RB25DET max boost?

[brnyrd]

how much boost can the RB25DET motor handle, stock?

[love_boost]

boost on the turbo if its not a neo is around 12psi depending on the tune.
but thats after FMIC turbo back exhuast intake ect.

on the motor around 450whp is all i would want to push max. but to be safe i wouldt go over 400.

[M13]

it has higher compression than RB20 so it won't take too much boost without making it reliable.

[brnyrd]

My boost gauge reads around 70 or 80kpa. (10-11 psi).
Its a HKS gauge so I'm thinking its fairly accurate. ??? I'm just wondering , cuz obviously I don't wanna run it too high, and if I do, for how long would it handle the boost?

[Zacho]

10-11 your fine.

I found past 14 it begins to lean out on stock ECU.

[SHYUMIDESUGA]

An earlier rb25det turbo can take 1.1 of boost.
Mid and late versions can only take 0.8.
It should be about 0.6-0.7 stock.
Not sure about neo turbos.

[Zacho]

An earlier rb25det turbo can take 1.1 of boost.
Mid and late versions can only take 0.8.
It should be about 0.6-0.7 stock.
Not sure about neo turbos.

What justifies this? I'm curious.

[love_boost]

An earlier rb25det turbo can take 1.1 of boost.
Mid and late versions can only take 0.8.
It should be about 0.6-0.7 stock.
Not sure about neo turbos.

i only understood the neo turbos to have the steel wheel? which can take around 1bar?

[BrianV8]

alright i went through that issue a while ago. here is the result of a month of research and what i've currently done with my car.

Series 1 stock turbo can handle 1 bar all day long. Series 2 stock turbo can only handle a MAX of 12 pounds due to the plastic compressor wheel.

The motor itself
As long as you have all the proper supporting mods it can do a MAX of 18 psi. Not the most reliable though in my books.

What i did with my motor, throw in some ARP head studs, oem head gasket, motor should be bullet proof to 24 pounds with all the supporting mods but be carefull. Any more than 450 Crank hp, apprx 400 wheel hp you max the internals can't take it anymore.

My car is setup with arp head studs, oem head gasket, 20 pounds of boost all day long, had it up to 23 on the dyno, and making 380 wheel hp after detuning on a mustang dyno which is approx a true 400hp wheel due to mustang dyno's reading a little low

[Snow]

I'm guessing my R34 Neo 6 GTT turbo is most definitely ceramic exhaust wheel then hey? Damn. I had a feeling, but I was really hoping it was steel.

I've been foiled.

[BrianV8]

no if its a neo its a steel wheel turbo, you can throw as much boost as you want at that one. If you do arp head studs too you can go past your 18 pound limit and make about 500hp due to slightly stronger internals

[Snow]

woo!
Sweet. I will double check and I will be cranking it up after fuel upgrades

[BrianV8]

oh this thread was about the rb25 motor, didn't realize haha, but yeah that turbo is good for as much as you can throw at it. I actually heard that the factory neo turbo's are made by garrett. Steel wheel and ball bearing

[Snow]

Yea running an RB20. But I know it is most definitely a ball-bearing turbo. BACK OT!

[cschepp]

rb25det series 2 engines can only handle 450 on stock internals.... Thats kind of depressing!