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Old 03-05-2013, 09:35 PM   #1
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Calculations

Found this in an advanced supercharger mechanics book, thought you guys might find it useful. It was pretty accurate for me.

The 5.825 is a constant used for both. The 2700 number in the first one is curb weight. Just wanted to clarify, it may have been a little cut off.
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Old 03-05-2013, 09:37 PM   #2
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I think this hp was measured as hp @ the flywheel.
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Old 03-07-2013, 11:24 PM   #3
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Sorry could you explain these calculations a little more?
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Old 03-07-2013, 11:50 PM   #4
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Very cool.
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Old 03-08-2013, 07:07 AM   #5
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Sorry could you explain these calculations a little more?
For the first one, if you know your curb weight and your quarter mile time, you use that formula to find your approx. hp.
The 2nd one is the inverse, if you know your curb weight and hp, you can find your approx. quarter mile time. These will vary a little because of factors like gears and better tires. But it's still pretty cool if you ask me.
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Old 03-08-2013, 01:06 PM   #6
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Huge variables at play with these kind of charts. On most cars built for pure 1/4 mile performance the tires/gears/suspension setup are worth well over 2 full seconds in ET when combined together and thats aside from power and weight. There are even more variables as well due to power band differences across the rpm range as well as the large variable of torque. However as some will realize that their numbers may be compairable as you continue to modify your vehicles you will notice more and more how these kinds of charts not compairable to your numbers.
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Old 03-08-2013, 01:19 PM   #7
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Huge variables at play with these kind of charts. On most cars built for pure 1/4 mile performance the tires/gears/suspension setup are worth well over 2 full seconds in ET when combined together and thats aside from power and weight. There are even more variables as well due to power band differences across the rpm range as well as the large variable of torque. However as some will realize that their numbers may be compairable as you continue to modify your vehicles you will notice more and more how these kinds of charts not compairable to your numbers.
This is better for slightly modded or stock cars, I agree suspension and tires and gears play a huge role. Still pretty cool to me that you can estimate things like that. You can always take off a little time to account for suspension and the like.
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Old 03-08-2013, 01:45 PM   #8
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True you can try to account for it but to my knowledge there is no true formula yet for this type of calculation. The more heavily modified your car is the less accurate this type of a formula will be.

Cars can break the simple laws of physics as I pointed out to my science teacher when I was in highschool. My teacher said if you have 2 cars that are exaclty alike in every way except one is lighter then the lighter car will be faster because it takes less effort to move it. I protested. True most of the time sure, however you have another variable of traction asisted by gravity. It is possible to reach the point where with the power levels you have and limitation to your suspension type and tire size your car may be faster with more weight to add traction. Furthermore if you think about it there is no such thing as exactly the same car they can be the same but never will they be exact. The list of variable you can have that can hurt and help performance are so great and so complicated in mathematical terms that the calculators are completely obsolete and in my mind and are nothing more than a guess.
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Old 03-08-2013, 01:57 PM   #9
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True you can try to account for it but to my knowledge there is no true formula yet for this type of calculation. The more heavily modified your car is the less accurate this type of a formula will be.

Cars can break the simple laws of physics as I pointed out to my science teacher when I was in highschool. My teacher said if you have 2 cars that are exaclty alike in every way except one is lighter then the lighter car will be faster because it takes less effort to move it. I protested. True most of the time sure, however you have another variable of traction asisted by gravity. It is possible to reach the point where with the power levels you have and limitation to your suspension type and tire size your car may be faster with more weight to add traction. Furthermore if you think about it there is no such thing as exactly the same car they can be the same but never will they be exact. The list of variable you can have that can hurt and help performance are so great and so complicated in mathematical terms that the calculators are completely obsolete and in my mind and are nothing more than a guess.
This is very true. But I still like having the ball park figure lol
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Old 03-08-2013, 02:11 PM   #10
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according to that I need 550hp (3780lbs) to run 11.1 in the quarter, and I am about 575~ but... honestly I wouldnt run that without great traction (they dont really have anything in there for traction etc)
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Old 03-08-2013, 06:18 PM   #11
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Spector, I just realized you live not too far from me lol
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