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Username Post: Camaro TPI into 93 Van        (Topic#360305)
Posts: 41

Age: 73
Loc: Phoenix AZ
Reg: 09-08-09
03-28-20 12:57 PM - Post#2789649    

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 spair.

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 eat 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 PCM system in place of its 2 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.



Senior Member
Posts: 532

Loc: CA
Reg: 07-18-00
03-29-20 09:48 AM - Post#2789719    
    In response to racprops

It appears you need something like an encyclopedia.

Reading forum posts can be a bit tricky, in that information is spotty, not compiled in an easy to read format, etc. Not to mention some people have little patience in teaching others. However, if you haven't found them already, I can point you to these forums:

The easiest way for you might be a stand alone system that interfaces with TPI.

I often wondered about dropping in a stock 5.7 TPI into my Safari.

Good luck, and post status reports on the project.

1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari

Posts: 41

Age: 73
Loc: Phoenix AZ
Reg: 09-08-09
05-21-20 12:38 PM - Post#2794405    
    In response to paulo57509

Thanks. Due to too many delays I am forced to use the stock TBI systems.

Which lead to this question I am being told I should run a dual plane intake manifold under my Throttle Body Injectors.

I am told that such a intake will improve my engines torque at lower RPMS like 1500 to 2500.

So what has any of your guys found out: Is this a good or bad idea??




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