Let's think this through--the LS2 we know is 6.0 liters; it redlines at 6500 RPM; and it has new cylinder head (and maybe other new) technology. Yet, it is rated at only 400 HP/400TQ, about the same as the LS6, with its 5.7 liters, 6500 RPM redline and presumably older cylinder head design.
Could it be that Chevy is rating the LS2 "low" at 400 HP as a bone for us C5 Z06 folks, and it really puts out more? If a typical LS6 puts out, say, 360 RWHP, will the LS2 really put out, say, 380 RWHP, regardless of its "rated" HP?
i could see it being over, but not by much if so. cause .3L more volume should bump it up some, and then imporved whatever u wanna say should go the extra. i do think the 400/400 is the conservative easily met number. is it higher? prolly, but not as consistently as 400/400!!
ELS
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I've always wondered about the LS1 vs. LS6. The motors are essentially identical. Sure, Heads are revised, intake manifold is revised, there are lots of little tweaks. But none of the changes are inherently *more expensive*. For instance, the shape of the intake manifold has little to do with the cost of the plastic.
The Z06 costs more because it makes more HP. But if you look at the bill-of-materials that goes into the cars, there seems (at least from my superficial perspective) to be little justification for the cost differences. GM charges the extra $$ because *they can*.
The 0.3L increase in the LS2 over the LS1 is about 5%. Assuming pumping efficiency scales linearly (which it doesn't, normally, but could probably be assumed to over this short a range), that 5% delta is good for only about 19HP. Maybe they get another 30HP other changes.
I dunno.
It's really irrelevant.
The LS2 is probably capable of much more than the 400HP they're claiming, just as the LS1 was capable of more than it's 350HP (in the guise of the essentially identical LS6's 405HP). GM's ratings for the LS1 and LS6 are mostly spot-on, so there's absolutely no reason to believe the LS2 won't be, too. The LS1/LS6 differences show that GM can get the HP they want from a given engine platform. If they wanted 400HP from the LS2, I'd bet that's *exactly* what they're getting.
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Originally posted by quickSS Let's think this through--the LS2 we know is 6.0 liters; it redlines at 6500 RPM; and it has new cylinder head (and maybe other new) technology. Yet, it is rated at only 400 HP/400TQ, about the same as the LS6, with its 5.7 liters, 6500 RPM redline and presumably older cylinder head design.
Could it be that Chevy is rating the LS2 "low" at 400 HP as a bone for us C5 Z06 folks, and it really puts out more? If a typical LS6 puts out, say, 360 RWHP, will the LS2 really put out, say, 380 RWHP, regardless of its "rated" HP?
Any idle speculation?
I believe the LS2 is de-tuned or being held back like the '01 LS6.
You will find that the 350 hp rating for the LS1 is at 5200 rpms even though the rev. limiter is at 6000.
I'm not sure but I think the LS6 is also rated 405 at 6000 rpms.
As I have stated before GM does not want to crush the C5 Z06. YET. On paper that is.
10.9:1 CR 6.0 liters, 3,179lbs, Z51 package now including a M12 trans. ( been a real long time since a standard transmission choice, what's next engine choices for '06 or '07? ) the C6 Coupe is going to be a fast car.
Originally posted by FRC Tom I believe the LS2 is de-tuned or being held back like the '01 LS6.
You will find that the 350 hp rating for the LS1 is at 5200 rpms even though the rev. limiter is at 6000.
I'm not sure but I think the LS6 is also rated 405 at 6000 rpms.
As I have stated before GM does not want to crush the C5 Z06. YET. On paper that is.
10.9:1 CR 6.0 liters, 3,179lbs, Z51 package now including a M12 trans. ( been a real long time since a standard transmission choice, what's next engine choices for '06 or '07? ) the C6 Coupe is going to be a fast car.
Hey Tom looking at the CR looks like it will be hard for the C6 to be supercharged.
My 1998 LS1 Camaro SS dynoed 305 RWHP (shifting early, at 5500 RPM, not 6000, because I had a track day the following weekend and wanted a one-piece engine); my friend's 2000 Corvette LS1 on the same dyno with no RPM limits a few minutes earlier did 311 RWHP. Both were stock except for a lid and air filter. Many of you seem to be around 345-370 stock with your LS6s. That works out to about 30-50 HP, or about the diff in rated horsepower between an LS1 and an LS6 (Admitting there were some improvements to the LS1 as it evolved, especially the last 2 or 3 years when the LS6 manifold was added.).
I will find it very interesting to see what real-world RWHP the LS2 gets at the dyno. If I were Chevy, now that HP numbers are getting so big, I'd purposefully under-rate everything to make sure the gubment, the insurance cos, the Naderites, etc., stay at bay. While big numbers may help the marketing folks and sound fun to us enthusiasts, I'd find it rather interesting to have my "415" HP LS2 Z06 pull an 11.2 quarter on stock tires, letting me know Chevy was lying through its teeth! Porsche routinely seems to underrate its cars quite a bit, too, for example.
To pressurize this LS2 , they will have to drop compression way down, but that is as easy as a piston change, so why not? While this will be more than a bolt-on job for the aftermarket, of course, it will be no biggie to do this on the assembly line when the motors are built. Maybe that's what Chevy wants--less after-market competition. Clever boys!
Originally posted by Want a ZO6 Hey Tom looking at the CR looks like it will be hard for the C6 to be supercharged.
Yes it will but it can be done easy enough with the 71.06cc 6.0 heads from the Silverado, Escalde, etc. This will bring the CR down to 10.1 like the LS1. These heads are exactly like the Z06 heads just cut for a larger bore as is the LS2 head. The LS2 head has a 64cc combustion chamber like the LS6 head.
To the best of my knowledge the LS2 head will flow just like the LS6 and 6.0 #317 head.
I think that the mosts important improvement with this engine may not be seen with peak hp & tq #'s. The real improvement will probably be seen in the hp & tq coming on stronger and lower in the rpm, given the displacement increase. A more usable power band with a flatter torque curve??? Just speculation, but that is what I am most excited about. The new ls2 may be easier, quicker, and more fun to drive around at part throttle if the above is true.
Originally posted by benenati379 I think that the mosts important improvement with this engine may not be seen with peak hp & tq #'s. The real improvement will probably be seen in the hp & tq coming on stronger and lower in the rpm, given the displacement increase. A more usable power band with a flatter torque curve??? Just speculation, but that is what I am most excited about. The new ls2 may be easier, quicker, and more fun to drive around at part throttle if the above is true.
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