Calling PatrickG /PredatorZ - Experts??? - Please help with cam selection
Calling PatrickG /PredatorZ - Experts??? - Please help with cam selection I'm currently running a Cheatr cam and loving it, but I just added headers. As a result, I want a larger cam that more closely matches my setup. The Cheatr cam is great for roll-ons because it holds the power/torque so well towards redline. I'll be doing most of my fun from 4500-6500 rpms from a roll and want something that maximizes that range. I assume that means a higher 114 or higher LSA to bump that power further up the band. When I add the cam I plan on adding the pulley, Ported Fast and S3 TB as well... I drive my car every day and don't want the car to have stalling issues or major surging.. (that's what I love about the Cheater cam). I also have to park on the 3rd floor of a parking garage, so I don't want to have to worry about stalling either. What’s' the best cam for me?
2005 Z51 MN6
Current Mods
AFR Heads 205s
Kooks 1 3/4
(On the way S3TB and FAST)
Honker Intake
2005 Z51 MN6
Current Mods
AFR Heads 205s
Kooks 1 3/4
(On the way S3TB and FAST)
Honker Intake
To keep the stalling and surging down, you'll want to keep your overlap at a reasonable level. For best power in the 4500-6500 rpm range, you'll want your intake valve closing point to be around 45-46 degrees ABDC at .050". Since you now have headers, you don't need as early of an exhaust valve opening. To maximize the area under the curve, you'll want quite a bit narrower LSA than the CheaTR to keep your DCR close to 8.50:1.
228/232 .639/.595 111LSA 111ICL (+0)
This is just a hair bigger than my car with LSK lobe on intake and XE-R on exhaust. It has 8 degrees of overlap at .050" which means it will still be OK with a good tune. If that much overlap concerns you, I'd recommend going smaller in duration and keeping the LSA narrow.
224/228 .636/.588 111LSA 112ICL (-1)
This has 4 degrees of overlap at .050".
228/232 .639/.595 111LSA 111ICL (+0)
This is just a hair bigger than my car with LSK lobe on intake and XE-R on exhaust. It has 8 degrees of overlap at .050" which means it will still be OK with a good tune. If that much overlap concerns you, I'd recommend going smaller in duration and keeping the LSA narrow.
224/228 .636/.588 111LSA 112ICL (-1)
This has 4 degrees of overlap at .050".
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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Originally Posted by Patrick G
To keep the stalling and surging down, you'll want to keep your overlap at a reasonable level. For best power in the 4500-6500 rpm range, you'll want your intake valve closing point to be around 45-46 degrees ABDC at .050". Since you now have headers, you don't need as early of an exhaust valve opening. To maximize the area under the curve, you'll want quite a bit narrower LSA than the CheaTR to keep your DCR close to 8.50:1.
228/232 .639/.595 111LSA 111ICL (+0)
This is just a hair bigger than my car with LSK lobe on intake and XE-R on exhaust. It has 8 degrees of overlap at .050" which means it will still be OK with a good tune. If that much overlap concerns you, I'd recommend going smaller in duration and keeping the LSA narrow.
224/228 .636/.588 111LSA 112ICL (-1)
This has 4 degrees of overlap at .050".
228/232 .639/.595 111LSA 111ICL (+0)
This is just a hair bigger than my car with LSK lobe on intake and XE-R on exhaust. It has 8 degrees of overlap at .050" which means it will still be OK with a good tune. If that much overlap concerns you, I'd recommend going smaller in duration and keeping the LSA narrow.
224/228 .636/.588 111LSA 112ICL (-1)
This has 4 degrees of overlap at .050".
Nice info Patric.
A quick question about the cams you recommended Patrick - on the exhaust lobe you specified a XER lobe instead of a LSK lobe. Is that just because the exhaust side doesn’t need/benefit from the extra lift?
