Official Turbo Weight Loss Thread/ Lightest Turbo List
#108
02-19-2007, 06:59 PM
Join Date: Jul 2006
Location: ga
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Originally Posted by sechsgang
Wow...I would have never thought to do that!
#110
02-19-2007, 07:59 PM
Ive been wondering how weight loss translates in terms of hp so I did some rough calculations that might be interesting to you all. If you assume a 3500 lb car with 500 hp, each 100 lbs of weight loss translates to this amount of power. Math experts please correct me if im wrong.
Weight....actual HP.........lbs/hp.............relative power
3500.......500.................7.0................ .500
3400.......500.................6.8................ .514.7
3300.......500.................6.6................ .530.3
3200.......500.................6.4................ .546.9
3100.......500.................6.2................ .564.5
3000.......500.................6.0................ .583.3
So a 300lb weight loss is the equivalent of adding 47 hp if my calculations are correct. Interesting to note that going from 3500 to 3400 is only equivalent to 14.7 hp and going from 3100 to 3000 is equivalent to gaining 18.8 hp. It would be interesting to make tables like this for cars with 600hp and 700 hp and so on.
Weight....actual HP.........lbs/hp.............relative power
3500.......500.................7.0................ .500
3400.......500.................6.8................ .514.7
3300.......500.................6.6................ .530.3
3200.......500.................6.4................ .546.9
3100.......500.................6.2................ .564.5
3000.......500.................6.0................ .583.3
So a 300lb weight loss is the equivalent of adding 47 hp if my calculations are correct. Interesting to note that going from 3500 to 3400 is only equivalent to 14.7 hp and going from 3100 to 3000 is equivalent to gaining 18.8 hp. It would be interesting to make tables like this for cars with 600hp and 700 hp and so on.
Last edited by rwm514; 02-19-2007 at 08:03 PM.
#111
02-19-2007, 08:08 PM
Guest
Posts: n/a
Originally Posted by rwm514
Ive been wondering how weight loss translates in terms of hp so I did some rough calculations that might be interesting to you all. If you assume a 3500 lb car with 500 hp, each 100 lbs of weight loss translates to this amount of power. Math experts please correct me if im wrong.
Weight....actual HP.........lbs/hp.............relative power
3500.......500.................7.0................ .500
3400.......500.................6.8................ .514.7
3300.......500.................6.6................ .530.3
3200.......500.................6.4................ .546.9
3100.......500.................6.2................ .564.5
3000.......500.................6.0................ .583.3
So a 300lb weight loss is the equivalent of adding 47 hp if my calculations are correct. Interesting to note that going from 3500 to 3400 is only equivalent to 14.7 hp and going from 3100 to 3000 is equivalent to gaining 18.8 hp. It would be interesting to make tables like this for cars with 600hp and 700 hp and so on.
Weight....actual HP.........lbs/hp.............relative power
3500.......500.................7.0................ .500
3400.......500.................6.8................ .514.7
3300.......500.................6.6................ .530.3
3200.......500.................6.4................ .546.9
3100.......500.................6.2................ .564.5
3000.......500.................6.0................ .583.3
So a 300lb weight loss is the equivalent of adding 47 hp if my calculations are correct. Interesting to note that going from 3500 to 3400 is only equivalent to 14.7 hp and going from 3100 to 3000 is equivalent to gaining 18.8 hp. It would be interesting to make tables like this for cars with 600hp and 700 hp and so on.
+33reps for posting
#112
02-19-2007, 08:16 PM
Originally Posted by VRAlexander
Thanks for taking the time to post this....Now I am curious to see the hp gain if I where to take my 1000+hp Protomotive 996tt from 3879lb down to 2600lb's ???
+33reps for posting
+33reps for posting
3879lbs with 1000 hp = 3.88 lbs/hp
2600lbs with 1000 hp = 2.6 lbs/hp
would feel like a 3879lb car with 1492 hp
Are you really thinking of doing it?
#115
02-19-2007, 09:59 PM
Join Date: Jul 2006
Location: ga
Posts: 8,934
Rep Power: 550
Nice, I think I'm going to add this to the 1rst post, very relevant to the purpose of this thread. Thanks bro.
#116
02-20-2007, 12:16 PM
In our new tables of "horsepower equivalency" I wonder what part aerodynamics plays in high-speed performance? The frontal area, of course remains the same, but would the down force at high speed change with a lot of weight removal assuming the spring rates are not changed and also would the DF change depending upon where the weight removal occurred.
All you engineers and aerodynamicists out there--help.
All you engineers and aerodynamicists out there--help.
#117
02-21-2007, 05:21 PM
Originally Posted by rwm514
Ive been wondering how weight loss translates in terms of hp so I did some rough calculations that might be interesting to you all. If you assume a 3500 lb car with 500 hp, each 100 lbs of weight loss translates to this amount of power. Math experts please correct me if im wrong.
