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R33 Rb25 Vct .

discopotato03
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discopotato03 Grand Master

discopotato03

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Hi all , someone here mentioned that R33's are set up so the overlap is closed up for idle then opens up till about 4700 and closes to reduce reversion .

I remember reading an article a few years back about JWT remaping an NA CA18 computer and noting that power fell off up near the red line . In this case the cams were opening up (reducing overlap) and the power falling off most likely to convince people to change up .

I'm wondering how alterations to an RB25DET ie mild cams and efforts to reduce "backpressure" are affected by the std cam changeover points . I'd reckon the change back up high would not do any favours if there was not a lot of exhaust manifold pressure in relation to boost pressure .

Has anyone played with the change points and gained anything worthwhile ?

Cheers A .

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