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

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Old 07-30-2009, 03:19 PM   #1
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Another L99 Dyno tune (with headers and CAI)

Had this L99 on the dyno last night and have to say I am very impressed with the gains headers are giving these cars. Baseline, the car pulled 343HP and 367 torque at the tires with the ARH headers and cold air intake. After the tune 367HP and 387 ft/lbs. This car picked up a little more HP from the tune (24/25 at the tires) but less torque (20Ft/lbs) than the bone stock L99 I did last week (22hp and 42Ft/lbs if I remember correctly). First dyno sheet will be baseline vs Final tune, 2nd will be the baseline of last weeks bone stock car vs baseline of headers/cai car to give you an idea of the gains for those two mods and the fine will be last weeks baseline bone stock l99 vs final tuned with headers/cai run from yesterday. Once again, the stock tune has proven to be VERY rich like we keep seeing. This car dipped into the 10's on the air/fuel on the baseline. On the runs from the bone stock car last week, ignore the air/fuel lines as it was not reporting to the dyno and I was using my portable unit.
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Old 07-30-2009, 04:29 PM   #2
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Great gains there!!
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Old 07-30-2009, 04:32 PM   #3
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Nice numbers
All the L99s needs are a few mods and a tune to really make some real good HP.
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Old 07-30-2009, 04:40 PM   #4
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Very nice gains. What CAI did you use for this dyno run? Pics of CAI?
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Old 07-30-2009, 06:47 PM   #5
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You guys are really pushing me over the edge.
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Old 07-30-2009, 06:54 PM   #6
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That's fantastic. Now I just need someone to give me free ARH headers.
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Old 07-30-2009, 08:00 PM   #7
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That was my car on the Dyno. The CAI is a New Era. The roads were wet last night when I got it tuned so I did not get a chance to push her hard. Today all I have to say is OMG! I need to get to a track to see what she will do but I am impressed with the improvement with the mods and tune. The difference in torque is unreal and with the lower L99 gears she pull like hell in first and second. Bryan at PCMforless did a great job. I had him turn the AFM off until 55 mph. I like that much better but might consider turning it off completely. With the headers, even with the tune, there is still more noise with AFM at cruising speed than I like.
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Old 07-30-2009, 08:20 PM   #8
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how was the car before the mods
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Old 07-31-2009, 06:51 AM   #9
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Before the mods it ran good. It was what I expected. Unfortuantely I don't have any documentation like time slips, but I was totally happy.
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Old 07-31-2009, 06:58 AM   #10
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Um yeah, nice work! 60hp! Shawwwweeeeeeeet!
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Old 07-31-2009, 08:08 AM   #11
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Dang see that is what I would like, AFM off until 55.
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Old 07-31-2009, 08:14 AM   #12
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From what I was shown when my car was being tuned, there are a lot of options with the AMF. It does not have to be an all on or off option. I wanted to leave it on above 55mph to still take advantage of the increased gas mileage when I was cruising. The car is somewhat a daily driver for me. I do not know all of the ways the AMF can be adjusted but based on speed is one. It can also be made more or less sensitive. Someone that does tuning I am sure could give a more detailed explaination.
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Old 07-31-2009, 08:23 AM   #13
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Are the headers long or short tube? If long are they OK in PA with inspections? Will you look at catback exhaust now? Looks like the L99 is now getting close to LS3 levels.
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Old 07-31-2009, 08:39 AM   #14
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I have ARH long tube 1-7/8" with 3" all the way to the stock muffler. This includes the high flow cats. I understand that in PA what matters is if it passes the emissions not if you have LT headers. I guess it remains to be seen if I will have any problems passing the emissions, but I was told I should not. I don't need a catback because everything was replaced to the axle with the ARH system. I do not plan on replacing the stock muffler at this time because I like the fact that the car is quiet when cruising and really comes to life (nice loud muscle car sound) when I put my foot into it.
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Old 07-31-2009, 07:36 PM   #15
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I might try the varram CAI with shorty headers and catback exhaust, when they are all available and get a dyno run again to verify results, would like the 40 HP/ 40 torque as a target.
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Old 08-01-2009, 07:20 AM   #16
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I would have considered Viraram, but I needed to get the car tuned after putting on the headers and just could not wait any longer. Hope you get the results you want. From what I have read you should not expect too much from shorty headers. I have not had any direct experience with them however. I plan on going to Starlite in Wexford 8/7 for the car cruise. Camaro week. Stop down. I think there will be a few Camaro5 members with 5th gen's there.
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Old 08-01-2009, 07:33 AM   #17
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I am amazed that the L99's are pulling as low a nimber as they are. My 2005 GTO with an LS2 (that's 6.0 liters, not 6.2) and A4 pulled 333 hp before a tune and 351hp after -NO headers, only an X pipe, CAI and Magnaflow mufflers only. This L99 with headers was 10 hp more stock than my GTO? Vector Motorsports did my tune and they have a Mustang Dyno. There is no doubt the headers are helping but the factory tune on these cars is awful. What's interesting is that headers only give us LS2 guys about 20 hp.

