What Power With Rb25Det Head On Rb30?

[Ohlsson]

Hi Guys!

I wonder if anyone know how much KW an unported rb25det head can handle on an rb30? Is it worth fitting Tomei Poncams and harder valvesprings on an unported head?

If the bottom is forged, balanced and has a nitto or Tomei oilpump with the longer crank collar would it be safe to rev 8000-8500 with the std hydraulic lifters?

I also wonder if it´s worth keeping the NVCS when build an rb30 or is it better to not use it, As the rb30/25 has enough torque at low rpms?

I will use Ethanol as fuel if it matters.

Sorry for newbie quests

[R31Nismoid]

370rwkw has been made on a stock RB25 head, 8000rpm.

[Ohlsson]

  On 21/03/2011 at 12:19 AM, R31Nismoid said:

370rwkw has been made on a stock RB25 head, 8000rpm.

Wow is that tot stock with std cams to?

[R31Nismoid]

yes, stock.

[Ohlsson]

realy impressive! Wonder how much more poncams would do if it´s worth it before porting it?

[bubba]

I concur. We made 365rwkw with a stock RB25DET head/cams/plenum/throttlebody (on a 30 bottom end).

Edited March 21, 2011 by bubba

[MRHD66]

  On 21/03/2011 at 12:19 AM, R31Nismoid said:

370rwkw has been made on a stock RB25 head, 8000rpm.

. what size turbo and what intake and exhaust manifold it have cheers Edited May 6, 2012 by MRHD66

[StevenCJR31]

  On 21/03/2011 at 12:35 AM, Ohlsson said:

realy impressive! Wonder how much more poncams would do if it´s worth it before porting it?

you must have DEEP pockets, you would be looking at around $1000 just for the cams alone. . . the oil pump is right up there too

[KiwiRS4T]

  On 21/03/2011 at 12:16 AM, Ohlsson said:

Hi Guys!

I wonder if anyone know how much KW an unported rb25det head can handle on an rb30? Is it worth fitting Tomei Poncams and harder valvesprings on an unported head?

If the bottom is forged, balanced and has a nitto or Tomei oilpump with the longer crank collar would it be safe to rev 8000-8500 with the std hydraulic lifters?

I also wonder if it´s worth keeping the NVCS when build an rb30 or is it better to not use it, As the rb30/25 has enough torque at low rpms?

I will use Ethanol as fuel if it matters.

Sorry for newbie quests

Keep the VCT - no such thing as too much torque.

[NYTSKY]

550rwkw with HKS step 1 cams.

[MRHD66]

  On 06/05/2012 at 11:59 AM, KiwiRS4T said:

Keep the VCT - no such thing as too much torque.

+1

[MRHD66]

  On 21/03/2011 at 3:07 AM, bubba said:

I concur. We made 365rwkw with a stock RB25DET head/cams/plenum/throttlebody (on a 30 bottom end).

What rpm and what turbo @ what psi and What exhaust manifold ??

[ydr030]

wouldnt bother with pon cams on a 3ltre.

[MRHD66]

  On 10/05/2012 at 10:30 PM, ydr030 said:

wouldnt bother with pon cams on a 3ltre.

don't make a big enough difference ??