. My nozzles have 170k miles on them, and I don't have a tune. I would most likely go up if I got new nozzles and a tune though.
 

alloutdoorsboy

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Joined
Dec 30, 2006
Location
Va
TDI
2000 jetta
Forgive my ignorance but just a quick question, I just ordered a scan gauge II for our cars and am wondering how accurate is the MPG feature as compared with calculating it on paper??? I cannot wait to get it so I can see real time whats going on as opposed to waiting weeks to fill up...
 

josh8loop

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Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
Forgive my ignorance but just a quick question, I just ordered a scan gauge II for our cars and am wondering how accurate is the MPG feature as compared with calculating it on paper??? I cannot wait to get it so I can see real time whats going on as opposed to waiting weeks to fill up...

I haven't found it to be extremely accurate-pen and paper is always the best and sure method. Along with vented tank, and always filling the same way. The SG does give you relative MPG feedback in real time that is highly helpful. I also display coolant temp, boost, avg MPG, and instant MPG.
 

NewOwner

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Mar 20, 2009
Location
North East
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2002 Jetta
I guess I have work to do. I will be looking into buying a scan gauge as quickly as possible. I have few questions. Any insights on how much it will cost? Where to position it? How much a tdi tech will charge? Thank you.
 

josh8loop

Veteran Member
Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
I guess I have work to do. I will be looking into buying a scan gauge as quickly as possible. I have few questions. Any insights on how much it will cost? Where to position it? How much a tdi tech will charge? Thank you.


The scan gage requires no special installation. Just plug it into the OBD2 plug and then read the manual to get it set up correctly. It takes a few full tanks to get it calibrated so the MPG readout is close to actual calculated values. Cost is from $114-150 bucks or so on eBay.
 

NewTdi

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Joined
Jan 15, 2004
Location
NorCal
TDI
2003 Bora, Reflex Silver
Forgive my ignorance but just a quick question, I just ordered a scan gauge II for our cars and am wondering how accurate is the MPG feature as compared with calculating it on paper??? I cannot wait to get it so I can see real time whats going on as opposed to waiting weeks to fill up...
I can say that my scan gauge II is quite accurate. The volume of fuel pumped vs the volume of fuel recorded is usually off by a fraction of a gallon. On my last fill-up the actual pumped was 14.695 and the scan gauge II recorded 14.8.
 

BioBob

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Jul 18, 2006
Location
Raleigh NC
TDI
2001 Jetta (G3F Donor), 2003 Bora
Inaccurate SG II

I have a Scangage that is INACCURATE!

It does not recognize that I am off the pedal (9999) until the RPM's get down to less than 1100 Rpm, thus I get a different adjustment factor every tank, based on the time I am off the pedal, i.e. more accurate in highway driving and much less so in town.

I have discussed this with the factory, and they refuse to make any corrections.

I have changed to an UltraGauge which gives me twice the accuracy at less than half the cost ($70). It also allows immediate reading of all the ECU outputs by scrolling from one page to another (you set up the pages).

No, I am not connected to Ultragauge, just a dis-satisfied SG II user. As Clark Howard would say "they have a Customer No Service Department."
 

josh8loop

Veteran Member
Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
I have a Scangage that is INACCURATE!

It does not recognize that I am off the pedal (9999) until the RPM's get down to less than 1100 Rpm, thus I get a different adjustment factor every tank, based on the time I am off the pedal, i.e. more accurate in highway driving and much less so in town.

I have discussed this with the factory, and they refuse to make any corrections.

I have changed to an UltraGauge which gives me twice the accuracy at less than half the cost ($70). It also allows immediate reading of all the ECU outputs by scrolling from one page to another (you set up the pages).

No, I am not connected to Ultragauge, just a dis-satisfied SG II user. As Clark Howard would say "they have a Customer No Service Department."

