Tuning LS3 vs L99 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Evilangel · 10-29-2008, 02:07 AM

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.:(

headpunter · 10-29-2008, 02:10 AM

they are practically the same engine, once you disable AFM you should be able to use any ls series part on it.

Evilangel · 10-29-2008, 02:18 AM

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?

headpunter · 10-29-2008, 02:20 AM

turn off afm and get a tune....

Evilangel · 10-29-2008, 02:25 AM

Hmmm... after doing that then the parts will be interchangeable?

headpunter · 10-29-2008, 02:33 AM

Quote:

Originally Posted by Evilangel

Hmmm... after doing that then the parts will be interchangeable?

for the most part yes, exhaust manifolds, headers, intakes should all be interchangeable

baileyrx · 10-29-2008, 06:46 AM

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

Supermans · 10-29-2008, 06:59 AM

Quote:

Originally Posted by Evilangel

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?

baileyrx · 10-29-2008, 07:06 AM

Quote:

Originally Posted by Supermans

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

*radz28* · 10-29-2008, 09:28 AM

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.

carfansince73 · 10-29-2008, 11:17 AM

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.

rayhawk · 10-29-2008, 05:36 PM

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.

*radz28* · 10-29-2008, 06:05 PM

Aren't the cams different between the two too?... Better watch where you're shifting that tranny also.

rayhawk · 10-29-2008, 07:06 PM

Quote:

Originally Posted by radz282003

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?

10-29-2008, 02:07 AM	#1
Evilangel Drives: 2003 Evo(450hp) , 95 CamaroZ28 Join Date: Oct 2008 Location: Illinois Posts: 72	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.:(

10-29-2008, 02:10 AM	#2
headpunter Not That sad..considering Drives: Man Join Date: Aug 2007 Location: the part of washington the capital forgot about. Posts: 3,747 View My Garage	they are practically the same engine, once you disable AFM you should be able to use any ls series part on it. __________________ Stop Whinging

10-29-2008, 02:20 AM	#4
headpunter Not That sad..considering Drives: Man Join Date: Aug 2007 Location: the part of washington the capital forgot about. Posts: 3,747 View My Garage	turn off afm and get a tune.... __________________ Stop Whinging

10-29-2008, 09:28 AM	#10
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,179 View My Garage	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. __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

10-29-2008, 11:17 AM	#11
carfansince73 Drives: Carefully Join Date: Mar 2008 Location: Florida Posts: 1,213 View My Garage	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. __________________ 2010 1SS RS, LS3, SIM/Black, painted rally stripes, AAC sidemarkers, Sunroof, B.A. sound sys; 20x9.5 & 20x11 SV1-C5's; MGW short shifter; Hotchkis Track Pack; Corsa catback; Kooks 1 7/8"; ADM Street; Magnacharger TVS2300 - 548rwhp/512rwtq 1100- 2/18/09; 3800- 6/15/09 VIN#18308; Delivered 6/29/09!!!!! 2014 CTS-V Sedan, Black/Black, Auto, Recaros, Ultra-view, Red Brembos. Stock

10-29-2008, 02:18 AM	#3
Evilangel Drives: 2003 Evo(450hp) , 95 CamaroZ28 Join Date: Oct 2008 Location: Illinois Posts: 72	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?

10-29-2008, 02:25 AM	#5
Evilangel Drives: 2003 Evo(450hp) , 95 CamaroZ28 Join Date: Oct 2008 Location: Illinois Posts: 72	Hmmm... after doing that then the parts will be interchangeable?

10-29-2008, 06:46 AM	#7
baileyrx Drives: 2003 g35 Join Date: Apr 2008 Location: nc Posts: 198 View My Garage	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

10-29-2008, 05:36 PM	#12
rayhawk Drives: Camaro SS Join Date: Aug 2008 Location: Miami Posts: 1,060 View My Garage	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. __________________

10-29-2008, 06:05 PM	#13
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,179 View My Garage	Aren't the cams different between the two too?... Better watch where you're shifting that tranny also. __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

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