From the specs listed in C&D for the new vette, I think the LS2 is underrated at 400 h.p. It's a 6.0 with high compression (10.9:1 over the LS1 10.1:1), LQ4 heads, better exhaust and induction, and a higher lift cam (LS6 cam?). It also has a higher redline (6500) that I think is to take advantage of what I suspect IS a LS6 cam within. I'm thinking it should have about 20 more peak ponies than the LS6 with alot more torque under the curve. If one were to get the auto and slide in a high stall converter with DRs, I'm betting consistent elevens would be easy.

 

It has to be underrated. Why would it have less hp that the current LS-6?

 

If you use the formula hp=torque*RPM/5252

400*6000/5252 = 457.

 

The only stats I can find (on chevy's site) say 400TQ at 4400RPM, not at 6,000 RPM.

Am I missing something?

 

!!!!
Are you sure thats where it achieves peak HP though?

 

That equation would only work if you used the torque the engine made at the rpm specified in the equation. The LS2 is definately nto making 400lb-ft of torque at 6000rpms. 6000rpm is like the engines readline.

The only number we can approximate with that equation is that if say, the teh torque peaks around 4400rpm (not sure, just guessing) at that given point in time the engine is making about 335hp.

 

Let me go over this a step at a time.

400 (peak torque) * RPM (where peak hp is supposed to occur) / 5252.

so (400*6000)/5252= 457.

Redline on the LS2 is 6500 RPM.

 

NO, the equation is torque*RPM/5252=HP. You don't use the RPM where peak HP is supposed to occur, you use the RPM that you have a torque number for.

So you can take torque at any RPM and find out how much HP it's making at that RPM.

The LS2 makes PEAK TORQUE at 4400 RPM, and peak HP at 6,000 RPM. The LS2 IS NOT making 400ft-lbs at 6,000 RPM (as far as anyone knows or has been stated), so your equation is wrong.

EDIT: See Steve0's post, he's correct in what he said.

 

you guys are right that the equation is TQ * RPM/5252 = HP. so you can't just plug in 400hp in place of torque and claim the output is torque.

BUT

if you use some algebra and just move everything but TQ from the left to the right side of the equation you get:

TQ = HP * 5252/RPM

now you CAN plug in 400hp into that equation and get the TQ output of the engine @RPM.

TQ = 400hp * 5252/6000 rpm
TQ = 350 lb-ft @ 6000 rpm

this is how the math works out anyway. whether that's the true number or not.... i guess we'll have to see the torque curves when someone puts a C6 on the treadmill...