Quote:
Originally Posted by Frankencar
Sooo - I have had this 1991 VW GTI for almost 3 years now - and for the first 2 it was getting aobut 21MPG. In August of last year we fixed that with an AHU TDI:
I'ts mostly modded to go fast so I was shocked at how good the MPG was once I started driving it. I'm really hooked now! I even drove a whole 1100 miles as carefully as possible just to see how it does and was able to get it up to 78MPG!  though the lifetime average is only about 60MPG.
Since the swap I have added the following eco-mods:
1: High temop thermostat (92 rather than 87 degrees)
2: Taller 5th gear (.622 was .756)
My question now is - what else can I do without getting really crazy? I want to keep it looking as stock as possible. Here are my thoughts...
1: Maybe a belly pan of sorts
2: LRR Tires (already in the plans when it gets 5-lug and Porsche brakes)
3: Some sort of tasteful grill block?
4: Maybe eventually go 6-speed with a .59 5th gear
This site has been a great resource so far - and I think the best info for future MPG gains will come from all you you MPG gurus.  |
I am envious. I had an 84 GLI, and later a 91 Jetta. Both would have been good diesel candidates. The 91 had PS that I deleted. It'd get low 30s for mpg... I am tempted to find a similar car and engine and try this myself.
Besides the grill block and belly pan, you could make some small fairings to put in front of each wheel/tire to guide the airflow around them. Maybe a rear wheel skirt too...