Quote:
Originally Posted by DeathChill
So did we ever decide if the R/T manual and R/T automatic are rated the same? I'm pretty sure they are, aren't they?
Dyno's really don't prove anything because they're all different and who knows what the car had done to it. Anyone can say it's stock but it doesn't make it so.
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Manual has more power than the auto, just like the Camaro. I think it has to do with how much power/torque the tranny can handle, or perhaps how the exhaust is routed. I don't think it's much of a difference though.
However, on a dyno an automatic will show less HP than the manual due to higher drive train parasitic losses.
Crank HP doesn't mean a whole lot to me anyway. I wanna know what it puts to the ground as that's what you're actually gonna use. However for those interested in figuring crank HP from a dyno it's a pretty simple calculation:
For manual transmissions:
Add 12% to the dyno HP number
For automatic transmissions:
Add 15% to the dyno HP number
For example:
Say a manual tranny car dynos at 350 RWHP
350 x .12 = 42
350 + 42 = 392 (Crank)
This accounts for parasitic loss through the transmission and drive axle. Those are the numbers I personally use, but I've read it's anywhere from 12 - 20% difference depending on the car.
Once I get a few miles on mine I will dyno it bone stock just to get a base number before the mods start. I'll then likely dyno it after each modification to see what is gained. All of it will be detailed on my website at
www.hooliganbiketech.net for those that care.