That's interesting! I will have to check mine in that regard too. Yesterdays fillup the SGII was only .9MPG off from the actual, so it looks like It is getting dialed in more closely with time. The SG said 64.4MPG, and actual was hand calculated at 63.5MPG-I only pushed this tank to 957 miles(all I felt comfortable with), but it looks like if I keep this up I will be at 1000 mile tanks for in town driving. One of the very best tanks with this car by a long shot! Not sure why it was so high, but can't argue with that MPG figure for 957 miles. I did have the CTS disconnected since it was failed on the ECU temp sensing portion and not allowing the GP's to cycle.
 

MikeMars

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Joined
Mar 6, 2008
Location
UK
TDI
Vento 1.9 TDi (retired), A4 1.9 TDi (rear end collision), VW Passat 1.9 TDi (retired), Audi A2 1.4 TDi
I have a Scangage that is INACCURATE!

It does not recognize that I am off the pedal (9999) until the RPM's get down to less than 1100 Rpm, thus I get a different adjustment factor every tank, based on the time I am off the pedal, i.e. more accurate in highway driving and much less so in town.
...
I'm very doubtful that these two things are related.


Regarding your first point, exactly what gauges are you looking at, and exactly what are the driving conditions at that moment in time? After all, MPG can be anywhere between zero to infinity when your foot is off the pedal (idling at a halt vs. underrun vs coasting in neutral etc etc).


LOD always shows zero when my foot is off the pedal & the car is in underrun. MPL gives me a plausible-ish figure (although never 9999). The horsepower figure is laughable (a linear relationship to RPM at max throttle throughout the entire RPM range) but probably within a factor of 2. I know there is a throttle-position-sensor-threshold setting which can be changed, although I haven't bothered (I think the default is 24% or something like that).


The city vs. highway difference is more to do with the fact that the scangauge is basically doing dead-reckoning (based on airflow, throttle position, & a few others), but there is only the one overall adjustment, and no way to adjust individual factors. If one tank has a similar journey profile to the next, then it will give a reasonably accurate predication. If one tank is city driving and the next is highway, it won't be right because it is using the single crude adjustment.

Mine is usually right to within a litre or less, but I do pretty much exactly the same trips every tank. I don't use it to find my tank-to-tank MPG (since I know that anyway from refuelling), but it does give me insight into comparing individual journeys.
 
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Ike T

Well-known member
Joined
Apr 27, 2009
Location
US
TDI
2003 Jetta
Off original topic.

My experience is the fuel economy feature of the SG II does not perform its best outside of reasonably consistent conditions.

I was able to dial in my SG II to 0.2 gallon accuracy for 10+ tanks when I lived in GA. I had the same, long-distance, steady-speed commute over rolling (not steep) terrain. I learned quite a bit about fuel economy by using the device. Then, I moved to CA for 18 months and was driving in a small, congested town with steep terrain and varying traffic speeds. Lots of short trips plus some longer highway trips. I couldn't get the SG II dialed in at all, often more than a gallon off between each fill up. Lots of overrunning down the hills (2 to 3 mile stretches of overruns) and varying RPM/speed/throttle combinations up the hills.

I don't really use the device for economy purposes now that I've learned a few things, but I still use it for other features. I still tally up mileage by pen and paper at fillup.

My SG II rarely shows 9999 at zero throttle input. Usually, the number shown appears to be the speed divided by 0.01. I don't know if that's an issue with the SG II or if a very small amount of fuel is being passed at overrun.

I have vented the fuel tank since before I purchased the SG II.
 
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MikeMars

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Location
UK
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Vento 1.9 TDi (retired), A4 1.9 TDi (rear end collision), VW Passat 1.9 TDi (retired), Audi A2 1.4 TDi
...

My SG II rarely shows 9999 at zero throttle input. Usually, the number shown appears to be the speed divided by 0.01. I don't know if that's an issue with the SG II or if a very small amount of fuel is being passed at overrun.

...
Either way, that isn't going to make much difference to the overall MPG for the trip or the journey, which is why I think Bob's two observations are unrelated.
 

