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OS Giken cam gear setting on GTR

ricknismo

By ricknismo,
in Engines & Forced Induction

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proengines Rising Star

proengines

Posted
Posted

It all depends on what else you have done. Be careful as a little change on the cam timing can make quite a big change to the AFR. Your best bet is to get the car on a dyno and work in small steps, monitoring the air/fuel ratios.

djr81 Grand Master

djr81

Posted
Posted
Just trying to clarify setting cam gears up....

what is the ideal setting?

4 advance on inlet side and 2 retard on exhaust?

If not what then?

thanks

and are these figure, cam gear figures or crank figures as 1 degree on cam is 2 on crank

Other way around. Most people have had success with about two degrees advance on the inlet & four degrees retard on the exhaust, but it varies from car to car. What you are going to be doing is increasing the cam overlaps - something Nissan couldn't do because of the emissions problems this gives.

1 degree on the cam is two degrees on the crank. Measure everything in crank degrees & don't forget to compensate with the ignition timing when you are done.

Sumo Mentor

Sumo

Posted
Posted

I would get it on a dyno mate, even if you have to drop the front tailshaft.

I would rather be sure then have someone who might have got their settings mixed up and end up with bigger problems (not having a go at anyone in this thread).

Cheers

Sumo

djr81 Grand Master

djr81

Posted
Posted
So...Can we get another to confirm its 2 degrees advance on plenum side and 4 retard on exhaust????

Yes, that is correct. Get it done on a dyno, because results vary from car to car depending on the tune and/or setup. The +2/-4 degrees gives you a good idea on where to start looking.

  • 9 months later...
warriorbrawl Contributor

warriorbrawl

Posted
Posted

I am wondering what type of tune my car has been steup for.

I had a look at the os giken gears and exhaust is retard 4 increments and inlet is adv 6 increments does this sound right to you guys?

What sort of effect would this have on the tune.

I have read that inlet is normally around 2 increments this seems very different.

The car goes really well just interested if it is setup to bring on boost or what?

mods rb26, exhaust, filters ,PFC 15psi, os cam gears.

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