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Big Power Using Standard Parts

Turbz_13

By Turbz_13,
in Engines & Forced Induction

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Turbz_13 Experienced

Turbz_13

Posted
  • Author
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not at the moment, the rebuild burnt a hole in my pocket. but i may get the crank and oil pump together. then just have the sump pulled off and the crank changed and oil pump changed.

may even get a harmonic balancer, but see what happens. as i have NO intension of reving much over 7500!! well not for the moment anyways!!

but wont they require the balancing???

Turbz_13 Experienced

Turbz_13

Posted
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i fully understand as i have missed gears before and it hit the rev limiter. which is just over 8000rpm in the 32's i thought. this was before the rebuild.

but dont most decent engine management systems these days have rev limiters as a function, im sure the power fc does. so to avoid over reving wont setting the rev limit at say 7500rpm work in the case of missing a gear??

cubes what typre of oil pump are you running? you have a high powered engine?

Cubes Grand Master

Cubes

Posted
Posted

I built mine up over 2 years ago when JUN crank collars were over $600 + fitting. Now they are down $130 ish so it is very very much worth throwing one on as $130 is next to nothing in the grand scheme of things.

I had my PFC revlimit set to 6200rpm due to a valve spring issue, a missed gear change in to fourth and saw it hit just under 8500rpm within a blink of the eye. I find the pfc's rev limit isn't crash hot on free rev's. In gear acceleration its fine.

I run what was supposed to be a rb25det pump that had zero wear on it; I see roughly ~6kgcm/2 (85psi) over 3000rpm and 7kgcm/2 (100psi) over 3500rpm so it has healthy oil pressure.

BHDave Grand Master

BHDave

Posted
Posted

Yeah, but cubes, you have fitted a collar and then run a 25 pump which has the thin drive, and you also keep the revs down due to the 3lt bottom end. In your case i'd say it wasn't needed.

If you were reving to 8k regularly or running a pump with the thicker drive on the stock collar i'd say otherwise, but in this case i'm looking at a lot of money that could have gone towards beer and hookers.

Not denying that it's a known weak point in the r32 rb26's, but if revs are kept reasonable (under 7.5k) then there shouldn't be an issue. There aren't that many rb25's reporting failures with their factory 7k ish limiters and they all have the thin collar.

Cubes Grand Master

Cubes

Posted
Posted
Not denying that it's a known weak point in the r32 rb26's, but if revs are kept reasonable (under 7.5k) then there shouldn't be an issue. There aren't that many rb25's reporting failures with their factory 7k ish limiters and they all have the thin collar.

Agreed but the colars are so damn cheap these days. You'd be pushed to get a decent cim :P hooker for the price of the collar + fitting.

I don't run a collar as it was out of my reach at the time.

The ONLY pump that has the same width drive as the std cranks drive is the RB30E pump.

The RB20det runs a wide crank engagement BUT the inner gear is a touch thinner and from memory it also had one extra lump than the rb25 pump I compared it to.

All the other pumps, RB20, rb25, gtr, n1 etc all have a drive that is much wider than the cranks drive.

The RB25 pump I have looks exactly the same as a GTR pump.

I'm sure you can guess which one is the rb30 oil pump and which is the 25t pump. :)

post-382-1175738326.jpg

post-382-1175738332.jpg

post-382-1175738340.jpg

Cubes Grand Master

Cubes

Posted
Posted

:P

What my point really is...........

The topic of the thread is 300rwkw+.

An rb26 with 300+rwkw doesn't exactly spool such a sized turbo early. Turbo comes on hard say 5000rpmish?, thats a 2000-2500rpm power band. Drop it in the lower gears and its even less. :S

If its being rebuilt.. Why not. :happy:

I hope you lot can see what I'm getting at. A car with a small power band is shit to drive and slow in its lower gears.

Turbz_13 Experienced

Turbz_13

Posted
  • Author
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what sort of oil pump was the first picture of the drive out of?

i understand what ya saying. but dont the early r32 gtr oil pump drive sit alot closer to the block than the ones that require the collar? and with the collar does that require the crank to be machined then fitted or does it slip over the original drive?

Cubes Grand Master

Cubes

Posted
Posted
what sort of oil pump was the first picture of the drive out of?

i understand what ya saying. but dont the early r32 gtr oil pump drive sit alot closer to the block than the ones that require the collar? and with the collar does that require the crank to be machined then fitted or does it slip over the original drive?

It could be either an Rb25 pump or rb26 pump. Not sure.

Oil pumps.. Basically all the same apart from slight differences in width for higherflow etc etc.. All the pumps gear width is much larger than the cranks engagement lug.

Another option is to grab the R33 GTR crank as Nissan rectified the fault in the R33 RB25DET Series 2 and R33 GTR's.

Here's a pic of a gtr crank and one with the collar. The Rb30 crank had the same small engagement lug as did the old rb20; no difference in positioning. Unfortunately it does require slight machining for fitment.

post-382-1175759097.jpg

Turbz_13 Experienced

Turbz_13

Posted
  • Author
Posted

ah so i may have been told a load of crap. therefor the crank on the right hand side(of the picture) is the type of crank that is in my rb26(older 32 gtr)? because i was told that the oil pump drive widths were exactly the same, just the newer one sat further out from the block, hence the witness marks on the r33 gtr pump that was in the car when i brought it.

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