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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 11-06-2013, 08:56 AM   #1
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difference between 18" and 20" drag radials?

so i know the obvious differences...less weight, and more sidewall on the 18's. but how much does that really affect your ET and MPH? i mean from the guys that have switched from one to the other, did you notice a big difference? from what i remember the generic formula says that every 100 lbs you loose is a 10th off your ET...but if you're only saving 10lbs or so is it even noticable?
and i get that its unsprung weight so the weigh loss will be more noticable as opposed to just pulling 10 lbs out of say the interior or wherever.

so long story short, is it really worth the extra cash to go from DR's on the oem 20's to 18's? in reality, how much could i gain from it?
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Old 11-06-2013, 09:11 AM   #2
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Only benefit I see is having more sidewall for the tire to work. Weight from the 20's to 18s isn't going to make a noticeable difference on a drag radial I don't think.
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Old 11-06-2013, 09:12 AM   #3
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so if im not having trouble hooking then its really not worth it?
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Old 11-06-2013, 09:49 AM   #4
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Once you start adding more power, the hooking part will get more difficult and the extra sidewall will benefit on the 18" vs the 20" but it's not going to be a huge difference between them. Just a slight advantage to the 18".
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Old 11-06-2013, 11:57 AM   #5
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I hooked on 20" 555R's until I did the converter, and then it was a struggle for me. I went 12.37@112 1.85 -488 DA air, I think I could have gone 12.2 with skinnies or other weight reduction. I went to 18" NT05R's then, still struggling with traction (or marginal tracks really), been 1.66-1.73's.
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Old 11-06-2013, 12:26 PM   #6
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yea the 20" 555R's are hooking right now for sure. so im trying to see if theres a reason to change down to 18's next season.
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Old 11-06-2013, 12:54 PM   #7
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Like John experienced, if you go with a stall converter, it becomes a little harder to hook. But when you do hook....HANG ON! Converter is by far my favorite mod.
Assuming you have tires to hold it. Otherwise it's frustrating as hell.
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Old 11-06-2013, 04:23 PM   #8
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Well that might do it right here. I plan on doing a stall this winter.
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