Originally Posted by Sam@GTM

We are in the process of designing our site, so please bear with us. Until then, we will make the introduction of our products here.

Now: GT Motorsports® Camshafts

Our cams have gone through a lengthy and careful design process. We will be offering two different designs (both for the non-revup 2003-2004 model year cars for the time being; the latter design is currently in development).

1. GT Motorsports® Turbo Spec camshafts for the VQ35DE
2. GT Motorsports® Stage I NA/Supercharger camshafts for the VQ35DE

GT Motorsports® Turbo Spec camshafts for the VQ35DE
The GTM® Turbo Spec cams were designed by taking a complex set of variables into account. Turbocharger compressor maps and the flow characteristics of the VQ35DE were integral in developing the cam profile. The very specifications that were attained (following several revisions and countless computerized simulation trials) allow for the maximum possible volumetric efficiency over the broadest possible rpm range. Given the high exhaust manifold pressures (that exceed intake/boost pressures) found on turbocharged systems, volumetric efficiency, aside from duration/lift, is also dependent on internal exhaust gas recirculation, which is a function of intake/exhaust cam overlap. The specifications below minimize that overlap, while retaining the highest practical cam duration, to yield the highest possible performance.

Specifications
Intake: 256 deg (stock 238)
Exhaust: 264 deg (stock 240)
Lift: 0.423” (intake and exhaust)
Overlap: 18 deg (at 0.045” lift) – less than stock


GT Motorsports® Stage I NA/Supercharger Spec camshafts for the VQ35DEThe challenges of designing NA cams are much different from turbo cams. Much greater emphasis was placed on intake resonance, which has proportionally greater effect on performance than on turbocharged vehicles. Our research showed that to maximize volumetric efficiency, an asymmetrical lift for intake and exhaust was required, in addition to the asymmetrical cam duration. It was also found that a higher lift on the intake side paired with a slightly lower exhaust side lift, achieved the greatest performance gain on the broadest possible rpm range. Higher overlap in this case is possible, as reversion is not as much of an issue.

Specifications
Intake: 264 deg (stock 238)
Exhaust: 256 deg (stock 240)
Lift: 0.435” (intake) and 0.423” (exhaust)
Overlap: 22 deg (at 0.045” lift) – more than stock


Note: the cams are cut from chill cast billet (same as the OEM Nissan camshafts) and ground on factory centerline for perfect precision.

Availability:
Now
Prices:
1. GT Motorsports® Turbo Spec camshafts for the VQ35DE: $1165 (MSRP)
2. GT Motorsports® Stage I NA/Supercharger Spec camshafts for the VQ35DE: $1165 (MSRP)

Thank you.

Next: GT Motorsports® 6MT chromoly billet gears

Originally Posted by GurgenPB

You can manufacture the cam to move the entire profile forward/backward (which retards/advances it's opening for the exhaust cam, opposite for the intake cam) relative to it's position markers (located on the aft plate). So yes, you do have longer duration, but it extends more into the intake/exuast strokes then the stock cams do, hence less overlap. This would be akin to having an adjustable cam sproket like they do on so many cars. THe VVT can't compensate, since it can only go by the cam position gaps on the signal plate of the cam, which are in an unchanged position.

Originally Posted by Nathan

This is not a critisism of your camshafts but there is no known way that your turbo spec camshafts have less overlap than stock.

The specs of both the Inlet & Exhaust cams show a larger duration than stock. (I am assuming that these comparison durations are measured at the same lift)
As the exhaust cam is fixed (no VTC) the stock ex cam has a closing position of 8 deg ATDC, your cam has 24 deg more duration so the closing position of your cam will be aprox 20 deg ATDC.

The stock Inlet cam has a static opening position of -6 deg BTDC (that is 6 deg ATDC) Your inlet cam has 18 deg more duration than stock & in the static postion your cam would open aprox 3 deg BTDC.

Originally Posted by BrianLG35C

Are the turbo cams available/in stock from GTM or their vendors now?

Originally Posted by BrianLG35C

Any details on their head packages yet?

Originally Posted by redline350ZZ

I'm waiting for my Turbo cams.

Originally Posted by Sam@GTM

No worries, not taking this as criticism, I will shed some light on your comments later due to my current time restraint .