Instead of changing out my rear gear I am thinking of dropping down from a 28" tire to a 26" does any one have an idea how much that would affect my top end rpm currently I use a 3.73 rear gear.
Thanks
Roy
tire change
Moderator: John_Heard
Re: tire change
Should be equal to approximatley a 4.02 gear. So if you were running 7000 rpm before, you would be running roughly 7500 now.
Re: tire change
I'd suggest trying the calculator on the Mark Williams website. It's pretty good. Youi'll want to figure out what your runout is on those tires and try to guesstimate your rpm loss through the converter, but you should be able to get pretty close with this calculator.novaz wrote:Instead of changing out my rear gear I am thinking of dropping down from a 28" tire to a 26" does any one have an idea how much that would affect my top end rpm currently I use a 3.73 rear gear.
Thanks
Roy
I used this when I selected my gear ratios and tire size in my first build out.
http://www.markwilliams.com/calculators.aspx
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline
http://www.marsh-racing.com/harrys_camaro-1.htm
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline
http://www.marsh-racing.com/harrys_camaro-1.htm
Re: tire change
i had 4.88 gears and a 27" tall tire i went through @7600 a 29" went through @ 7200 a 30 went through @7000 its about 200 rpm per inch from my experience hope the info helps
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