A smaller diameter tire that should help my quickness correct?
09-21-2003, 02:18 PM
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A smaller diameter tire that should help my quickness correct?
I wish I could play gears like the rear wheel drive people. Since I cant here is my solution. If I put some low profile tires on my 14" wheel. I should be quicker, but I will loose top end. I dont really care about top end since I dont think my sol will never have a need to get top end.
Is this correct?
Nick
Is this correct?
Nick
09-22-2003, 02:06 PM
#5
Re: (grndcont)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by grndcont »</TD></TR><TR><TD CLASS="quote">yes, a smaller diamiter rim\tire will make you quicker. but your trap speed will suffer (care?).</TD></TR></TABLE>
That's blatantly false. You'll get a faster trap because you'll have more effective torque. Bigger the slick, the more the traction, the lower the trap speed. Smaller the slick, the less the traction, the higher the trap speed. Smaller diameter = higher gearing = higher mph.
Example: I trap at 97.5mph on streets with my old setup. The tires were 24.2" diameter. When switching to slicks of the same diameter, it's usual to trap 2+ mph slower due to faster hookup and less acceleration time (less time spent on the 1/4 mile means lower mph). I tried 22" ET Streets and trapped at the same 97.5mph, except 0.2s faster (don't laugh, I hit the rev limiter 3 times).
That's blatantly false. You'll get a faster trap because you'll have more effective torque. Bigger the slick, the more the traction, the lower the trap speed. Smaller the slick, the less the traction, the higher the trap speed. Smaller diameter = higher gearing = higher mph. Example: I trap at 97.5mph on streets with my old setup. The tires were 24.2" diameter. When switching to slicks of the same diameter, it's usual to trap 2+ mph slower due to faster hookup and less acceleration time (less time spent on the 1/4 mile means lower mph). I tried 22" ET Streets and trapped at the same 97.5mph, except 0.2s faster (don't laugh, I hit the rev limiter 3 times).
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09-23-2003, 03:56 PM
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the reasoning is in your very own example, you said "with 24.2" tires u traped a 97.5mph at x et. but with a 22" tire your et was .2s faster". your mph was the same becouse the radial to slick contact patch change made up for the smaller diameter tire. by the way, when you make comparesons, try to keep all the veriables the same, as we were not talking about contact patch size, we were disscousing overall diameter changes, and there affect on et's.
09-29-2003, 07:39 AM
#12
Re: (ion_four)
Pseudo-science, lol, I like that 
Uhhh, how to explain...
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There's one axle (top O), wheel + tire diameter, then the contact patch.
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There's a smaller-diameter wheel + tire, almost the same effective contact patch (it actually decreases as the tire gets smaller but we'll ignore that).
Torque is applied through the center of the axle to twist the tire. So force has to be translated out through that lever arm. It's the reverse of the leverage concept - instead of getting more leverage with a longer arm, you're twisting through the center, so you get less twist with a longer arm. The smaller tire effectively puts more power to the ground that way. That's why you'll trap higher with a smaller tire.
Another way of saying it is in relation to gearing. The tires are the final say on the gears - shorter tires will cause your top speed in every gear to decrease because it's shortening your gearing. Shorter gears = more power. Obviously if you have to make an extra shift because you need 5th to finish the 1/4 mile, then the shorter tires won't help + will probably slow you down, but if you can still finish in 4th - albeit higher in 4th since you have shorter effective gearing - your trap will increase with a shorter tire.
Make more sense?
Uhhh, how to explain...
O
|
|
|
-
There's one axle (top O), wheel + tire diameter, then the contact patch.
O
|
|
-
There's a smaller-diameter wheel + tire, almost the same effective contact patch (it actually decreases as the tire gets smaller but we'll ignore that).
Torque is applied through the center of the axle to twist the tire. So force has to be translated out through that lever arm. It's the reverse of the leverage concept - instead of getting more leverage with a longer arm, you're twisting through the center, so you get less twist with a longer arm. The smaller tire effectively puts more power to the ground that way. That's why you'll trap higher with a smaller tire.
Another way of saying it is in relation to gearing. The tires are the final say on the gears - shorter tires will cause your top speed in every gear to decrease because it's shortening your gearing. Shorter gears = more power. Obviously if you have to make an extra shift because you need 5th to finish the 1/4 mile, then the shorter tires won't help + will probably slow you down, but if you can still finish in 4th - albeit higher in 4th since you have shorter effective gearing - your trap will increase with a shorter tire
. Make more sense?
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