TTRotary

The engines are not overrated. If they were, GM would lose its certification credentials. All the LS engines, including the LS7 produce within +/- 5hp of their stated crank HP. High dyno numbers are just that: high. That is why you don't rely on them as an absolute measure of power.

My car (05 LS2) dynoed 360 here in Socal. Another guy with an 05 at another dyno only got 345. Is my car faster? Is my engine underrated? Do I have a ringer? The answer to all three is: NO. Both cars make the same at the crank more or less. The difference is that the dyno I was on reads higher.

The same dynos that produced 345 RWHP LS2s will produce 380RWHP LS3 readings.

Finally, HP loss on the Vette is a constant 50HP. Expressed as a percentage for the 08 C6, it is 11.46%, not 17%. Thank god.

LS1LT1

That's possible though I think it's rear wheel dyno number results might turn out to be right in line with it's 6 crank hp rating.


The first car dyno'd was an automatic without the NPP but so far all other dynos posted were with the NPP and were also manuals as well.

LS1LT1

Dyno variances, weather conditions and the corresponding dyno correction factors and even vehicle miles and the dyno's condition/calibrations are all reasons for the varying results.

32valves

if that gets you exited then your looking at 490+ Hp going by 20%!!!!! Hell, why we're at it why don't we use the 60's SAE gross at about 580HP!!!!!




the cars are SAE certified at 436HP or you can tell your friends just under 400 at the tires........why isn't that good enough?

SpinMonster

For the guy that doesnt want to do any mods it is a great step up. For the guy that puts the same heads on his car, its 15rwhp more due to displacement.

You may not fall into any of the above groups so your rant is understandable but I fail to see how anyone wouldnt be happy if their car came that way from the factory. The wheels on all of the corvettes from birth have been ugly in my opinion but hey that has an easy fix.

For what its worth it is for some people a hurt to see the car they own outdone but posting all the negatives about an improvement just makes one look jealous. Enjoy what you have and by the time you buy a new one in a few years, todays 2008 will not be state of the art.

Vetteoholic

I was always told it was in the range of 15-17% on a dyno jet. That would make sense because every car I had dyno'd going by the 17% figure was almost dead on with the factory crank HP ratings.
My C6 dyno'd 344 on the Dyno Jet which at 17%= 403 HP/Crank. At even 12% that would mean my C6 only has 385HP/Crank. All the Vette fanatics & tuners I know have all said at least 15% at a minimum. A couple of them actually said 18%....That may be pushing it though.
That was a good response, but the guy who owns Vette Tech and did all the amazing work on my Z06 also goes by 17% So I'm sticking with that figure.

Vetteoholic

Not sure what you meant here but I'm not excited about it, I don't even own an 08'. I just think it's nice that they are pushing out some good stock numbers. If that's what you meant?

Fuego

big case of denial here. three different cards were tested on two different dynos- both showing almost the exact same numbers. If you don't think engines get underrated sometimes, then you haven't been paying attention to ls1 power figures or even the '03-'04 cobras- both of those motors produced significantly more power than they were rated at.

jsk96z28

Everybody is going ga ga over 40hp for the ls3's, my point is it isn't that big a deal, and not worth taking the hit by dumping out of a ls2 so early. There isn't much out there that can compete, and that 40hp can be made up if wanted. I'm going to SC and 410 anyway, so it really doesn't matter what the ls3 is dyno'ing at, I would be upgrading that as well, its still not enough.

jschindler

It's SAE Certified - Everyone needs to accept that horsepower ratings are going through another change. You can't compare them to previous ratings and assume they are under rated. They are what they are.

TTRotary

Thank you for your silly response. I'm not the one who is in denial . I'm the guy with 360RWHP bone stock on a dynojet 248C, SAE corrected. So I guess by the 17% logic, I have 421crank. Woohoo. Must have one of those underrated engines

b005td

damn its going to take ALOT for us with LS1 to catch up

BRCC

We just need to see some track times when people get some miles on their cars. Taking the 18% loss factor as max 436Hp x .82 (18%loss) =357.5Hp and no dyno on a 08 is that low, not even the 430Hp Auto. So what gives. Base 430 is a 30 hp gain from last year and should be 24.6 at the RW, 436 is a 36 hp gain and should be 29.5 at the RW. Who knows, matter of fact who cares until we see performance actuals and not published GM figures which 05 ~ 07 were beat in real life by actuals on the track.

Skunkworks

Not to start anything but as torque or HP increases so do sliding forces on gears, bearing loads also increase and a host of other variables.

Although a fixed multiplier can't be used for 6-speed manual, it would likely resemble a 2nd or 3rd order polynomial.


Mike

Vetteoholic

Yeah, and I have 403 crank by the 17% logic which is right on the money like I said -goodbye

Fuego

what's so silly? I give 2 examples of underrated motors to prove my point and what do you have (besides a dyno shop that was a little freindly to you)?Go get an 08 so you can stop hatin'.It's possible you just have a stout ls2.Also, the power quoted by a manufacturer is based on a number that even the weakest motor of the bunch will still produce.Until you show results from a low powered 08, you don't have sh*&. I already see promising evidence from 3 cars and 2 seperate shops.I'm sure they got together a fudged the same results just to get your panties in a bunch.
....and you'll still be seeing tail lights from the '08's

TTRotary

Absolutely. I wanted to keep it simple for the power range we are discussing, and avoid the arbitrary percentage nonsense.

Turbooo2u

When you figure in TM, the 08's will be a 12.3-12.4 quarter mile times all day long. About what the C5Zs were running 4 years ago.

Fore58

I just don't believe that 36 crank hp would get you in the high 11's, unless this car is well underrated. High 11's would put this car right with the C6 Z06. 12.3-12.4 is very quick for a stock sport car.

Mike Campbell

You know this whole thing sort of reminds me of back in the 90's when they upped the HP on the regular C4's and they performed almost as well as the ZR'-1s. Took a ton of sales away & eventually killed the
ZR-1's. Could this do the same to the ZO6's ??? Or, will GM up the HP on the Z's too? By the way, a good running LS3 probably will on a cool day & good track crack the high 11's. Especially with an A6. Look at the times of some stock LS2's now. The Z's always have traction issues & when they really hook up, that's rare.