how much rwhp can each of these components support up to within a margin of safety? im not talking about how much hp it can make for 2 dyno runs and then blowin the motor, but how much "safe" rwhp can it support.

-stock TMIC
-S4 turbo ECU
-S4 turbo fuel system (injectors, fuel pump, etc)
-S4 stock turbo (and also what psi before it becomes ineffcient)
-S5 stock turbo (and also what psi before it becomes ineffcient)

im a n00b, came from a world of piston engines. everyones gotta start somewhere right?

 

I'd say 210whp limited mostly by the fuel system. You are limited to the fuel cut boost level unless you get an FCD and going past that without some fuel mods is not really a good idea. :/

 

The previous owner of my car dynoed the car with the stock S4 turbo, stock TMIC, Fuel cut defender, exhaust, stock fuel system, and an SAFC. He got 215 RWHP on 8lbs of boost.

The car currently has 167,000miles on it and is still running strong (knocks on wood). Since he dynoed it, I have put on an S5 turbo and manifold and installed an EBC. I usually run 6-8psi around town, and up it to 8-10 for those rare race/auto-x occasions.

Don't know if that helps, but it's one example. (215 reliable RWHP, probably more HP now).

 

i've heard anywhere from 12 to 14psi is the stopping point for the turbo (not efficiant)
deffinatley what rx7guy said is right, that is your main limmitation. If you where to get at least a larger fuel pump you would be good until you upgraded your turbo. The ecu is a good question but hopefully I will be making about 310-320rwhp with my setup on stock ecu with rtek 1.7 chip and safc.

 

i've seen with a walbro, 269rwhp @ 12psi

 

Why are you running an S-AFC with the R-Tek 1.7? Are you running larger than 720cc secondaries?

-Joe

 

nah just when I do get a wideband I will fine tune with it. I'm pretty pissed I don't have a wideband now but my money and my honey won't allow it also another reason I want an safc is because i don't think I've ever heard of the rtek 1.7 and an upgraded turbo so it may run a little lean because its not a stock turbo. Who knows. Short answer for safty.

 

thanks guys for the replies...i have no intentions on keeping the FC stock. i was just curious to know the limitations of the components. i have a to4e 57 trim going in so im sure i have to upgrade the fuel system and go with a front mount ic.

 

With stock fuel injectors and a walrbo you saw 269rwhp?
That dyno doesn't happen to be posted on the net does it?

The reason I ask is my t2 with stock cleaned injectors/walrbo @ 11psi maxxed out the fuel system, car hit a brick wall, injectors stock open, haltech said 120% duty cycle...

 

120%? That's not possible...

But since he only mentioned the Walbro, I wouldn't doubt that car had bigger injectors. And as we all know, the proper 255lph Walbro can flow enough fuel to support up to 400hp.

 

Its not possible, that what was needed out of those injectors.

 

yea it was on stock inj. and a s5 turbo, i don't have a dyno sheet though (it was'nt my car)

 

I believe it, but I don't think the turbo or the engine will last long like that.

-Joe

 

That would put the injectors past 95% duty cycle. In any case, I don't doubt it happened with a stand-alone EMS, since you never mentioned whether the car is still running fine and the injectors are still fine. With the stock ECU, I'm unsure, since I thought I remembered that the stock ECU will only drive the primary injectors up to ~60%-ish max duty cycle... which would mean not enough fuel.

 

Was this on stock ecu too?

 

Not true. Stock ECU doesn't care about duty cycle.

 

Eh? Thats not true from what I've read. The ECU has a cap off to the duty cycle, though I believe its closer to 80%.

-Joe

 

yes it does, thats why on the rtek chip they increase it by 5 percent.

 

Myth, the stock ECU will drive them without limitations...the limit is the size, not DC.

 

I'm confused then why does the rtek increase it by 5%?