Honeydew

Top Post Dawg
Joined
Nov 28, 2006
Location
Florida
TDI
13 Passat DSG
It does not recognize that I am off the pedal (9999) until the RPM's get down to less than 1100 Rpm
My SG used to display 9999 when off pedal at all times. Since sending it in for x-gauge firmware update a few years ago it performs as you describe.
 

hip001

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Joined
Jan 14, 2008
Location
Gainesville, Georgia
TDI
2015 Golf Sportwagen TDI SEL dsg
I have to chime in here with my $.02 also.

CONGRATS to you guys getting 50's & 60mpg in your TDI's !!!! I did 58mpg in my beetle one tank hypermiling but I could not drive like that everyday with no AC in a black car!

My scan gauge is not accurate in mpg either, BUT I use it as a reference watching the "actual mpg" display as I'm driving and trying to achieve a high "average mpg"by the time I get to work. It has helped me improve my mpg overall using it this way. I calculate it on paper every time for the accurate actual mpg and have verified miles with my gps too. I'm getting 43-45mpg in the 01 Beetle and 40-42mpg in the 06 Jetta.
Not sure if this could make a difference, but I saw somewhere that scan gauge has a newer REV or the software?? I've not checked mine yet to see what version of the software mine has.
Side note: I just became aware of the "ultra gauge" yesterday and for what it cost I may buy one just to try in my other TDI.
 
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tdidriver20

Well-known member
Joined
Mar 2, 2011
Location
Pennsylvania
TDI
2003 TDI
Couple of questions from ignorance.

are you (read: multiple people) saying that with a ventectomy the sg will not work?
if you could fill me in on what a ventectomy as well, it might help.

also, is a scan gauge E any good? i found one on craigslist near me, but didn't know if it would perform the same.

any guidance is appreciated, as I have a long commute daily and would really like to help mpg

thanks
 

MikeMars

Veteran Member
Joined
Mar 6, 2008
Location
UK
TDI
Vento 1.9 TDi (retired), A4 1.9 TDi (rear end collision), VW Passat 1.9 TDi (retired), Audi A2 1.4 TDi
... are you (read: multiple people) saying that with a ventectomy the sg will not work?
if you could fill me in on what a ventectomy as well, it might help.
A ventectomy will not affect the scangauge in any way. It is simply a time-saving way to brim & vent the tank quicker. Venting is letting the air out of the expansion chamber to maximise the amount of fuel in the tank by pressing the little button just inside the filler pipe.
 

SD26

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Joined
Jan 7, 2010
Location
WI
TDI
1998 Jetta TDI 5sp, 2002 Jetta TDI 5sp
.681 5th, timing a couple degrees advanced, and run the higher temp "Hybrid" T-stat. I fill up about every 3 weeks(900 miles) and do about 50 miles total per day and some additional mileage on the weekend. My SG tells me I average 32-35 MPH on my trips to and from work. I do anticipate lights, and don't get involved driving wise in everyone elses rush. My tires are really cheap(Falkens)-not really low RR tires, and I keep them at max sidewall(51psi).



Kind of funny- I slowed down my top speeds, and increased my average speed and fuel mileage at the same time! Kinda nice knowing I can get home safe and sound to the kids and wife with good MPGs and a few minutes earlier now that I slowed down a bit. If only others understood that! I know I have said that my "Hybrid" 205 Deg F T-stat was to the best of my knowledge good for a 3-4 MPG bump in my case at least. I'm wondering if it isn't worth more than that for me.
Thanks for your data!

When you did the Hybrid t-stat, did you do Evans and/or upgraded head studs? Disconnect the cooling fan?

Can you tell us about your commute? Maximum posted speed and what kind of speed you usually do.

And do you wish that you would have gone to the gear taller than the .681?
 

josh8loop

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Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
Thanks for your data!

When you did the Hybrid t-stat, did you do Evans and/or upgraded head studs? Disconnect the cooling fan?

Can you tell us about your commute? Maximum posted speed and what kind of speed you usually do.

And do you wish that you would have gone to the gear taller than the .681?



When I first installed the "Hybrid" T-stat I didn't do anything in regard to the head studs or evans coolant. Still haven't-bone stock in that regard. I have removed functionality of the stage 1 fans though. My fans still work when the AC runs, and if the temp gets really high. The T-stat has been very reliable and consistent temp wise.

