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R32 W/r34 Head - Not Boosting

DanShirts

By DanShirts,
in Engines & Forced Induction

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DanShirts

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Here is the back story:

I had the timing belt tensioner stud break while the engine was running. My engine had a few bent valves as a result.


I had a freshly rebuilt R34 head sitting on the shelf that I was saving for an RB30 build. It found its way into my R32. I used the R34 cams and swapped the R34 cas too.



The problem:

It only makes about 1/2 the boost that it should. It also sounds odd. It sounds like the timing is wrong.


Is there a difference between the R32 and R34 timing marks? Do I need to remap for the R34 head and cams? Or something else?

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https://www.sau.com.au/forums/topic/429339-r32-wr34-head-not-boosting/
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DanShirts Collaborator

DanShirts

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It is a stock R32 RB26 block. The manifolds are R32. I have replace the head, cams, and cas with parts from an R34 RB26. The head was rebuilt by a very experienced head builder. I rewired the cas plug to suit the R34 cas. I used a new oem head gasket. I also put in head studs while the head was off.

It's probably not relevant, but I also has an R34 crank, oil pump, and turbos installed. These upgrades were done a few years ago, and shouldn't have any effect.

I think that covers everything!

Ben C34 Grand Master

Ben C34

Posted
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Your compression ratio would be a fair bit higher now.

http://www.webbersrbguide.com/index.php?option=com_content&view=article&id=90:rb30dettt-compression-ratio-a-piston-selection&catid=50:rb30dettt&Itemid=29

DanShirts Collaborator

DanShirts

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I think my first post was a little confusing. I didnt use an RB30 block. I bent some valves. Rather than replace the valves, I replaced the entire head with one that I was saving for a different build.

Edited by DanShirts
KiwiRS4T Grand Master

KiwiRS4T

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According to your link the compression ratio would be exactly the same across all GT-Rs.

There is a difference in valve timing (not lift or duration) according to this Tomei chart but I don't know if that would halve the boost:

http://www.tomei-p.co.jp/_2003web-catalogue/e090_camshaft-specs.html

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