Will my computer reject boost?

[3100rettaracer]

i have a 95 3100 v6 beretta. i plan on turboing it. i would like to know if my compter will work with boost. if not what do i do!!!

[SappySE107]

You can either go aftermarket ECM, get a computer add on that adjusts the fuel pressure regulator according to boost, or learn how to program and use an older GM computer setup.

[3100rettaracer]

ok what kind of ECU would you suggest??

[SappySE107]

the TGP computer would control boost, but you would need diacom, an ALDL cable, an eeprom writer, and gmpcm to edit the chip code. That and wiring for MPFI, and the stock computer setup for outputs on the transmissoin only.

[3100rettaracer]

umm sounds $pendy.an it will be a stick before the turbo goes in.
any other options?

[SappySE107]

I think your car is MAP, which means there is no way for the stock ECM to see boost without a reprogram to see higher MAP values using a 2 bar MAP.

[3100rettaracer]

who would you suggest for reprograming

[bszopi]

Fast Chip is the only one that might even consider a reprogram on that PCM, but I doubt he'd be willing to attempt to do what you want to do. You'd have to take the car there (Tulsa, OK), ready to be programmed so that he could put it on the dyno. Look to spend AT LEAST a full day there to get it tuned properly (if he could even do it). Normal custom dyno programs from him are $500, but I'm sure yours would be well over $800 with all the dyno time that would be needed.

[nocutt]

If I were you, I will just go ahead and get an aftermarket PCM...I don't know any person that can reprogram the OBD1.5/2 PCMs on the 3100, especially with boost! The other alternative is to go buy a blackbox...
Yes it is spendy, but consider that this is the one part on the system that you don't want to cheap out on!?!
Question? I thought all 3100s used MAF or MAP and MAF?

[bszopi]

All I have is MAP. MAFs weren't brought into the 3100s (L-bodies at least) until they went to OBD-2 in 96.

[3100rettaracer]

uhh whats this stuff gonna cost me?

[Cliff8928]

uhh whats this stuff gonna cost me?

If you are asking this, maybe you shouldn't be Turbocharging your car..


Cliff Scott
89 BerettaGT
89 Volvo740

[3100rettaracer]

how bout no. i have a turbo, and an intercooler and a custom y pipe (my own design) i'm not stopping. how bout you just help me out and tell me how much the computer stuff is gonna cost me

[bszopi]

Standalone ECMs run anywhere from $800 to $2500+. And they basically require a dyno to tune them.

[Mechanic]

If you are using a 5-spd manual trans then there is simply no contest. You swap in either a 1227730 or 1227727 PCM, burn the chip with some Turbo Grand Prix $8F code adjusted for injector flow rate, trans, etc., and your done...

You have obviously invested a considerable amount of $$ already. A proper forced induction engine management system is a critical factor if you want a well performing engine, and there is really NO equivalent to a well tuned OEM forced induction engine management system. The expense of such a system is negligible, and most of that is time rather than money.

Your abilities can have a direct impact on the cost involved to achieve what I have suggested. For example, if you can solder a component board, you can make your own DIY eprom burner
If not, then you will probably be limited to a commercial eprom burner or emulator package, but even these are available for less than $200, and you can sell them after you are satisfied with your code results.

The significant cost involved is time spent obtaining the basic knowledge required for a PCM swap and code burning, but a turbo retrofit requires a certain amount of self learning attitude anyway, so you are probably already in that type of mindset. You may want to check the links section of the GMPCM website, a good resource for this type of information.

You can find a 7730 / 7727 with harness at any salvage yard or pick-n-pull. Typical prices would be ~$35 for the PCM, and $20-30 for the harness. Since older V6 Beretta's were equipped with the 7730, a PCM swap such as this is pretty straightforward.

Aftermarket systems capable of controlling a DIS ignition under boost are extremely expensive, as this requires something that is at least an equivalent to a TEC-II, with an entry-level cost close to $2000.