I was bouncing around the internet and found this corvette message board.

http://forums.corvetteforum.com/archive/in...p/t-809726.html (http://forums.corvetteforum.com/archive/index.php/t-809726.html)

There are some very knowlegable people there who seem to think that 400 HP for the LS2 is underrated by roughly 15-20 HP.

And there are others who believe that if it comes in at 400 then it will only be a matter of $100 valves and $200 dollar cams to get this engine to 440HP while maintaining a "stock idle / drivability / emissions / reliability."

Just something to think about until someone gets one on a dyno.

Interesting, thanks for the info.

Just something to think about until someone gets one on a dyno.


I believe GM has a power and torque curve dyno of the LS2 for the Vette out. In fact I think someone has posted it in another link here. 400 HP and 400 TQ if memory serves me correctly.

That could be just what GM says too, so yes it will be interesting when we start to get some owners dynoing their own LS2 vehicles. :)

IM curious to know how these people know this when the engine isn't in production yet, let alone has an aftermarket research put into it...

whatever 351 rwhp is equal to at the flywheel. Also i dont know wether it is a A4 of M6 or how many miles were on it

http://www.ls1tech.com/GTO/dynoLS2gtoStock.gif

someone want to explain how a person is able to chassis dyno an 05 GTO already seeing as they probably arn't made yet, let alone made the trip to the states? And don't tell me its in aussie land because they dont use HP and TQ measurements.

This one smells a bit....funny.

Maybe it's a hijacked document from GM with a prototype LS2 engine. :blink:

Why would GM bother with a Chassis dyno when they only give Engine dyno numbers?

Originally posted by Nocturn@Aug 12 2004, 12:29 AM
Why would GM bother with a Chassis dyno when they only give Engine dyno numbers?
I'm sure every car manufacturer uses a chassis dyno for their own testing because it's the number that really matters.

351 at the wheels equates to 412.9 horsepower w/15% drivetrain losses

If the LS2 were truly this powerful, seems the C6 tested by motortrend would have been quicker. It was 3 tenths slower than their time for an '04 Z06 which is rated at 405 HP.

Originally posted by forestdweller+Aug 12 2004, 11:00 AM--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (forestdweller @ Aug 12 2004, 11:00 AM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-Nocturn@Aug 12 2004, 12:29 AM
Why would GM bother with a Chassis dyno when they only give Engine dyno numbers?
I'm sure every car manufacturer uses a chassis dyno for their own testing because it's the number that really matters.

351 at the wheels equates to 412.9 horsepower w/15% drivetrain losses

If the LS2 were truly this powerful, seems the C6 tested by motortrend would have been quicker. It was 3 tenths slower than their time for an '04 Z06 which is rated at 405 HP. [/b][/quote]
Yeah that's kind of the jist of the posts on the message board I linked to. GM didn't want to make a corvette that was faster than the previous years Z06 model. Or at least they didn't want to publicize this fact if they did.

I wouldn't be surprised to find out it's actually 410-415 horsepower. But then again I wouldn't be too surprised to find out it is 400 HP. We'll see.

Its GM, what need have they for RWHP numberds when they have NEVER used them to sell anything. The whole dyno doesn't make logical sence as it appears to be an 05 chassis dynoed in the states..and there are so many things wronge with that sentence at this point in time that Im forced to call the BS Flag. :bs:

BUT, that is what I would expect from an LS2 power wise, so at least they did a good job of making it appear real.

I have no idea if its real or not but here is the post with some info http://www.ls1tech.com/forums/showthread.php?t=198728

I've been doing some thinking about the low dyno numbers vs. expected ouptput of the LS2. Here's my take. It should be making around 435-440 crank hp with the specs that GM has listed. That's about 375 hp to the rear wheels on a Corvette. Now, the dyno run was done on a GTO, which has similar drivetrain losses, but a more restirctive intake and exhaust. So lets assume those two items account for 10-15 hp, which is a good estimate. That still leaves 10-15 hp to knock off. It's well known that GM does torque management on vehicles with automatic transmissions. It is entirely possible that they are using the same tricks to limit the hp and keep things spot on. I"d love to see what happens when someone finally takes a peek at the ECU with LS2 Edit. I bet there are some free hp to be found on a stock car with some electronic tweaking.

Now for some insight into my logic behind the low hp ratings. The LS2 uses the same cam profile as the first year LS6 engine, which was rated at 385 hp. Just the displacement increase would bump hp to 405 hp. Now add the improved heads, intake and 0.8 points highter compression ratio and if that doesn't get you an additional 30 hp I'd be shocked. At the least, I'd expect 20-25 hp from that. BTW, I got bored a while back and did some playing around with Engine Analyzer to verify my suspicions. Of course the only way we will know if I'm correct is to wait till the '05s become available and someone dynoes a stock M6 then tweaks it with LS2 Edit and dyno's it again.

Im curious to know where you got your LS2 information about the cam specs and all. From everything i'v read it seems the LS2 is supposed to be rated at 400-410 which would put it right on track with what this fake dyno is showing. The GTO and vette do have similiar drive trian loss but listen to a vettes exhaust and then to a GTO's and tell me which one is more restrictive.

http://www.corvetteactioncenter.com/specs/...05/sequel5.html (http://www.corvetteactioncenter.com/specs/2005/sequel5.html)

01 LS6 heads, 01 LS6 cam, MAF screen installed, intake and exhaust improvements.

linky no worky :(