RB25det Turbo Upgrade

[Trini.Madman]

Hey all. I have myself a RB25DE engine (series 2) that I would like to turbo. just want a little more pep from the engine. Its on a automatic transmission right now. (rb25det transmission) What I would like to know, is if I want to use a aftermarket turbo for the sake of it being highflow, (I understand the oem turbo is very restrictive and breaks easily). Is is possible to get a turbo unit that will have almost the exact response of the original, but will not break at lets say 14psi? ( I say 14psi for upgrade purposes only if I ever upgrade the pistons. for now I will run between 5-7psi )

I believe that a good flowing turbo with the high compression of the rb25de will produce a very responsive engine.

I intend to also accompany this turbo with injectors, a extractor manifold, front mount intercooler (small) and piping, fpr and full 3inch exhaust. Debating a intake manifold upgrade also.

Intend to tune with a AEM F/IC-6. 2inch intercooler piping? Maybe 2.5inch if its recommended.

So what turbo is suggested? For response? I don't really intend to pass maybe 16psi ever! but response is most important to me

[Trini.Madman]

Anyone? I just need some suggestions.... Or anyone who has the experience...

[Darius]

Quick answer would be to go with a 3071R with internal wastegate for quick response.

http://www.atpturbo.com/mm5/merchant.mv ... y_Code=GRT

[Trini.Madman]

Internal wastegate for quick response? Will I be able to get 14-16psi on a internal wastegate? Is is less restrictive than the stock turbo by enough to make more power at stock psi?

[meet07]

Internal wastegate b/c it will get the job that you are searching for done. You can see 14 psi on the oem wastegate, yes you can run 14-16 psi. The wastegate is not a restriction. You will make more power at the same boost level than the oem t28 turbo. Bigger turbo more air.

[Trini.Madman]

So internal wastegate will not be a restriction, bigger turbo = more tower at same psi and its a free flow unit so it wont restrict, it will be in its efficiency range all the way to 14-16psi and the number 1 thing I want to verify is, IT WILL BE A QUICK SPOOL RIGHT? almost like stock?

[jbracy7]

Try the garret gtx28,aka the rally potato,will spool faster than stock and take more abuse

[Trini.Madman]

Spool Faster Than Stock? Will it also be able to efficiently boost up to 14-16psi?

[Darius]

Internal gate because it makes for easier piping installation with less fabrication. Can you simply swap an RB25 turbo exhaust manifold onto the RB25DE or are the last two runner flanges different?

I recommended the 3071R because it is still super responsive on a 2.5 but you aren't in boost alllll the time like you would be on the 2871. Hell, even guys with S2000's are in boost all the time on that turbo. The GTX series of turbos are a joke. If you are going to spend extra $$ for a little top end, there has to be a reason for it, like you don't want to step up into a larger size of standard turbo.

What I think you need to do is tell us your power goal so we can help you out more effectively. Going by boost is irrelevant because 14 psi on your stock turbo will make about 280HP where 14 psi on a GT42 would make like 500HP. Also, what are you planning for fueling and ECU modifications?

[Trini.Madman]

Ok well to begin with, I wont be using the OEM exhaust manifold, I intend to use a aftermarket extractor type manifold. I believe this will help with Lower end torque.
Also, Piping and modifications isn't a problem, so external waste gate vs internal, If it doesn't affect spool response or makes any positive/negative impact in anyway, it wont matter to me.
I don't have any sort of "power goals" what I want is more response from my NON-Turbo engine which is supposed to be higher compression. Now I know I can only go so far with the stock turbo.

I am looking for a turbo that will perfectly suit my responsive needs for my application.
I will be
-upgrading intake manifold (slightly bigger injectors)
-upgrading exhaust manifold
-Going with a small fmic
-probably 2inch piping maybe 2.5 if its necessary but I think 2inch will help with response
-I will be installing Oil Squirters but I do not want to upgrade internals as its very expensive where I live.
(its cheaper to install a full turbo kit than upgrade pistons and rods)
-will be tuning with a AEM-F/IC6
-Will install a FPR
-Will Probably Upgrade fuel pump if its necessary.

For a "workable figure" lets say I want 300hp at the wheels? so off idle, with my automatic transmission, I can loose the traction with ease if I WOT.

Was wondering if it makes sense Installing a N1 Oil pump and Oil cooler while im at it?
But that's what im looking for, with the number 1 thing being RESPONSIVE TURBO! I need to be spooled as I press the throttle at any RPM, or it wont make any sense to me to turbo the engine.

[Darius]

The OEM exhaust manifold is actually of a solid design. I'd run that before I'd run a cheap Chinese manifold if that's what you had in mind.

If you are looking for absolute immediate response, you're going to get a turbo smaller than the stock turbo, or consider going with a custom supercharger setup.

[jbracy7]

Well whats wrong with being in boost,(shame face)

[Trini.Madman]

Going with the gtx28 will mean massive response? Can i make 10psi efficiently with that?

[Darius]

Well whats wrong with being in boost,(shame face)

Being in boost all the time destroys any hope of getting decent gas mileage.

[240z4u]

I wonder how much air that motor is going to tolerate well without detonation. Just thinking out loud here. I imagine your 300 wheel goal is going to be cake to achieve.

[meet07]

I wonder how much air that motor is going to tolerate well without detonation. Just thinking out loud here. I imagine your 300 wheel goal is going to be cake to achieve.

Yeah I thought the rb25de had a pretty high compression?

[jbracy7]

Well whats wrong with being in boost,(shame face)

Being in boost all the time destroys any hope of getting decent gas mileage.

Ahh,the mpg i never really paid much mind was to busy enjoying the boost

[Trini.Madman]

Lol. No1 give me a direct answer to the gtx28 thing... would it make 10psi efficiently? so I can use a reasonably small intercooler to remove lag