GT Motorsports Turbo and NA/SC Spec Camshafts
10-24-2006, 12:22 PM
#1
GT Motorsports Turbo and NA/SC Spec Camshafts
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
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
Last edited by Sam@GTM; 10-24-2006 at 12:25 PM.
10-24-2006, 12:39 PM
#5
Registered User
iTrader: (2)
Join Date: Jan 2004
Location: NW Ohio
Posts: 1,331
Likes: 0
Received 0 Likes
on
0 Posts
How smooth will the idle be with turbo cams? Will an idle bump be required? Will they require valve springs?
Last edited by BrianLG35C; 10-24-2006 at 12:47 PM.
Trending Topics
10-24-2006, 01:40 PM
#8
The Turbo cams will idle smooth since they have less overlap than stock, the NA cams will be a bit more aggresive and might require and idle bump, We can do that if needed.
These cams are safe to use with your stock valvetrain although if you want to increase the rev limiter we recommend upgrading the valvetrain but if you plan to stay within the factory rev limiter you should be fine
-George
GT Motorsports
These cams are safe to use with your stock valvetrain although if you want to increase the rev limiter we recommend upgrading the valvetrain but if you plan to stay within the factory rev limiter you should be fine
-George
GT Motorsports
10-24-2006, 01:41 PM
#9
Originally Posted by Rickdogg
hmmmmmm cage then possibly swing by GT soon since they are down the street from me 
-George
GT Motorsports
10-24-2006, 04:23 PM
#13
Originally Posted by QuadCam
any word on cams for the revup engines?
-George
GT Motorsports
10-24-2006, 05:14 PM
#15
Registered User
iTrader: (5)
Join Date: Jul 2004
Location: Little South of the ATL
Posts: 1,027
Likes: 0
Received 0 Likes
on
0 Posts
Man O Man, Sam/George are pumpimg parts out for the G/Z's like candy now. Great job guys i believe i am getting a better idea who will be the manufacture of my FI build parts. Keep up the great work.
10-24-2006, 06:00 PM
#17
how high of an idle bump are we talking about for th NA/sc cams? Also, will the engine idle similar to stock or will it still be shakey and will it throw check engine lite? I need something where I can pass smog bc its not like it's a walk in a park to take them out each time I need to pass emissons in ca 
10-24-2006, 07:52 PM
#20
Sponsor
builtZmotors
builtZmotors
iTrader: (21)
Join Date: Jul 2004
Location: Albuquerque, NM
Posts: 2,780
Likes: 0
Received 0 Likes
on
0 Posts
Sam,
I've been holding my breath for these this entire year, glad you have finally got the specs dialed in...
looking forward to these being our cam of choice for most of our motor builds
-TODD
I've been holding my breath for these this entire year, glad you have finally got the specs dialed in...
looking forward to these being our cam of choice for most of our motor builds
-TODD