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

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Old 08-10-2009, 01:53 PM   #1
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*Official* L99 Dyno Thread

Can someone make this a sticky?

Seems like with all the L99 talk theres alot of variation on what they put down, I have seen from 295-330rwhp

So post up your results and some basic info on your car (mileage, break in procedure ect ect )


my results are posted, stock vs tuned
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Old 08-12-2009, 01:52 PM   #2
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Old 08-12-2009, 07:01 PM   #3
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Stock , 600 miles, pulled 319rwhp back to back twice, then removed ECM fuses for 5 minutes to reset LTFT`s (Long Term Fuel Trims), immediatley ran it again and picked up close to 8 rwhp. This is that last pull.

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Old 08-12-2009, 11:03 PM   #4
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Quote:
Originally Posted by SGOS252382 View Post
Weren't these runs done with muffler delete? (SLP loudmouth 1)That's not stock.
The L99 runs pretty restrictive mufflers. See post # 103 vs. # 104 in this thread.
http://www.camaro5.com/forums/showth...ffler+pictures
The L99 mufflers are different from the straight through design of the LS3's. So a muffler delete on an L99 should be good for some HP.


everything thing I have read concludes the real restriction is way before the mufflers and that an axle back adds nothing but sound
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Old 08-13-2009, 07:10 PM   #5
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Here is my stock vs. tune dyno. As you can see in the south Florida heat and humidity my car pulled about 332rwhp/345FT# stock.

With the tune it looks to be about 345rwhp/357FT#. Considering the weather I'm happy, I'd like to get it back on the dyno once it cools down. I have just over 5,200 miles on the car. I was at the drag strip with 300 miles...what break in?

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Old 08-13-2009, 07:30 PM   #6
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Here's mine stock and with a tune (ECM). 500 miles driven semi-hard.
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Old 08-14-2009, 11:30 AM   #7
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Old 08-14-2009, 04:13 PM   #8
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First one is stock, and the second is stock with only tune. about 85 degrees in north jersey. gained around 27 hp and 45 tq


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Old 08-14-2009, 04:28 PM   #9
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94 - 99 degrees and very high humidity (also drove 130 miles to get there).
Stock and tuned (no mods).

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Old 08-16-2009, 07:26 AM   #10
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Another Slow L99

Car has 3000 miles first 1500 took it kind of easy. Changed the oil and since then I have been driving it like i stole it!
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Old 08-16-2009, 07:38 AM   #11
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Quote:
Originally Posted by SGOS252382 View Post
94 - 99 degrees and very high humidity (also drove 130 miles to get there).
Stock and tuned (no mods)....
Your Dyno is run is SAE so temp and humidity is already taken into account. Randy's sheet is STD so not really good for comparison among all the SAE runs. Mine is also STD posted in another thread so I'll wait and get SAE to post in here...

Now your 130 miles and hot motor would lower the numbers a tad
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Old 08-16-2009, 01:29 PM   #12
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Quote:
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Your Dyno is run is SAE so temp and humidity is already taken into account. Randy's sheet is STD so not really good for comparison among all the SAE runs. Mine is also STD posted in another thread so I'll wait and get SAE to post in here...

Now your 130 miles and hot motor would lower the numbers a tad
STD, SAE

Are my numbers actually lower or what?
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Old 08-17-2009, 06:43 AM   #13
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Car has 3000 miles first 1500 took it kind of easy. Changed the oil and since then I have been driving it like i stole it!
That one is UGLY!
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Old 08-17-2009, 09:14 AM   #14
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Yes it is sad but true.

I also posted my 0-60 times around 6.8 seconds. I just came from the dealer and they where unable to do anything but open a case. The tech told me there was only one other case like mine and it was closed and marked as normal. He also told me that there where no PIs I think is what he called them. Which means they are not activally working on the issue that he could tell. Long story short While some are saying sit and wait GM will make good. I think everyone that has an underperforming L99 needs to get in and have a case open to put a fire under GM to resolve the issue.
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Old 08-17-2009, 04:28 PM   #15
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STD, SAE

Are my numbers actually lower or what?
No, SAE corrected will increase the numbers unless you're below sea level and somewhere really cold and dry.
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Old 08-18-2009, 03:37 PM   #16
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Quote:
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No, SAE corrected will increase the numbers unless you're below sea level and somewhere really cold and dry.
Oh, SNAP. You mean if it were run with SAE it would have been HIGHER than the 317 recorded?

I'm confused. I should be running faster.

Delete if needed.
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Old 08-18-2009, 09:26 PM   #17
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Oh, SNAP. You mean if it were run with SAE it would have been HIGHER than the 317 recorded?
Probably. SAE-corrected does take into account temperature and humidity to theoretically provide a standardized number. Given you dyno'd in the south and in the summer, it's likely that if it were SAE-corrected it would be a higher number.
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Old 08-19-2009, 06:20 AM   #18
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Two questions...does anyone know somewhere in NW FL I can go to dyno my car, and what tuners are you guys using? Someone mentioned a Diablo Sport, but what else? Thanks guys!!
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Old 08-22-2009, 04:13 PM   #19
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Two questions...does anyone know somewhere in NW FL I can go to dyno my car, and what tuners are you guys using? Someone mentioned a Diablo Sport, but what else? Thanks guys!!
If you can drive to Tampa, Jeremy Formato is a great tuner. He is very respected in the LSX community.
www.fasterproms.net

He also visits different tuning shops in other area of Florida.
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Old 08-28-2009, 08:42 PM   #20
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Advertised 400 HP

How does GM get away with advertising the HP at 400 for the L99 and 426 for the LS3 when no one has dyno'd that? Did I miss something in the fine print?
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Old 08-28-2009, 09:55 PM   #21
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How does GM get away with advertising the HP at 400 for the L99 and 426 for the LS3 when no one has dyno'd that? Did I miss something in the fine print?
These Dyno's calculate RWHP (rear wheel Horse power) Chevy calculates Horse Power at the crank.
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Old 08-28-2009, 10:06 PM   #22
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Might as well post mine here.

First run is stock at about 700 miles.

Second run is with rotofab cai and a tune done about two weeks later.

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Old 08-30-2009, 07:12 PM   #23
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Quote:
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How does GM get away with advertising the HP at 400 for the L99 and 426 for the LS3 when no one has dyno'd that? Did I miss something in the fine print?
Because despite what Top Gear tried to promote in their dyno test of a GT500, the number that is advertised is not the same as what you will be testing when you strap it down for a dyno run. GM and every single other automaker out there rates their engines with an engine dyno. This is a test rig that measures the output of the engine. A chassis dyno, which is what you most often see, measures the power at the wheels. This is the power at the crank minus any losses from the drivetrain.
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Old 08-31-2009, 09:28 AM   #24
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Thanks guys. I better understand the process now. Great explanations!
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Old 09-03-2009, 10:20 PM   #25
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Just dyno'd mine tonight, complete stock to the filter, 1050 miles, easy first 450, then having fun. Pulled fuses at about 600 miles.

About 85 degrees, first run 321hp, 336tq. Second run (about 1 minute idling rest) 313hp, 319tq
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