Forced Induction Discussion of turbos , superchargers , and nitrous upgrades on the G35

GT Motorsports Turbo/NA spec camshafts

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Old Oct 24, 2006 | 06:02 PM
  #1  
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GT Motorsports Turbo/NA 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
 
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Old Oct 24, 2006 | 07:35 PM
  #2  
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sounds exciting.....when are the revup cams coming out???
 
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Old Oct 24, 2006 | 08:27 PM
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Those are still in R&D and to be released at a later date. As soon as we come closer to releasing them we will let you guys know

Any questions please feel free to PM me.

-George
GT Motorsports
 
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Old Oct 24, 2006 | 08:56 PM
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where would the cams peak at (stock heads with aftermarket springs and shims) for N/A applications
 
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Old Oct 25, 2006 | 09:15 PM
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awesome stuff!
 
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Old Oct 26, 2006 | 02:53 AM
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how much u asking for the NA one? the specs look similar to nismo cams
 
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Old Oct 27, 2006 | 07:31 PM
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Which cam would be better for the stillen Stage 4 SC, with a ported SC? I have headers on the car that cost me boost. Will the cams help with the headers on or work better if i remove the headers.
I am hoping that the cams will work with the headers and make mopre rwhp.
 
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Old Feb 20, 2007 | 04:41 AM
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Bump for RevUp info!
 
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Old Feb 20, 2007 | 12:10 PM
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will these give off check engine lite and have rough idles?
 
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Old Feb 20, 2007 | 12:30 PM
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Sorry

I trying to understand where you picked up on the cam spec.'s?

The specs on your cams are very misleading

The overlap numbers look very strange. Should be around 110-116 degrees.
Plus the duration numbers look very, very aggressive. Factory rev-up cams spec.'s are 428 lift on intake 409 exhaust.
 
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Old Mar 12, 2007 | 06:31 PM
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TTT again for Sam's reply!?
 
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Old Mar 12, 2007 | 09:52 PM
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Bump for update on RevUp cams.

Are aftermarket valve springs and shim required to use these?

Also, do you need to bump up the idle RPMs?
 
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