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Old 11-15-2011, 05:11 PM   #1
Glenn Price
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Default wheelspeed, tire size & gear ratio

Any thoughts on running a taller tire to utilize wheel speed with the present gear. Is there any et to be gained here.
Presently 4.30 gear 33.5X17X16 tire and wanting to go to the 34.5 tire. Will I hurt or help et?
632ci, 2350lb. pg, single stage nitrous, single carb.
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Old 11-15-2011, 05:21 PM   #2
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Default Re: wheelspeed, tire size & gear ratio

IT might make the car a leave very hard , don't no how your stuff is know ???
but if you need wheel speed it will help.
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Old 11-15-2011, 06:58 PM   #3
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Default Re: wheelspeed, tire size & gear ratio

I run a 4:30 gear with a 33.5 tire 622 etc. I am happy with mine, not saying it couldn't be better with a different tire......I would just try it.
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Old 11-15-2011, 08:41 PM   #4
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Default Re: wheelspeed, tire size & gear ratio

How do you know increased wheel speed will improve the ET? Do you have a data logger that indicates a need for increased wheel speed? You might go faster with LESS wheelspeed.

I could not get over the added weight when we went from 33.0 tall Hoosier on 16 x 15 wheels with screws to 33.5 tall Hoosier on 17 x 16 double beadlocks...total increase of 45#! I hate to think what the increase will be if we ever go to a 34.5 tire! We have not tried the 33.5 tire & beadlocks yet, but have been 1.040 60' with baby 582 single carb on 2 stages @ 2300# on 33 Hoosiers on 15" wheels. Have 3.90 reat gear with Glide & 1.80 first gear
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You will just have to try it. Good luck.
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Old 11-15-2011, 09:21 PM   #5
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Default Re: wheelspeed, tire size & gear ratio

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Originally Posted by fofo View Post
How do you know increased wheel speed will improve the ET? Do you have a data logger that indicates a need for increased wheel speed? You might go faster with LESS wheelspeed.

I could not get over the added weight when we went from 33.0 tall Hoosier on 16 x 15 wheels with screws to 33.5 tall Hoosier on 17 x 16 double beadlocks...total increase of 45#! I hate to think what the increase will be if we ever go to a 34.5 tire! We have not tried the 33.5 tire & beadlocks yet, but have been 1.040 60' with baby 582 single carb on 2 stages @ 2300# on 33 Hoosiers on 15" wheels. Have 3.90 reat gear with Glide & 1.80 first gear
.
You will just have to try it. Good luck.
You'd be surprised that the 33.5's vs 34.5s there is little weight difference.
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Old 11-15-2011, 09:24 PM   #6
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Default Re: wheelspeed, tire size & gear ratio

you will be changing a serious amount of rollout there.You will need a very stout engine to improve with that much tire.
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Old 11-15-2011, 09:59 PM   #7
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Default Re: wheelspeed, tire size & gear ratio

Good to hear Jeff...as Vinny alluded to on topic, I just hope my lil motor can turn the larger tire!
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Old 11-15-2011, 10:04 PM   #8
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Default Re: wheelspeed, tire size & gear ratio

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Originally Posted by fofo View Post
Good to hear Jeff...as Vinny alluded to on topic, I just hope my lil motor can turn the larger tire!
No disrespect to you.but on a good track i have saw 3000hp blower cars planked down.33.5 tire can get quite a bit done.
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Old 11-15-2011, 10:07 PM   #9
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Default Re: wheelspeed, tire size & gear ratio

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Good to hear Jeff...as Vinny alluded to on topic, I just hope my lil motor can turn the larger tire!
I have saw alot of good engines hurt with too much tire on them.A guy drops to much timing and cant get up on the tire you can fight allot of handling issues with car heading left or right.I would stay smaller tire and play with gear.imo
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Old 11-16-2011, 07:19 AM   #10
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Default Re: wheelspeed, tire size & gear ratio

There is an approximate weight difference per tire of 2-3 lbs.
Not significant at all, also dealing with unsprung weight.
Wheelspeed being with similar rpm on a taller tire being further down the track. As far as pulling the bigger rollout, an increase in nitrous shot or length of time could more than compensate.
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Old 11-16-2011, 07:58 AM   #11
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Default Re: wheelspeed, tire size & gear ratio

Something to consider on the bigger tire deal. We took a coventional headed 565 with one kit on it out of a 2950lbs car with a 16 x 34 tire on it that had been 4.75 @ 148 put it into a 3250lbs car with the same tune up and ran a 4.78 @ 149. Both these numbers were ran in similar conditions but at different track, but I still believe that the big tire is holding the lighter car back, because that little motor just doesn't need the tire.
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Old 11-16-2011, 09:18 AM   #12
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Default Re: wheelspeed, tire size & gear ratio

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Originally Posted by Vinny V View Post
you will be changing a serious amount of rollout there.You will need a very stout engine to improve with that much tire.

more times then not, we've seen guys who think they will pick up going to a bigger tire, slow down... especially with a little engine... so i agree with vinny..

jay
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Old 11-16-2011, 09:22 AM   #13
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Default Re: wheelspeed, tire size & gear ratio

Don't want to get too off topic...but on our '69 Camaro @ 3000# with 665 with 2 stages, we went faster on the MT 33 x 10.5W than the Hoosier 33 x 15. The larger tire would tend to want to shake, where it was much easier to get up on the tire with the smaller 10.5W. FWIW.
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Old 11-16-2011, 09:22 AM   #14
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Default Re: wheelspeed, tire size & gear ratio

Quote:
Originally Posted by BBCStang View Post
Something to consider on the bigger tire deal. We took a coventional headed 565 with one kit on it out of a 2950lbs car with a 16 x 34 tire on it that had been 4.75 @ 148 put it into a 3250lbs car with the same tune up and ran a 4.78 @ 149. Both these numbers were ran in similar conditions but at different track, but I still believe that the big tire is holding the lighter car back, because that little motor just doesn't need the tire.
that much weight and ran the same ..cool !!!!!
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Old 11-16-2011, 09:48 AM   #15
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Default Re: wheelspeed, tire size & gear ratio

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that much weight and ran the same ..cool !!!!!
I'm sorry, should have stated the heavier car had a 275/60/15 hoosier DR on it. so the tire size difference was as drastic as the weight.
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