JakeRobb

The torque curve might be flat. If the horsepower curve is flat, though, that means GM has somehow defied the laws of physics. Either that or we're not graphing HP vs RPM.

ImportedRoomate

638hp from idle would be sweet.

Made possible through an ingenious combination of cylinder deactivation, boost, nitrous, and the use of both diesel and gasoline at low and high rpms respectively.

JakeRobb

Assuming a 700rpm idle, that would mean 4,787 lb-ft of torque. Assuming a perfectly flat torque curve (which therefore shouldn't be called a "curve"), that would translate to 5468hp at 6000rpm. So, apparently you should be driving a nitro funny car.

HAZ-Matt

He might be talking about long tube headers. People on corvetteforum seem to say that you can get about 50HP after tune on the LS7 Z with LTs. I have no idea if that is really true or not.

Northwest94Z

I've heard of 50 HP gains with LT's and a tune but most of the power in these cases comes from the tune not the LT's. A straight tune on a Z06 can net you at least 20 HP. It all depends on how close to the edge you want to take it. It's all great until you cross the line lean out and find yourself on the hook for a new LS7. Not cheap.

99SilverSS

Well I was impressed when it was thought to be 620hp and now that it's official at 638hp I'm 18 more ponies impressed.

Looking forward to the mag tests and many youtube video's of production cars showing the car doing what it was made to do.

Eric Bryant

No need to violate the laws of physics - if airflow is held constant, then torque will drop off with increasing RPM and horsepower would remain constant.

1fastdog

I can tell you the torque under the curve is quite "chubby" and stout from lower RPM all the way to 6600.

BTW, I'm not certain if this info is out there, but it probably is:
The new Eaton 4-lobe blower design is 10 db quieter than prior Eaton designs due to very close tolerances and a final powder coating on the lobes which "wears in". Parasitic loss is 35% less than prior Eatons.

The 6.2 block is 20% stronger, with thicker bulkheads and improved machining. This block will be used in standard LS3s for 2009. These blocks are bored and honed with a deck plate.
The fuel rails are fed from the center to keep pressures up to all of the injectors.

I could say more, but the black Suburbans know exactly where I live...

JakeRobb

That would allow for a flat section of the horsepower curve, likely near the top of the RPM range.

A completely flat horsepower curve is impossible for an internal combustion engine.

99SilverSS

Could you confirm nor deny that "IF" the Camaro gets the LS3 in 2009 it will have this newer and improved 6.2L block?

1fastdog

Well... that's an excellently worded question. Worthy of any clever barrister standing before the bar....

My own personal opinion leads me to hope that Camaro fans will be undisappointed by the possible engine options Chevrolet might have in store for them.

I'm confident that the faithful will be rewarded.

JakeRobb

When the LS9 came out, the GM press release said that all LS3's will benefit from the strengthened block design. We can safely assume that if Camaro gets the LS3, it will get the new, stronger version.

The press release did not say that the LS3 would be using the spin-casting technique. AFAIK the LS3 does not use cast-iron cylinder liners, and therefore I don't think it will get the deck plate boring and honing process.

99SilverSS

Sounds good to me. Now we just need the LS3 and well the Camaro too!

HAZ-Matt

HP=Torque X RPM / 5252

If we want constant 100HP for example, then you get a torque equation that says

Torque = 525200 / RPM

You get a torque curve that is a hyperbola. As long as the idle RPM is not too low resulting in undefined or really large amounts of torque, I think it would be possible if you went with infinitely variable valve management of some sort. So hypothetically possible, maybe not practically possible.

JakeRobb

And what I'm saying is that's impossible for an internal combustion engine.