GTM 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 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.

Specifications:

Stage1:

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

Stage 2:

272 degrees @ .012"

232 degrees @.050"

11.00mm Valve lift intake and exhaust

Stage 3:

288 degrees @ .012"

245 degrees @ .050"

11.50mm Valve lift intake and exhaust

GTM Supercharger Spec camshafts for the VQ35DE

The 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.

Specifications:

Stage1:

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

Stage 2:

282/272 degrees @ .012"

240/232 degrees @ .050"

11.50mm/11.00mm Valve lift (intake/exhaust)

Stage 3:

302/292 degrees @ .012"

256/250 degrees @ .050"

11.50mm/11.00mm Valve lift (intake/exhaust)