Here is what I am building, a low RPM 383, to have its torque peek at 2000 RPMs. It is for a custom 93 Chevy van and I will be doing things to get the engine cursing at 80MPH at 1700 RPMs. Either a add on second Over Drive, or 6L80 with a special rear end with a possi and 2:41 gears.

I am running the stock 193 heads, a stock 1990 Caddy 350 roller cam that does that.

And a stock 88 Corvette TPI with new 22LBS Injectors.

My aim is for the best POSSIBLE MPG in a big G20 Van.

I was going to run a MAF TPI system with the 1227165 PCM. In fact I got 4 of them, two with the VAT removed. And four MAFs.

But as I have learned the Lean Burn Cruse or highway Mode is in almost all PCMs, it just in some cases just needs to be turned on. So I do not need the 165 Old PCM.

SO at this time I am looking into using a factory TBI PCM to run my Van’s new engine with a TPI system.

This leads me to a number of questions I am hoping to find here:

I find that the 16186695 PCM in my 93 Van is a one year PCM, WHY?? I am betting it had problems. I replaced it once and carry a spare.

So is there a better PCM like a 94 or 95 that if not a direct replacement can be easy swap with a few repinings??

IF I can have my cake and eats it too I would like to hook up my current PCM as it was/is a known running system and then break in my newly rebuilt 383. Then I can do the replacement PCM etc.

So what I need to know is how to add the three more or four injectors total per output for a TPI intake to a standard TBI system in place of its big injectors, making the system a true Batch fired system.

And how to reprogram the Medcal (eprom) to run this 1993 OBDI PCM to run a TPI set of injectors.

Perhaps I can run an eprom for a 12277165 PCM? The only problem maybe that my 165s are all MAF systems?? So I could I use a eprom from a MAP system?

As I see it I need two things: Some kind of a stronger transistors or an interface adaptor between the Vans current PCM and the four injectors per injector outputs to handle the load, and a programed eprom to run the TPI injectors.

The only sensor that might be off is the TPI throttle Position Sensor, it might have a different value.

Thanks for any help anyone is willing to share.

Rich

 

This might do better in the Gen I or II forums. This is all LS engines.

 

Thanks, I am hunting info on many boards.

Rich

 

I would talk to the guys at Moates. I think they would be the best to talk to about this.

 

Try the 3rd gen web forum for this stuff.

 

It's not a 3rd gen engine, but a 1st gen.

 

They have lots of info on the TPI and TBI ecms.

 

GearheadEFI.com is a great source for OBD1 stuff.

 

Third Gen Camaro & Firebird Forum - all the TBI & TPI info you could ever want

Also on converting TBI to TPI
3rd Gen TBI to TPI

Another useful page on the Third Gen Forum
Tech Article List - lots of TBI & TPI info