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Rb30det Cams Question

James_03

By James_03,
in Engines & Forced Induction

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James_03 Mentor

James_03

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Posted

Hey guys,

Just about finished building my second rb30det. My current setup I am using a rb25de head, I have a 26 head I am taking the valve springs out of today to swap into the 25 head so it doesnt valve float.

Just wanted to know would it be worth swapping the rb26 cams in as well?, or just retain the stock rb25 cams with the 26 springs?

What are peoples opions, its running aftermarket management obviously.

Cheers.

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Cubes Grand Master

Cubes

Posted
Posted

The rb26 cams are solid, their ramp rates are too aggressive for hydraulic lifters.

So no. :(

When using the stock plenum cams only gain a little mid range and spool the turbo a touch more. It doesn't extend the peak power rpm and they don't hold power up better. An after market plenum is what does this is it appears the stock plenum on the 3ltr restricts top rpm peak power and how well power holds after peak power is made.

I would have dropped the rb26 head on the sucker.. its not too late yet. :P

While your there, is it possible to measure the stock r32 rb25 valve spring installed height on both the inlet and exhaust?

James_03 Mentor

James_03

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Posted (edited)

k cool I wont bother then.

yeah I can measure them for you man. Its a r33 vct 25de head but not a 32. Yeah I would have used the 26 head but I am using it for something else anyway.

Cheers.

Edited by James_03

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