HKS 264/9.0 Exh cam and adj cam gear?

[Steve]

Hi all,

Just wondering if anybody has put an adjustable exhaust cam gear on AFTER having had a HKS 264/9.0 exh cam gear fitted?

The main thing I was interested in knowing is if there was a noticeable difference after putting the cam gear on.

I have heard that some manufacturers dial in the cams during the manufacture, negating any benefit that would be associated with an adjustable cam gear

If this is so, it looks like I will have a HKS adj cam gear for sale

Any help much appreciated

Cheers

Steve

[T0nyGTSt]

Steve,

This is what I'm doing (or done!) right now.

OS Giken exhaust cam gear (dialed up to a few degrees retard). Standard cams.

Later I'll most like go Tomei/HKS in./ex. cams + ex. cam gear.

Discard the in. gear and old OS Giken cam.

T.

[sidewaymambo]

I believe different turbo will prefer different rpm range and the overlap the cams, don't quote me on this, hense I discovered this from my trust td06 setup ,and when the car on dyno we discovered:

[264ex cam + stock ex cam gear] v.s [264 ex cam with ex cam gear(4 degree retared)] only happen after 6000 rpm, powerband expanded..about 12kw..the cam still not dialed in at its best setup, so that's a rough guide..car will retune next tuesday, so will let you know.

[Sydneykid]

Hi Steve, I think you know of our experiences, generally we get a power increase plus moving it up and down in the rpm range from adjusting the camshaft timing. This is certainly always true of standard camshafts, particularly when other things have been upgraded substantially.

But (as you find in all things automotive) there are exceptions, our RB25DET with the Tomei Poncams is the most recent. I could get nothing (not 1 rwkw) from adjusting the timing from the standard Tomei position.

My suggestion in your case (as you have already said) would be to try it, you can always sell the adjustable pulley afterwards if it is not required. Please let us know how you get one, as I am about to do similar with our circuit race engine.

Sorry I don't have a definitive answer

[Steve]

Thanks for all the replies, sounds like it will definately be worth giving it a go then. No great loss in trying.

I will post up the results (just waiting on my plenum) when I get it all fitted and dynoes.

Sidewaymambo, please do post let us know.

[Merli]

Steve, whether or not they dialed the cam gear in perfectly from factory or not is irrelevant for all of us isn't it?

Everyone who has replied to this thread has upgraded turbos, and in most cases, MAJOR upgrades... Different turbos need different timing values to extract the best performance, and even if you had the stock turbo, you can play with bringing the turbo on boost faster, or choosing to sacrifice low end response for top end power...

I put an HKS exhaust cam gear on my GTS whilst having the PowerFC re-tuned, so I can't give you a pure power increase figure for the cam gear alone, but I *can* tell you this:

Before Cam Gear: 1.2 bar @ 4200rpm

After Cam Gear: 1.2 bar @ 3900rpm

For that alone, I think it was worth every cent, plus more

[rb20-calais]

I was actually thinking of getting cams to bring my car on boost earlier. Maybe all I need is the gears. Is it worth getting both inlet and exaust on an RB20 or should I just do the exaust?

Evan

[Steve]

Merli, nice results, where did your timing gear end up set out of interest?

I already have a HKS GT3037 turbo, larger injectors...blah blah

I have the cams (256/8.8in, 2649.0exh) sitting at home waiting patiently, but if the cam gear wasnt going to make bugger all difference, that $200 dollars saved, so better in my pocket than HKS's Never hurts to be sure.