Magown

Gang, I have spent a few hours tweaking my '86 951's fuel injection with the ad of the techedge wideband 02.

When I picked this car up in August it had a hard time getting more then 18 mpg.

Looks like my efforts have paid off. I've got the a/f's looking pretty good.

Today I drove 270 miles in 3 hours, 20 mins During that time I did my best to conserve as much fuel as possible and stay out of the boost. I filled up when I left point A and also filled up when I arrived at point B. Curse control was not used.

The result is 25.6 mpg.

Friday the car saw 280 unconservative miles. There was a lot of traffic and lost of chances to get in the boost. There was even a few cars who dared to step up to the plate.

The result 22.1 mpg.

There may still be a little more economy left on the table. I wouldn't surprise me if this car could hit the 30's, it may require my mother behind the wheel as she sets the cruse to 3 mph above the limit listens to the radio.

Ben Z.

With ape II chips and an LBE, 29 mpg on all highway. In town is generally around 20, sometimes lower.

awilson40

Stock chips, just the Reliaboost kicking me up to 13psi.
27 interstate
19 all city

streckfu's

APE MAF and chips, LBE, test pipe; 28-31 mpg.

porshhhh951

damn.....maybe i need to retune my air/fuel
what kinds of a/r numbers did you guys put out on the dyno???

Ahmet

I usually get about 26mpg if fairly conservative on the highway. Car's got open exhaust, 3bar fuel pressure, stock k26/6, ~18psi max boost.
Ahmet

RajDatta

I get 400 miles on a full tank before the reserve light but that is cause I have not tuned it for bigger 52# injectors yet. I turned my FP down enough and it pulls clean but that is the best I can do being conservative. Probably, another 75-100mph left in it when tuned.

Perry 951

I got pretty damn close to 30mpg on a 1300 mile trip, all highway. This is with #55's and a crusing A/F of 15.5.

Magown

Wow, maybe I need to tweak it a little bit more. I'm currently shooting for a cruising a/f 14.7 maybe I should lean it out a little bit more.

I have a vacuum leak that I haven't been able to trace, any idea what a vaccum leak does to a map based system

Jaak Lepson

I get 36 mpg (Canadian Gallon) on the highway with an occasional tickle with the happy foot ... 23 to 26 in the city!

Jaak Lepson

Sami951

My purely theoretical guess is that a vacuum leak wouldn't really cause any issues on a MAP system. You're missing some performance, but the A/F ratios shouldn't be affected... the air is measured at the intake manifold, and that's pretty accurate even if something's leaking before it gets there.

I was able to drive back home with no particular issues when my IC pipe popped off during a spirited back-road run

MPG wise, no clue - haven't had enough $$ to buy a full tank of gas lately.

TurboTommy

I like to know how you guys have the discipline for the long drive for the mpg test and not have the urge for a good thrashing. The first time I would have a vette or a modded ricer wanting a go, my mpg test would go all to hell.

Another thing: if you still have the DME ( maybe with chips, however), and the O2 sensor connected, I don't know how you're able to tune leaner than stoichiometric. I always wondered about that. How does any piggy back system override the DME/O2 sensor combo's desire to keep it around stoichiometric?

kevin Dubois

i drove to philly from west michigan at 9 lb of boost. in penn i was driving about 90-100 all the way across the state and was getting 30 MPG. on the way back i did just as well.

Cyrus951

Chipped 89 951 gets about 25 highway, and 18 city.
91 octane.

ewainwright

Its the fault of my right foot. 17mpg and a toasted clutch (145K) Got my money's worth