Thread: passing the 400whp mark help

ok so i just made my engine forged low compression i have a garret 60 trim i have a couple of questions. what limit does the stock ecu hold (whp wise) i have apexi safc2 installed. i heard it was 450 or so. if it is true what injectors to get becuz i currently have 440 and its not enough because i plan to go on e85. if 450whp is the limit what do i need to go further? thx a lot and sorry for too many questions at once

As soon as you figure out what your going to do, I would like first dibs on your 440 injectors. Thanks man

what is your offer on them?

Just go straight to 1000cc. Ecu can go as far as you can, so far 500whp has been done

i have the stock ecu with the apexi safc2 , but it is said that once you go over the 650cc injectors the piggybag will not be enough

If you are 04-06 do UpRev tuning, much better, more accurate. Yes you are right that the SAFC2 can only handle ~650c injectors.

I had the 440s on my car right after I turboed it and I couldnt even hit 10lbs of boost on a 50 trim wih e85 and not go lean. Now I have 577cc srt4 injectors and cant even hit 10lbs with my gt30r turbo and e85. Im putting some 1000cc on today and tuning with a safc neo. I'll let you know how it goes. I have a walbro 255hp and return style fuel system and running 70lbs of fuel pressure low compression pistons as well.

thx i apreciate let me know your results =D

Originally Posted by joegem5

If you are 04-06 do UpRev tuning, much better, more accurate. Yes you are right that the SAFC2 can only handle ~650c injectors.

i am a 03 spec v, do i need to put aem ecu or something. the deal is that i want to make 400 whp flat. at what psi and fuel injector size and or computer will i achieve that

You can hit 400whp with just an SAFC. I think 630cc injectors won't max out at that hp level and should still be tuneable with a piggyback.

Originally Posted by MisterNuts

You can hit 400whp with just an SAFC. I think 630cc injectors won't max out at that hp level and should still be tuneable with a piggyback.

i think they'll be maxed if he's gonna run e85


a local spec is running 850's with just and afc on e85. he made 460's @ 16-17psi with a gt30

^^^ You're right, I missed the e85 part.

Originally Posted by White_Spec-V

i think they'll be maxed if he's gonna run e85


a local spec is running 850's with just and afc on e85. he made 460's @ 16-17psi with a gt30

let me get this straight.... my perspective is that e85 will max power output being able to have lower boost.. let me explain myself for example(not actual) i could do 400whp at 20 psi on 93 octane but i can also do 400wh on e85 and like 17 or 18 psi? is that right?

Originally Posted by Manny03specv

let me get this straight.... my perspective is that e85 will max power output being able to have lower boost.. let me explain myself for example(not actual) i could do 400whp at 20 psi on 93 octane but i can also do 400wh on e85 and like 17 or 18 psi? is that right?

theoretically, yes. E85 has a higher octane content then regular pump gas.. with the right tune and afr's, e85 could drastically raise your power output

ok thx a lot so to make 400 whp what injector size to get with e85? i have a garret 60-1, low compression forged engine

imo, something in the 800's would be fine

Some good info on injectors in general, and some you can look into getting.
Injectors - Very important

a set of 4 1000cc injectors for $340: plug and play, pretty much made for the sentra specs.
2003 NISSAN SENTRA SE-R SPEC V, L4, 2.5L, QR25DE, GAS Fuel Injectors

thx sammy really helpful

Miles on the 440 injectors?

what kind of motor work have you done?? my downfall was the little air gap in between cylinders caused my sleeves to crack through. need to kinda fill those in or put sleeves in you motor