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HKS Adjustable Cam Gears

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whatsisname Grand Master

whatsisname

Posted
Posted

Even though you guys missed out on getting the gears, one small point to remember!

You can ONLY do the exhaust cam gear on the RB25DET due to the VVT on the inlet cam gear. It "MAY" be possible to modify or adapt the stock inlet gear or even the HKS one but it would be a bugga' to do it & not worth the cost for such a small gain ( around ~5rwkw max even on a full bolt on upgraded turbos etc... RB26DETT motor).

I gained roughly 10rwkw (so far) from doing the ext' gear (via 4' retard), I say so far as ECU issues caused problems @ dyno testing was unable to be completed :P

For anyone thinking of doing this mod I suggest waiting until you have a way of over coming the stock ECU's timing retard (the cause of the dreaded RB25DET flatspot) the adj' ext' gear only makes this problem much much worse :x you gain power but you get a very poor power curve (& the car will drive poorly).

Sorry to hijack the thread people, thought this info might help but.

two40 Grand Master

two40

Posted
Posted

Thanks for the heads up. Ethan 33 told me this just as I was going to order some from a local dealer.

Mot all 33's come out with VVT did they? The reason I ask is that my mechanic asked me what year my 33 was. He said that the late models have them but not the older ones. Weird.

whatsisname Grand Master

whatsisname

Posted
Posted

No prob's mate.

My GTS25t is a late '94 model & it's has VVT.

If you look @ the black t'belt/cam gear cover front on (ie standing @ the front of the car looking into the eng' bay) one side has the alloy crank angle sensor (exhaust cam gear) the other side has a bulge (inlet gear) the bulge is to clear the VVT gear. Just back from the inlet gear on the side of the eng' is a long housing with an elec connector on it, this it the VVT solenoid. The VVT is there to improve bottom end power NOT top end!!! (So I'm lead to believe!?!?!)

I'll see if I can dig up a pic with arrows pointing to the bits in ? :P

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