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Neo rb25 conversion

huks

By huks,
in Engines & Forced Induction

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huks Apprentice

huks

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Hey guys I might be doing a Neo Rb25 conversion into my s13 as my mate has a half cut of a r34. TOkyo toys can do the conversion. Now how is the potential of a Neo rb25? Like I heard its hard to tune as most tuners(here in qld) dont know how to tune them for more power. Any r34 owners here have problems with getting more power?

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https://www.sau.com.au/forums/topic/19584-neo-rb25-conversion/
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dojobi Experienced

dojobi

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Are we talking RB25DET Neo or RB25DE Neo here? I haven't heard anything about either being hard to tune. As far as I know they're basically the same as the R33 engines.

I reckon an RB25DE would be a nice cheap upgrade for a Q's Silvia or even a K's CA18DET. Have you checked out how it will affect the weight balance?

huks Apprentice

huks

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Mase - Hehe nah dude its completely legal. Its been done heaps of times. Some of my friends have rb20's and rb25s in their silvia's/180s. The rb25 ones go REALLY HARD. They are awesome. Just that none have seen a NEo rb25 in a s13.

MIC33R - This is a Neo Rb25det. Well I knew a mate who has a r34 and he spent like 10 grand with upgrades and to only get maginal gains. This was done at sub zero too, so it was at a pretty reputable place. BUt yeah he says that just the tuners here in QLD dont have much experience in tuning the NeO engine. But I think NSW it might not be the case as there is probably a more wider range and experienced tuners there.

Steve Grand Master

Steve

Posted
Posted

Doesnt it have improved VVT as well, ie greater range?

Just about any turbo motor will improve from stock if you stick to the age old formula, ie, exhaust, intake filter, management, boost. After that it goes on, cams, cam gears, porting, bigger turbo etc - usual stuff. This is of course not taking into account weaknesses in any support systems (fuel system, clutch, etc)

HPI have run a series of articles on an R34 GTt (RB25DET Neo), and have extracted much better power using exactly this process. At last count I think it was putting down approx 230-240 odd rwkw with a highflow, and now they are doing injectors, turbo, manifold, head gasket, mild port - aiming for around 300 ish.

I am not aware of any major differences between the R33 and R34 engine at the basic block/head design level

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