Quarter Mile calculation
New User
Joined: Aug 2001
Posts: 14
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Quarter Mile calculation
Ok,approximately how much power is lost before it makes it to the rear wheels. I thought it was around 30-40%, can anyone be a bit more precise. I would like to run mid tens and I need about 550 rear wheel according to the program. Providing my '55 F100 project weighs the 3300 I thought it did (which might also be a bit out). Can someone put me straight.
Cargo Master
Joined: Jul 2000
Posts: 2,281
Likes: 18
From: Northern California
Quarter Mile calculation
I personally don't think you can look at it like that but I may be wrong.
I've heard that the C6 is a hog, using about 60~75HP and that a stick will use much less.
The problem I have is that I don't understand why a stick would use say 40HP with a 300HP engine and then 50HP with a 400HP engine. I'm no pro here, but it seems that it would be more constant reguardless of the HP from the engine. If taken to the extream, the C6 in a 215HP 360 and a 500HP 428CJ would be hugely different, but yet the same tranny.
this might be a small point here, but these calcs don't take into account the design of the truck, with the big flat front grill vs say a vette 'knife edge' front end that should make a difference. But they still make a good quick reference.
I've heard that the C6 is a hog, using about 60~75HP and that a stick will use much less.
The problem I have is that I don't understand why a stick would use say 40HP with a 300HP engine and then 50HP with a 400HP engine. I'm no pro here, but it seems that it would be more constant reguardless of the HP from the engine. If taken to the extream, the C6 in a 215HP 360 and a 500HP 428CJ would be hugely different, but yet the same tranny.
this might be a small point here, but these calcs don't take into account the design of the truck, with the big flat front grill vs say a vette 'knife edge' front end that should make a difference. But they still make a good quick reference.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Quarter Mile calculation
Ok,approximately how much power is lost before it makes it to the rear wheels. I thought it was around 30-40%, can anyone be a bit more precise. I would like to run mid tens and I need about 550 rear wheel according to the program. Providing my '55 F100 project weighs the 3300 I thought it did (which might also be a bit out). Can someone put me straight.
I don't know where that rear Wheel HP comes from, but the numbers that I get are close to what Drag 2000 gives me for Peak Engine HP. I think that the mid tens would require about 550 HP from a 3300 lb machine. This calculator also ignores the Aerodynamics and gearing as does the equation that started this whole thing.
It also assumes that everything else is set up properly, like traction, shifting etc.
An automatic tranny loses HP due to slippage. The higher an engine revs, the more the torque converter slips. A high stall torque converter, as used in racing slips even more. So the more power an engine can make, the more the tranny loses. A stick coupled to a high HP engine will require a better clutch etc. This may be converted to HP loss.
The bottom line is that these tools can give you some idea of the performance capability of a engine vehicle combination, but the real proof is when you get on the track and put the petal to the metal.
New User
Joined: Aug 2001
Posts: 14
Likes: 0
Quarter Mile calculation
Thanks for that. I had picked up on another thread that a '51 F1 weighted in at 3300lbs which I thought was a bit light but your 4000lbs is probably closer to the mark. Anyone else know an accurate weight for their 50's F100?
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