shaving weight
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shaving weight

  1. #1
    Nelson MFG Nelson's Avatar
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    Default shaving weight

    Seems like it's pretty widely accepted 100lbs = .1 who's tested this? What have you seen on back 2 back runs?

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    Ralls Precision Machine Ballztech's Avatar
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    At ming in Oct. 2013 we where screwing around after finishing the day. I was running 9.0's on the motor at the time and wanted to try a little nosty. We had a nice little 28-jet tune up in it so I figured what the hell lets do a safety pass and see how she liked the bottle.

    I ran it, the thing loved the bottle and ran a 8.10. I was stoked.

    We had pecker neck Tony Hammons with us helping out.( thanks Tony!) ( you prick) Hot shot Tony wanted to make a pass and he did. Same tune up, same air, same everything, and he ran a 8.00. I'm 250 hes was a little fat at the time and weighed 180.

    So 70 pounds in my rig was .1 quicker.

  4. #3
    Nelson MFG Nelson's Avatar
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    That's good info, sounds like I need to jump on the treadmill.

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    Senior Member bc18's Avatar
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    Quote Originally Posted by Nelson View Post
    That's good info, sounds like I need to jump on the treadmill.
    The gut adds down force though.

  7. #5
    LP-25.com Infomaniac's Avatar
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    The guys that add weight to slow down can probably give good input. BP has experience adding weight and drag maybe he will chime in.
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


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  8. #6
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    Quote Originally Posted by Ballztech View Post
    At ming in Oct. 2013 we where screwing around after finishing the day. I was running 9.0's on the motor at the time and wanted to try a little nosty. We had a nice little 28-jet tune up in it so I figured what the hell lets do a safety pass and see how she liked the bottle.

    I ran it, the thing loved the bottle and ran a 8.10. I was stoked.

    We had pecker neck Tony Hammons with us helping out.( thanks Tony!) ( you prick) Hot shot Tony wanted to make a pass and he did. Same tune up, same air, same everything, and he ran a 8.00. I'm 250 hes was a little fat at the time and weighed 180.

    So 70 pounds in my rig was .1 quicker.

    Well I'm down to driving weight again (155) guess I better give it another shot, but with a 40 pill!!!

  9. #7
    Senior Member bp298's Avatar
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    Quote Originally Posted by Infomaniac View Post
    The guys that add weight to slow down can probably give good input. BP has experience adding weight and drag maybe he will chime in.
    too many variables to make a blanket statement. just one variable - if your entire package, driver included, weighs 1900lbs, losing 100lbs won't have the same effect as the 1500lb total package losing 100lbs. or even the 1800lb package losing 100lbs. removing weight is similar to adding power, in that you change the power/weight ratio. the difference between before/after power to weight ratio may be more relevant. lighter is always quicker, but how much is going to depend on what you're starting with.

  10. #8
    Nelson MFG Nelson's Avatar
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    Quote Originally Posted by bp298 View Post
    Quote Originally Posted by Infomaniac View Post
    The guys that add weight to slow down can probably give good input. BP has experience adding weight and drag maybe he will chime in.
    too many variables to make a blanket statement. just one variable - if your entire package, driver included, weighs 1900lbs, losing 100lbs won't have the same effect as the 1500lb total package losing 100lbs. or even the 1800lb package losing 100lbs. removing weight is similar to adding power, in that you change the power/weight ratio. the difference between before/after power to weight ratio may be more relevant. lighter is always quicker, but how much is going to depend on what you're starting with.
    thats the kind of input I'm looking for bob, that makes sence that a 5% decrease on a 2000lb package would not be equal to a 10% change on a 1000lb package although both changes are 100lbs

  11. #9
    Senior Member bp298's Avatar
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    Quote Originally Posted by Nelson View Post
    thats the kind of input I'm looking for bob, that makes sence that a 5% decrease on a 2000lb package would not be equal to a 10% change on a 1000lb package although both changes are 100lbs
    i know that sounds intuitively obvious, but try it this way. say a person has a 1500lb package with 500hp. removes 100lbs. the power to rate ratio improves by 2%. another person has a package that weighs 1500lb with 1400hp. removes 100lbs. the power to weight ratio improves by almost 7%.

    the kicker is, the effect of those two improvements may be entirely different, considering where they might have started, et wise. the faster a boat goes, the more it takes to get it to go faster.

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    Senior Member Sweet Pickle's Avatar
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    Brian I guess it is kind of a blanket statement but when we had big stack tanks in 10.00 Bracket we would ad 5 gallons (about 36 lbs) of gas to slow it about .05 secs or 10 gallons for the .1 seconds. We have a relatively light program so it responded well. So in ours 72lbs=.1 seconds

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    Quote Originally Posted by Sweet Pickle View Post
    Brian I guess it is kind of a blanket statement but when we had big stack tanks in 10.00 Bracket we would ad 5 gallons (about 36 lbs) of gas to slow it about .05 secs or 10 gallons for the .1 seconds. We have a relatively light program so it responded well. So in ours 72lbs=.1 seconds
    It may only be a general thought about the times, but both ballztech and Sweet Pickle had very similar results even though they ran different classes. Interesting.

  14. #12
    Senior Member Boat 405's Avatar
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    Bottom line. Lose as much weight as possible. Once you get beyond the major stuff, light boat, aluminum heads, aluminum block. Losing weight tends to get expensive exponentially.
    Boat 405.

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    Quote Originally Posted by widowmaker View Post
    Bottom line. Lose as much weight as possible. Once you get beyond the major stuff, light boat, aluminum heads, aluminum block. Losing weight tends to get expensive exponentially.
    One exception is going on a personal diet. For many its probably healthier, cheaper and the boat ends up running quicker.

    As a personal opinion, I doubt that removing weight will actually allow the boat to run more mph, well maybe little faster, it does make them quicker though.

  16. #14
    Senior Member Boat 405's Avatar
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    Quote Originally Posted by jimsplace View Post
    One exception is going on a personal diet. For many its probably healthier, cheaper and the boat ends up running quicker.

    As a personal opinion, I doubt that removing weight will actually allow the boat to run more mph, well maybe little faster, it does make them quicker though.
    I was speaking in regards to the boat. But after the holiday feasts all bets are off....
    Boat 405.

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