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which gear with a 28" tire?

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Old Jan 13, 2003 | 06:16 PM
  #1  
alws6's Avatar
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Default which gear with a 28" tire?

my car is an M6 with heads, cam and a 150 shot. should i go with a 4.10 or a 4.30. my rev limeter is at 6800.
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Old Jan 14, 2003 | 12:17 AM
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Default Re: which gear with a 28" tire?

Al, for whatever it's worth, 4th gear is good to around 134 MPH with 4.30's on 28" tires (accounting for ½" of growth). Soon we'll get some baseline numbers for your setup with the 3.42's, then we'll look at your trap speeds and go from there. I'm thinking 4.30's. I'll tell you this, no matter what you run with the 3.42's, your times will improve drastically with a gear upgrade. You absolutely won't regret it.

If you don't mind sacrificing a bit of gas mileage, gaining a few RPM's at highway cruising speeds, and a little less traction on the street, more gear is the way to go, especially on the almighty 6-speed cars. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

4.56's rock!

Also, did you see my post about the 28" tire fitment? Here's the link, just in case. I'm getting some good feedback in there. We'll work it out to where they fit for sure with no rubbing on both of our cars, since even if I can't use your slicks this weekend, I'll still, in time, have to run 28's to finish the ¼-mile in 4th gear.

<img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
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Old Jan 14, 2003 | 09:18 AM
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Default Re: which gear with a 28" tire?

4.30s should work nice with nitrous. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
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Old Jan 14, 2003 | 11:02 AM
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Default Re: which gear with a 28" tire?

Hey Al, I would suggest getting the car to the track and seeing what kind of mph it puts down on the spray with the stock gears in it. I can't seem to remember even what the car ran as a bolt on cam'd car <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Anyways good luck on taking it to the track and keep me updated on how things are going, Im a little out of the Waco loop being down here in H-town

Sean
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