383 Cam swap
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From: Princeton, Texas
383 Cam swap Current graph inside. Needing input on whether or not swapping a bigger cam into my 383 would yield worthwhile results.
Motor specs:
Ls6 block
4" crank
Flat top pistons w/ reliefs
Patriot Stg 2 243 heads. (not milled)
232/234 596/598 112lsa cam
Ported Fast 90, 92 TB. 85mm maf
Pacesetter 1 3/4" LT's
Custom offroad Y w/ 4" flowmaster merge, dumped
Motor made 466rwhp/463rwtq corrected.
(disregard the afr. as seen in graph, car made consistent power whether the afr was 11.5 or 13.5 which is weird)
I have also ran 11.35 and 122mph in 1/4 with a 1.75 60ft. 7.3 at 97mph in 1/8th. (I really feel like another 1-2mph are in the car as it sits.) This was all with a 3480lbs raceweight. Car is a m6 with 4.10 gears.
All this being said, and after checking out my dyno graph, I'm wondering if a cam swap would yield a little better performance and power. I'm in no way dissapointed with my power output, I just really feel like I'm losing a substantial amount of potential power with this small of a cam in a stroker.
Car is not a DD, and drivability is not my primary concern. I do not, however, want to lose track mph. Getting a big hp number on a dyno means nothing if it has no low/mid pulling power and won't get better track results.
I also realize that a head/cam swap would make the biggest difference, but budget wise I'm only considering a cam swap at this point.
Anything you notice about my dyno graph that is worth mentioning is welcome.
Motor specs:
Ls6 block
4" crank
Flat top pistons w/ reliefs
Patriot Stg 2 243 heads. (not milled)
232/234 596/598 112lsa cam
Ported Fast 90, 92 TB. 85mm maf
Pacesetter 1 3/4" LT's
Custom offroad Y w/ 4" flowmaster merge, dumped
Motor made 466rwhp/463rwtq corrected.
(disregard the afr. as seen in graph, car made consistent power whether the afr was 11.5 or 13.5 which is weird)
I have also ran 11.35 and 122mph in 1/4 with a 1.75 60ft. 7.3 at 97mph in 1/8th. (I really feel like another 1-2mph are in the car as it sits.) This was all with a 3480lbs raceweight. Car is a m6 with 4.10 gears.
All this being said, and after checking out my dyno graph, I'm wondering if a cam swap would yield a little better performance and power. I'm in no way dissapointed with my power output, I just really feel like I'm losing a substantial amount of potential power with this small of a cam in a stroker.
Car is not a DD, and drivability is not my primary concern. I do not, however, want to lose track mph. Getting a big hp number on a dyno means nothing if it has no low/mid pulling power and won't get better track results.
I also realize that a head/cam swap would make the biggest difference, but budget wise I'm only considering a cam swap at this point.
Anything you notice about my dyno graph that is worth mentioning is welcome.
Last edited by dlc1609; Aug 26, 2010 at 12:11 PM.
Thread Starter
11 Second Club
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From: Princeton, Texas
Two other things:
1) I don't mind going the custom spec'd cam route if some thought it would gain decent results.
2) I had a g5x4 in my last 383 and it made 498/457. Similar torque, just more hp on top. You could really feel the extra power up top in that car too. It was a little laggy at low rpms (new motor is not), but it was also geared 3.42. 4.10s oughta help my current car if a similar cam were swapped in. Other components were quite similar to this motor. The x4 sounded alot better at idle too.
1) I don't mind going the custom spec'd cam route if some thought it would gain decent results.
2) I had a g5x4 in my last 383 and it made 498/457. Similar torque, just more hp on top. You could really feel the extra power up top in that car too. It was a little laggy at low rpms (new motor is not), but it was also geared 3.42. 4.10s oughta help my current car if a similar cam were swapped in. Other components were quite similar to this motor. The x4 sounded alot better at idle too.
Last edited by dlc1609; Feb 1, 2010 at 06:09 PM.
EDIT: Get your 60 down and you will be in the 10's
Last edited by SOMbitch; Feb 1, 2010 at 07:53 PM.
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A 383 will want 6-8 degrees more overlap than an LS1. Basically, your 236-239 cam is like a 229/232 cam in an LS1...good size, but not huge. I would say your current cam is perfect for a daily driven street strip car, but for a weekend-only toy, you could go bigger. The PP heads will need more overlap than really good heads like Trick Flows because they lack the really strong mid-lift flow numbers. You could afford to go into the lower 240s on intake and mid to upper 240s on exhaust duration. Lift would depend on where your heads flow best and your spring life expectations. Most likely, you'd wind up with an LSA between 111-112.
__________________
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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From: Greenville, Texas
Thread Starter
11 Second Club
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Joined: Oct 2006
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From: Princeton, Texas
A 383 will want 6-8 degrees more overlap than an LS1. Basically, your 236-239 cam is like a 229/232 cam in an LS1...good size, but not huge. I would say your current cam is perfect for a daily driven street strip car, but for a weekend-only toy, you could go bigger. The PP heads will need more overlap than really good heads like Trick Flows because they lack the really strong mid-lift flow numbers. You could afford to go into the lower 240s on intake and mid to upper 240s on exhaust duration. Lift would depend on where your heads flow best and your spring life expectations. Most likely, you'd wind up with an LSA between 111-112.
I just ordered a plate kit from Nitrous Outlet and could focus my cam money towards suspension and drivetrain mods if power gains would only be something like 10rwhp with no appreciable torque gains.
(And for the anyone wondering, the video posted by Sneaky is of a Terminator I'm lined up to race. He currently makes 533rwhp/501rwtq and has a similar raceweight.)
i think you need to just worry about the suspension. Take those 1.7's down to 1.5's or so and you will be right around the 10's. I was wonderin why that video was posted haha. I'd hold off on the cam until after suspension if money is a problem.
Thread Starter
11 Second Club
iTrader: (20)
Joined: Oct 2006
Posts: 197
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From: Princeton, Texas
I would still like to hear from anyone what they think a properly spec'd cam would add to my power output or speed.....
