My Rb25/30 Build

[wal32r]

I spoke to nissan, the numbers on the diagram are reference numbers only, RB25DE and RB26DETT valve spring part numbers are different, and R32 and R33 GTR valve spring part numbers are different also.

The guy from nissan assumed the GTR springs would be considerably stronger.

[works 510]

Thread revival!

Budget got raped...

large majority on funds were spent on the oiling system, still shooting for max reliability.

VCT has got the ass, mainly due to a pair of 272 8.8mm lift cams finding there way to my shed, possibly too large, but for $330 the pair, Im willing to try them out.

Starting to assemble the bottom end on the weekend, will throw up a few pics as it progresses.

[[200]]

I spoke to nissan, the numbers on the diagram are reference numbers only, RB25DE and RB26DETT valve spring part numbers are different, and R32 and R33 GTR valve spring part numbers are different also.

The guy from nissan assumed the GTR springs would be considerably stronger.

I noticed that myself when I was stuffing around with fast. I just cbf updating the thread...

[Jeremy1607]

RB30 is the engine block from an R31 right ?

[JonnoHR31]

yes. and VLs

[Amoreuxi]

With the price of rods these days its worth throwing a set in.

If you decide you want to throw set of cams, plenum and 'decent' balancer at it then you feel safe to flick her to 8000rpm odd.

BUT. with 8000rpm you'll be pushing 340rwkw+ and most likely a gt35r unless your ringing the neck out of a GT30, not that ringing the neck out of a GT30 is a bad thing. Its a damn near perfect setup for the power IMO. The response and power delivery simply cannot be described other than a big power N/A with a big top end. I miss mine.

Just don't forget the requirement for a decent clutch and with 340rwkw comes the likely possibility of breaking an rb25 gearbox if the clutch and tyres are decent.

Torque breaks things.......

Edited January 21, 2011 by Amoreuxi

[works 510]

its been awhile....

in between holidaying, other commitments, work and losing interest in my car its finally running.

Well, has been for the last 9 months, still sorting out bugs that the car has/had.

Currently running on rb25 injectors, afm and ecu to put some km's on the engine and sort everything out.

First impression: drives goooood, drives well at low speeds, the IHI turbo isnt too laggy.

Now,

Inconsistant idle.

Sometimes it idles high, some times not at all.

Idle control valve?

Cheers

[Craved]

i had a similar issue, turned out to be the preload spring within the IAC under the plenum was broken, so worth a check if you can get to it easy enough

[Sarumatix]

Just going back to the discussion about valve springs (as this is one of the first threads on valve springs to show on google ), can anyone confirm if R34 RB25de also has the same valve springs as Rb25det? I know the camshaft has less lift.