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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old October 22nd, 2019, 00:51   #16
WED
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Thanks Jetta Pilot

Found them, they're from all the way back to 2013 Jetta hybrids so now they are selling for cheap. I
BTW I don't intent to hold anyone up...
I pull a heavy duty 5 x 8 aluminum trailer, which for the record is as large is a large as a full size pickup truck at 40 sq ft. feet, larger than my 4 x 9 utility body work truck at 36 sq ft. I upgraded the trailer from a 2,000 lb Axel to a 3,500 lb torsion axle with brakes... Weighs in at 500 lbs.
I'm also running a blue tooth Curt Echo brake controller which works well.
I can drive up any freeway grade, thus far, easily going 65 mph.
As a Building and Electrical Contractor this has greatly expanded the usefulness of my little diesel. My truck now sits at the job...
My next task at hand it to break the parachute which is following me being the front of that damn trailer.
This is our first prototype for the front with a cover for the top to follow shortly. I'm doing fuel mileage tests now to document the difference, before and after we install the nose cone.
We also installed Firestone airbags in the rear springs. With the free wood I am hauling it is easy to adjust it so my tongue weight is around a hundred and 120 lb with a scale.
Fun 4 me...

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Old October 22nd, 2019, 01:05   #17
WED
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I am patient so I'm not sure about the reproduction but here are the specs.
I believe the offset on my 17's are 49.00mm where these are 50.00mm.
I also understand that reproductions might not be apples and apples so more fun research.
Also the picture in the previous text was prior to the Firestone airbags and the entire back of my wagon was stuffed with hundreds of pounds of gear...
Fyi Bill

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Old October 22nd, 2019, 05:35   #18
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Quote:
Originally Posted by IndigoBlueWagon View Post
They fit. Golfs and Sportwagens with the 1.4 and 1.8T have the same brakes and come with 15s.

However, I think the offset for the GSW wheels are 35, not 50. That may be a problem.
Unless i forgot, i said if its a TDI Wagen, 15" wont fit because of the large 312mm breaks.
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Old October 22nd, 2019, 05:40   #19
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Yea im pretty sure the smallest you can go are 16". I tried some 15" i had from a different car. rear worked, front not so much. that being said, the 205//50r16 is stock. you could go 195/ 55 r16 in a LRR tire. When i switch from my 17s to my 16 my FE goes up by about 2mpg highway. I put my 17s on because winter. The 16s have a LRR tire and the 17s are a very good Multi season.
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Old October 22nd, 2019, 09:09   #20
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Thx DC

I had another friend chime in about taction also especially hauling a trailer in wet weather so it looks like some new LRR 17's for now.
I do believe some Pizza cutters are in my future though...

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Old October 22nd, 2019, 10:09   #21
IndigoBlueWagon
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2015 Golf Sportwagens have 288mm front brake rotors. '14 and earlier had 312s.
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Old October 22nd, 2019, 10:55   #22
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Quote:
Originally Posted by IndigoBlueWagon View Post
2015 Golf Sportwagens have 288mm front brake rotors. '14 and earlier had 312s.
Oh. That is strange. I guess im wrong. the early mk6 had 288mm which was increased to 312 for the rest of the run. i wonder why they decided to go to the smaller ones on the mk7 gsw
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Old October 22nd, 2019, 11:00   #23
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Quote:
Originally Posted by WED View Post
Thx DC

I had another friend chime in about taction also especially hauling a trailer in wet weather so it looks like some new LRR 17's for now.
I do believe some Pizza cutters are in my future though...

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Well scratch my earlier outburst. being you have a mk7. They have 288mm front rotors. so you should be able to fit 15" rims. find a junkyard and find a set.
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Old October 22nd, 2019, 11:17   #24
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Quote:
Originally Posted by DivineChaos View Post
Oh. That is strange. I guess im wrong. the early mk6 had 288mm which was increased to 312 for the rest of the run. i wonder why they decided to go to the smaller ones on the mk7 gsw
There is no such thing as a "mk6 Sportwagon". The Jetta/Golf wagon continued on the A5 underpinnings, same as the 2005.5-2010 Jetta sedan. They just gave them a minor facelift and a revised dashboard after that first year. It is all the A5 underneath.

The only A6 sold here was the Golf. That's it. But, both the A5 and A6 are very similar, there is not a huge difference.

And of course the Jetta sedan started with the NCS platform in 2011, which is completely different.

But VAG has a habit of parts binning certain things over certain models. The base NCS Jetta S with the SOHC 115hp 2.0L engine for instance has the same small front brakes as the A4 2.0L/TDI cars do, but the NCS with the 2.5L, 2.0L turbo gas, or the TDI, all have the same front brakes as the standard A5 did.

You want some REAL confusion, look at the T'reg/Q7/Cayenne as well as some (most) of the bigger Audis. You essentially have to get the tape measure out to order brakes for those.
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Old October 22nd, 2019, 19:00   #25
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What about the (Astana?) wheels from the e-Golf? I think they are smaller than the most recent ones on the Jetta Hybrid, and designed for aero FE gains. Not sure how much they weigh. The 15's linked will prolly weigh less, but the aero advantage on the highway for the e-Golf versions may be significant. Someone else would have to chime in on the effect, if any, on decreased venting for the rotor with Astanas.
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Old October 22nd, 2019, 21:00   #26
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I checked out some other electrics and hybrids today.
The Chevy Volt has 17 x 7's like my 2015 SE sport wagon and they run 215 /50 R17 Michelin Energy Saver All Seasons
Tire diameter is about +.5" which is close to my stock.
The new Volt is about 3,535 lbs and I am around 3,225 lbs.
Then a newish Honda hybrid with the same model tire in 215/55 R16
Looks like there is a trend here.

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Old October 22nd, 2019, 23:31   #27
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I went to the Michelin Energy Saver A/S website and found that both the potential tires sizes I'm looking at come in two options for each size. I didn't see a difference until I noticed that one out of the four has a 51 PSI Max while all the other three have a maximum PSI of 44...
My stock 225/45/17 = 24.97" x 8.86 w
215/50/17 = 25.50" x 8.90 w
205/60/16 = 24.90" x 8.40 w
90V SL BSW 215/50/17 44 psi max
91H SL BSW 215/50/17 44 psi max
91H SL BSW 205/55/16 44 psi max
91V SL BSW 205/55/16 51 psi max
When I look at the differences incise I'm a surprise that the 215/50/17 is wider than the 225. The 91V 205 may be the golden egg I guess, at least for today.
Looks like I might be getting a set of 16' after all.

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Old October 23rd, 2019, 05:57   #28
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FWIW, I had Michelin Energy Savers on my MKIV on 15" wheels. Scary to drive. Soft sidewalls, very little grip, terrible in rain. Took them off after 8K miles before I had an accident. Now running General Altimax RT43s, and love them. 25K on them and little noticeable wear. And I'm getting 50+ MPG consistently. Very quiet, good in rain, even OK in snow.
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Old October 23rd, 2019, 09:22   #29
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Thx for the FYI advice.

Whatever I buy I intend to tryout a tire which is a designed (Low Roll Resistance) one.
If anybody else has good experience with some of the following please let me know.
Please see attached.


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Old October 23rd, 2019, 10:44   #30
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When OH said Jetta Hybrid wheels, I was thinking of these -

17" Buenos Aires is what they are. 205/50R17 I think was the size.

Low rolling resistance tires, I think(they usually have Conti, so maybe not?)

Jason
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