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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old March 14th, 2019, 18:51   #16
Nero Morg
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Sooooo you gonna share what mods you have on your wagon? I may try to copy it
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Old March 14th, 2019, 19:26   #17
IndigoBlueWagon
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Stock block and head (although I may have an SDI cam, not sure), PD150 airbox, snorkel, MAF, and turbo inlet, PD150 intake manifold, Tyrolsport intercooler, PD lift pump, 11mm pump, PP357s, Rocketchip Stage 3+, Mahle VNT-15, 2.5" downpipe and exhaust, resonator and muffler, no CAT, SBC Stage 2 daily clutch.

I think that's it. One problem with owning a car for 17 years is you forget what you've done to it. Some of the mods are 12 years old. My average on Fuelly for the last 168K miles is 46.3 MPG. The speed you see above is my usual trip cruising speed. Commuting I go with traffic, which around here is often running at 80+. Unless it's stopped.
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Old March 14th, 2019, 19:43   #18
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Nice! Now then, what brands of fuel and oil? Oh, and EGR state?
Thank you, BTW!
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Old March 14th, 2019, 20:12   #19
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Quote:
Originally Posted by IndigoBlueWagon View Post
Now you did it. I wasn't going to brag, but this is from a trip home from NC last Summer:

That tank was 52.2 MPG.
OK
So if you go 405.3 miles using 1/4 tank then you can go 1621.2 miles on a tank?

I rolling my pants legs up because it's getting a bit deep.
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Old March 14th, 2019, 20:17   #20
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No. that's the thing: the fuel gauge is horribly inaccurate on these cars. IBW will pass just over 800 miles when the warning light comes on. The fuel gauge you're looking at is trying and failing to tell the driver he has half a tank remaining. Really wish they were more accurate. Thus Bob's recommendation to do full tanks for calculating FE. Closest practical estimate possible.
EDIT: And...52.2 MPG in an assumedly vent-less tank = around 835.2 miles/tank.
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Last edited by STDOUBT; March 14th, 2019 at 20:20.
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Old March 14th, 2019, 21:00   #21
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I haven't done the ventectomy yet, have been debating about it. Mostly worried about tank expansion from it being full and wrecking a tank. You've been running the ventectomy for a while, any regrets?
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Old March 14th, 2019, 21:08   #22
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No regrets (years ventless), and I always ask the attendant to fill it to the top. They 99% of the time oblige ( Past 9 years same station every time). Yes, everyone, we Oregonians are not allowed to pump our own fuel...we have highly paid professionals for that. I actually don't mind, and even tip them...not uncommon here so I hear.
But Nero, being the fretful, helicopter owner of this '03, I did a lot of reading here, and convinced myself the vent is good for nada on a diesel tank. No danger to the public even.
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Old March 15th, 2019, 04:47   #23
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I took that photo in part as a joke. As STDOUBT says, these gauges aren't the most accurate. At that point in the drive I hadn't stopped and shut the car down since filling, and when I restarted the car (shortly after the photo) the tank read lower.

Here's the rest of the tank:


Still not too shabby. Vent has been removed on my car forever, probably for 12 years. Never had any problems. I don't have vents in any of my TDIs where they're removable.

Since I have a PD150 intake manifold no EGR cooler. EGR is in place, anti-shudder valve works, but the tune has no EGR duty cycle in it. And no, I don't have any issues with the car warming up in the winter. I usually use Total Quartz 9000, and I have my own fuel tank at my house with good diesel and an Opti-Lube dose in the tank, but nothing special. And on trips, of course I fill wherever. Not that picky.
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Old March 15th, 2019, 20:05   #24
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Quote:
Originally Posted by Nero Morg View Post
I haven't done the ventectomy yet, have been debating about it. Mostly worried about tank expansion from it being full and wrecking a tank. You've been running the ventectomy for a while, any regrets?
I have been doing myself but use the nozzle to open the vent.
My MPG varies a bit but I don't worry about it.
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Old March 15th, 2019, 20:15   #25
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I'll have to do the mod. We're spoiled over here and have fuel attendants here. Not illigal to pump your own diesel but they sure look at you funny.
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Old March 15th, 2019, 20:21   #26
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Yes, do the mod. It allows the car to have more range and gives you consistent fillups, so you can calculate FE more accurately. I have done it on two of my ALHs. No problems with it.
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Old March 16th, 2019, 04:39   #27
IndigoBlueWagon
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I fill until I see clear fuel in the filler neck. Done it for years. No problems. I usually add 15.5 gallons if I fill right when the reserve light comes on. Most I've ever added is 17.1.
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Old March 16th, 2019, 08:25   #28
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Something that I think may have been overlooked. Have you checked your tire pressures lately. As I see my MPG's go down in the winter, I check my tires. and usually I have 1 or more low. I run 40 psi on all 4 corners and have you had an alignment lately?
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Old March 16th, 2019, 08:39   #29
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I check the tire pressure at least once every two weeks, keep a gauge in the door pocket. I have yet to get an alignment though. It doesn't feel off when driving on the freeway, but that still doesn't mean it's at least 1 degree off.
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Old March 16th, 2019, 20:38   #30
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Here's my mileage since last year January.
Hope it pastes OK

Model Date Gallons Per Gallon Total Mileage Additive Notes Vender MPG
Jetta TDI 03 1/31/2018 6.861 $3.06 $20.99 232.8 $1.30 Idle 30 minutes for accident Quick Check Ramsey 33.93
Jetta TDI 03 3/6/2018 12.817 $3.06 $39.21 446.4 $2.60 Cleaner & Anti-Jel Quick Check Monroe 34.83
Jetta TDI 03 6/16/2018 12.012 $3.12 $37.47 507.7 $1.30 Quick Check Monroe 42.27
Jetta TDI 03 9/22/2018 13.795 $3.00 $41.37 528.1 $1.30 1st Time Vented Tank 260211 Quick Check Monroe 38.28
Jetta TDI 03 11/9/2018 15.233 $3.12 $47.51 521.8 $1.30 2nd time venting 260733 Quick Check Monroe 34.25
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