I'm going through my 87TII and I had some fears that I might be screwing it up. I've removed bac, air supply valve, air pump and control valve, omp, egr, I had my injectors flowed and cleaned, tb mod, tid mod, high flow exhaust. I'm building an fcd and my injectors flow avg 559cc/53lbhr. Will that be enough flow for the mods? A friend has 3 720cc injectors he'll sell me, Ithought that I might need to run them in secondaries? Also I heard that I should leave out the mixing cups on the secondaries? AM I going too far on a stock ecu??????? My plan is a haltech so I don't want alot of piggyback stuff. My main concern is that when I get it running it will be too lean and blow.
any advise and comments welcome, greg

 

Bigger injectors arent worth messing with until you get a way to control them.. otherwise your gonna be blowing alot of black smoke and making people laugh at you

Might just have to use a piggyback for now..

 

i have a stock ECU right now and have 720cc secondary injectors. I find no problem, just running really rich. I pop and shoot flames all the time

Good luck with it.


-Marshall

 

The missing part of your plan is the fuel pump! The stock injectors are big enough to flow enough fuel for nearly 300hp, but the stock fuel pump can't maintain the flow and pressure required, which causes the lean-outs people usually blame on the injectors. Replace it with a Walbro or similar.
You'll also need to port the wastegate, as a full exhaust and intake will cause dangerous overboost. If you can get one, a S5 turbo is much better than the S4 in this regard.

 

I priced a s5 turbo for $300- vis inspect only and s5 manifold $100. is that too much????????