Jump to content
SAU Community

Cam Gears

mitchy_

By mitchy_,
in Western Australia

 Share

Recommended Posts

mitchy_ Grand Master

mitchy_

Posted
Posted

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.

Link to comment
https://www.sau.com.au/forums/topic/87514-cam-gears/
Share on other sites
djr81 Grand Master

djr81

Posted
Posted
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.

Link to comment
https://www.sau.com.au/forums/topic/87514-cam-gears/#findComment-1580712
Share on other sites
GTS-t VSPEC Grand Master

GTS-t VSPEC

Posted
Posted

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.

Link to comment
https://www.sau.com.au/forums/topic/87514-cam-gears/#findComment-1581260
Share on other sites
caminperth Grand Master

caminperth

Posted
Posted

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.

Link to comment
https://www.sau.com.au/forums/topic/87514-cam-gears/#findComment-1582157
Share on other sites
GTS-t VSPEC Grand Master

GTS-t VSPEC

Posted
Posted

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.

Link to comment
https://www.sau.com.au/forums/topic/87514-cam-gears/#findComment-1582661
Share on other sites
mitchy_ Grand Master

mitchy_

Posted
  • Author
Posted
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? :)

Link to comment
https://www.sau.com.au/forums/topic/87514-cam-gears/#findComment-1584014
Share on other sites
ossie_21 Grand Master

ossie_21

Posted
Posted

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!

Link to comment
https://www.sau.com.au/forums/topic/87514-cam-gears/#findComment-1584370
Share on other sites
GTS-t VSPEC Grand Master

GTS-t VSPEC

Posted
Posted
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.

Link to comment
https://www.sau.com.au/forums/topic/87514-cam-gears/#findComment-1585217
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      Mistakes were made, my R34 Story

      By MBS206 · Posted

      The oil pressure sensor for logging, does it happen to be the one that was slowly breaking out of the oil block? If it is,I would be ignoring your logs. You had a leak at the sensor which would mean it can't read accurately. It's a small hole at the sensor, and you had a small hole just before it, meaning you could have lost significant pressure reading.   As for brakes, if it's just fluid getting old, you won't necessarily end up with air sitting in the line. Bleed a shit tonne of fluid through so you effectively replace it and go again. Oh and, pay close attention to the pressure gauge while on track!
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      I don't know it is due to that. It could just be due to load on track being more than a dyno. But it would be nice to rule it out. We're talking a fraction of a second of pulling ~1 degree of timing. So it's not a lot, but I'd rather it be 0... Thicker oil isn't really a "bandaid" if it's oil that is going to run at 125C, is it? It will be thicker at 100 and thus at 125, where the 40 weight may not be as thick as one may like for that use. I already have a big pump that has been ported. They (They in this instance being the guy that built my heads) port them so they flow more at lower RPM but have a bypass spring that I believe is ~70psi. I have seen 70psi of oil pressure up top in the past, before I knew I had this leak. I have a 25 row oil cooler that takes up all the space in the driver side guard. It is interesting that GM themselves recommend 0-30 oil for their Vette applications. Unless you take it to the track where the official word is to put 20-50w oil in there, then take that back out after your track day is done and return to 0-30.
    • PranK
      My new to me M35 Stagea wagon

      By PranK · Posted

      Nice, looks great. Nice work getting the factory parts also. Never know when you'll need them.
    • Chupapy
      New r33 owner

      By Chupapy · Posted

      Thanks @jtha7 I will have a look around tomorrow but it is a prick of a spot. These are some photos i tried taking 
    • GTSBoy
      Mistakes were made, my R34 Story

      By GTSBoy · Posted

      I take it that the knock retard is from bearings tapping a little tune? Thicker oil is a fragile bandaid. You need a much bigger oil cooler and probably the bigger pump being discussed.
×
×
  • Create New...