91chevz71

I'm wondering about swapping a TPI setup from a 90-92 350 onto my truck. Which system is the best? How do I program the EBL for port fuel? I am looking for more torque. It looks pretty similar in terms of the harness and stuff like IAC, TPS, etc so it can't be that hard. New fuel lines, pump.
Anyway, what changes need to be made to the EBL?

THanks,
Mike

Fast355

iTrader: (2)

The stock runner TPI setup IS NOT what you want, if you want torque. A good dual plane manifold will out-torque the TPI setup down low.

I would look into a standard L31 Vortec truck intake manifold. It will not fall off up top as fast and will out-torque the TPI intake down low. The TPI setup will out-torque the L31 and dual plane manifold between 3,200 and 3,800 though.

The L31 Vortec setup is much more affordible than the TPI setup would be. Not only would you have to get the runners, the plenum, the fuel rails, injectors, etc, you would have to buy the $370.00 vortec specific base for it.

91chevz71

How would I work that into the EBL platform? What about the marine intake?
Not too ask too many q's...
so, I would need the upper/lower intakes, inj's, new sensors, IAC, I need to do some research on that intake

Rbob- what do I have to do to make the EBL run this setup? (OBS 96-98 vortec induction w/ EBL)

V8Astro Captain

iTrader: (1)

My question is, if you run the TPI setup where would you get injectors? The smallest P&H port style injectors I've found are 55 lb/hr.

Then I guess you would reduce all the AE and divide the BPC tables by 4...? I suppose...

91chevz71

why not? what about using the standard 24 lb/hr 350 inj's? I would re-wire the harness for the inj's

dimented24x7

iTrader: (2)

EBL can be made to drive saturated injectors. Speak to RBob. The later TBI PCMs can also drive the injectors in the same manner as the TPI ECMs with some mods and a change to the memcal, or a direct change to the code to tell the computer when it needs to initiate the injector firings in the DRP interrupt routine. It would be at most a simple patch. The ideal vortec setup to have for this would be the one thats retrofitted with the standard type injectors rather then the troublesome poppets. As long as the resistance is high enough, each set of 4 can be wired in place of one of the TBI injectors on EBL or a PCM.

I toyed with the idea of MPFI, but I'll probably stick with TBI for now. The vortec intake is an interesting idea. Later down the road, I may try it for yucks to see how it compares to TBI with a hi-po manifold.

junkcltr

iTrader: (1)

You need to change two resistors in the later TBI PCM to run 8 P&H injectors. More heatsink and a better driver would be nice also. The MEMCAL change is to change from alternate fire to double fire batch.

dimented24x7

iTrader: (2)

The older ECMs have dual output pins for the switched side of each injector. Are these actually wired into the drivers to handle extra current capacity? If thats so, then it would increase the ammount of current you could pull through the circuit. The later TBI stuff just has a single pin for each injector in the harness.

91chevz71

cool. I'll shoot Rbob a message about it.
So many combos...not enough cash
thanks guys

junkcltr

iTrader: (1)

The 427 ECM cost $40 with a 5.7 MEMCAL in it. The connectors are $25 from roses&wrenches.com. You can use your existing PROM burning equip.
I did pick up one 427 ECM with connectors and a 7.4 MEMCAL for $40 from one yard. The PROM size is 64K which can hold more refined algorithms over the old tiny 4K chips. Overall, you can do it fairly low cost. Dimented24x7 has a great hac that he has posted at TGO.