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25Det Oem Turbo In A 30Det Dohc.

texman30det

By texman30det,
in General Automotive Discussion

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texman30det Rookie

texman30det

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Hi guys,

I am currently building a rb30det with 30e block and r32 25de head. ACL bearings, OEM conrods, OEM pistons etc and ACL rings and the normal works on the head. Motor will be ready next week and i was going to run my motor in with a factory 25det turbo, question_ has anyone tried this?. and what sort of power were they gaining?. Im being realistic about the fact that im not expecting much HP from it. BTW im new to this site and thanks in advance for your time.

Cheers Tex.

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iruvyouskyrine Grand Master

iruvyouskyrine

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Won't make much cause the turbo will be choking it, around 180-200rwkw. My mate has a RB20 turbo on his twin cam 30, makes max torque at 2000 rpm but has nothing after 4k

All I can say is why? :|

A R34 turbo would run him $300 and have more usability.

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texman30det Rookie

texman30det

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Yea i thought running the new build in with a ser2 oem factory turbo with rev limiter set at 3500, all with factory ecu tune. Thats not bad for a 20 det oem turbo, so i will running with better numbers then ay. HX40 turbo is the next upgrade. Just good to know someone has tried it before i did

jjman Mentor

jjman

Posted
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bottom line is they are old turbos and the kind of flow a 30 is going to give it I see a turbo failure in its very near future.

decide on your turbo setup and shell the $ for it and do it all at once. no point in scrimping at this stage. (but on that note, why go this far and also go for stock rods and pistons?).

otherwise, im sure hypergear can sort you with a suitable turbo for the application at a damned good price.

GL

texman30det Rookie

texman30det

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Stock rods are same as stock 30et rods and forged pistons are harder on the rings.Stock oem bits are proven over n over again by RIPS NZ for doing well over 600hp and still running stock,like i said im only using it to run the motor in.

jjman Mentor

jjman

Posted
Posted

Stock rods are same as stock 30et rods and forged pistons are harder on the rings.Stock oem bits are proven over n over again by RIPS NZ for doing well over 600hp and still running stock,like i said im only using it to run the motor in.

fair enough. I hear you :)

just be careful with a stock turbo as there is the small chance that if it lets go (highly likely if u keep it on there very long or run it a boost) that when it lets go its will smash the compressor wheel and send it into the motor. Obviously requiring a rebuild...

niZmO_Man Grand Master

niZmO_Man

Posted
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Yes it will work, it'll make full boost by 2,000rpm LOL. It'll get you running so that's the main thing. No point thrashing it though, the turbo will be chocking. It will drive pretty much like a stocker RB25 but with a lot more off-idle/bottom end torque. Run 8psi max (or 5psi off the gate), once the engine is ready, put a GT3582R on it :P.

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