List your performance mods and MPG

[einstein57]

At the the car meet I was talking to blue apple soda who said his turbo car was getting 11mpg. With the price of premium encroaching $5 a gallon in so cal the thought of spending hard earned money on performance upgrades with a potential harsh effect on fuel economy seems like a haunting dilemma. Lets see what kind of mods are yielding what MPGs.

And don't post what your OBC tells you cause they lie.

I'll start.

87 325is manual tans with 3:73 LSD, 300k miles
173 stock DME
M30 AFM with cone filter
Bosch (Ford refurbs) 19lbs injectors.
8mm plug wires
Magnaflow cat
IE exhaust
23mpg combined average.

[nando]

11mpg on a turbo M20? wow that is horrible. He must have the low load areas tuned pig rich.. FMU or standalone? I'm betting FMU.

anyway, the only mods that count:

M20B28
4.10(s)
42# injectors
crap headers, stock cat, Supersprint catback
MS2/e running wasted spark
stock airbox/Mann filter

I haven't tuned for economy at all and I get about 18-19 on average. with motronic, I was getting.. 18-19 on average. lol. But it was quite a bit slower.

[E30ownerwithanopinion]

Electric Turbo
LED washer nozzles
teddy bear rims
curb feelers
20% tint all round
high end Coby stereo


27 mpg high way.

[KenC]

290k M42 (not all that efficient after a recent wash-down issue)
4.10 LSD
Mark D 92 Octane chip

27-29mpg Combined

[bimmer_E30]

M20B27 , chip ,muffler. and i run 91 octane.
i get about 11.4/l per 100kms.

[backtrail69]

Turbo M20B28
Holset HX35
Volk Adapter
MSnS w/ Waste Spark
60# injectors
3.73 rear end

I am getting about 20 mpg mixed with lots of romping on it and about 25 freeway.

Stock ETA
Dinan Chip (came with car, I wouldn't pay money for that piece of shit)
2.93 LSD

I have a rubbing caliper on one side that is dropping mpg by about 2-3 mpg that I need to fix. I used to get 25 city and 29 freeway.

[e30bmlover]

87' m20b25( rebuilt ) with a k+n panel filter, running a 4.1 open diff and im getting 240-250 miles to a tank

[einstein57]

Turbo M20B28
Holset HX35
Volk Adapter
MSnS w/ Waste Spark
60# injectors
3.73 rear end

I am getting about 20 mpg mixed with lots of romping on it and about 25 freeway.

Stock ETA
Dinan Chip (came with car, I wouldn't pay money for that piece of shit)
2.93 LSD

I have a rubbing caliper on one side that is dropping mpg by about 2-3 mpg that I need to fix. I used to get 25 city and 29 freeway.

Sweet. So there is hope for my turbo stroker project.

[nando]

Sweet. So there is hope for my turbo stroker project.

your friend is probably getting poor mileage from that fuel-only setup, the timing is way retarded and it has to run super rich to compensate.

[cheades]

Nando, you are running 42# injectors???

S50
24# injectors
3.5" maf
JimC chip
3.23 lsd
10-13mpg on the track, 25-28 freeway

[nando]

yeah, they only hit a max of 40% dc though. 21-24# would perfectly suit my current power level but I got a good deal and they were barely used - and there's lots of room for future growth. :)

[dandingo]

Mine's mostly stock with a Mark D chip and suspension. I just did an entire tune up and got 28.5 mpg from L.A. to Palm Springs and back this last weekend, between 70 and 85 mph. I also had the a/c on about 50% of the time. It was about 90% freeway and 10% city. I get about 18 in the city and 20 if I drive like a 90 year old.

[DarkWing6]

No wheels or driveshaft.....0mpg :(

[BUDNUNTA]

1991 318is
180k
Mark D 93 chip
K&N Drop-In
Metric machanics 2" header back exhaust

I was getting between 28-30 but Ive managed 32 on the highway.
I just got all new injectors, we'll se if that makes a difference.




Hunter

[Jon325i]

If your idea of mods includes an aftermarket catalyst, then count my car in. Otherwise, all stock M20B25, 3.73LSD, 15x7 wheels w/ 225/50s, B-Sports and IE Stg3 springs. With the tank topped to the neck I've returned 365-370 miles (mostly highway) on the trip meter which is around 25mpg. Maybe a tad better if I grandma the throttle.

Jon