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

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Old 04-10-2009, 10:04 PM   #1
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Why Both L99 & LS3?

Seems strange that two different 6.2L V8's are offered in both manual and automatic variants. With only 26 Hp between them you'd think the added plant complexity & emissions certification would destroy the business case.
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Old 04-10-2009, 11:33 PM   #2
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The only explanation I can think of is that the automatic LS3 might have had difficulty with the gas guzzler tax and/or CAFE. I don't think the auto gets hit with the tax on the Corvette, but that's a much lighter car.
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Old 04-11-2009, 12:19 AM   #3
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Automatics use more fuel. So they use the L99 which has provisions for Active Fuel Management. This brings the automatic back into acceptable fuel consumption range. And for some reason the L99 ran better at the 400hp mark.
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Old 04-11-2009, 01:29 AM   #4
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An LS3 automatic would likely get 22 mpg highway and a gas guzzler tax of roughly $1000
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Old 04-12-2009, 08:49 PM   #5
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It could also be that the L99 does not work well with a manual transmission, because the computer has no idea when you are going to shift, etc. Whereas with an automatic, the computer has more control over everything - so it can best utilize and control the active fuel management. And this probably also increases the average gas mileage of the entire model line.
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Old 04-12-2009, 09:24 PM   #6
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Regardless, I'm glad they offer both. Both packages are very different and it's clear to me that both target different types of individuals.
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Old 04-13-2009, 02:15 PM   #7
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A 400 HP V8 and a 426 HP V8, sharing many parts and same displacement, target "very different" types of individuals? Maybe you could say that about auto vs stick, but the engines aren't much different once you get past the fuel management that's on the L99.
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Old 04-13-2009, 02:23 PM   #8
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A 400 HP V8 and a 426 HP V8, sharing many parts and same displacement, target "very different" types of individuals? Maybe you could say that about auto vs stick, but the engines aren't much different once you get past the fuel management that's on the L99.
That is what he was saying...

L99 is auto

LS3 is stick
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Old 04-13-2009, 02:36 PM   #9
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I wish GM would build a LS3/Auto Anybody else ?
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Old 04-13-2009, 02:43 PM   #10
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I wish GM would build a LS3/Auto Anybody else ?
Anyone know if the G8 GXP gets the guzzler tax? I think that has the LS3 / Auto combo ..

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Old 04-13-2009, 02:54 PM   #11
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G8 GXP doesn't get an auto
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Old 04-13-2009, 03:01 PM   #12
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G8 GXP doesn't get an auto
Yes it does. Have driven both auto and manual versions of the GXP
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Old 04-13-2009, 03:05 PM   #13
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Thanks, but I was talking about a LS3/Auto Camaro. The Vette is lighter but seems like if they could do it with it why not camaro. ?
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Old 04-13-2009, 03:15 PM   #14
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Thanks, but I was talking about a LS3/Auto Camaro. The Vette is lighter but seems like if they could do it with it why not camaro. ?

What do you mean?

First of all the Camaro never was designed to usurp the Corvette in performance and market position. Second like people say it's all about CAFE and the competition.

There is NOTHING wrong with both combo's they are great. L99 works fine there are tons of them out there. Sure at 200,000 miles you might have a little uneven engine wear.. big deal you would of saved many gallons of gas.

And probably someone will find a way to haxxor and make and override button so it won't go into 4 cyl mode.
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Old 04-13-2009, 07:46 PM   #15
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So why is there no cam phasing for the LS3 on the Mtx? Chrysler offer VCT phasing (but no AFM) on the 5.7L Mtx Challenger w/o guzzler. VCT would be a nice addition to the LS3 IMO.

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Old 04-13-2009, 08:01 PM   #16
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YEah, the G8 GXP comes in auto, and does, i repeat DOES, get the gas guzzler tax.

I too would like a LS3 auto, tax or not. That damn active management bs stands in the way of many mods, or makes them more expensive.
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Old 04-13-2009, 08:06 PM   #17
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YEah, the G8 GXP comes in auto, and does, i repeat DOES, get the gas guzzler tax.

I too would like a LS3 auto, tax or not. That damn active management bs stands in the way of many mods, or makes them more expensive.
when did the gxp come in auto? are u sure its not the gt...is this something new for 09?
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Old 04-13-2009, 08:13 PM   #18
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the GXP comes in both auto and manual. And they both have a 415 hp LS3.
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Old 04-13-2009, 11:46 PM   #19
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Thanks, but I was talking about a LS3/Auto Camaro. The Vette is lighter but seems like if they could do it with it why not camaro. ?
highway mpg has almost nothing to do with weight, its all about areodynamics and the camaro is lacking that with the big recessed grill
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Old 04-14-2009, 02:02 AM   #20
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highway mpg has almost nothing to do with weight, its all about areodynamics and the camaro is lacking that with the big recessed grill
+1
and rpm and efficiency at that particular RPM.
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Old 04-14-2009, 02:08 AM   #21
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I wish GM would build a LS3/Auto Anybody else ?
yeah, who cares about the gas guzzler tax...
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Old 04-14-2009, 02:15 AM   #22
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i love how everyone is acting like there is this huge difference between the l99 and the ls3. Like the l99 is somehow completely inferior to it. Christ this car has been nitpicked to death about everything. Few people will be able to feel the 26 hp difference despite what they might say. The auto is going to be every bit as fast as the manual at the drag strip for the 10% of these cars will ever be there. Do you really think an extra 26 hp is going to be needed to smoke most cars at a stoplight?
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Old 04-14-2009, 03:49 AM   #23
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i love how everyone is acting like there is this huge difference between the l99 and the ls3. Like the l99 is somehow completely inferior to it. Christ this car has been nitpicked to death about everything. Few people will be able to feel the 26 hp difference despite what they might say. The auto is going to be every bit as fast as the manual at the drag strip for the 10% of these cars will ever be there. Do you really think an extra 26 hp is going to be needed to smoke most cars at a stoplight?
no but 426 sounds better than 400 =D
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Old 04-14-2009, 11:44 AM   #24
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First of all the Camaro never was designed to usurp the Corvette in performance and market position. Second like people say it's all about CAFE and the competition.

Didn't say anything about the camaro "usurping" the corvette, And yes understand about cafe and all the bs-hoops GM has to jump threw. I was compairing the LS3/Auto in the corvette, that it would work in a camaro. I think the L99 is a fine motor, I wanted the LS3 because I like to upgrade/tune to get all the HP. If it came down to a GGtax for a LS3/Auto that be fine..
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Old 04-14-2009, 10:56 PM   #25
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I'm sure the L99 can be easily tuned, pretty sure you can just globally turn off the AFM in software.
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