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

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Old 10-29-2008, 03:07 AM   #1
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Tuning LS3 vs L99

Hi I just wanted your opinion on how hard it will be to modify/tune the L99 vs the LS3. I know that the LS3 already has a large aftermarket following, do you think the L99 will as well, or will the AFM keep it from reaching the aftermarket status of the LS3? Has anyone worked with AFM cars before? I'd like the L99 as I prefer auto for the drag strip(although I enjoy and currently have a manual vehicle) however I'm wondering if having the L99 will defeat the purpose.:(
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Old 10-29-2008, 03:10 AM   #2
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they are practically the same engine, once you disable AFM you should be able to use any ls series part on it.
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Old 10-29-2008, 03:18 AM   #3
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I see.. so you would have to disable AFM then. So any chance of saving gas vs the manual would be gone. What would have to be done to recuperate the power the 22 hp that was lost vs the ls3?
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Old 10-29-2008, 03:20 AM   #4
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turn off afm and get a tune....
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Old 10-29-2008, 03:25 AM   #5
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Hmmm... after doing that then the parts will be interchangeable?
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Old 10-29-2008, 03:33 AM   #6
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Quote:
Originally Posted by Evilangel View Post
Hmmm... after doing that then the parts will be interchangeable?
for the most part yes, exhaust manifolds, headers, intakes should all be interchangeable
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Old 10-29-2008, 07:46 AM   #7
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i thought i read that the cam profile was different for the l99, not as much lift thats why, the redline is different... but everything else is exactly the same
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Old 10-29-2008, 07:59 AM   #8
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Quote:
Originally Posted by Evilangel View Post
Hi I just wanted your opinion on how hard it will be to modify/tune the L99 vs the LS3. I know that the LS3 already has a large aftermarket following, do you think the L99 will as well, or will the AFM keep it from reaching the aftermarket status of the LS3? Has anyone worked with AFM cars before? I'd like the L99 as I prefer auto for the drag strip(although I enjoy and currently have a manual vehicle) however I'm wondering if having the L99 will defeat the purpose.:(
So to take off with the automatic on a drag strip you would simply press down on the pedal or have it on neutral with the gas down and then switch to drive? Or are you using the paddle shifters?
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Old 10-29-2008, 08:06 AM   #9
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or have it on neutral with the gas down and then switch to drive?


not on any car i own...

on a side note, in h.s. my friend would do this to his chevette ALL THE TIME and his car ran for ever!!! well until a trunk ran a red light
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Old 10-29-2008, 10:28 AM   #10
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It sounds like the AFM is defeatable because I remember reading a little about the development of the Maggy' 1900 on the G8's 6.0 and they were saying, if I'm not mistaken, that they could turn it off if they needed to, although they were trying to run the car with it on to see if they could.
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Old 10-29-2008, 12:17 PM   #11
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Check out G8board.com. There are some there who have s/c'd their AFM powered G8 GT's. There will be no shortage of aftermarket tuning parts for the L99 Camaro.
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Old 10-29-2008, 06:36 PM   #12
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I am doing some speculating here, but I believe if you put the standard LS3 cam/lifters in the L99 you could gain back the 22hp, and most likely safely move the rpm limit up to 6600-the same as the LS3. May as well do this if you are going to tune out the AFM mode anyway. With the more aggressive gearing of the auto car this would be one nice mod. Of course, economy would suffer but oh well. The only thing I am not sure about in terms of raising the rpm limit is the VVT setup, but I don't see why that would hurt, I think the timing is most likely fixed above a certain rpm/load anyway.
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Old 10-29-2008, 07:05 PM   #13
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Aren't the cams different between the two too?... Better watch where you're shifting that tranny also.
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Old 10-29-2008, 08:06 PM   #14
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Aren't the cams different between the two too?... Better watch where you're shifting that tranny also.
Yes, the L99 has a less aggressive cam, that is what I meant, to put a LS3 cam and lifters in to get the LS3 with the auto, effectively. Of course, to go to that trouble you may as well step up to the hot cam anyway. I don't know much about automatic transmissions, but why would that extra rpm be a problem? Does'nt the vette use a similar auto trans (obviously rear mounted) and have a 6500 rpm redline?
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Old 10-29-2008, 08:11 PM   #15
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Now the obvious question... What does it do to the drivetrain warranty?
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Old 10-30-2008, 09:56 AM   #16
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There is no reason to disable AFM to do mods or a tune. The time the AFM will be on isnt very much unless you cruise on the highway a lot and when you are wanting the power, it wont be on at all.
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Old 10-30-2008, 10:10 AM   #17
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So to take off with the automatic on a drag strip you would simply press down on the pedal or have it on neutral with the gas down and then switch to drive? Or are you using the paddle shifters?
Did I really just read that?
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Old 10-30-2008, 11:22 AM   #18
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Did I really just read that?
haha that's what I thought.

Yeah try to avoid doing that guys...it might end up with slight transmission damage. Plus there will be some scratches on it from being dropped out of the car
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