Weight....actual HP.........lbs/hp.............relative power
3500.......500.................7.0................ .500
3400.......500.................6.8................ .514.7
3300.......500.................6.6................ .530.3
3200.......500.................6.4................ .546.9
3100.......500.................6.2................ .564.5
3000.......500.................6.0................ .583.3
So a 300lb weight loss is the equivalent of adding 47 hp if my calculations are correct. Interesting to note that going from 3500 to 3400 is only equivalent to 14.7 hp and going from 3100 to 3000 is equivalent to gaining 18.8 hp. It would be interesting to make tables like this for cars with 600hp and 700 hp and so on.
Weight....actual HP.........lbs/hp.............relative power
3500.......500.................7.0................ .500
3400.......500.................6.8................ .514.7
3300.......500.................6.6................ .530.3
3200.......500.................6.4................ .546.9
3100.......500.................6.2................ .564.5
3000.......500.................6.0................ .583.3
So a 300lb weight loss is the equivalent of adding 47 hp if my calculations are correct. Interesting to note that going from 3500 to 3400 is only equivalent to 14.7 hp and going from 3100 to 3000 is equivalent to gaining 18.8 hp. It would be interesting to make tables like this for cars with 600hp and 700 hp and so on.
#118
02-21-2007, 07:25 PM
Originally Posted by KPG
Most us drag racers here will agree that at those power levels and weights every 100lb reduction will net at least a .1 sec reduction in ET, maybe more. Does anyone have any hard data that would verify that a .1 or so reduction can be had for 14hp? Thanks,Kevin
This may be a pretty good number. I can't attest to it as most of my drag vehicles were considrably faster than the 10-second range. At speeds upwards of 200 in the quarter, the hundred pounds might have made a half tenth difference at the most, but at slower trap speeds, you probably have a valid statement.
I can remember adding over 200 lbs. one day to try to set a B/A national record, coming down from A/A, and the addition of the weight barely slowed us down at all. Of course another factor is where do you add or subtract the weight.
Some of my friends run Pro-Mod classes now and they tell me that a hundred either way is barely noticeable. As speed escalates, the number becomes less significant.
In the really go-quick world, cars can never have too much bite, only too little horsepower.
#119
02-21-2007, 09:26 PM
Originally Posted by Al Norton
Kevin,
This may be a pretty good number. I can't attest to it as most of my drag vehicles were considrably faster than the 10-second range. At speeds upwards of 200 in the quarter, the hundred pounds might have made a half tenth difference at the most, but at slower trap speeds, you probably have a valid statement.
I can remember adding over 200 lbs. one day to try to set a B/A national record, coming down from A/A, and the addition of the weight barely slowed us down at all. Of course another factor is where do you add or subtract the weight.
Some of my friends run Pro-Mod classes now and they tell me that a hundred either way is barely noticeable. As speed escalates, the number becomes less significant.
In the really go-quick world, cars can never have too much bite, only too little horsepower.
This may be a pretty good number. I can't attest to it as most of my drag vehicles were considrably faster than the 10-second range. At speeds upwards of 200 in the quarter, the hundred pounds might have made a half tenth difference at the most, but at slower trap speeds, you probably have a valid statement.
I can remember adding over 200 lbs. one day to try to set a B/A national record, coming down from A/A, and the addition of the weight barely slowed us down at all. Of course another factor is where do you add or subtract the weight.
Some of my friends run Pro-Mod classes now and they tell me that a hundred either way is barely noticeable. As speed escalates, the number becomes less significant.
In the really go-quick world, cars can never have too much bite, only too little horsepower.
. Unfortunately, I have gone to the track and produced great traps, ET and 60 ft times....never all at once on the on the same timeslip though...lol. Keeps me going back....Kevin
#120
02-21-2007, 10:00 PM
Kevin,
I guess I'll get my chance in a month or so to see how hard these babies really are for getting any consistency at the strip. I'm used to a 3-speed Lenco and a two-stage rpm limiter for very consistent launches. Well, I was used to it in 1984. :-) Never tried to launch ANY Porsche, much less a tt at the drag strip. Going to go once anyway, just to get some numbers.
From all I read, I'll really have my work cut out for me with a tt. Do you back into the water box and really get a good smoking burn-out in second gear before you go to the line? I would suspect that any tire you choose needs some good heat-build before going to the line.
I guess I'll get my chance in a month or so to see how hard these babies really are for getting any consistency at the strip. I'm used to a 3-speed Lenco and a two-stage rpm limiter for very consistent launches. Well, I was used to it in 1984. :-) Never tried to launch ANY Porsche, much less a tt at the drag strip. Going to go once anyway, just to get some numbers.
From all I read, I'll really have my work cut out for me with a tt. Do you back into the water box and really get a good smoking burn-out in second gear before you go to the line? I would suspect that any tire you choose needs some good heat-build before going to the line.