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Old 09-11-2010, 12:25 PM   #1
nuclearay
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Question HP vs. weight vs. mph

To ls1gto.com's brightest and best:

I gather that losing 100# is equivalent to 10hp; and either is equivalent to losing a tenth in the quarter mile...

But what can losing a 100# (or gaining 10hp) equate in a mph gain?
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Old 09-11-2010, 01:54 PM   #2
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Quote:
Originally Posted by nuclearay...View Post
To ls1gto.com's brightest and best:

I gather that losing 100# is equivalent to 10hp; which either is equivalent to losing a tenth in the quarter mile...

But what can losing a 100# (or gaining 10hp) equate in mph?

About 1 MPH
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Old 09-11-2010, 02:28 PM   #3
mk9190
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100lbs=10hp=.10=1mph.......but only up to a point.So far I haven't found that point yet...I'm to slow
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Old 09-13-2010, 08:14 AM   #4
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Made these a long time ago, thus the model I used was a bit rough. But this should give you a general idea as far as power is concerned.

For a 6-speed with stock gears:



You can see its definitely not linear. The hp required for a mph increase, increases as you add more power.
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Old 09-13-2010, 09:46 AM   #5
nuclearay
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I'm just a little suprised at some recent drag results of mine

Earlier this year:
1.93 60' 8.06@88.66 12.45@111.05 = avg of three runs all VERY close in time/et

Last week:
1.82 60' 7.93@90.37 12.22@114.24

DA was the same @ 1900.
The drop in ET I contribute to the better 60' (different clutch, but the old one wasn't slipping).
The only difference was a 100# weight loss (passenger and rear seat removal).

There *IS* one other possibility...
My tuner and I traded vehicles for a week while he put a final "street/drivability tune"...
This could account for some 'hidden' power ...and wouldn't necessarily be a bad thing.
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Old 09-13-2010, 05:08 PM   #6
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The mph could also come from a cooler engine cooler air temps diffent tire pressure there is alot there to mess with to gain mph.
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Old 09-13-2010, 06:09 PM   #7
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Quote:
Originally Posted by nuclearay...View Post
To ls1gto.com's brightest and best:

I gather that losing 100# is equivalent to 10hp; and either is equivalent to losing a tenth in the quarter mile...

But what can losing a 100# (or gaining 10hp) equate in a mph gain?

Ray, this is a question that may inspire debateEvery change in weight and or horsepower will result in a faster car in every aspect, ET and MPH. NOW, here is where it gets interesting, adding any amount of HP will always produce a larger gain in a lighter car. Huh, yup thats right, for example a 150 hp increase will net a larger et and mph gain at 3500lbs than 4000lbs and another larger gain for the 3000lb car than the 3500lb car with the same 150hp. You also must factor in wind resistance increasing relative to speed. So tell me why I need all these interior bits and pieces??
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