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

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Old 08-04-2009, 07:56 AM   #1
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Question L99/LS3

Besides power output and A6 or M6 trans, what is the difference? Just a heads and cam package? Could a L99 be made into a LS3?
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Old 08-04-2009, 08:17 AM   #2
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Not sure, the internals might be different due to the active fuel management.
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Old 08-04-2009, 09:36 AM   #3
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lower compression in the l99 and different camshaft.

The L99 does respond very well to mods....just add some long-tubes and a CAI and you will have more power than a stock LS3 easily
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Old 08-04-2009, 09:47 AM   #4
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LS3 Has 26 more baseline horsepower; yet an average of 50 hp more to the wheels than the automatics (L99). Ive noticed alot of people with the LS3 are dyno'ing around 360 WHP and with the L99 around 310 WHP. Mods such as ecu reflash will be more effective on the L99. The only difference between the L99 and LS3 is the L99 has less aggressive cam shafts and it ads the AFM (Active Fuel Management). Im going with the L99 because Im lazy and I like my knees . L99 is good for modding man. CAI/Headers/**Torque Converter/Tune and you'll have around 400whp on the L99 fun stuff


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Old 08-04-2009, 04:07 PM   #5
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Ah torque converter, that's a term I've not heard of in a long while (long time manual driver). But isn't that more for drag racing or can that actually benefit you in more ways? Any suggestions on a Torque converter?
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Old 08-04-2009, 04:30 PM   #6
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LS3 Has 26 more baseline horsepower; yet an average of 50 hp more to the wheels than the automatics (L99). Ive noticed alot of people with the LS3 are dyno'ing around 360 WHP and with the L99 around 310 WHP. Mods such as ecu reflash will be more effective on the L99. The only difference between the L99 and LS3 is the L99 has less aggressive cam shafts and it ads the AFM (Active Fuel Management). Im going with the L99 because Im lazy and I like my knees . L99 is good for modding man. CAI/Headers/**Torque Converter/Tune and you'll have around 400whp on the L99 fun stuff


Grant
The L99's that are "normal" are dynoing around 320 rwhp (on average).

If the L99 was in a stick/manual Camaro (like the LS3 is) you could easily add 20 rwhp to that. (16% vs 20%)
So an L99 with a stick/manual would be putting down around 340 rwhp (on average).

The LS3's are dynoing around 360 rwhp (on average).

So there really isn't as big of a difference between the two motors as most people think.

And from what I've been seeing, the L99's torque numbers increase significantly with a tune.
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Old 08-04-2009, 04:33 PM   #7
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Ah torque converter, that's a term I've not heard of in a long while (long time manual driver). But isn't that more for drag racing or can that actually benefit you in more ways? Any suggestions on a Torque converter?
yank 3200 or 3600 will really wake the car up but the 3200 would be more streetable
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Old 08-04-2009, 04:35 PM   #8
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The L99's that are "normal" are dynoing around 320 rwhp (on average).

If the L99 was in a stick/manual Camaro (like the LS3 is) you could easily add 20 rwhp to that. (16% vs 20%)
So an L99 with a stick/manual would be putting down around 340 rwhp (on average).

The LS3's are dynoing around 360 rwhp (on average).

So there really isn't as big of a difference between the two motors as most people think.

And from what I've been seeing, the L99's torque numbers increase significantly with a tune.
thats what a munch of us have been trying to tell the l99 haters lol
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Old 08-04-2009, 04:53 PM   #9
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yank 3200 or 3600 will really wake the car up but the 3200 would be more streetable
Would the 3600 need a gear beef up? What would the difference be? They seem to cost the same.
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Old 08-04-2009, 04:55 PM   #10
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Anyone have a good suggest for a camshaft as well? L99 friendly that is.
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Old 08-04-2009, 05:28 PM   #11
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Would the 3600 need a gear beef up? What would the difference be? They seem to cost the same.
no but it wouldn't hurt and performance wise you wont see a difference unless you put on some drag radials or slicks then you would need to beef up everything
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Old 08-04-2009, 05:33 PM   #12
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Anyone have a good suggest for a camshaft as well? L99 friendly that is.
comp cams is coming out with really good vvt afm cams

i don't think its ready yet but they should be coming you might wanna check them out
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Old 08-04-2009, 05:34 PM   #13
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Thanks Gentry.
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Old 08-04-2009, 05:47 PM   #14
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I dont think it would be worth it to make it into a LS3. Too much money that could be used in better ways.
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Old 08-04-2009, 05:52 PM   #15
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Thanks Gentry.
no problem

here is some info on the cams

http://www.camaro5.com/forums/showthread.php?t=25491
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Old 08-04-2009, 06:13 PM   #16
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Stock LS3 vs Stock L99 Dyno graph

Just did a tune only on my LS3 today and picked up 14rwhp/13rwt. Not too bad, but I'm pretty sure the L99's pick up a considerable amount more for a tune only.



Before and after dyno on my LS3
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Old 08-04-2009, 06:30 PM   #17
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Stock LS3 vs Stock L99 Dyno graph

Just did a tune only on my LS3 today and picked up 14rwhp/13rwt. Not too bad, but I'm pretty sure the L99's pick up a considerable amount more for a tune only.



Before and after dyno on my LS3
damn the stock is rich
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Old 08-04-2009, 06:36 PM   #18
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damn the stock is rich
That's what we said. We leaned it up some, but the car really doesn't like to be too lean. We even tried to leave it rich and throw timing at it, but what you see there is about the best we could get after a few pulls.

Certainly not complaining, solid gains over the entire RPM band.
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Old 08-04-2009, 07:03 PM   #19
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That's what we said. We leaned it up some, but the car really doesn't like to be too lean. We even tried to leave it rich and throw timing at it, but what you see there is about the best we could get after a few pulls.

Certainly not complaining, solid gains over the entire RPM band.
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Old 08-04-2009, 07:26 PM   #20
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Quote:
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Anyone have a good suggest for a camshaft as well? L99 friendly that is.
check these guys out...

www.mastmotorsports.com



as for the major differences between the motors,

lifters, pistons, valvetrain, camshaft are all different,

to convert an L99 to LS3, you can leave the pistons, but swap the camshaft, the valvetrain (lifters, springs, pushrods) or swap the heads themselves from an LS3, disable the AFM/VVT via computer tune, replace the timing chain and front cover and a few other little things here and there.
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