What cams are you turbo guys running?
03-19-2006, 02:08 PM
#1
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What cams are you turbo guys running? Hi, i just orderd a PTK kit and im tryin to gather parts and now i need a cam. I got the t-76 upgrade turbo and im gonna run stock 6.0 heads. so what cam do you reccomend? and what is everyone else using?
03-19-2006, 08:37 PM
#6
I have a PTK setup with a 76GTS turbo. My CR is about 8.5:1. I have an M6 car. Cam Motion spec'd and ground the cam for my ride as follows:
Duration @ .050: 223 Intake & 219 Exhaust
Lobe Separation: 115
Intake Centerline: 112
Lift: .576 Intake & .561 Exhaust
Duration @ .050: 223 Intake & 219 Exhaust
Lobe Separation: 115
Intake Centerline: 112
Lift: .576 Intake & .561 Exhaust
Last edited by Frost; 03-19-2006 at 10:00 PM.
03-19-2006, 09:39 PM
#7
Mine is 224/236-114, +0 adv. .605"/.593"
Another that made good power was 236/242-112.
Yet another that made good power was 224/224-113.
I've been looking at alot of turbo combinations to try to get an idea of what cams work and which ones don't. The basic trends seem to suggest:
1) Intake duration determines power and rpm range more than anything else. Intake duration versus rpm range is similar to N/A motors. Be sure to keep the rpm range low enough so the turbo is still efficient.
2) Exhaust duration seems to have little effect. Keep it +/- 10 degrees from the intake duration. (i.e. if the intake is 224, don't go under 214 or over 234 on the exhaust)
3) Overlap should be less than 5 deg at .050" unless backpressure is very low (<1.5 x boost). If backpressure is very low, more overlap will only help power.
Another that made good power was 236/242-112.
Yet another that made good power was 224/224-113.
I've been looking at alot of turbo combinations to try to get an idea of what cams work and which ones don't. The basic trends seem to suggest:
1) Intake duration determines power and rpm range more than anything else. Intake duration versus rpm range is similar to N/A motors. Be sure to keep the rpm range low enough so the turbo is still efficient.
2) Exhaust duration seems to have little effect. Keep it +/- 10 degrees from the intake duration. (i.e. if the intake is 224, don't go under 214 or over 234 on the exhaust)
3) Overlap should be less than 5 deg at .050" unless backpressure is very low (<1.5 x boost). If backpressure is very low, more overlap will only help power.
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03-20-2006, 12:03 PM
#8
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Interesting points, I have been asking about #2 and one of the reasons for folks not to go big on exhaust duration is backpressure. This is more of an issue for single turbo setups.
I've got a used W2W/ Cam Motion grind here, 237/231//115. Feeling is that it should come up on boost better than a traditional split, has lower exhaust duration to help keep backpressure down, but should still make nice power. Mightymouse made over 800rwhp this this cam at one point. I'm running stock cubes so I did not want to go any bigger.
I currently run a 236/246/114 blower cam.
I've got a used W2W/ Cam Motion grind here, 237/231//115. Feeling is that it should come up on boost better than a traditional split, has lower exhaust duration to help keep backpressure down, but should still make nice power. Mightymouse made over 800rwhp this this cam at one point. I'm running stock cubes so I did not want to go any bigger.
I currently run a 236/246/114 blower cam.