Rb25det Neo

[Roy]

Even if my compression test comes back favourably (may be too tired to bother with futher mods) im interested in hearing the input of others.

Anyone out there with an R34 GTT or an RB25DET NEO engine fitted to an earlier car.

Looking at the stats, they have the same HP and almost the same torque (NEO @ lower revs) as an R32 RB26DETT (were Nissan underrating HP for the GTR even back then)

I know for all out performance the RB26 has more potential but the NEO is a little bit cheaper and a lot newer and also an easier bolt in for an R32 GTST.

Unless you look at R33/34 RB26 which will also require a computer the RB26 wouldnt seem to be that better an engine in light tune, ie exhaust/filter/boost/IC.

Are the NEO engines a big improvement over the R33s engine.

I would love the banshee noise of an RB26 DETT but money comes before engine note.

[meggala]

the only reason to go neo over r33 rb25 is klms as they are generally less the r33 has an easier power fc route and alot of other reasons for getting it and you should also considewr an rb25 det gear box

meggala

[Roy]

Looking at a piece of paper can be decieing i know, but the NEO has a lot more torque than R33, and more HP. I think HPI did an article a few years ago on the NEO when the GTT was first released, and i recall they had considerable internal changes as well.

I would love to spend $$$ on internals and revs for my RB20DET (Go the Gibson R31 GTS-R, they sounded sweeeeeet) but i suspect this would cost more and produce less usable power. Don't really know, $5000 on blueprinting RB20DET or bolt in NEO/R32 RB26

Anyway getting ahead of myself, i have no reason at this stage to believe my engine may need a rebuild/replacing , but before i go to the considerable expense of turbo, diff and plenum i should ensure my baseline engine is sound.

[meggala]

of course you should roy there are a number of mods needed to fit an rb 25 to a r32 remember that heater hoses etc. teh r33 ecu is more compatible.

one thought is to buy a stuffed rb25 det and put in gtr pistions and possibley crank & rods then you have a good basis for 250 rwkw kw all day every day the rb20 can give you that type of figure with out going for the full forged rebuild.

you could probably see 220 rwkw on the track for longer races.

oil cooler is nessacary.

think long and hard

plenium is really essential and the money could be spent else where just my thoughts.

meggala

[Roy]

Did you mean to say plenum isnt really essential. I know but the idea is that one day ill have the basic ingredients for a tough engine.

To this end i am able to get my hands on a Greddy inlet off an RB25, which i can make fit my engine. If my current engine is good for more abuse then this will alow me to build an RB30DET in the shed whilst still driving my "ROAD" car. Some would say my IC is overkill, brakes overkill, susp overkill, desired diff overkill, and desired turbo too big for an RB20.

Then when ready remove RB20, in goes RB30DET (OR NEO) with the good bits inc. Greddy manifold, which may not be a necessary performance modification, but i feel is warranted.

Because??? Well the block height of RB30 means i would like to avoid running 3" pipe accross the head, also the pipe in front of cooler gets shit hot during track work, and HPC coating is a good option but cost $$$ and in my eyes is a band aid solution. Also i want the shortest inlet tract possible, and of course aesthetic reasons.

Also ive heard the RB bolt in stories, and realise they arent truly bolt-in & play options, but i have the resources to do almost all the work myself, including custom fabrication.

[meggala]

then roy you are on the right path.

dont stress about the plenium till you get your new motor the rb25 is a better option than the rb30 as it revs better.

sounds like fun

meggala

[Cubes]

Unless you adapt the VCT to the RB30 then there is no point going the RB30 if you are after low down power over the RB25 VCT motor.