Questions Abiut Cams

[base308]

Hi guys not sure if I'm in the rite section but what ist the difference between rb20 and rb25 stock cams and can you put the 25s in a 20 for a slight power increase just wondering cause I have a set of both but car is getting a 20 put in so chasing free power really

Cheers brenno

[GTRNUR]

RB25DET cams are designed with VCT in mind, and wont work with an RB20. RB26 cams have been fitted to RB20's though. Do a search and you'll come back with plenty of info. 2nd hand stock R32/R33 GTR cams are pretty cheap too when you can find them.

[base308]

Thanks for the help will sus it out

[bubba]

Pretty well every report I've seen of RB26 cams in RB20 they didn't actually run too well, if at all. I thought about it, but it's a fair bit of effort to run like a bag of shit.

The profiles of the lobes are completely different due to the fact that RB26 is solid lifter and RB20 is hydraulic, the ramp rates for the opening/closing of the valves is vastly different.

[Plan-FAILURE]

Hi guys not sure if I'm in the rite section but what ist the difference between rb20 and rb25 stock cams and can you put the 25s in a 20 for a slight power increase just wondering cause I have a set of both but car is getting a 20 put in so chasing free power really

Cheers brenno

Don't bother camming an RB20 unless your making BIG power (300 rwkw+). Also if you are going to cam, go custom, don't bother with PON Cams - they're poorly made and I've heard loads of troublesome tales about camming the rb20 with Tomei Pon Cams.

If you want good power gains on your RB20 slap on a Z32 AFM, FMIC, Bigger turbo, bigger injectors, bigger fuel pump, full exhaust, plazmaman plenum and a 6boost turbo manifold. I'm waiting on the plenum and turbo manifold to go in and I should see 280rwkw

[89CAL]

With a stock ECU?

[luvpsi]

With a stock ECU?

read my mind thats what i was going to say but im assuming being a obvious mod they would have don that

[Adriano]

Dont bother with the plenum, or the maniold, If you must put a stock rb25 ex manifold on, they flow over 300rwkw, and cost $50

[Dave.TAS]

Is there actually a differecne between 20 and 25 exhaust manifolds, i was under the impression they where the same?

[base308]

No the manifolds are identical cheers for the help guys give me something to think about was more for the fact that I have s rb25 sitting there in parts was just chasing free power and I little extra torque as the rb20 is going in a vl cheers brenno