with a completely built bottom end, how much boost can i run, with a stock ecu? car is a 96 integ gsr.

 

Now, why would you want to use a stock ecu with a built bottom end?

 

i'm running out of money. until next xmas. i do have a apex Vafc. it ran safe and strong on 10 psi.

 

why does everyone wanna now "how much boost". your question should be "how much horsepower"?

18 lbs on a t4 sustains/makes way more power than a small t3/4 w/ 18 lbs.


using anything higher than 550cc injectors on a stock ecu is not recommended(with afc/fmu). that limits you to around 400 hsp to the wheels, give or take.

 

to make HP, i need to know how much boost i can run on a stock ecu.

 

The stock ecu cant read boost.

 

ok, so if i say you can run 1.5bar on a stock ecu and motor, how does that help you??

 

i do apoligize. my question should have stated. whats the biggest injector size, i can run with a stock ecu? after knowing this, i will need to ask " how much boost can i run on that injector size?"

 

440cc injectors are relatively easy to tune. the 550's will require the dyno without a doubt. we would still need to now what turbo your going to run to give you a boost level. also, the finer you tune the engine, the less boost you'll need to run to get a given amount of power. for instance....i may get 350hsp from a t3/4 @ 20lbs of boost. someone else may get 350 hsp from the same t3/4 @ 16lbs of boost. one motor is closer to destruction than the other.

 

i have 440cc injectors and can make about 22lbs of boost=434whp.

 

wish my car made 434 hp @ 22psi..

 

Just because a motor is able to push more power out of a lower boost level doesn't necessarily mean that it's closer to destruction than the other. As long as there's plenty of fuel and there's a conservative timing map it's perfectly safe. Different mods and configurations can affect the amount of hp as well.

-Mike

 

thanks turbotyper, thats what i was kinda wanting to here.