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

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Old 10-18-2011, 10:04 PM   #1
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differences between the LS3 & L99

What are the differences between the LS3 & L99? Which one is most common in the 2SS camaro's?
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Old 10-18-2011, 10:09 PM   #2
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well a 1ss and 2ss come with the same engines. either a LS3 or a l99.

l99= auto
LS3= manual

you will find most people drive a auto, so most have l99.

l99 400HP 420TQ

LS3 426HP 420TQ

L99 has VVT
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Old 10-18-2011, 10:12 PM   #3
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LS3 = More Fun
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Old 10-18-2011, 10:45 PM   #4
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Old 10-18-2011, 11:05 PM   #5
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What are the differences between the LS3 & L99? Which one is most common in the 2SS camaro's?
A quick summary would be that the L99 has less compression, Variable Valve Timing and active Fuel management which deactivates cylinders while you are light on the throttle.
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Old 10-18-2011, 11:07 PM   #6
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A quick summary would be that the L99 has less compression, Variable Valve Timing and active Fuel management which deactivates cylinders while you are light on the throttle.
2nd Most helpful answer so far lol.
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Old 10-19-2011, 07:23 AM   #7
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The LS3 is decently fast, the L99 is a joke in stock form.
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Old 10-19-2011, 08:15 AM   #8
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L99 = AFM.

AFM + exhaust = drone.

AFM + loud exhaust = drone that'll want to make you wanna rip your head off.

My proposal is this if you get a L99. AFM + tune - resonators + great exhaust = badass exhaust FTW!
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Old 10-19-2011, 08:17 AM   #9
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Not another M6 vs. A6 blog. Get what you want, both are great cars. L99 is just as fast because you have to factor in driver shifting errors with a LS3
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Old 10-19-2011, 08:26 AM   #10
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L99 = AFM.

AFM + exhaust = drone.

AFM + loud exhaust = drone that'll want to make you wanna rip your head off.

My proposal is this if you get a L99. AFM + tune - resonators + great exhaust = badass exhaust FTW!

they both drone LS3 and L99. even if the l99 didn't have AFM it would still have drone with some exhaust just the LS3.

AFM creates a bad sounding drone, but doesn't really create drone as the car will drone either way.
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Old 10-19-2011, 09:15 AM   #11
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The main difference can be summed up as an auto trans car will cost more to mod due to all the parts that will need to be changed to make it like the LS3, of course if you only plan to go as far as intake, headers, and exhaust then it doesn't really matter.
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Old 10-19-2011, 09:40 AM   #12
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The LS3 is decently fast, the L99 is a joke in stock form.

From a dig I'll get you every time.
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Old 10-19-2011, 10:04 AM   #13
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I wonder what the difference truly would be. I am interested in a L99 with a aggressive exhaust, but I don't want to tune and lose my warranty. I have no idea how bad the drone could be. I have a small drone on my V6 with the MRT 2.0. If it's only that moderate I will be fine. Otherwise it may be a issue

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Originally Posted by mikeSS View Post
they both drone LS3 and L99. even if the l99 didn't have AFM it would still have drone with some exhaust just the LS3.

AFM creates a bad sounding drone, but doesn't really create drone as the car will drone either way.
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Old 10-19-2011, 10:07 AM   #14
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Originally Posted by LED KING View Post
I wonder what the difference truly would be. I am interested in a L99 with a aggressive exhaust, but I don't want to tune and lose my warranty. I have no idea how bad the drone could be. I have a small drone on my V6 with the MRT 2.0. If it's only that moderate I will be fine. Otherwise it may be a issue
well most drone from our cars is a deep sounding, humming type sound. i had a GMPP part on my LS3 and it had a drone like that. but the AFM will sound like a 4 banger at droning speeds/RPMs
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Old 10-19-2011, 10:09 AM   #15
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It would be nice to know someone who has a L99 and the Outlaw for me to take a drive in, but that's unlikey to happen. I feel like I should get the LS3 just to avoid the 4 cylinder AFM crap, but this Camaro would be my daily driver. Decisions decisions
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Old 10-19-2011, 12:36 PM   #16
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From a dig I'll get you every time.
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Old 10-19-2011, 01:02 PM   #17
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Not another M6 vs. A6 blog. Get what you want, both are great cars. L99 is just as fast because you have to factor in driver shifting errors with a LS3
"Shifting errors"? You mean like when I forget to put the car in a forward gear, or when I forgot the let the clutch back out after hitting 4rd? Or you do you mean like when you forget to hit 2nd and go right to 3rd? I hate it when I do that... Kills my times.
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Old 10-19-2011, 01:10 PM   #18
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The last two posts have been fantastic.... best part is most all of us here are modified. So the comparision is garbage or referencing a stock L99. Weird that we yet again have to justify differences between fellow Camaro owners... how do all of you keep managing to sit in such a way that a stick gets lodged that tight?
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Old 10-19-2011, 01:20 PM   #19
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Not another M6 vs. A6 blog. Get what you want, both are great cars. L99 is just as fast because you have to factor in driver shifting errors with a LS3
when trying to see what car is faster on paper, you have to put both cars a perfect world, with no errors. you act like you are counting on the manual driver to mess up. last time i checked, i did 5 runs on the drag strip when i went. so its not like one race, and call it a day to see what car is faster.

