LS3 VS L99

[2010ssraper]

What is the difference between the two? I know the LS3 is the M6 and the L99 is the A6 and the M6 is lighter than the L99. But what is the difference in the engines???

[mlee]

VVT Variable Valve Timing and DOD Displacement on Demand for the L99. DOD sometimes called AFM Active Fuel Management is a system that drops the engine to 4 cylinder mode to save fuel. Keeps the L99 A6 at the same gas mileage numbers as the LS3 M6

Now that you have the buzz words and accronyms... search around as there are tons of threads on this stuff...

[2010ssraper]

Originally Posted by mlee

VVT Variable Valve Timing and DOD Displacement on Demand for the L99. DOD sometimes called AFM Active Fuel Management is a system that drops the engine to 4 cylinder mode to save fuel. Keeps the L99 A6 at the same gas mileage numbers as the LS3 M6

is the cause to why it makes about 26HP less?

[mlee]

Originally Posted by 2010ssraper

is the cause to why it makes about 26HP less?

Yes pretty much...

[2010ssraper]

Originally Posted by mlee

Yes pretty much...

Thats a little sad:( Otherwise don't they have the same exact engine specs?

[mlee]

Originally Posted by 2010ssraper

Thats a little sad:( Otherwise don't they have the same exact engine specs?

Yeah... but with some trans tuning the L99 really closes that gap... It's actally a sore subject, and some, like myself, end up tuning out AFM.

[VADER SS L99]

Originally Posted by 2010ssraper

is the cause to why it makes about 26HP less?

The reason the L99 makes less power than the LS3 is that GM with all its wisdom decided to put a baby cam in the car. I mean I dont even think the cam has over .500 of lift. The compression is a little lwer too because of valve reliefs but the heads, intake, crank, block, and rods are the same. The only major differences is the lifters, cam, pistons,intake valves and VVT timing chain. If GM had put the same size VVT cam in the L99 then it would have made more power than the LS3 and I could then justify my purchase being 1k more than the Ls3 manual combo.

[2010ssraper]

Originally Posted by VADER SS L99

The reason the L99 makes less power than the LS3 is that GM with all its wisdom decided to put a baby cam in the car. I mean I dont even think the cam has over .500 of lift. The compression is a little lwer too because of valve reliefs but the heads, intake, crank, block, and rods are the same. The only major differences is the lifters, cam, pistons,intake valves and VVT timing chain. If GM had put the same size VVT cam in the L99 then it would have made more power than the LS3 and I could then justify my purchase being 1k more than the Ls3 manual combo.

So your saying if they used the same exact cam from the LS3 in the L99 then the L99 would have more power?

[moiy1983]

Everyone is entitled to ther opinion so here is mine. I currently own the manual 6 speed and it has CAI,HEADERS,CATBACK,CUSTOM CAM, SHORT THORW SHIFTER,& CUSTOM TUNE and that adds up 464rwhp and 430rwtq. It's a blast to drive. My problem with the car is I have a hard time launching the car at the track to get good 1/4 times at the track. If i could go back to when i was purchasing it i would probably lean more on buying the automatic. 26 horespower can be made up very easily but the consitency you get out of it in my opinion outways the 26 less horspower! but that doesnt mean without some practice you cant get it done! goodluck!

[trudawg660]

Originally Posted by 2010ssraper

So your saying if they used the same exact cam from the LS3 in the L99 then the L99 would have more power?

yes it would but to do that u would have to change the lifter and springs, deleting VVT and etc on the DOD or AFM cylinders. and if ur going to pay that much to do that u might as well get a better aftermarket cam than the stock ls3 cam.

[WeeZee]

Originally Posted by moiy1983

Everyone is entitled to ther opinion so here is mine. I currently own the manual 6 speed and it has CAI,HEADERS,CATBACK,CUSTOM CAM, SHORT THORW SHIFTER,& CUSTOM TUNE and that adds up 464rwhp and 430rwtq. It's a blast to drive. My problem with the car is I have a hard time launching the car at the track to get good 1/4 times at the track. If i could go back to when i was purchasing it i would probably lean more on buying the automatic. 26 horespower can be made up very easily but the consitency you get out of it in my opinion outways the 26 less horspower! but that doesnt mean without some practice you cant get it done! goodluck!

Easy trick for good launch bro. Nitto NT05 275/35/20 drag radials @ 30psi. Slip the clutch at 3000 rpm's, ease into the gas pedal while keeping consistant clutch with ur left foot off the line. when u feel the grab and bog alittle, dump the clutch and powershift. I have had 4 cars with Nitto drag radials and they all cut 1.7-1.8 60ft's (2004 350z ProCharged, 96 Mustang GT, 2003 Mach1 & 02 CamaroSS)

[2010ssraper]

Originally Posted by trudawg660

yes it would but to do that u would have to change the lifter and springs, deleting VVT and etc on the DOD or AFM cylinders. and if ur going to pay that much to do that u might as well get a better aftermarket cam than the stock ls3 cam.

Well I honestly don't mind about deleting the VVT or whatever, thats perfectly fine with me. I kind of was leaning towards getting the LG Motorsports G6X3 cam anyways. Hey BTW does anyone know of a good cam from LG Motorsports to use for a TT setup?

[mlee]

Originally Posted by moiy1983

Everyone is entitled to ther opinion so here is mine. I currently own the manual 6 speed and it has CAI,HEADERS,CATBACK,CUSTOM CAM, SHORT THORW SHIFTER,& CUSTOM TUNE and that adds up 464rwhp and 430rwtq. It's a blast to drive. My problem with the car is I have a hard time launching the car at the track to get good 1/4 times at the track. If i could go back to when i was purchasing it i would probably lean more on buying the automatic. 26 horespower can be made up very easily but the consitency you get out of it in my opinion outways the 26 less horspower! but that doesnt mean without some practice you cant get it done! goodluck!

Have fun learning it... I actually get bored because all my runs are identical. Unless I have a new mod to test it's just the same ole same ole.

After 3 or 4 runs with timeslips that look like they came off a copy machine... what's the use.

Bracket racing here I come...

[JohnJ@Texas-Speed]

Make no mistake the L99 has the potential to make more power across the board thanks to the VVT stuff. Give it time, I believe with a custom TSP camshaft & PRC's new cylinder head castings we'll see 500rwhp A6 L99 cars!!

Just gotta get those stinkin lifters out of that thing!!