LS2 - more TORQUE needed at 4000 rpm !
07-31-2008, 06:11 PM
#1
Safety Car
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Location: Miami FL
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2020 C6 of the Year Finalist - Unmodified
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16,'17,'18-'19-'20-'21-'22
LS2 - more TORQUE needed at 4000 rpm !
Hey guys,
When my warranty runs out next spring I want to tweak my engine a bit. My goal is lots more torque between 3000 rpm and 4000 rpm, to make her JUMP on the highway without always downshifting two or three gears. I am not interested in setting dyno records at 6500 rpm, but have no aversion to high horsepower at the upper rpm ranges. I do want to preserve good street driveability, such as the ability to cruise in any gear from 2nd to 5th at 1500 rpm.
To that end here is my draft plan:
Heads: ported and milled 243’s like the Cartek Stage 2X, for about 11.5 to 1 compression, and dual springs for the upgraded camshaft.
Camshaft: not too radical. The stock LS2 is 204°/211° - .525”/.525” 116°LSA, so I am looking at something like the Cartek M-cam: 218°/224° - .560”/.560” 114°LSA. Rocker rollers and the correct length pushrods too.
FAST 92 intake manifold ported to the Cartek 2X heads. I already have Cory’s latest ported throttle body.
LG Pro headers, with cats, ceramic coated, running through the Route 66 mufflers already on my car.
Underdrive pulley and a dyno tune by one of our great Florida tuners.
Note I am NOT looking at the L92-L76 conversion, since I think I will not need the extra flow capacity in my target 3000 – 4000 rpm range. I am also not looking at changing the 3.42 axle in my MN6 car. I like where the gears split right now, and with the extra torque I am planning, steeper gears would be superfluous.
Superchargers are off the table also since I want to go UP in compression, and enjoy the extra fuel economy when my foot is not buried in the firewall.
I welcome and constructive comments and suggestions, and am prepared to ignore any non-helpful replies.
Thanx in advance
When my warranty runs out next spring I want to tweak my engine a bit. My goal is lots more torque between 3000 rpm and 4000 rpm, to make her JUMP on the highway without always downshifting two or three gears. I am not interested in setting dyno records at 6500 rpm, but have no aversion to high horsepower at the upper rpm ranges. I do want to preserve good street driveability, such as the ability to cruise in any gear from 2nd to 5th at 1500 rpm.
To that end here is my draft plan:
Heads: ported and milled 243’s like the Cartek Stage 2X, for about 11.5 to 1 compression, and dual springs for the upgraded camshaft.
Camshaft: not too radical. The stock LS2 is 204°/211° - .525”/.525” 116°LSA, so I am looking at something like the Cartek M-cam: 218°/224° - .560”/.560” 114°LSA. Rocker rollers and the correct length pushrods too.
FAST 92 intake manifold ported to the Cartek 2X heads. I already have Cory’s latest ported throttle body.
LG Pro headers, with cats, ceramic coated, running through the Route 66 mufflers already on my car.
Underdrive pulley and a dyno tune by one of our great Florida tuners.
Note I am NOT looking at the L92-L76 conversion, since I think I will not need the extra flow capacity in my target 3000 – 4000 rpm range. I am also not looking at changing the 3.42 axle in my MN6 car. I like where the gears split right now, and with the extra torque I am planning, steeper gears would be superfluous.
Superchargers are off the table also since I want to go UP in compression, and enjoy the extra fuel economy when my foot is not buried in the firewall.
I welcome and constructive comments and suggestions, and am prepared to ignore any non-helpful replies.
Thanx in advance
07-31-2008, 07:10 PM
#2
Former Vendor
Member Since: Aug 2005
Location: Lewisville TX
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St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
How about this?
Show above is stock 2006 M6 Z51 and our bolt on package
That is before a camshaft or any cylinder head change. There is NO underdrive pulley, NO ported throttle body. 93 pump gas.
If you were wanting to take this one step farther, I might suggest a G5X1 or G5XE camshaft, which focus more on mid-range torque.
Let me know any way I can help!
Show above is stock 2006 M6 Z51 and our bolt on package
- LG Pro Long Tube headers w/Z06 3" rear pipes
- Borla Z06 Touring cat back
- FAST intake (un-ported)
- HallTech intake
- LG Dyno Tune
That is before a camshaft or any cylinder head change. There is NO underdrive pulley, NO ported throttle body. 93 pump gas.
If you were wanting to take this one step farther, I might suggest a G5X1 or G5XE camshaft, which focus more on mid-range torque.
Let me know any way I can help!
07-31-2008, 11:01 PM
#4
Safety Car
At 11.5:1 compression, a 224 cam would be better IMO. A 224/228 114 could go in with no advance, have a high DCR and at -2 overlap would have good manners at 1000 rpm. Given your focus on Torque, a reverse split 228/224 114 +2 would do very nicely.
AFR 205 heads would be worth considering too.
AFR 205 heads would be worth considering too.
07-31-2008, 11:02 PM
#5
Le Mans Master
Ultimate low end torque = Magnacharger. Anything else is a pretender. Cam/heads etc don't measure up. Expensive, but the results are there. Pulls like a built big inch big block. My MP122 on top of a 6.0L LQ4 in a half ton truck with a few bolt ons will out pull lots of vettes. Thought about adding a maggie to my '08, but didn't want to spend the $.
08-01-2008, 10:20 AM
#6
Safety Car
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2020 C6 of the Year Finalist - Unmodified
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16,'17,'18-'19-'20-'21-'22
Thanx, Anthony and Ragtop99. Looks like I am heading in the right direction (for MY needs) and just need to fine-tune (pun intended) my thinking. 