its been proven, a stock LS3 is little faster than a stock l99. but of course a l99 can be made to beat Ls3s all day.
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Old 10-19-2011, 01:26 PM   #20
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The LS3 is decently fast, the L99 is a joke in stock form.
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Old 10-19-2011, 01:30 PM   #21
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It would be easier to answer your question if we knew your intentions.

The difference, as was stated, is the AFM (formerly known as DOD, or dispoacement on demand) where 4 cylinders shut down at low load.

The L99 is lower in compression due to the cupped pistonheads and VVT cam. As a result is 26 bhp less than the LS3. (400-L99 and 426-LS3) However the L99 is geared differently in the rear end so it makes up for it. Tests as faster 0-60 by a tenth or so yet slower in the quarter mile by a tenth or so. The gears being key.

If you plan on modding then there are more immediate gains to be had with the L99. A cam swap can get you bigger gains with the same cam. You'll get most of your initial 26 lost bph back plus the normal gain. So with an equal cam you are actually a tad faster. But that's modding. It goes any direction from there.

It all depends on what you are planning to do. The stock LS3 will 'FEEL' quicker but it really isn't. So it all depends on what you want. Want to beat that Mustang to the next light? Go L99. Want to beat him on a road course, go LS3.






Quote:
Originally Posted by bhillakaiceberg View Post
Not another M6 vs. A6 blog. Get what you want, both are great cars. L99 is just as fast because you have to factor in driver shifting errors with a LS3
There were others?

Quote:
Originally Posted by LED KING View Post
It would be nice to know someone who has a L99 and the Outlaw for me to take a drive in, but that's unlikey to happen. I feel like I should get the LS3 just to avoid the 4 cylinder AFM crap, but this Camaro would be my daily driver. Decisions decisions
I think you'll find that someone close to you would be perfectly willing to meet you. Especially if you are a Sooners fan...... I would be, but I"m anything but stock anymore and I don't live there. lol

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The last two posts have been fantastic.... best part is most all of us here are modified. So the comparision is garbage or referencing a stock L99. Weird that we yet again have to justify differences between fellow Camaro owners... how do all of you keep managing to sit in such a way that a stick gets lodged that tight?
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Old 10-19-2011, 01:33 PM   #22
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Quote:
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when trying to see what car is faster on paper, you have to put both cars a perfect world, with no errors. you act like you are counting on the manual driver to mess up. last time i checked, i did 5 runs on the drag strip when i went. so its not like one race, and call it a day to see what car is faster.

its been proven, a stock LS3 is little faster than a stock l99. but of course a l99 can be made to beat Ls3s all day.


I compare them by the average of the cars. Most of the magazines and tests agreed that the L99 was a tenth qucker 0-60 but slower in the quarter mile. Due to the rear end gears I assume.
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Old 10-19-2011, 01:46 PM   #23
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I believe I can! At least I hope. I am scared of the potential drone that may lie in the L99. Idk if you would want me to ride in your Camaro... I am a Cowboy fan Although I wouldn't mind meeting you at CFIII!

I think you'll find that someone close to you would be perfectly willing to meet you. Especially if you are a Sooners fan...... I would be, but I"m anything but stock anymore and I don't live there. lol

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Old 10-19-2011, 01:58 PM   #24
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if your going to have fun running around town,get a stick.if you are going to drag,get an auto.back in my day,you had a 4 speed if you were going to drag.all the auto cars shifted too slow.not so anymore.
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Old 10-19-2011, 02:23 PM   #25
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I believe I can! At least I hope. I am scared of the potential drone that may lie in the L99. Idk if you would want me to ride in your Camaro... I am a Cowboy fan Although I wouldn't mind meeting you at CFIII!
I'll be there for sure.

It's hard for me to be objective anymore. I've done so much. And defended the L99 guys on the strip.
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