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#1 |
Junior Member
Join Date: Oct 2012
Location: Sydney , Australia
Posts: 97
Likes: 23
Liked 43 Times in 25 Posts
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hi,
long time watcher from Australia with a tyre question Is there much to be gained (or lost) from going from a 275/60R15(28") Hoosier to a 30x9 Radial ? Bit less sixty foot , more MPH ? Better footprint for traction ? I have a 68 Satellite with a 440+0.055,TF727,5000 stall , 4.10 geared Strange 60 . Caltracs,Rancho rear shocks,QA1 front shocks . Average sixty is 1.52/3, best of 1.50. Car weighs 3657lbs with me in it .Ran 10.965@115 on the brakes on Saturday.Car is a daily driver street car .Car is foot braked , at least for the time being Your cars are the nearest to how I like to run mine though I run Super Street , 11.00-12.99 DYO, no Stock /Super Stock like you here plus my wallet isn't that deep ![]() Any thoughts appreciated Tex |
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#2 |
Member
Join Date: Nov 2012
Location: Minnesota
Posts: 101
Likes: 89
Liked 62 Times in 17 Posts
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Is 4.10 going to be enough gear when going to a taller tire...Hoosier 18210C07?
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#3 |
Member
Join Date: Nov 2008
Posts: 109
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I would guess ET may be quicker by a few due to a harder hook and mph will decrease a few due to less wheel speed at the hit.
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#4 |
Junior Member
Join Date: Oct 2012
Location: Sydney , Australia
Posts: 97
Likes: 23
Liked 43 Times in 25 Posts
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#5 |
Senior Member
Join Date: Nov 2007
Location: Div. 6, Eastern, WA
Posts: 709
Likes: 2,666
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Assuming good traction, a change to a 30 inch tall tire would require roughly a 4.4 gear to turn the engine the same RPM, so if you can take a little more RPM a 4.56 gear should work nicely. & be quicker. (depending on your powerband)
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Dave Noll, EF/S ,?/SA 6526 |
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#6 |
Junior Member
Join Date: Oct 2012
Location: Sydney , Australia
Posts: 97
Likes: 23
Liked 43 Times in 25 Posts
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thanks Dave,
funny as it seems I only shift at 6000,trap around 63/6400. not sure of pulling harder with the rods(ly with ARP bolts),peak power on chassis dyno is around 5500 but pulls happily to 6500 never went past here I did used to run 3.9 gears with the 28" as to quicker with more gear - car is able to run faster than the class Tex |
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