LS2 Dyno Results
Thread Starter
Racer
Joined: Nov 2006
Posts: 448
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From: Dallas, TX
LS2 Dyno Results
Just got my car back yesterday from a cam / LT header / tune install. Here's the SAE dyno results on a Dynojet 248E. Seem about right to everyone? I didn't get a 'before' dyno, unfortunately. 
See sig for mods.
See sig for mods.
Melting Slicks
Joined: Jul 2007
Posts: 2,052
Likes: 14
It would be easier to copy/paste your mods here in the thread, just an idea to save time-
A 224/228 is a pretty small cam and you're still running the LS2 intake, seems about right to me.
A 224/228 is a pretty small cam and you're still running the LS2 intake, seems about right to me.
Last edited by JayplaySS2; Mar 23, 2011 at 12:33 PM.
Thread Starter
Racer
Joined: Nov 2006
Posts: 448
Likes: 0
From: Dallas, TX
Thread Starter
Racer
Joined: Nov 2006
Posts: 448
Likes: 0
From: Dallas, TX
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Race Director
Joined: Mar 2007
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From: Missouri City Texas
Without an underdrive pulley I'd say your numbers are just fine.
With the pulley you would've been over 430rwhp, and that's not bad for a pretty mild cam and stock ported intake.
I don't think you'd pick up much peak power with the FAST intake, but you'd probably pick up a lot in the midrange.
With the pulley you would've been over 430rwhp, and that's not bad for a pretty mild cam and stock ported intake.
I don't think you'd pick up much peak power with the FAST intake, but you'd probably pick up a lot in the midrange.
Safety Car
Joined: Jun 1999
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
On my car, I got about 15 rwhp when I ported the stock intake. I gained another 15+ rwhp over that when I put on a ported FAST 92. You'll see a big gain in both torque under the curve and peak HP with the FAST. The stock LS2 intake manifolds don't seem to do very well when you start putting on mods like you and me.
Thread Starter
Racer
Joined: Nov 2006
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From: Dallas, TX
The idle is intermittently fairly choppy, and surprisingly I do get a little side-to-side rocking (also intermittent). The rocking is annoying, so I hope I can get it tuned out somehow.
At 3K and up in the RPM range, it absolutely screams.
Safety Car
Joined: Jun 1999
Posts: 3,570
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
It's very well-mannered at low speeds, no surging, etc. I let the clutch out from a complete stop with no throttle applied, and it smoothly took off just like stock.
The idle is intermittently fairly choppy, and surprisingly I do get a little side-to-side rocking (also intermittent). The rocking is annoying, so I hope I can get it tuned out somehow.
At 3K and up in the RPM range, it absolutely screams.
The idle is intermittently fairly choppy, and surprisingly I do get a little side-to-side rocking (also intermittent). The rocking is annoying, so I hope I can get it tuned out somehow.
At 3K and up in the RPM range, it absolutely screams.
What is your idle RPM? Going to 750 - 800 rpm will do wonders. With my small cam, my idle is rock steady at 675 rpm. I sure if you have it bumped up a little it will be much improved.
Also, if your idle over/under speed spark tables are too aggressive, the idle can get into a rhythmic up/down cycle. I call it chasing its tail. On a small cam like this, you can back down the spark over/under speed tables in the lower rpm cells because its ok for it to wonder a little. Also, you can hit it harder (more timing) on the under speed table but not so hard on the over speed. This should keep it from going up/down in a rhythmic cycle.
8th Gear
Joined: Sep 2009
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From: Charlotte NC
For comparison my car has TS Lt's OR xpipe, SLP LM2 over the axle, Halltech cai, and Fow Tech cam 228/232 .600/.600 112. My numbers (Dynojet) corrected where 420/394. So it looks like we are in the norm.
Thread Starter
Racer
Joined: Nov 2006
Posts: 448
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From: Dallas, TX
I bet your idle can be improved.
What is your idle RPM? Going to 750 - 800 rpm will do wonders. With my small cam, my idle is rock steady at 675 rpm. I sure if you have it bumped up a little it will be much improved.
Also, if your idle over/under speed spark tables are too aggressive, the idle can get into a rhythmic up/down cycle. I call it chasing its tail. On a small cam like this, you can back down the spark over/under speed tables in the lower rpm cells because its ok for it to wonder a little. Also, you can hit it harder (more timing) on the under speed table but not so hard on the over speed. This should keep it from going up/down in a rhythmic cycle.
What is your idle RPM? Going to 750 - 800 rpm will do wonders. With my small cam, my idle is rock steady at 675 rpm. I sure if you have it bumped up a little it will be much improved.
Also, if your idle over/under speed spark tables are too aggressive, the idle can get into a rhythmic up/down cycle. I call it chasing its tail. On a small cam like this, you can back down the spark over/under speed tables in the lower rpm cells because its ok for it to wonder a little. Also, you can hit it harder (more timing) on the under speed table but not so hard on the over speed. This should keep it from going up/down in a rhythmic cycle.
I'm not sure what the idle RPM is, it does seem to vary a bit. I have HPTuners, so I'll connect the laptop this weekend and see what the setpoint is. Stay tuned.
Thread Starter
Racer
Joined: Nov 2006
Posts: 448
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From: Dallas, TX