Commute is right around 26 miles one way. Approx 18 stop lights from point A to point B. I try to catch as few as possible. First stretch of 2 miles is 40 max posted, second stretch is 16 miles with max of 45 posted, third stretch is 2 miles of 35 max posted, and then the fourth stretch of 4 miles is 45 posted max, and the final is 50 MPH max for 2 miles. I try to stay between 42-45 MPH range. Average is from 32-35MPH for the trip most days.

I am happy with the .681 since I don't do much highway commuting. If I spent more freeway time maybe a slightly taller 5th would be in order. Overall I'm happy with the .681, and the jump between 4 and 5th isn't uncomfortably steep with a stock tune/injectors.
 

SD26

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Jan 7, 2010
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WI
TDI
1998 Jetta TDI 5sp, 2002 Jetta TDI 5sp
When I first installed the "Hybrid" T-stat I didn't do anything in regard to the head studs or evans coolant. Still haven't-bone stock in that regard.
Thanks for your information!

I have removed functionality of the stage 1 fans though. My fans still work when the AC runs, and if the temp gets really high.
And that is adjustable with the VAG COM?

Commute is right around 26 miles one way. Approx 18 stop lights from point A to point B. I try to catch as few as possible. First stretch of 2 miles is 40 max posted, second stretch is 16 miles with max of 45 posted, third stretch is 2 miles of 35 max posted, and then the fourth stretch of 4 miles is 45 posted max, and the final is 50 MPH max for 2 miles. I try to stay between 42-45 MPH range. Average is from 32-35MPH for the trip most days
I'll have to come up with my list. My commute is about one mile longer, and I have longer areas where the speed limit is posted at 55MPH.

I am happy with the .681 since I don't do much highway commuting. If I spent more freeway time maybe a slightly taller 5th would be in order. Overall I'm happy with the .681, and the jump between 4 and 5th isn't uncomfortably steep with a stock tune/injectors.
Seems like the .681 is really a good compromise, but I wish I could try the taller one.
 

josh8loop

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Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
Counted the stop lights again this morning, and I have 24. Six more than previously thought. I will pay more attention this afternoon, and tomorrow AM to see how many I end up catching normally. As far as removing the Stage 1 fan speed functionality: This cannot be done(that I know of) through Vag Com since it is hard wired through the FCM(Fan Control Module). I ended up cutting one wire that goes to the Stage 1 thermal switch while leaving the Stage 2 thermal switch active. Fans are fully functional when the AC is kicked on. On the way to work I reach 205 Deg F after 20 stoplights(approx 18 miles). Coming from work I'm at operating temp after approx 5 miles.

As far as the taller gear, perhaps a 6-speed would work for you? They have an add on 6th or you could go with a whole Ryan P 6-speed conversion. FWIW
 
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SD26

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WI
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1998 Jetta TDI 5sp, 2002 Jetta TDI 5sp
As far as removing the Stage 1 fan speed functionality: This cannot be done(that I know of) through Vag Com since it is hard wired through the FCM(Fan Control Module). I ended up cutting one wire that goes to the Stage 1 thermal switch while leaving the Stage 2 thermal switch active. Fans are fully functional when the AC is kicked on.
Well, that's not so bad since I don't have a VAG COM. :D

I'm asking a whole lot of questions...

Where is that thermal switch, and do you remember the color coding on the wire you cut?

