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What is your MAX BHP on STOCK T25 Turbos ????


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Discussion Starter #1 (Edited)
If you have ~500hp or more on STOCK turbos, what boost and spec are you running????


I recently had my engine rebuilt, and rather then replace the standard, (albeit with steel internals), with larger items, I would spend my money on 'optimising' the rest of the my engine set up interested in seeing what a 'stock' T25's could do.

I have see 500+bhp cars, but thought it would be interesting to see what the highest is.

I am still running the forged internals in, but I am just interested to see what I can expect at a relatively 'safe' 1.4 bar.


Additionally, if you do have experience in pushing T25's, what do you think I'll get with the following spec:

HKS Exhaust Manifolds, Elbows and Hyper muffler.
Fully heat rapped turbo Assy.
Apexi Down pipe.
550cc Inj.
Baffles and porter Twin Turbo pipe.
Stock IC, (as its still good enough)
ECU: I'll sort that once run in.
AVCR

Any predictions?
 

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Discussion Starter #5

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Discussion Starter #8
But why would you want to push your stock turbos and put your freshly rebuilt motor in harms way? It's suicide!
I should clarify, when I say 'push' I mean use more fully.

I am in no way intending on building a grenade engine here and intend on a safe margin, hence why I suggest ~1.4 bar and let the gains in efficency else where produce the power.



Stick 2 standard RB25DET turbos on
Thanks :rolleyes: , but what turbos I should use is not the issue or question here, if it was I'd go for 2860's.

I am trying to find out what hp others have from stock T25's.
 

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I would expect 450-480bhp flywheel power. You may need to add AFMs to your list as they will be close.

Ecu wise I would just get the standard one remapped.
 

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Discussion Starter #10
I would expect 450-480bhp flywheel power. You may need to add AFMs to your list as they will be close.

Ecu wise I would just get the standard one remapped.
Thanks Richard.

I was wondering about my AFM's. I was going to get one of RK's 550cc injector chips then get Danoh to check everthing out to make sure its not lean any where.
 

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I wouldn`t bother with the chip just get it custom mapped as its not just the fueling that need to be correct and it will be right from the begining. :)
 

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Hiya

When my standard turbo's bought the farm and decided to go through the engine I replaced with standard R34 turbo's.
Though the engine internals were rebuilt and HKS 264 cams put in I never went above 1.1 bar and the car was very happy. Spooled a lot quicker than before though this may be due to fully decat exhaust system.
Something I must also add is, when I went fully decat, a short while after I started getting boost spikes to the point where I was overboosting to an indicated 2.0bar before we got scared and dropped it back down.
I was told standard turbos with steel internals can easily handle 1.4bar and if this is the margin of error you are looking for, I can't really see it being a problem with your engine with the way it has been rebuilt.
 

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As stupid as this may sound Scott, the only reason my car has been dyno'd is so I wouldn't be telling fibs when I put the RK500 sticker on it!
Until then, as I was only running 1.1 bar I thought I would be running circa 450bhp so didn't bother.
I just wanted the car to respond in the midrange which it was doing very well and does even better now with the 2860's and the sterling work done by my chosen tuner :)
I think I would guestimate 450 but have no real proof.
 

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Discussion Starter #19
Jae,

I would really love V-Cam, but its the cash really. :(

If I did have the money, I think I would spend it on the 2860's first, as the will flow more plus spin up earler too. Then of there was any £ left I'd go V-Cam.
 

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Don't know you mean by standard as in the ones that come on the car or produced for a rb26? Anyway I have r34 N1's and running 1.1 bar we had well over 530hp but need to dyno again as it has had work since then. Thats on a built 2.7 though.
 
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