440 estimate hp and torque

[Musicman]

Thanks for posting the sheet Ron 
I just wish it had the other data like Air Temp, Dew Point etc,  at time of test... These factors have a big impact on the final numbers.
My puter program actually spit out 439 HP & 515 TQ for this build using typical Dyno conditions, but my torque curve was off a bit; so it was probably more coincidence than science that my numbers turned out so close.

[komninon]

thank you Ron,
actually i am happy with the results .                                                                                                                                                       going from auto to manual tko 600 , 323 gears to 373 gears, better hp and tq, and 40-50 lb less weight, it will run a lot stronger than before.
i own my car 13 years and never took it to the track but i hope it will happen this year.

[komninon]

chassis dyno results:
342 hp    and   404 tq
did it last night with a 670 avenger
what do you think?

[oldschool]

chassis dyno results:
342 hp    and   404 tq
did it last night with a 670 avenger
what do you think?

thats about 23%driveline loss.i always thought theese older cars had more driveline loss than newer cars.i will be chassis dynoing my four speed dana car soon too....

[c00nhunterjoe]

it should be alot of fun with that 5 speed

[elacruze]

[/quote]
thats about 23%driveline loss.i always thought theese older cars had more driveline loss than newer cars.i will be chassis dynoing my four speed dana car soon too....
[/quote]

As a rule of thumb, we always figured about 20% loss between engine and chassis dynomometer readings-on Harley-Davidsons! Jap motorcycles maybe 15%.

Chassis dyno loses a lot just through the tires. I saw a guy pick up 8 hp (on 100) just by changing his street tire to a Bonneville tire. You can affect your chassis dyno numbers by inflating your tires to their max recommended. Problem is above about 600hp. the traction isn't there and you spin up.
Anybody with a ton of chassis dyno experience got input on that?

[c00nhunterjoe]

if thats true would running a skinny tire for the dyno pulls help numbers as well?

[70sixpkrt]

I had my motor dynoed on a stand 4 yrs. ago and it made 491hp and 535 torque. I put it on a chassis dyno 3 months ago and my numbers were 398.8hp and 447.8 torque. That is about 20% loss thru the drivetrain. My car is a 4 speed though.

[elacruze]

if thats true would running a skinny tire for the dyno pulls help numbers as well?

Tough answer. It's a balancing act between rolling resistance, traction, and horsepower. A wide tire will have more traction, but more rolling resistance. A radial tire has much less rolling resistance than a bias-ply tire. The more power you have, the harder you have to pull the car onto the roller-increasing the RR. I'd like to see someone do a direct comparison between say a set of BGF T/A's and a set of drag radials both at maybe 30psi and 50psi, on a car with enough horsepower to spin them both-then you'd see the effects of rolling resistance and tread compound. I can only say that on motorcycles, it always pays to make them as hard as possible until you get in the 250+hp range. I'm interested to see who has any solid car data with this stuff in mind. In reality, I don't expect tire and pressure changes making 8% difference on a car, maybe 1-2%. Maybe less.