LOL, I know this so has to be off, and it doesnt surprise me as its not a true dyno, but hell it was interesting to see. This was 2nd gear then shift and then to the end of 3rd. 16.3 PSI

http://www.xenozx.com/movies/163psi300hp.MPG'
(right click and save target as)

 

If thats your car in the video, with your current mods on your list thats about right for crank hp. Those dyno read crank hp not whp.

 

I dynoed at the wheels 250 with just an exaust. Added much since then I dont know, but -20% drive train loss that would put me at 240, which is less then I was before stage 2 and Intake, plugs, etc.

 

With a fwd car its more like a 15% loss in hp. 15% of 300 is 45, 300hp - 45hp loss = 255whp. Giving that your divice is not 100% accurate, its pritty close.

 

15%!!!!!!!!!!!!!! loss!!!!!!

thats crazy! i had nooooooooo clue that some how our simple and small drive train had that much loss in it


i know some of my f-body buddys had a 10-12%loss and thats was high from what i've always been told.

 

I read in a car magazine (cant remember witch one) they said its about on average a fwd car losses about 12-15% loss, rwd 17-20% loss. I can't imagine the loss of an awd car.lol

 

holy crap!!!!!!!!!!

thats HUGE!.....

 

i dynoed 260 whp with stage 2 and aem cai and now i added a zzp 2.8" pulley on and man u can tell the diff, im hittin about 18lbs of boost now probably 270whp now but wont know until i dyno it again.

 

I hear ya. I have high flow cat/down pipe that I will have installed tomorrow.

I am waiting for pulley boys to release their 2.8 that will fit the GM stage 2 hub. Once that drops IM sure I will be 275-285ish at the wheels

At that point im pretty sure the stock clutch would die lol.

 

The cobalt has a 17% drivetrain loss per GM

 

hey how come the shift lights never lit up?

 

If your referring to RWD the reason is torque is lost through lonf drive shafts. we eliminate one with a FWD therefore less loss.

 

he probably didnt have it programed to come on at a certain rpm yet

 

Given that the power appears to be underrated by an average of 20% or so, can we assume the same about drivetrain loss?

17-3.4 = 13.6 % drivetrain loss...hrm...

 

So basically, we have to program the upshift lights, built-in from the factory, so they can serve their purpose? I thought the owner's manual said it would come on at a particular rpm but I haven't seen the thing light up once.

 

The cobalt ss/sc doesn't come with a shift light, the ls/lt do, i'm not sure about the ss na?

 

The gauge does have a shift light. You input the RPM and thats when it turns on. I havent set it yet so its off right now.

 

with this much power that everyone is claming to have and no one is near as fast of fast06ss then there are some serious issues going on here

 

Its the clutch man its the clutch. I know that the only way I will put down VERY good #'s is if I get something better then this piece of crap clutch that GM gave us. I have every intention of getting a CM stage 3, but i will wait until my stock clutch is gone, and also when I have 1300 that I can drop on the parts/install without hurting me for a bit. As soon as I get my header and 2.8 inch pulley IM done until the clutch drops.

 

AWD cars lose alot! not sure what percent though. stock sti's dyno at about 230whp and stock evo's dyno at about 240ish.

 

17-20% for rwd is off! motor trend did a wheel dyno on a mustang gt (300 hp) and it made 276 whp do the math and that about a 9% loss (que tom with mathmatical correction. Ok its a 8.69565217% loss) 9% loss is outstanding for a rwd car! Older rwd vehicles suffer hugly with losses up to 30%!!!

 

RWD takes a bigger hit then a FWD car. Its called a driveshaft, and the fact that the engine sits many feet away from the engine itself.

A FWD cars engine sits on top of the drive wheels so it takes less of a loss.

THat mustang may be a factory freak, but that certainly isnt the case with all RWD cars, even new ones.

 

It is possible that the motor had more power than 300 crank. Similar to a certain FWD SC I know of. lol

 

yeah now that I think about it, it prolly was a factory freak. The part about 30% with older vehicles loosing 30% was no lie. I was at this dyno/hotrod shop. They had a motor in there that dynoed at 457 hp at the crank. They dropped it in a dodge challenger, and took it to the wheel dyno where it made a whopping 351 whp! Thats about a 30% loss!

 

Uhhhhh.... NO!