996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Modified OEM head/cams vs GT3 Head/cams

Old Jul 10, 2010 | 01:43 AM
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Modified OEM head/cams vs GT3 Head/cams

Lets say a car has 3.8 w/ported OEM head,bigger valves, regrind cams and gt35 vs another car has also 3.8 w/ GT3 Head/cams and gt35

What kind of hp/tq differance we should see?? is it really worth it extra cash on the gt3 head and cams??
 
Old Jul 10, 2010 | 03:10 AM
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I have gt3 world challenge cup head with actual gt3 cams along with 35rs but with stock displacement.
Heads and cams are a little too big fort set up.
The other way is to redo a stock head and regromd stock cams to gt3 specs. That with a 3.8 works well
Boost for boost it's probably another 100 hp.
I really think that a good rod jon wig headstuds is just about right and one can put down 850rwhp without a problem and that's on stock displacement.
 
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Old Jul 10, 2010 | 10:11 AM
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Originally Posted by MARKSKI@911tuning
I have gt3 world challenge cup head with actual gt3 cams along with 35rs but with stock displacement.
Heads and cams are a little too big fort set up.
The other way is to redo a stock head and regromd stock cams to gt3 specs. That with a 3.8 works well
Boost for boost it's probably another 100 hp.
I really think that a good rod jon wig headstuds is just about right and one can put down 850rwhp without a problem and that's on stock displacement.
Thanks Mark So power2price redo a stock head and regromd stock cams to gt3 specs would be way to go??

Who else ran gt3 head/cams??? Peter, RobMD, jap991tt, artz....???
 
Old Jul 10, 2010 | 02:42 PM
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Any one??

I wonder if cjv/Chad could chime in
 
Old Jul 10, 2010 | 03:15 PM
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not more then maybe 1 or two guys ever did an actual gt3 variant head and cams and ran it... I know of only one other car....
 
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Old Jul 10, 2010 | 03:26 PM
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EVOMS turbocharged a 996 GT3 this could be another option.
Robert
 
Old Jul 10, 2010 | 04:25 PM
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Originally Posted by robmd99
EVOMS turbocharged a 996 GT3 this could be another option.
Robert
WOW!!

I though ur car has gt3 head and cams
 
Old Jul 10, 2010 | 04:28 PM
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Originally Posted by MARKSKI@911tuning
not more then maybe 1 or two guys ever did an actual gt3 variant head and cams and ran it... I know of only one other car....
artz car maybe??

So most of +1000rwhp has ported heads and regrind cams?

BTW....iWhat is McKenzie heads???
 
Old Jul 10, 2010 | 05:12 PM
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I have ported and polished heads with sport cams from EVOMS. I think they work well
 
Old Jul 10, 2010 | 05:27 PM
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Originally Posted by jags911tt
I have ported and polished heads with sport cams from EVOMS. I think they work well
Awesome
 
Old Jul 10, 2010 | 05:32 PM
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I have CNC ported stock heads with bigger valves that out flowed the GT3 heads i had previously by 15% but was really hard to decipher the difference in real world results......for now.I will probably see the benefits down the road with a larger setup.
 
Old Jul 10, 2010 | 05:59 PM
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Originally Posted by Shotcaller
artz car maybe??

So most of +1000rwhp has ported heads and regrind cams?

BTW....iWhat is McKenzie heads???
I dont think he had them...
Mckenzie is a company that does the porting/valve job, etc etc.... on stock heads and or whatever you send...
99% of guys use stock heads and some variant of stock cams and or versions in spec with gt3...
this is my gt3 race head and cams... and its on the car for 4 years... however, with a 3.6L the cams come on too late and thus I don't have the most desirable 1/4 set up....



 
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Old Jul 10, 2010 | 06:44 PM
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Originally Posted by joetwint
I have CNC ported stock heads with bigger valves that out flowed the GT3 heads i had previously by 15% but was really hard to decipher the difference in real world results......for now.I will probably see the benefits down the road with a larger setup.
Very impressive!!

EVOMS did the port job?
 
Old Jul 10, 2010 | 06:46 PM
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Originally Posted by MARKSKI@911tuning
I dont think he had them...
Mckenzie is a company that does the porting/valve job, etc etc.... on stock heads and or whatever you send...
99% of guys use stock heads and some variant of stock cams and or versions in spec with gt3...
this is my gt3 race head and cams... and its on the car for 4 years... however, with a 3.6L the cams come on too late and thus I don't have the most desirable 1/4 set up....



Thanks u very much M!!
 
Old Jul 10, 2010 | 11:08 PM
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Originally Posted by Shotcaller
Lets say a car has 3.8 w/ported OEM head,bigger valves, regrind cams and gt35 vs another car has also 3.8 w/ GT3 Head/cams and gt35

What kind of hp/tq differance we should see?? is it really worth it extra cash on the gt3 head and cams??

The 996tt heads can be opened up with larger valves/ports. The 996tt cam housings will not accept as large (radical) a cam as the GT3 cam housings will.

GT3 cams are not really the best cams for a turbo motor. They were designed for a NA motor and the lift and duration is not ideal.
 

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