Haltec ECM tuning for more FE

[91CavGT]

Last weekend I picked up a new project car. A 1991 Chevy Cavalier station wagon. It's got a lot of performance modifications on it that would normally hurt FE, but it does have a Haltec full stand alone ECU. So, I'd like to start doing some programming changes to it to increase FE. I've got a good understanding on engines but I don't know where to start on tuning this beast. A friend of mine has a more radical engine in his Cavalier and has gotten 28 mpg on the highway with a couple of blasts to 140 mph and cruising at 75 to 80 mph.


A short list of the engine modifications are as follows;

1990 Pontiac Grand Prix Turbo 3.1L rotating assembly bored 0.030" over
custom Crower camshaft (2,000 - 6,000 rpm power band)
30 lb/hr injectors (I know I can decrease pulsewidth on these down to 0.3 or 0.4 milliseconds)
Garret T3/T04E turbocharger
Haltec E6GMX


http://www.cardomain.com/ride/783538

[bowtieguy]

i had a '91 cavalier wagon RS a few years ago. really quick for an AT--camaro engine. also, it was very dependable and versatile. open the hatch, lay down the back seat for a make-shift truck bed.

wish i woulda kept it. maybe put in a 4 banger w/ manual tranny.

[GasSavers_Pete]

Where to start is to find out where it is now.

Can you get a reading of the Haltech settings and the camshaft numbers?
These two will determine pretty much everything about the engine from a FE and / or performance standpoint.

Pete.

[91CavGT]

Originally Posted by Pete

Where to start is to find out where it is now.

Can you get a reading of the Haltech settings and the camshaft numbers?
These two will determine pretty much everything about the engine from a FE and / or performance standpoint.

Pete.

I've got the build sheet for the camshaft so I've got all the specs for it. As for the program that it is currently running on the Haltec, I'm working on that. I've got the software and the cable, I just need to get an old lap top that I've got up and running again so I can use it to get that data.