What tire size for a turbo car w/ 3.31 gears - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 13 Old 09-16-2008, 07:59 PM Thread Starter
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What tire size for a turbo car w/ 3.31 gears

I'm wondering what tire size I should run with a HCI T70 turbo lx for quarter mile. The car has a tko 600 and a 3.31 rear gear? 26 inch or 28 inch rear tire? Any input appricated! thanks...

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post #2 of 13 Old 09-16-2008, 09:28 PM
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Depends on what kind of power it makes, what you want your redline/going through the traps to be, and how fast you expect it to run in the 1/4, mph wise.


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post #3 of 13 Old 09-16-2008, 09:54 PM Thread Starter
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It makes in the 520 range, I was planning on shifting the car at 6000, trapping 120ish, but I'm not sure...
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post #4 of 13 Old 09-16-2008, 10:37 PM
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Run a 28" tire. I should think with a good run you'll be trapping much higher then 120ish, more in the 130 range. What kinda torque is it making?

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post #5 of 13 Old 09-16-2008, 10:41 PM Thread Starter
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post #6 of 13 Old 09-16-2008, 10:43 PM Thread Starter
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now, why run a 28? run a 28 because of the high mph?
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post #7 of 13 Old 09-16-2008, 11:03 PM
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I agree, a 28" tire would probably work better. They hook better than a 26", you will more than likely be able to leave harder, and they will keep your RPM's down on the top end.

edit: Actualy, with the 3.31 rear gears, you might be better off with the 26"s. Your top mph @6000rpms with the 28" tires would be around 150mph, where as with the 26" tire, it would be around 140. Either one would work, but the more mechanical advantage, the better in most cases.

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post #8 of 13 Old 09-16-2008, 11:03 PM
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Plus more sidewall. I believe there is a formula you can find if you google search it.

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post #9 of 13 Old 09-16-2008, 11:06 PM
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Quote:
Originally Posted by FN RCKT View Post
I agree, a 28" tire would probably work better. They hook better than a 26", you will more than likely be able to leave harder, and they will keep your RPM's down on the top end.

Stock block?
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post #10 of 13 Old 09-17-2008, 06:46 AM Thread Starter
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yes stock block

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post #11 of 13 Old 09-17-2008, 08:00 AM
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With that gear ratio your best bet is going to be 26” tires. While 28” would certainly hook better, it would lower your RPM too much on the big end and most likely result in slower ET’s and trap speeds.

I’m with Bently429 though, your most likely going to be closer to the 130mph range. If you were to go with something along the lines of a 275 50 15 drag radial….at 130mph your looking at 5600rpm in 4th. Conversely, if you went with a 28” tire….say something along the lines of a 275 60 15 drag radial…at 130mph your looking at a little over 5100rpm, which IMHO far too low of an RPM range.

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post #12 of 13 Old 09-17-2008, 03:27 PM
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Generally its 26" tire for 3.27's and 28" tire for 3.55's depending on what your planning on or are trapping. Millhouse is right but I think you would benifit from the taller tires in the 60'. I run 3.55's and 28's in my car.

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post #13 of 13 Old 09-17-2008, 04:59 PM Thread Starter
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Thats exactly the information I was looking for. 5100 is far to low of an rpm to be crossing the traps, I'll have to see how the car hooks on 26's, I'd be happy with a 1.6
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