Well here I am again. I am at LONG at last building an engine that I began planning sense I discovered this site back in the late 90s.

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 1990 Caddy 350 roller cam that does torque peek at 2200RPMs. I believe advanceing that 4 degrees should move the torque peek down to 2000.

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

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

So after building this brand new engine I read somewhere a TBI PCM can be made to handle the 3 extra injectors of a TPI per bank/output.

I want to do this as the current set is a running one and I feel I would be better off firing up a new engine on a known working FI system than try it on a new dual PCM install with all the things that can go wrong.

Then once broken in I can then tackle rigging in the true TPI PCM and all.

So can someone direct me to any threads covering this??

Thanks.

Rich

 

Hmmn, what's the impedence of a TBI injector? Then equate that to the 4 TPI injectors in parallel.

IIRC, isn't there a sticky thread about repinning a TBI to TPI?

Let me look.

 

Here ya go:

https://www.thirdgen.org/forums/tpi/...d-density.html

 

Thanks.

Rich

 

Close, but I already have a fully working system, that thread was a thread on using a 7730, in place of a 12277165.

I need to know how to add the three more (or four total) of a TPI intake to a standard TBI system in place of its two big injectors, making the system a true Batch fired system. Currently my Van’s PCM is a 16186695.

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 will need a eprom for a MAP system?

As I see it I need two things: Some kind of a stronger transistor interface adaptor between the Vans current PCM and the four injectors per injector outputs to handle the load, or replacement transistors and a programed eprom to run the TPI injectors. I believe the injector’s duty cycle will be different to the TBI.

And one last hope is that all Chevy OBDI PCMS have the Lean Burn Cruse of Highway Mode in them so I can turn it on as was in the 165 PCMs.

Any chance of finding a couple threads covering those changes?

Thanks again for all the help here.

Rich

 

Invest in a ebl with the port mod.

 

First what is a ebl with the port mod??Latest info on this thread:

The best advice I have got has been that as I am looking for as much torque at 1500 to 2500RPMs, especially at 1500, a TPI is tuned to product max torque at 2800RPMs and NOT 1500/200, for that I have been told to run a Eldeblock Performer intake, with a TBI adapter and to stick with my stock 93 Van PCM.

And as I am running a power cam that will be lowered by Roads Roller Lifters, this combo will give me a great power range from 1500RPM to my engines max of 5500RPMs.
Rich

 

I have a 1989 K1500 that used to have a 7747 ecu, originally I had the Edelbrocks MPFI conversion- which I should have kept and replaced their pos chip with the ebl conversion which is pretty much pnp. I've added WB O2, fuel pressure transducer, IAT. All off the oem TBI harness and added wiring. I believe there was driver issues going from TBI to MPFI but I've never had a problem with ebl. There is also a later hacked GM truck TBI ecu that can do all of this and run a 4L60E. But I value a plug in ecu. Look up FAST355- he's done alot in the name of towing. Wet manifolds have their own plus's.

https://www.dynamicefi.com/EBL_Flash.php

 

"I have a 1989 K1500 that used to have a 7747 ecu, originally I had the Edelbrocks MPFI conversion- which I should have kept and replaced their pos chip with the ebl conversion which is pretty much pnp. I've added WB O2, fuel pressure transducer, IAT. All off the oem TBI harness and added wiring. I believe there was driver issues going from TBI to MPFI but I've never had a problem with ebl. There is also a later hacked GM truck TBI ecu that can do all of this and run a 4L60E. But I value a plug in ecu. Look up FAST355- he's done alot in the name of towing. Wet manifolds have their own plus's.

As I am aware that vapor is the only thing that burns, allow more time for vaporization might work better that port injection: considering how it was reported that the batch or simply all at once, fuel injection with that the sitting of fuel on top of a hot intake valve helps vapor and power and MPG... and that a tighter injection system will always be limited to how much vapor can be produced within the combustion chamber and that direct injection only insures of that limit, then a wet intake just might given the right mix MIGHT burn leaner and make better MPG that the other systems.

That is something I will be testing.

I am aware of Dunamic EFI but I am told I can do almost all of that without spending $300.00 to $500.00.
Rich

 

GearheadEFI, seek out daveW, he's well versed and can set you up w factory.