Help me spec out a cam for my LS7
10-22-2008, 07:55 AM
#1
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Help me spec out a cam for my LS7 Right now I am looking at running a 238/248 on 115. My needs have changed though. My car is no longer going to be a daily driver as I once thought, but it is going to be a primarily street driven. My previous setup was a surging beast, which I would like to avoid. I guess I want to push it to the edge of being gnarly. I want it lopey and powerful but not surge under 2k like it used to so it will be acceptable in traffic. I am finding it difficult to wrap my head around LS7 cams because of the various theories and big splits.
The car is an 6 speed LS7 427, PRC LS7 heads, 1 7/8 LT's, 3 inch GMMG exhaust, electric water pump, LS7 intake ported by me, and HS LS7 rockers. It'll run through a fabricated 9 inch.
Thanks for the help!!
BM
The car is an 6 speed LS7 427, PRC LS7 heads, 1 7/8 LT's, 3 inch GMMG exhaust, electric water pump, LS7 intake ported by me, and HS LS7 rockers. It'll run through a fabricated 9 inch.
Thanks for the help!!
BM
10-22-2008, 08:43 AM
#2
For good power under the curve with nice street manners, aim for an intake valve closing point between 46-48 degrees ABDC at .050", keep your overlap at .050" under 15 degrees, and don't go crazy on the split. While a 12-15 degree split will help carry power better above 6500 rpm, it hurts drivability (since that matters in this case). Shoot for a 6-8 degree split and you can still run a fairly healthy size intake lobe without wrecking your street manners.
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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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
10-22-2008, 11:56 AM
#4
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I've put over 10k miles on my C6 Z06 LS7 w/ a XER lobed 242/248 110+4, 25 degrees overlap. It surges under 1500rpm. Love the power, but probably would use the same lobes on a 114 or 115+3 if I was to do it over for a bit better driveability. So your initial thoughts are in line w/ my experience.
10-22-2008, 12:15 PM
#5
I'd have to agree with Patrick G. I'm currently running a cam that I spec'd out when LS7 first came out, its a 242/256 113+2. Driveability is decent once I was able to tie-down the tune, but there is a slight amount of bucking (barely noticeable, if at all) between 1500-1800 rpms, otherwise its fine. It makes really good power given my combo, and has plenty of torque.
If your primary concern is power, with better driveability, I would run a 234/246 114 to help push out the rpm band a little more while keeping driveability easily manageable. Bump your compression to 11.5-6:1 which will help build your torque as well.
If your primary concern is power, with better driveability, I would run a 234/246 114 to help push out the rpm band a little more while keeping driveability easily manageable. Bump your compression to 11.5-6:1 which will help build your torque as well.
10-22-2008, 04:46 PM
#6
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I'd have to agree with Patrick G. I'm currently running a cam that I spec'd out when LS7 first came out, its a 242/256 113+2. Driveability is decent once I was able to tie-down the tune, but there is a slight amount of bucking (barely noticeable, if at all) between 1500-1800 rpms, otherwise its fine. It makes really good power given my combo, and has plenty of torque.
If your primary concern is power, with better driveability, I would run a 234/246 114 to help push out the rpm band a little more while keeping driveability easily manageable. Bump your compression to 11.5-6:1 which will help build your torque as well.
If your primary concern is power, with better driveability, I would run a 234/246 114 to help push out the rpm band a little more while keeping driveability easily manageable. Bump your compression to 11.5-6:1 which will help build your torque as well.
