Paulc19

Basically as the title says. I recently swapped out my s4 NA 13b with what looks to be an s5 13bt (although I'm not sure because the car it came out of was an 87 s4 but the housings look to be s5, so idk what to think).
The motor itself is in pretty decent shape, probably less than 5k miles on it and decent compression on both rotors and on all sides.
I'm running a recently installed Micro tech LT-9C, 4 750cc injectors and a fuel pump from an FD.
Im running a racing beat exhaust that i bought off a buddy of mine. He did remove the per-silencer, so im not sure if that would negatively impact the performance, but I don't think it should be a problem. correct me if I'm wrong though.
My main concern is the turbocharger, which is stock and from what I've learned, its only rated for up to 12psi (with the stock boost running around 7-8psi). However the turbo overall is in great shape. Im also running the stock TMIC
I'm planning to get the himini racing turbo kit in the future for more serious power upgrade, but for now, how much should i expect to get out of this setup, while also keeping it decently reliable?
Any thoughts are greatly appreciated as well as where i should go from here regarding the engine
Edit: something else I forgot to mention, Im currently running a Koyorad aluminum racing radiator, and have never had a heat issue since I installed it, and have never had a heat issue since on the stock ecu

j9fd3s

iTrader: (3)

the amount of HP really depends on the details.

you have enough fuel for about 260-270rwhp

you have enough turbo for about 220-240rwhp

the stock turbo is perfectly fine it is just small.

Paulc19

When you say these numbers, do you mean horsepower reliably or is this the absolute max? also I heard from a few people that if you boost past 12psi your just blowing hot air into the engine, which would cause the engine to go, i assume that holds true.

j9fd3s

iTrader: (3)

i meant reliable, although the more power you make, the more that little details matter.

more boost = more heat...

Aaron Cake

iTrader: (1)

Also with the TMIC and the stock turbo at around 12-14PSI, your IATs are going to be through the roof.

Paulc19

My initial idea for power would have been for around 300RWHP, and that would definitely need a FMIC and a turbo and fuel upgrade, so I think I'm going to keep the tune stock until I can route the intercooler and get the upgrades i need.

Paulc19

Thanks for the advice. When it comes to fuel for future reference, would I need to upgrade the pump or the injectors first?

j9fd3s

iTrader: (3)

both, a stock FD is 550x2 and 850x2 which is about the same as 4x750's...

if it was mine i would get the tune right on the lowest boost you can get and then raise the boost slowly until you run out of injector, or the intake air temps get too crazy.

Paulc19

Ok, i get what your saying.

But regarding your second comment: Wouldn't that wear out the injectors though, tuning the motor just before the point where it cant put any more fuel in because the injectors are too small? or am i mistaken?

DC5Daniel

iTrader: (10)

He doesn't mean running 100% duty cycle, which would result in catastrophic damage. He's suggesting to get to the limit, which is typically considered 80% duty cycle.

Paulc19

ah, ok that makes more sense

SirCygnus

iTrader: (1)

yeah never go above 80% duty cycle. 250 wheel HP will 100% be pushing your limits. if you are looking for 300 to 350 wheel hp, a bnr stage 4 and some beefier injectors, a full 3 inch exhaust, and a front mount will do you well.

Paulc19

So If I want to reach that 300hp mark reliability, where should I go from here?
Ive heard BNR are great turbo upgrades, That, and a front mounted intercooler. after, what size injectors and fuel pump should I be looking for. Recommended brands and sizes?
Edit: as im going back into my purchase history the fuel pump I purchased is a Walbro High Flow Fuel Pump w/ 255LPH max fuel flow

j9fd3s

iTrader: (3)

you should do some searching around here, i think the walbro should be fine for 300-350hp, and then you'd just need larger injectors. HKS, SARD, Injector dynamics, Deatchworks, all sell bigger ones. walbro and deatchworks sell bigger pumps, if its needed

and yes, i'd turn up the boost until you're hitting 80% injector duty, or whatever you're comfortable with.

BNR is nice because its a bolt on, everything else you need a manifold, downpipe and all that stuff. kind of up to you, its your car.