Abdulla

Hi,

I know its a stupid question , I'm sorry .

but some one asked me that .... " LS2 has more c.i. than ZO6 and has 90 mm TB and has the same heads with ZO6 .... so why it has less power than ZO6 ?? or let say a similar power ..... why ?? "

I answered him that the problem is that LS2 has smaller cam than what ZO6 has .... I am not sure about the spec. of LS2's cam but I am sure its smaller.

did I answered him right ???

any help ??


thanks

cyphur

iTrader: (10)

Also the Z06 motor is tuned to be a higher performing motor. The LS2 is not. Its intended to be what the LS1 is to the LS6. You'll see the difference when the LS7? comes out.

Abdulla

thanks for this quick responed

yeah , I think you are right

thanks again

WhiteDiamond

The LS2 is using the LS6 cam, but the 2001 spec'd cam. If you compare dyno's from 2001 Z06's and the current dyno's from LS2 C6's, you will see that the upper rpm ranges of the LS2 do not continue to increase like the LS6 version. I believe GM is pulling timing in the upper RPM ranges, as the LS2 should behave very similar(same heads, better intake, higher compression, freer exhaust, and more displacement) but it doesn't.

Todd

Z06Cam

Since LS2's seem to be dynoing right with 02-04 Z06's, and have similar heads and cam, but more displacement, I would agree that the reason probably has to do with tuning.

ws6black2000conv

Maybe gm can up the HP in the next couple of years to sell more corvettes. Just like they did on the ls1.

Abdulla

Good points

thanks all

niphilli

I think it is all in the camshaft guys....The tuning on the LS6 was actually very conservative compared to early LS1s...I dont think they have detuned the motor. I also dont think that the added diameter on the intake/TB is going to help any...That was not a restriction in the first place in the LS6 motor...It breathed well enough for the cubes and camshaft that came from the factory.

TD's z

the ls2 is detuned i agree that a 5.7 don't need a 90mm tb and neither does a 6.0 but it certianly is not hurting the ls2 they are running the same cam and better intake the power is their it's just not tuned in besides i'd rather have a 90mm anyway

Louis

iTrader: (7)

remember, they are not going to throw a LS6 tune into something that has almost 11:1 compression either.

Lets add it up:

Stock 03 Z- 355 rwhp from the dozens Ive dynoed-
add 14 cubes- ( Given it is making 1 hp/CID, it should in theory gain 14)
add 90 mil- say 10 at the least. A stock Z with a ported TB gains a minimum of 4, and thats still 78~ mil.
Add 4 tenths of compression
subtract for cam- less 10.

if you did all of that to your 03 Z, it would be in the 370s range with comparable tunes, and exhaust, and intake systems.

Given time, Im sure the LS2 will be making that when we finally get to compare apples to apples.

jRaskell

iTrader: (1)

Need to keep in mind that GM looks at engine development from a goals point of view. When the LS1 was first developed, their target was 350hp with the entire engine being under a certain amount of weight. There were only lose displacement guidelines in place, and the overall engine development was all focused on that 350hp target.

With the LS2, I'm sure they pretty much did the same thing. They wanted a 400hp engine. They knew as well as we do they could get more than 400hp out of a 6.0L LS based block, but 400hp became the target (however that was determined), the goal, and the ultimate outcome. And it certainly leaves them room for improvements for iterative model years, each year could easily see a 5-10hp bump from minor changes here and there. I'm sure the target hp mark was also selected to maintain an appropriate gap with whatever target they've set for the LS7 variant as well. These days it's more about marketing than what's technically possible. The F-body HP ratings are a perfect example of how GMs marketing department influences the rest of the company. Not saying it's wrong. It is what it is. I personally enjoy the fact that many people believe I only have about 300 crank hp when I've got a dyno proven 300rwhp (for all intents and purposes, I realize I'm technically missing a few hp).

TransAm00

well it needs to hurry cause i'm trying to decide between an 04 Z06 or a C6

onfire

iTrader: (17)

GM picked 400 for the ls2 to keep the zo6 guys from howling that a "base" vette has more hp.

Damian

iTrader: (89)

I watched an 04 Z06 and a C6 race the other night. The Z06 was out in front 3 cars @ the end of the race...

StoleIt

iTrader: (3)

there's alot that can be attributed too, driver skill, traction, etc...if a skilled driver in a z06 raced a not so skilled driver in a c6 and the z06 caught traction...well we all know how cases where cars don't get traction turn out. Have em race from like a 10 mph roll so you shouldn't have to worry about how launches better.

Damian

iTrader: (89)

I agree. However i've riden & driven both. The 04 Z's are faster.

I'm not a fan of the C6 personally. The only thing about the car that impresses me is the interior...

METALBEAST

iTrader: (1)

Just curious how have you driven one? Do you work for a dealer? Not being rude at all just wondering. Still relatively new here.

Qwik03

The LS2 is really under cammed the thing just pulls nice and smooth all the way up through the powerband.(It isn't peaky like the LS6)

I have driven both and the 02-04 Z06 is a Quicker car.(1/4 and mph)

The 05 GTO and Vette feel faster until about 4000 rpms then the cam in the Z06 takes over.

There will be bolton 400+ rwhp LS2's

There will be 450+ rwhp big cammed LS2's

Give it time and you will be amazed what the LS2 is able to do!!!

Brandin

04 C5 Coupe

Damian

iTrader: (89)

Yes, I worked for one of the largest Corvette Dealers in the country briefly, and luckily I was there in time for the first C6 to arrive. Everyone in the shop got to drive it around the block

CSiJason

LOL I feel sorry for the sap that buys that car... Its been around the block and back a dozen times!