RB20 vs Rb25 vs RB26.

[love_boost]

so not yet sure were i want to spend my money or what dirrection to go with my R32 GTS i thought i would ask for some help.

now i know the RB20 probably would be the worst choice to build up thats why im kinda considering against it.

but i got a real good deal on a blown RB25 engine would it be cheaper/ easier to build this engine for higher hp? ACL bearings, ARP studs, oil pump spool conrods and wiseco pistons, GTR or poncams, rebuilt head timing belt ect and intake manifold.

or would it be better to get a RB26 front clip and just do bolt on's and run a little higher boost?

im stuck between the 2 because stock vs stock the 26 only make 25~hp at the crankthan RB26. but then again if i had a fairly built motor for around the same price that i would spend on a RB26... i also like the idea of having 2 turbos so it stays fairly responsive and in a GTS i think it would be pretty nutty for a street car.

thanks for your advice.

[Shadao]

go big or go home...

if you get an RB20, you will wonder what a RB25 is like, if youget a RB25 you will wonder what the RB26 is like, if you get the RB26 you will not care about the other 2 and ya

[titaniumrings]

aren't you forgetting the rb24s? (jk)

[love_boost]

aren't you forgetting the rb24s? (jk)

lmfao just waiting for rabbit to read this...
shoulda threw it in there for shits n giggles lol.

yeah i was impressed by my friends 25 which made me wonder what i want with a 20.

it seems more logical for the 26 what can the stock bottom ends take with a good reliable tune?

also if i got a R33 RB26 did they still have the same oil pumps and the R32's? or would the R32 pump be fine if i didnt rev to 8G

[NismoS-tune]

Opinion: RB30 would be better than 26 and I even think it's cheaper. More torque, less modding less GTR $$$ costs.

I've seen 8000 RPM on stock turbos/oil pump/oil pump collar on both cars. One 23,000km and one at 3,900km. Both fine. If the engine is coming out though, take an R33 crankshaft or a JUN collar with an N1 pump.

[RABBIT]

SEE I KNEW YOU GUYS WOULD COME AROUND !!!

but yeah you shoudl try and build a hybrid motor, or even a RB30 from scratch kinda thing.

[M-SPEC]

Depends on what you want out of the motor, torque or HP

The RB25 with the NVIC system enabled and a quick spooling turbo would make for a real fun street motor with lots of torque

The RB26 is good if you stay away from the pre 94 blocks with the crappy oil drive (every one I know with one blew up) but they have a really well built head with solid lifters that is well suited for higher RPMs with a few upgrades which means lots of high end HP

Overall I would say the RB25 will be more reliable being a bit more simple than the RB26 ie..no ITB's, half the piping and easy wiring compared to putting a RB26 in a GTST and they are only .10 of a litre smaller than the RB26

I would be VERY hesitant to build a performance engine from a blown or spun block, you never know how much heat it was exposed to or how much machining it will need to be straight, then all the oversized main bearings and all that crap ... its not worth it

[love_boost]

yeah decided against doing that already.

so if i were to get a N1 pump that should be fine for the oiling part, thats my biggest worry of a 26. And since i have to swap oilpans anyways...

i think i would be happy with around 350-400whp, just have a fun little car, with a Rb25 i would need to look at bigger turbo, injectors, retune. With the 26 im sure i could see around 350rwhp with a retune and higher boost? of course while it is out of the car i would do the regular maitnece, N1 oil and water pump, metal HG ect.

[CanadianGTR]

LS1 ftw

(you think I'm joking)

[Turismo]

I really don't see the oiling issue with the 26's to be as big as most people think. If you keep it from bouncing off the rev limiter you're going to avoid the headaches. There are a TON of these engines that are running perfectly with the smaller drive. Not ideal, but be smart about it.

also to hit 350whp you'll need all the bolt-ons as well. intake full exhaust. Definitely look at bigger dump pipes while the engine is out, even manifolds depending on budget.

[CanadianGTR]

I really don't see the oiling issue with the 26's to be as big as most people think. If you keep it from bouncing off the rev limiter you're going to avoid the headaches. There are a TON of these engines that are running perfectly with the smaller drive. Not ideal, but be smart about it.

also to hit 350whp you'll need all the bolt-ons as well. intake full exhaust. Definitely look at bigger dump pipes while the engine is out, even manifolds depending on budget.

http://www.jegs.com/i/Carter/180/A68301/10002/-1

$25 insurance policy, hook it up to whatever... fuel pump, ignitor, etc.
Oil pressure drops, it cuts spark/fuel pump.

You can do the same thing with fuel... fuel pressure drops, cuts spark. (different switch)

So for $50 you have given yourself a decent failsafe in the event that your oiling system and/or fueling system decides to take a fit.

[DrMango]

http://www.jegs.com/i/Carter/180/A68301/10002/-1

$25 insurance policy, hook it up to whatever... fuel pump, ignitor, etc.
Oil pressure drops, it cuts spark/fuel pump.

You can do the same thing with fuel... fuel pressure drops, cuts spark. (different switch)

So for $50 you have given yourself a decent failsafe in the event that your oiling system and/or fueling system decides to take a fit.

WOW thanks for that advice. ive never heard of that before. Definitly getting that on my car with my rebuilt 20

Kyle

[Skym]

It does depend on what you want from the car.

RB20DET is cheap to replace second hand and can take a thrashing.

Also RB20DET powered R32 is faster than R32 GTR, etc in Targa rally with stock engine, stock turbo -

http://www.youtube.com/watch?v=fgD5j52ltFA

The R32 GTR had a big head start and is producing alot more hp.

Alot of people underestimate what the stock RB20DET is capable of, which is what makes it a interesting engine.

Fully modified RB20DET powered R31 is faster than R32 GTR on the racetrack -

http://www.youtube.com/watch?v=NRThRPAuihc

All of those cars in above videoclip were built by the same raceteam.

[Andrewc]

If you're worried about oil issues, get an accusump or some other oil accumulator. The self priming ones for startup are pretty kickass. When my rb20 is set for a rebuild, there's definitely one going in my car.

[JD74]

Also RB20DET powered R32 is faster than R32 GTR, etc in Targa rally with stock engine, stock turbo -

http://www.youtube.com/watch?v=fgD5j52ltFA

The R32 GTR had a big head start and is producing alot more hp.

Please......the driver of the GTR had some serious problems coming into the corners (if you watch the video where he is caught) and the GTS driver was coming in breaking deep by comparison.

That was a driver's race.....sorry Skym.

And the 'pull' at the end ? Simple: simply giving way to a better driver.....and from the sound of the '26, nowhere NEAR in an RPM range to pull on the RB20 being up high at most likely full boost.

Switch drivers from those 2 cars and I bet the GTR does a little better.