As far as the taller gear, perhaps a 6-speed would work for you? They have an add on 6th or you could go with a whole Ryan P 6-speed conversion. FWIW
All a matter of money, right? I don't do a whole lot of highway driving, but I know that my A3 really looses MPG at higher interstate speeds. Not sure what I'm doing on that part, but I think I will move forward on the thermostat.
 

josh8loop

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Joined
Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
Dave,

On the Mk 4 the fan thermal switch is on the drivers side of the radiator in the middle I believe. I remember 3 wires coming from it on mine, and I'm not sure of the colors. On the wiring diagram I noticed what looked like a sensor that had essentially two separate thermal switches(Stage 1, and stage 2) packaged together with a common feed wire. When the thermal strip within the switch senses the temperature it is set for, it closes the circuit. When temps are cool the switches are open, and when they close it activates it's associated fan speed. When I cut that wire, it basically made the vehicle never see the temperature to activate the low speed fans. The high speed fan and the AC demand for fan are still functional as mentioned before. I will have to see if I can find the wiring colors. I must admit, I cannot specifically say I noticed an increase in fuel mileage from the fan mod, although every once and a while with the hybrid T-stat I did notice it coming on so the low speed fans were consuming some electrical energy at times due to the elevated temps. Ideally I would like to have an electronic operated user selectable temperature the stage 1 fans would be activated instead of the thermal strip operated unit.
 

SD26

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Jan 7, 2010
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WI
TDI
1998 Jetta TDI 5sp, 2002 Jetta TDI 5sp
Awesome, Josh! Thanks for your help!
 

josh8loop

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Sep 15, 2009
Location
Vero Beach, Fl.
TDI
2002 VW Jetta TDI Manual(performed 01M to 5-speed swap) - 183,000 miles and climbing!
Heres a quote from the modified thermostat thread on page 13:




"DF,


Hopefully you got your car issues sorted out on the tensioner/alt pulley deal. This weekend while driving(my wifes gasser as mine is under the 01m-5 speed knife) I was thinking about our issue with the fans kicking on too early for our "Hybrid" T-stats. I was able to look at the Bentley, and it seems that we can cut one wire on the radiator thermal switch and install a toggle switch which will disable the Stage 1 fans from coming on. This will render the Stage 2 fans operable, and also the fans would be operable when required by the AC but the low temp slow fan kick on would be disabled. If I wanted to go back to normal I could just flick the switch back one, and all would be back to stock.

Stage 1
Switch on .......................197-206 deg F(92-97 DegC)
Switch off........................183-195 deg F(84-91 Deg C)

Stage 2
Switch on ........................210-221 Deg F(99-105 Deg C)
Switch off.........................195-208 Deg F(91-98 Deg C)




In the latest days testing the "Hybrid" T-stat I did notice the fans kicking on, so I know that is sapping some MPG's from my numbers. Looks like this will be an easy way to make our fans not kick on until it reaches 210 Deg F."






Dave,

I will see if I can find wire colors for you.
 

Intech

Veteran Member
Joined
Jun 25, 2005
Location
S. Central Pa USA
TDI
2003 Jetta GLS, 1999.5 Golf 2 dr
Fellas,


I want to find out if anyone on the forum is doing 60 MPG in town for multiple tanks? I've had about 6 tanks so far that have yielded 60 MPG or more in town. I don't use AC, have a scan gage, .681 5th, timing a couple degrees advanced, and run the higher temp "Hybrid" T-stat. I fill up about every 3 weeks(900 miles) and do about 50 miles total per day and some additional mileage on the weekend. My SG tells me I average 32-35 MPH on my trips to and from work. I do anticipate lights, and don't get involved driving wise in everyone elses rush. My tires are really cheap(Falkens)-not really low RR tires, and I keep them at max sidewall(51psi).



Kind of funny- I slowed down my top speeds, and increased my average speed and fuel mileage at the same time! Kinda nice knowing I can get home safe and sound to the kids and wife with good MPGs and a few minutes earlier now that I slowed down a bit. If only others understood that! I know I have said that my "Hybrid" 205 Deg F T-stat was to the best of my knowledge good for a 3-4 MPG bump in my case at least. I'm wondering if it isn't worth more than that for me.
In my 03' Jetta, if I keep it at 50 MPH or lower, I get consistent 60+ MPH in the suburbs (not really city driving). I've got the 2.5" exhaust, VNT17/22, RC3, G60/VR6. When I first started getting that mileage I was dubious, but it's been consistent since then. At 70-75 MPH it's down to about 50-51 MPG. I have the .681 in the Golf, and it only increased MPG's by about 1 or 2
 
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