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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 06-11-2009, 09:51 PM   #1
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Gained HP from removing mufflers. +17hp (with dyno)

I removed my mufflers last week and ran on Dyna Dynmacs again today and am now at 438 Hp. Baseline before was 421 hp. Not bad for $100. Have dyno to be emailed if anyone wants it. Or someone tell me how to attach the dang thing.
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Last edited by lawdogg149; 06-11-2009 at 10:15 PM. Reason: updated dyno sheet
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Old 06-11-2009, 10:00 PM   #2
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Are those at the wheels? and what other mods did you do?
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Old 06-11-2009, 10:03 PM   #3
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Motor HP. No other mods at all.
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Old 06-11-2009, 10:03 PM   #4
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How the hell do I add this pic of dyno sheet???
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Old 06-11-2009, 10:08 PM   #5
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click edit on your first post...then go advanced...towards the bottom you will see manage attachments...then upload it....then click save.
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Old 06-11-2009, 10:18 PM   #6
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updated. look above.
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Old 06-11-2009, 10:24 PM   #7
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bump
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Old 06-11-2009, 10:28 PM   #8
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Exclamation Dyno of muffler delete +17 hp

Removed Rear two mufflers and added 17 HP. This is for sure the cheapest Mode for the Gain out there and I found it.: laughabove:
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Old 06-11-2009, 10:32 PM   #9
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That is the best bang for the buck. Did you get a reading for the torque, to see what the gain was there too.
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Old 06-11-2009, 10:33 PM   #10
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cool
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Old 06-11-2009, 10:33 PM   #11
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yea, 10 ftlbs of torque
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Old 06-11-2009, 10:42 PM   #12
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updated with pic above
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Old 06-11-2009, 10:44 PM   #13
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can you post any vids of how yours sounds???
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Old 06-11-2009, 10:47 PM   #14
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Sorry not that computer smart. There is another video on here somewhere.
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Old 06-11-2009, 10:48 PM   #15
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HP number looks a little high. Crankshaft HP is calculated not measured. Corvette experience tells me that the drivetrain loss is about 11 percent when the pull is done in 4th gear. The dyno shop may have given you a few HP in the calculation.

To get a good comparison of dyno pulls I always use my own weather station and do the SAE correction myself.
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Old 06-11-2009, 10:52 PM   #16
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I did my own corrections as well with my Iphone weather readings. Pulled in 3rd gear
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Old 06-11-2009, 10:55 PM   #17
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+
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Old 06-12-2009, 08:08 AM   #18
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Lawdogg. Thanks for posting this dyno reading up. I can feel the difference in mine from the seat but I thought it might be just the engine getting broke in a bit. This is very good results. I really was not expecting more than 5HP out of the straight pipe mod and hoped for another 5 when CAI mod complete. I am working on getting info on another inexpensive mod for the CAI. Using the existing factory plastic box and mass flow sensor, my plans are to modify the factory intake box and install a high flow CAI filter inside to increase air intake to aftermarket specs. I will let you know and post up a video as I get that done. Once again thanks for the documentation. Your job looks great by the way. I see you also saved those stock factory tips.. SS looks really good too!

Here is the link to the videos with sound clips:
http://www.camaro5.com/forums/showthread.php?t=24815
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Old 06-12-2009, 08:45 AM   #19
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Great let me know. I have a great connection for a dyno that is free. I will do anything cheap that will give any gains.
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Old 06-12-2009, 09:34 AM   #20
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Has anybody did a muffler delete on the L99 yet?

If so how did it sound?
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Old 06-12-2009, 10:20 AM   #21
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Great info'. Thanks for sharing. When you post up a sound clip or video I'll add it to the sticky
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Old 06-13-2009, 11:23 AM   #22
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Quote:
Originally Posted by JJ2010 View Post
Has anybody did a muffler delete on the L99 yet?

If so how did it sound?
We did a muffler delete on a 6.0 G8 GT. Better yet, we tested the G8 GT mufflers by disconnecting them completely from our header system and gained a whopping 3 HP. Granted the LS3 produces more power but 17 RW seems high considering our header system gained 32 rw before the tune and with stock mufflers.

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Old 06-13-2009, 11:28 AM   #23
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lawdog...
i still need info on your "guy"
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Why oh Why?
Windshield=10" vertical
mirror= 3 7/8" (that's almost 4") vertical
that means that the mirror is 38.75% the size of the vertical windshield...
it sure seems like the ratio could be better... just sayin....

our collective MIRROR patch:
http://www.camaro5.com/forums/showthread.php?t=24612
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Old 06-13-2009, 06:55 PM   #24
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Sent PM LDgn63.
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Old 06-16-2009, 10:52 AM   #25
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THX!

I stopped by my local shop yesterday... they cant do it until late in the week.
if it doesnt pan out i'll call.

thanks again!
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Why oh Why?
Windshield=10" vertical
mirror= 3 7/8" (that's almost 4") vertical
that means that the mirror is 38.75% the size of the vertical windshield...
it sure seems like the ratio could be better... just sayin....

our collective MIRROR patch:
http://www.camaro5.com/forums/showthread.php?t=24612
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