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Cam Gears

mitchy_

By mitchy_,
in Western Australia

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mitchy_ Grand Master

mitchy_

Posted
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ok, so im looking to get an adjustable cam gear fitted when i take my car to get retuned next week.

now most stories ive heard are people telling me to do the EXHAUST cam gear, and it helps keep the top end power, whereas the INLET does stuff all.

then today i heard form a reputable tuning shop that its better to do the INLET cam gear, as it helps low end power, and the EXHAUST cam gear is less affecting...

soooooo... which one is it? ideally i want a better low end, so adjustable INLET sounds the better option, but what are peoples experiences?

(and unless someone can get me a really good price on both cam gears, dont suggest doing both)

cheers.

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djr81 Grand Master

djr81

Posted
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ok, so im looking to get an adjustable cam gear fitted when i take my car to get retuned next week.

now most stories ive heard are people telling me to do the EXHAUST cam gear, and it helps keep the top end power, whereas the INLET does stuff all.

then today i heard form a reputable tuning shop that its better to do the INLET cam gear, as it helps low end power, and the EXHAUST cam gear is less affecting...

soooooo... which one is it? ideally i want a better low end, so adjustable INLET sounds the better option, but what are peoples experiences?

(and unless someone can get me a really good price on both cam gears, dont suggest doing both)

cheers.

Common wisdom is that you will get a larger gain by retarding the exhaust cam than from advancing the inlet cam. So given the choice, do the exhaust.

However, for the extra $200 ish you may as well do both.

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GTS-t VSPEC Grand Master

GTS-t VSPEC

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If you have an R33 GTS-t, then changing the inlet cam gear is not so simple as it controls the variable cam timing. Therefore most people only change the exhaust cam gear. Some of the guys over east have been working on an adjuster for the stock R33 Inlet cam gear, allowing you to keep the variable cam gear, while allowing some adjustment.

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caminperth Grand Master

caminperth

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Big difference. Loss of low end power. Try it out by unplugging the VCT solenoid plug. It's just above where the top radiator hose goes in.

That said - I haven't seen what an aftermarket inlet cam gear does. It might be all good. All I can add is that I did the exhaust gear and it helped bring boost on a little earlier.

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GTS-t VSPEC Grand Master

GTS-t VSPEC

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Pretty easy to do, but if you get it wrong, then the timing will be out, and could do some damage. Only attempt if you know how to install your own timing belt.

I wouldn't remove the VCT, it's one of the best bits about the RB25's.

To tune the cam gear, allow 1-2hrs of dyno time. With stock cams the benefits are small, more worthwhile if you have a set of aftermarket cams to tune.

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mitchy_ Grand Master

mitchy_

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Mitchy, i have a Greddy cam gear for sale if ya interested. Brand spanking, never come within 20m of an engine only a book shelf  :D. $180 if ya interested.

very interested, greddy is the one i wanted.. but they are $175 new from nengun.. any better price? :)

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ossie_21 Grand Master

ossie_21

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I prefer to not do things by halves, and am going to do both at the same time when the time comes. And I'm not too sure on screwing around with the RB25 set up either!!

BTW Mitchy check your pm's!

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GTS-t VSPEC Grand Master

GTS-t VSPEC

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How does VCT go with aftermarket inlet cam? Or would you ditch it? can you ditch it? I imagine it wouldn't function as well as it should..

You can buy cams that are designed to work with the VCT, I have a set of Apex'i GT cams, 270deg 8.9mm lift that work with the VCT.

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