Upgrade guide for rb25det

[drift freaq]

It depends on how much power you want. People suggest Greddy Intakes but the truth is you can run a stock intake with higher hp no problem. There are lots of guys in Australia doing it. Plus the Greddy intake actually does not do much in the HP department what it does do is clean up the the overall setup looks and piping wise. Also do not put a Q45 maf on unless your going with a decently larger turbo,even if you do the Greddy intake mani. Reason being is you sacrifice a bit of low end torque to the larger throttle body which means your bottom end response is not quite as peppy. Now if you go larger turbo that becomes somewhat of a non issue.
Now you have to ask yourself, how much boost am I am going for? How big of a turbo do I want? what kind of hp do I want.
A PowerFC is nice because its pretty much a bolt on power upgrade and gives you a lot of tuneability. If you want a PowerFC I suggest looking for one now though as Apexi has discontinued them for RB25DET's series I and II.
I went with a HKS GT2530 Turbo which was actually sold setup to bolt on our cars. I got a deal and to say honestly its a pretty kick ass mid level turbo. Good for 370- 375 hp at around 1.2 bar its rated lower but HKS only rates their turbos at 1 bar it was rated at 320 at 1 bar. Now if you do go with this turbo or larger, than you will need Injectors and a MAF for higher boost, fuel and air flow. I can run this turbo at around .9 bar on the stock injectors and maf and I am running close to 90% duty cycle. It spools like no tomorrow though. Now 550 injectors are the the minimum size I would start with which will give you headroom. Though if you plan on going much larger turbo wise or upwards of 400-450 hp than you might want to put in 750's. MAF pretty much is a Z32 should satisfy your needs. Other stuff is up to you. I.E. Tomei PonCams and gears. stronger head gasket etc..
Its all dependant on what your after HP wise.