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Cas Modding..

rad100

By rad100,
in Engines & Forced Induction

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rad100 Grand Master

rad100

Posted
Posted

hey all..

i have been reading and searching.. both here and google..

now i have purchased tomei poncams for a s2 rb25det..

now i believe tomei classify the s2 poncams for the late 97model rb25 with the plastic cas..

so i have read u can mod the wires on the cas and fit the plastic cas on..

1- can the cas be modded to fit?

2- will the hks exhaust cam gear i got still fit on?

3- if i buy a inlet cam gear can i remove the vct (rb25 in a r32 running no vct from nisstune)?

cheers

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STATUS Grand Master

STATUS

Posted
Posted
ok well its not backwards for me atm...

im not running vct and it doesnt bother me..

so can i rewire the s3 cas? or should i sell the poncams and get s1 cams?

cant see it being an issue. I run R34 GTR's off R32 gtr ecus's....

Get two cam gears and spent some time on the dyno, you can get the cams to work well without vct as this dyno graph shows.

http://www.skylinesaustralia.com/forums/Rb...ft-t308743.html

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blind_elk Grand Master

blind_elk

Posted
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All the CAS does is tell the ECU where TDC is for each cylinder, and where each degree of crank rotation is. So, basically, a CAS is a CAS.

If you don't want to run VCT, simply leave the electrical connection off the VCT solenoid.

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rad100 Grand Master

rad100

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i dont care about not having the vct.. so im gonna get cam gear to repace it so i can fit my rb26 cam cover to finish of my rb26 rocker covers..

im happy with everything i have atm just wanna instal these cams with the r34 cas..

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PM-R33 Grand Master

PM-R33

Posted
Posted (edited)
thanks status, i have a hks exh cam gear atm so ill hit up for a hks inlet to boot..
If you have bought RB25 Poncams for VCT than no you can not simply take the VCT off and put a cam gear on there. Why would you want to do that though, its a step backwards.

As I said above, you can not fit a normal cam gear to replace the VCT gear. The VCT gear and camshaft is special because it has a single bolt that goes into the centre of the camshaft. Cam gears have four small bolts that go into the camshaft, like on the exhaust side. So how are you expecting to fit it?

The main advantage a RB25 has over a RB26 is the VCT, so why would you not try and keep it if you can. If you allready have an ECU that doesn't support VCT just get an aftermarket controller to run it.

So really you only have a couple of options.

If you want to get rid of the VCT completely and fit an aftermarket cam gear, you need a different intake camshaft not made for VCT (RB20 or RB26).

If you are keeping that camshaft you either just leave it as it is without running the VCT or you get it running.

They are your options.

Edited by PM-R33
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