Isn't this a repost?
Yep, those have been posted here once or twice, that HP loss seems pretty standard. GM seems to be not underrating their motors like they once haveSo factory horsepower rating is supposed to be around 426, but the only dyno i have seen the SS camaro dynoed at 364 is there really a 64 horsepower loss just through the drivetrain thats a pretty big leap between numbers. I know factory numbers vary from actual dynometers but really?? Check out the link and let me know some input. I know that is still quite a few horsies but I may just be bein greedy.
Also, this was an awesome all around, to the point, consise and pretty informative video going over the three new pony cars. Check it out too!
^^^ It's not the transmission, it's then engine itself (I suspect you knew this but just for clarity...):werd:
Oooh.......OUCH! Didnt think the manual made that much of a diff. Shoot I woulda had knee surgery if I knew that lol!
"Net" meant "with all the accessories" -- stuff like water pumps, alternators, fans, etc. that cause drag and that that weren't required under the older "gross" rules. Even so, however, there were no hard-&-fast proscriptions about the actual testing regimen, which meant fudging the numbers was the norm. A few years ago (someone will chime in with when), the SAE published very specific guidelines for measuring engine output and most manufacturers complied, providing the first "accurate" power numbers for new cars and also providing, for the first time, a meaningful comparison between different cars, whether from the same or different manufacturers.I thought modern factory numbers were net, so wouldn't that mean they measure it at the drive shaft or something like that? I thought it was gross ratings from '71 and before or somethin like that that were from the flywheel or crank or somethin?
It's because it is a Camaro and not a CorvetteIf I owned a speed shop I might be tempted to fudge the numbers so that they appear lower in stock form, then when the car is modded it would appear as if my mods made even more additional power than they normally would have.
There are many ways to alter chassis dyno #'s.
I'm not saying this is what happened with this particular car, but the numbers do seem a little low compared to stock LS3 Vette dyno numbers imo.
OK, here I go again with my dumb questions... why does the L99 get 26 less horsepower at the crank than the LS3? I thought they were essentially the same engine.^^^ It's not the transmission, it's then engine itself (I suspect you knew this but just for clarity...)
The manual comes with the 430 HP LS3 and the automatic comes with the 400 HP L99 (w/ variable valve timing and automatic fuel management.) I think you'll be very happy with it (and I suspect the only 400 HP L99s are gonna catch a lot of LS3s off-guard at the lights...)
Obviously not, there was a bit of humor in my reply They may be tuned slightly different from the factory etc. GM does not have a long history of having other vehicles produce more HP than the flagship CorvetteSoo...the Vette with 4 more flywheel hp makes 30+ more rwhp just because it's not a Camaro? Redline Motorsports has dynoed several 09 Vettes with over 400 rwhp stock.
The focus of the L99's VVT appears to be increased charge efficiency (that is, attempting to maximize extraction of potential energy from the fuel-air "charge", not the battery-related efficiency I just posted about in a different thread!) across the operating RPM range rather than (and, to an extent, at the expense of) the peak-power RPM range at which VE (volumetric efficiency) is naturally high. In essence, the are trading a little HP for a broader torque curve but get remarkably similar "areas under the curve" or total power delivery capability. This is a very intelligent approach, too, IMHO.OK, here I go again with my dumb questions... why does the L99 get 26 less horsepower at the crank than the LS3? I thought they were essentially the same engine.
Did someone say, "cam-swap"? opcorn:...
The L99 has a slightly lower mechanical RPM limit, I'd assume due to harmonic issues, but appears to be "cammed" to have run out of steam by then anyhow. It will be very interesting to see what the more technologically sophisticated aftermarket folks will do here (and I do NOT mean the troglodytes who will advocate ripping VVT out...)