wheel hp into crank hp ??

[Billman]

maybe this is interesting for some

http://www.rri.se/index.php?DN=29

[EspenW]

Here is a list of calculators that might be interesting:

http://www.wallaceracing.com/Calculators.htm

Calculating peak hp from quartermile data, and especially trap speed can be pretty accurate. However, dual clutch gearboxes like the one in the R35 GTR throw them off. That is why the GTR was rumored to be severely underrated when it came out. What folks forgot about was the fact that these boxes let the engine stay on power/boost constantly. Not being interrupted by 3-4 time and boost wasting gear changes made a big difference.

If you have speed or rpm vs. time logs from either the standalone, GPS or accelerometers, I can run the data through the Virtual Dyno and get some curves for comparison with your dyno curves. Need FD and gear ratios used, along with tire size and vehicle weight. (Must be from runs with traction, as wheel spin will send the numbers skywards )

[EspenW]

maybe this is interesting for some

http://www.rri.se/index.php?DN=29

Rototest got a nice database, only too bad that it is rarely updated. they got some very good technical papers listed as well.
Note that these data are from a hub dyno, which will see much lower losses than a rolling road. The losses from a hub dyno can be expressed rather accurately as a percentage, unlike rolling roads where it is a combination of static loss and percentage of input power.

[quattro84]

Hubdyno's are great, they take out the biggest variables out the total equation. Too bad the Rototest ones are noisy as h3ll and aren't capable of powering the vehicle to determine actual drivetrain & engine losses.

And as mentioned before in this discussion, i agree that a dyno is a perfect tool to measure actual gains (or losses) in performance but not accurate enough to compare between events or sites, let alone discuss about differences percentage-wise.

[speeding-g60]

wow i get all different types of results using just one timeslip for each calc.....

here is the timeslip i used, thats what i ran. so which is correct? and noe of these have AWD as a factor? i could see these calcs having some merit if they were relatively close... but they arent. only one came up what i run for ET vs Speed, and that said 580.5 hp. i input weight (2850) and speed (141), it calculated my exact ET of 9.90.

so which one is right? which one closest??

Your HP is 577 from your ET
Your HP is 656 from your MPH
Your Grains of water is 72
Your HP Correction Factor is 1.03
Your DA (Density Altitude) is 1,418 feet
Your Air Density Index is 95.9 percent

Your HP computed from your vehicle ET is 537.05 flywheel HP and 483.35 rear wheel HP.
Your HP computed from your vehicle MPH is 667.63 flywheel HP and 600.86 rear wheel HP

Your 60 Foot MPH is 45.00 MPH ( 1.496 60')

Your HP computed from your vehicle ET is 522.48 rear wheel HP and 580.53 flywheel HP.
Your HP computed from your vehicle MPH is 549.21 rear wheel HP and 610.24 flywheel HP.

Your HP is 597 from your ET
Your HP is 643 from your MPH
Your HP Correction Factor is 1.03
Your Grains of water is 72
Your DA (Density Altitude) is 1,418 feet
Your Altitude Density Index is 95.9 percent

Your HP computed from your 60 Foot Time of 1.496 at Weight of 2850 pounds is 412.14 HP.

for my 60'
60 Foot 1.496
330 Foot 4.32
660 Foot 6.79
660 MPH 100.09
1000 Foot 8.93
1/4 Mile ET 10.76
1/4 Mile MPH 123.11

for my 330'

60 Foot 1.46
330 Foot 4.23
660 Foot 6.65
660 MPH 102.25
1000 Foot 8.74
1/4 Mile ET 10.54
1/4 Mile MPH 125.77

for my 1/8th mile ET
60 Foot 1.42
330 Foot 4.11
660 Foot 6.452
660 MPH 105.35
1000 Foot 8.49
1/4 Mile ET 10.23
1/4 Mile MPH 129.58

for my 1/8th mile speed
60 Foot 1.33
330 Foot 3.83
660 Foot 6.03
660 MPH 112.81
1000 Foot 7.93
1/4 Mile ET 9.55
1/4 Mile MPH 138.76

for my 1000'

60 Foot 1.39
330 Foot 4.02
660 Foot 6.32
660 MPH 107.54
1000 Foot 8.314
1/4 Mile ET 10.02
1/4 Mile MPH 132.28

for my 1/4 mile et

60 Foot 1.38
330 Foot 3.98
660 Foot 6.25
660 MPH 108.73
1000 Foot 8.22
1/4 Mile ET 9.907
1/4 Mile MPH 133.74

for my 1/4 mile trap
60 Foot 1.30
330 Foot 3.76
660 Foot 5.91
660 MPH 114.99
1000 Foot 7.78
1/4 Mile ET 9.37
1/4 Mile MPH 141.44