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Old 08-01-2009, 08:19 AM   #18
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Everyone seemed to be expecting that there would be a 15 to 20 percent loss through the drive in the L99, but Bryan who tuned my car said he is seeing 22%. Not good. The factory tune does seem bad too, which adds to the loss. And I have to say I was disappointed with the factory HP and torque numbers. But a tune does seem to help a lot. A stock L99 can see a gain of 40 ftlbs of torque just with a tune. I don't remember the HP gain off the top of my head, but it was not as much as the torque.
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Old 08-01-2009, 08:44 AM   #19
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Originally Posted by irpq11 View Post


You guys are really pushing me over the edge.
Yup... I got pushed over the edge last week when I drove a guys L99 with tune. OMG what a HUGE difference.
Even chirps the tires going to 2nd (didn't try 3rd since it was his car)

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Originally Posted by Scott@Bjorn3D View Post
Dang see that is what I would like, AFM off until 55.
That would be perfect too. He left his AFM on but I wonder if you can set it for speed...

These were some nice gains and it seems to be repeated with everyone... good news...
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Old 08-01-2009, 09:42 AM   #20
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Yup... I got pushed over the edge last week when I drove a guys L99 with tune. OMG what a HUGE difference.
Even chirps the tires going to 2nd (didn't try 3rd since it was his car)



That would be perfect too. He left his AFM on but I wonder if you can set it for speed...

These were some nice gains and it seems to be repeated with everyone... good news...


Who did his tune here in the DFW area ?
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Old 08-01-2009, 09:57 AM   #21
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Who did his tune here in the DFW area ?
Was done by Hennessey in Sealy TX...
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Old 08-01-2009, 10:04 AM   #22
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So with headers and an intake...and a tune we make what an ls3 makes stockish? Thats sad. Im starting to feel scammed by the l99. I may be bringing this car back for a 2011 ls3.
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Old 08-01-2009, 10:46 AM   #23
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So with headers and an intake...and a tune we make what an ls3 makes stockish? Thats sad. Im starting to feel scammed by the l99. I may be bringing this car back for a 2011 ls3.
No... you surpass what the LS3 makes at the crank. Auto is always going to lose more HP at the wheels... but I guarantee you'll get more out of your tune than a LS3 will.
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Old 08-01-2009, 03:04 PM   #24
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According to GM the L99 is faster than the LS3 0-60 MPH. The L99 has variable timing and lower gears. Melee is right from what is being seen from tunes. The L99 is getting more from a tune. I think it is to be seen which is better in the long run. Might be fun competition.
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Old 08-01-2009, 03:55 PM   #25
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So with headers and an intake...and a tune we make what an ls3 makes stockish? Thats sad. Im starting to feel scammed by the l99. I may be bringing this car back for a 2011 ls3.

You don't understand the difference between an auto and a manual.

Race a stock LS3 M6 Camaro against an L99 A6 Camaro with long tubes, intake, and a tune. Even though they may make the same rwhp, the automatic will win that race pretty much everytime.

Both cars modded and tuned (bolt ons)
With 20 rwhp less, my 06 A4 (auto) GTO ran consistantly faster times at the track than my 05 M6 (manual) GTO.

So you can't compare apple to apples when looking at rwhp (auto vs manual).
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