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Old 09-04-2017, 05:41 PM   #1
mulisha
 
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Rotating weight

Been running 305/50/r20's with a heavy ibeam wheel from jesse james, approx weight 90lbs... Just picked up some light 18's with hoosiers on them.. Approx weight 63 lbs.... How many tenths do ya think i can pick up in the8th with them.... Thanks.
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Old 09-04-2017, 07:52 PM   #2
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What size Hoosiers? How was traction with the 305s?
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Old 09-04-2017, 08:31 PM   #3
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Quote:
Originally Posted by unfinished business View Post
What size Hoosiers? How was traction with the 305s?
29.5 in tall.. Traction was pretty good with the heavy's... Just thought, shaving 30+ lbs per corner would help.
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Old 09-04-2017, 09:35 PM   #4
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pics!!!!
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Old 09-04-2017, 10:02 PM   #5
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Light Wheels Vs Heavy Wheels - Wheel Tech - Comparison - Car Craft - Hot Rod Network
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Old 09-04-2017, 10:15 PM   #6
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That's neato. Real life tests are cool and rare
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Old 09-05-2017, 05:48 AM   #7
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Thank you
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Old 10-20-2017, 11:20 AM   #8
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Quote:
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Thank you
Have you raced with the lighter setup yet?
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Old 10-20-2017, 12:30 PM   #9
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I've been wanting to run this test on a prostreet truck for quite some time. I'd think results would differ with a lightweight diesel truck (4500 lbs) vs. it's gas counterpart.

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Old 10-20-2017, 02:50 PM   #10
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My buddy just texted me....stock 2017 Ford, 412rwhp. Stock on 37s and 22s......400rwhp. Less of a loss than I would have thought.
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Old 10-20-2017, 06:59 PM   #11
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I know someone who picked up three tenths in the 1/8th running with emergency brake on in a 3rd gen CR Dodge..
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Last edited by RascalMafia; 10-20-2017 at 07:01 PM.
 
Old 10-20-2017, 10:37 PM   #12
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Hahahahaha ^ Did I see the test on a carbon fiber driveshaft here or elsewhere? I know it was on a truck in California. Picked up 7 or 17hp. Interesting results as well

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Old 10-21-2017, 07:32 AM   #13
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Quote:
Originally Posted by JQmile View Post
My buddy just texted me....stock 2017 Ford, 412rwhp. Stock on 37s and 22s......400rwhp. Less of a loss than I would have thought.
I haven't seen a great correlation between unsprung weight reduction and dyno "gains". Usually the track will show better results. Just my experience.
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Old 10-23-2017, 12:25 PM   #14
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Tenths is a big term in drag racing. Thousanths or hundreds, are more common with rotating weight changes.

However iirc when we did this same test over 10 years ago I seem to remember .008 -.010 was what we dropped in ET. And gained couple mph... Point is it did help
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Old 10-23-2017, 06:11 PM   #15
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Well, sort of...on my duramax I would go from running a 12.0-12.1 to solid 11.80s by just switching from my 20s with street tires to pyos and drag radials.



Quote:
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Tenths is a big term in drag racing. Thousanths or hundreds, are more common with rotating weight changes.

However iirc when we did this same test over 10 years ago I seem to remember .008 -.010 was what we dropped in ET. And gained couple mph... Point is it did help
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