Weight diet/ horsepower gains.
#1
03-08-2007, 01:09 AM
Join Date: Jul 2003
Location: Tampa Bay Area, Florida
Age: 57
Posts: 973
Rep Power: 60 
Weight diet/ horsepower gains.
Figured one of you horsepower junkies in here could answer this question.
What is the weight savings to horsepower gains calculation?
What is the weight savings to horsepower gains calculation?
#3
03-08-2007, 11:28 AM
Originally Posted by flatsixnut
Figured one of you horsepower junkies in here could answer this question.
What is the weight savings to horsepower gains calculation?
What is the weight savings to horsepower gains calculation?
#7
03-08-2007, 02:27 PM
Anyone know if my SSR's are lighter than the stock wheels? They came on the car when I bought it so I didn't see any original specs. If it matters they are the 18's.
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#8
03-08-2007, 03:22 PM
Originally Posted by flatsixnut
Figured one of you horsepower junkies in here could answer this question.
What is the weight savings to horsepower gains calculation?
What is the weight savings to horsepower gains calculation?
On a 3000 lb car with 100hp, you're at 30 lbs per hp. That means you need to save 30 lbs to equal 1 hp.
On a 3400 lb car with 415 hp, you're at 8.2 lbs per hp.
#9
03-08-2007, 03:32 PM
And note that the real effects of lightening is more palpable
than a horsepower figure. If you say you have a '415 hp' car,
the fact is that even at the drag strip, your car is developing
415 hp at about half a second of the run at best. 95% of the
time your car is at a different RPM, producing significantly
less power. Your car is, however, the same weight at all times,
so the real effect of weight loss is as if your torque curve was
raised across the board. Weight loss is *better* than a power
adder because power adders can add lag, or lower the torque
in some places to get more in others etc.
Lightening moving parts is doubly beneficial. The wheels should
be the first step.
Joe
PS: Just for interest, mathematically, if a 3000 lb. car can put
down a constant 200hp to the ground for an entire quarter-mile
run, it's a 9-second car.
than a horsepower figure. If you say you have a '415 hp' car,
the fact is that even at the drag strip, your car is developing
415 hp at about half a second of the run at best. 95% of the
time your car is at a different RPM, producing significantly
less power. Your car is, however, the same weight at all times,
so the real effect of weight loss is as if your torque curve was
raised across the board. Weight loss is *better* than a power
adder because power adders can add lag, or lower the torque
in some places to get more in others etc.
Lightening moving parts is doubly beneficial. The wheels should
be the first step.
Joe
PS: Just for interest, mathematically, if a 3000 lb. car can put
down a constant 200hp to the ground for an entire quarter-mile
run, it's a 9-second car.
#10
03-08-2007, 10:45 PM
Originally Posted by Kevinw23
What are some of the easy ways to reduce weight to a stock vehicle? Are there any?
go through the weight loss thread and pick what you like. there is an "easy" 150 pounds to shed.
#11
03-09-2007, 06:49 AM
Originally Posted by tom kerr
Kevin,
go through the weight loss thread and pick what you like. there is an "easy" 150 pounds to shed.
go through the weight loss thread and pick what you like. there is an "easy" 150 pounds to shed.
Just an idea...only in the name of health and speed
#12
03-09-2007, 10:21 AM
Originally Posted by silvershark
We could all probably reduce our body fat % and = 5lb-15lb or more.
Just an idea...only in the name of health and speed
Just an idea...only in the name of health and speed
I would rather (as an MD of course) see someone loose 10 pounds of unneeded weight rather than buy a lighter battery!!
I weight 160 compared to racing someone who weights 220, think about it me and my car are 60 pounds lighter!!!!
#13
03-09-2007, 08:15 PM
Join Date: Jul 2003
Location: Tampa Bay Area, Florida
Age: 57
Posts: 973
Rep Power: 60
Originally Posted by SallyMobile
It depends on what HP and weight you're running stock.
On a 3000 lb car with 100hp, you're at 30 lbs per hp. That means you need to save 30 lbs to equal 1 hp.
On a 3400 lb car with 415 hp, you're at 8.2 lbs per hp.
On a 3000 lb car with 100hp, you're at 30 lbs per hp. That means you need to save 30 lbs to equal 1 hp.
On a 3400 lb car with 415 hp, you're at 8.2 lbs per hp.
So if I lost another 200 pounds, It would feel like I gained another 30 hp?
Last edited by flatsixnut; 03-09-2007 at 08:21 PM.
#14
03-09-2007, 08:23 PM
At that point, it's a rough 10.9 lbs per hp. Drop 200 lbs and it's like increasing 18 hp. It'll always be off a bit, especially as you make bigger weight or hp changes.
Again, as Joe Weinstein pointed out, these are only approximate numbers. There's more to the story.
Again, as Joe Weinstein pointed out, these are only approximate numbers. There's more to the story.
#15
03-09-2007, 08:24 PM
Originally Posted by tom kerr
That actually is very real and a great idea for all it may apply to.
I would rather (as an MD of course) see someone loose 10 pounds of unneeded weight rather than buy a lighter battery!!
I weight 160 compared to racing someone who weights 220, think about it me and my car are 60 pounds lighter!!!!
I would rather (as an MD of course) see someone loose 10 pounds of unneeded weight rather than buy a lighter battery!!
I weight 160 compared to racing someone who weights 220, think about it me and my car are 60 pounds lighter!!!!
Lay off those burgers!!
Last edited by topgun; 03-09-2007 at 09:20 PM.