I dynoed my car stock yesterday.
Dynojet Dyno.
Got 308RWHP and 240RWTQ.
Weighed on 4 corner scales at 3570lb with 3/4 tank of fuel.
Video at http://www.youtube.com/watch?v=FlxpkTDrZKw
I will try to post graph and HD version of video if there is any interest.
Car did have very flat torque curve and ran very rich(<10:1) in the upper RPM range.

 

Wow! Thanks for posting the vid.

 

wow...sounds sick! 240tq seems a little low. what does AM claim at the flywheel?

 

 

sounds phenomenal

 

The torque is proportional to the hp 380/302 crank vs. 305/240 wheel is just about a perfect 20% drivetrain loss.

 

do you have a a pic/scan of the graph? I'd be very interested to see it

and yeah, 10:1...............yikes

 

sounds awesome

 

It looks and sounds great on the dyno!

 

post ***** much?

 

WTF is that supposed to mean?

 

20% that sound alot, especialy for a new car... I use 12% for my 13 year old supra, new cars should be under 10% drivetrain loss shouldn't it?

 

never seen 10% for any car - around 20% is more in line and actual - 12% is a very interesting figure - is this a factual measurement, or a calculation/estimate ?

 

Just to shed some light on this topic, drivetrain loss is usually expressed in % for simplicity sake. Truth be told, the loss of power from the crankshaft to the wheels requires x amount of torque. This number is difficult to quantify so its expressed in %.

Think of it this way, if I tried to transfer power through the transmission and to the wheels by turning something with only the strength of my arms, would 70% or 80% or 90% of the power be transfered to the ground? No, it wouldn't go anywhere because there isn't enough power to overcome the initial amount of torque necessary to move the wheel in the first place.

Now in addition to this number (x), factors such as friction and intertia come into play to take away some more power. Further complicating things is that manufacturers routinely underestimate/overestimate power so who knows how much the actual loss is - I mean does anyone really believe that the Nissan GT-R or even the Neon SRT-4 have 0% drivetrain loss or that the RX-8 (using its initial 238hp rating) was losing 25% in some cases? So yeah, its a lot simpler to just say a magic percentage.

What cracks me up is when aftermarket tuners say "This supercharger makes 100 hp at the wheels so after 15% loss, it must really make 117 hp at the crank." No actually, you probably added a little over 100 hp to the crank as efficiency marginally decreases as you increase the amount of power being transfered.

None of this really matters of course since the amount that gets to the ground is the important thing.

Your car sounds great by the way!

 

Sounds good!