H/C Goals
H/C Goals I have an 02 M6 SS that put down 326/344 stock. Here are some goals I have come up with for a H/C swap in order of importance.
1. No surging or bucking between 1200 and 2000 RPMs (DD).
2. Smooth idle. It can be loud I just want to minimize the lope.
3. 420+/400+ at the wheels.
4. In the 11s at 4500' altitude. (will have to get a new rearend/clutch first)
The basic combo I have come up with consists of:
PRC LS6 heads but I haven't decided on the valve sizes yet.
228/232 .639/.643 110 LSA cam.
.04 Cometics
New pushrods, timing chain and possibly lifters
If I'm doing this right that should put me at 11 SCR and 8.49 DCR. I'll also be putting on some QTP headers and dual cutouts. The car already has an underdrive pulley.
Does this sound reasonable? Am I doing the CRs correctly?
I also want to know if I get the bigger valves if the PTV clearance will be OK and how much power the bigger valves are worth.
Thanks in advance.
1. No surging or bucking between 1200 and 2000 RPMs (DD).
2. Smooth idle. It can be loud I just want to minimize the lope.
3. 420+/400+ at the wheels.
4. In the 11s at 4500' altitude. (will have to get a new rearend/clutch first)
The basic combo I have come up with consists of:
PRC LS6 heads but I haven't decided on the valve sizes yet.
228/232 .639/.643 110 LSA cam.
.04 Cometics
New pushrods, timing chain and possibly lifters
If I'm doing this right that should put me at 11 SCR and 8.49 DCR. I'll also be putting on some QTP headers and dual cutouts. The car already has an underdrive pulley.
Does this sound reasonable? Am I doing the CRs correctly?
I also want to know if I get the bigger valves if the PTV clearance will be OK and how much power the bigger valves are worth.
Thanks in advance.
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Joined: Feb 2003
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That cam would only have 5* of overlap @.05", so surging shouldn't really be an issue with a good tune.
Big cams are all in the tune, and matching the converter/gears properly. Get steeper gears with the new rear end and you should be golden for drivability.
As for your goal of 11s, if you get a good launch (tires, rear, clutch, some suspension) and shift well in good weather you should make it. The only way to know what it will run for sure is to go do it.
Big cams are all in the tune, and matching the converter/gears properly. Get steeper gears with the new rear end and you should be golden for drivability.
As for your goal of 11s, if you get a good launch (tires, rear, clutch, some suspension) and shift well in good weather you should make it. The only way to know what it will run for sure is to go do it.
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I think you'll exceed your power and performance goals but ET's will depend on your tires/driving skills. Drivability at low rpm should be pretty good once the car is tuned.
Is this the same cam PatrickG is using?
Is this the same cam PatrickG is using?
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Verdad Gallardo OK let me ammend what I posted..I think that unless you get some taller gears that you will have surging..cams on the other side of 230 really like the 4.10's with a 6 speed..at least with my experience that is what I have seen and my car is tuned by a good tuner..my surging went away with the installation of the 4.10 gears..
Originally Posted by ShevrolayZ28
What size combustion chambers?
This is similar to Pat G's cam but one size up on each lobe. I could bring down the size of the exhaust lobe to 228 but the intake lobe is just right to hit the 8.5 DCR (if my calculations are correct). Maybe someone can chime in as to whether or not I should use the smaller exhaust lobe.
Last edited by MISERICORDIA; Jul 18, 2006 at 10:47 AM.
Originally Posted by slt200mph
OK let me ammend what I posted..I think that unless you get some taller gears that you will have surging..cams on the other side of 230 really like the 4.10's with a 6 speed..at least with my experience that is what I have seen and my car is tuned by a good tuner..my surging went away with the installation of the 4.10 gears..
Originally Posted by MISERICORDIA
Did the gears make the surging go away or did the gears just make it so you weren't at the RPMs where there was surge for long enough to notice?
The gears changed the rpms and thus change the way the car drove and made the surg go away.. (233\233 dur.) the cam was a cam that made its muscle between 4000-7000..great for the track..street manners were much better with the taller gears..now I have a cam like Patrick G's at this time..I dont go to the track..the power under the curve is most important to me because that is where I live..no more winding to 7k..no need for it now..
Originally Posted by MISERICORDIA
I think just the stock 64.45 that comes with the LS6 heads.
This is similar to Pat G's cam but one size up on each lobe. I could bring down the size of the exhaust lobe to 228 but the intake lobe is just right to hit the 8.5 DCR (if my calculations are correct).
This is similar to Pat G's cam but one size up on each lobe. I could bring down the size of the exhaust lobe to 228 but the intake lobe is just right to hit the 8.5 DCR (if my calculations are correct).
I come up with a SCR of 10.63:1 when I plug the numbers into this calc...but this calculator may be inacurate.
http://www.alantripp.com/VE%20Calcul...y%20Lookup.xls
No advance in the cam. I also get 10.63 if I don't set the deck height to -.007 instead of +.007. I think the stock pistons come out .007 (negative in the calc) but I may be wrong. Hopefully someone can clarify...