Help with cam grind
08-04-2008, 05:44 PM
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Help with cam grind
Hey guys...
Blah blah, the guy with the Saab, blah
Anyways, I'm doing a 400whp build and I figured i'd come to you guys when it comes to things like CAMS. I'm not very good with figuring out cams, I know a few things about duration and lift, but not very much. I sent an email over to JBP today asking them about a cam grind.
The car is turbo, it's going to be using a GT3071R, valvetrain, forged rods/pistons, *cams*, and then headgasket/headstuds, 630cc injectors and the walbro 255lph fuel pump with 6-7gph of methanol injection. That's pretty much the meat of the build.
For reference, here is the stock cam profile for the motor:
What should I be looking for as far as a new grind?
Blah blah, the guy with the Saab, blah
Anyways, I'm doing a 400whp build and I figured i'd come to you guys when it comes to things like CAMS. I'm not very good with figuring out cams, I know a few things about duration and lift, but not very much. I sent an email over to JBP today asking them about a cam grind.
The car is turbo, it's going to be using a GT3071R, valvetrain, forged rods/pistons, *cams*, and then headgasket/headstuds, 630cc injectors and the walbro 255lph fuel pump with 6-7gph of methanol injection. That's pretty much the meat of the build.
For reference, here is the stock cam profile for the motor:
Will this do it, Frosty?
http://www.saabcentral.com/forums/s...736&postcount=2
Intake 235 deg
Exhaust 240 deg
Ehhh, wait a minute. I got the WIS here. (In case you want to grind your own).
Intake lift 5.75544 mm
Intake open/close 14 BTDC / 41 ABDC
Exhaust lift 5.8703 mm
Exhaust Open/Close 47 BBDC / 13 ATDC
The above data is specific to the 2.0T.
The WIS also lists this spec, which appears to apply to all 4 cylinder motors:
Cam Lift, Inlet Valve 9.70 mm
Cam Lift, Exhaust Valve 9.90 mm
The difference between compressed tappets and expanded tappets is about 2 mm. So, I'm not sure where some of that cam data comes from.
http://www.saabcentral.com/forums/s...736&postcount=2
Intake 235 deg
Exhaust 240 deg
Ehhh, wait a minute. I got the WIS here. (In case you want to grind your own).
Intake lift 5.75544 mm
Intake open/close 14 BTDC / 41 ABDC
Exhaust lift 5.8703 mm
Exhaust Open/Close 47 BBDC / 13 ATDC
The above data is specific to the 2.0T.
The WIS also lists this spec, which appears to apply to all 4 cylinder motors:
Cam Lift, Inlet Valve 9.70 mm
Cam Lift, Exhaust Valve 9.90 mm
The difference between compressed tappets and expanded tappets is about 2 mm. So, I'm not sure where some of that cam data comes from.
08-04-2008, 06:37 PM
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it's going to be custom tuned on the dyno by Nordic in a few months, we don't have HPT software for this ECU
The A/R of the turbo is 0.64, internally wastegated with a T3 turbine housing. I'm guessing the boost will be somewhere near 23psi
can you guys throw links at me?
The A/R of the turbo is 0.64, internally wastegated with a T3 turbine housing. I'm guessing the boost will be somewhere near 23psi
can you guys throw links at me?
08-04-2008, 09:57 PM
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08-05-2008, 10:29 AM
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08-05-2008, 10:45 AM
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I would say something similar to this. Slightly longer duration than stock for higher rpm use, near similar overlap with much better lift.
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