Just got this 95 trans am on the road after doing some work to it and it is getting 10mpg without driving like a madman. Unfortunately the previous owner was not a mechanic so I do not have full specs on the engine. All I know is the LT1 was rebuilt to handle the blower, cam is larger than stock (very slight lope), 30lb fuel injectors, adjustable fuel pressure reg (currently at 50psi with vac hooked up) BBK throttle body, and a powerdyne 6psi supercharger. There is an autometer air/fuel mixture guage but is pretty much a light show. Although it is normally on the stoich or lean side the car must be running pig rich to get this kind of milage. PCM is stock, car pulls well to 5500 with no issues other than the gas consumption. Would lowering the fuel pressure some help or should I leave it at 50psi for the blower? Would getting the PCM programmed for the 30 pound injectors help? I do not have any tuning software or datalog software, before getting a new PCM (If needed) should I use something to check how the mixture is? I would think I could get at least 15mpg with this setup. Any advice would be helpful, I really dont want to buy a new PCM if it wont help since the car does run well other than the fuel milage. Thanks!

 

This would be a good post for LT1/LT4 Engine Tech, or for Forced Induction...... not Advanced Tech.

I'll move it to Forced Induction.... if you want it on LT1/LT4 Engine Tech, copy and paste, deleting the post on FI.

 

get it programmed you got like 36lb injects in there i bet and does it smell like gas.. i bet if u WOT u will make some cool fireballs stop driving it right now!! your plugs are probably almost fouled i got my car earlier this month off ebay with the mods below UNTUNED

 

they are Accel injectors, and supposedly 30lb, I will see if I can see a PN on them. Doesnt really smell like gas, but I am just wondering if the PCM needs to be programmed for them and the 58mm throttle body. The car really runs well, just seems to be using more gas then I think it should. I just wondered if the PCM tables should cycle the injectors at a lower flow percentage since they are larger than stock.