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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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Old 07-15-2014, 10:30 AM   #9
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Well I'm gonna revive this thread. Got some 18" Z06 replicas and some 305's for em. We'll see if they make a difference.



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Old 07-15-2014, 10:57 AM   #10
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Good choice! I never had any 20" drag radials, but just being able to take them off and save the rubber when I'm not using them is worth having an extra set of wheels around. And if you're gonna buy drag wheels... why buy 20s.
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Old 07-15-2014, 11:00 AM   #11
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That actually looks very nice to me. Let us know how they hook up as I would like to do this at the same time as my stall. Enjoy
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Old 07-15-2014, 11:42 AM   #12
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oh im sure they'll hook up. i was hooking just fine with the 275 20" radials, these new 305 18" radials should only do a better job. plus the more meaty look is pretty awesome haha.
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Old 07-15-2014, 11:43 AM   #13
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Good choice! I never had any 20" drag radials, but just being able to take them off and save the rubber when I'm not using them is worth having an extra set of wheels around. And if you're gonna buy drag wheels... why buy 20s.
exactly my rational. i dont want to drive on drag radials all the time and eat up the tread. now i have a dedicated track tire and can swap em out as needed.
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Old 07-15-2014, 12:10 PM   #14
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I have a similar setup but run 305/45 18 Mickey Thompsons on my ZL1 that has a Yank torque converter. 1.50 60 fts.
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Old 07-15-2014, 12:41 PM   #15
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I have a similar setup but run 305/45 18 Mickey Thompsons on my ZL1 that has a Yank torque converter. 1.50 60 fts.
yea, same size tires here but theyre 555R's, and no stall. my best 60' was a 1.85 on the 20" radials. i really need a lower 60...im hoping these (plus some seat time) will help.
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Old 07-15-2014, 03:19 PM   #16
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I ran Nitto NT05rs before the Mickeys and my recommendation would be to go with the Mickeys once you use up the Nittos. They wear faster, I'm about to mount my second set, but stick much better. That being said, practice, practice, practice! I made about 300 passes on my Nittos, more on my old 2010 SS than my ZL1, and have run my Z about 300 passes. Starting to get the hang of it finally!
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Old 07-15-2014, 03:34 PM   #17
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Do you still have the 20's? If you do can you weigh them so we can exactaly what the weight savings is? If you are saving 10-15 pounds each, that would be a great.
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Old 07-15-2014, 04:26 PM   #18
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If I remember right had a lot of time on my hand last summer not much work.

stock 20" with nitto 555r 67lb

forgestar 18x11 with 305/45 MT 57lb

17" bogart with M&H dr 54lb

17" bogarts with slicks 42lb
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Old 07-15-2014, 06:08 PM   #19
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I don't have the 20's with the 555r's on them. They have Invo's on them now. Could still weigh them if you want.
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Old 07-18-2014, 09:05 AM   #20
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no problem hooking 800+whp on the 20" nitto 555r

https://www.facebook.com/l.php?u=htt...b8&h=qAQHunC32
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Old 07-19-2014, 10:07 PM   #21
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no problem hooking 800+whp on the 20" nitto 555r

https://www.facebook.com/l.php?u=htt...b8&h=qAQHunC32
Yea I'd say the hook just fine haha
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Old 07-19-2014, 10:23 PM   #22
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Quote:
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no problem hooking 800+whp on the 20" nitto 555r

https://www.facebook.com/l.php?u=htt...b8&h=qAQHunC32
DAMN did those hook! What gear are you running and do you road-track that thing?

Damn nice run!

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Old 07-20-2014, 08:46 AM   #23
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Doesn't that video show wheelspin through first and a 1.67 60 foot time?
If so, I certainly wouldn't say no problem.

What's that car capable of 60 footing? I'd guess 1.4's with a 4L80E and that kind of power?
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Old 07-20-2014, 11:00 AM   #24
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The 1.67 is the R/T. I didn't see wheel spin but I heard it. Not sure which one it was coming from though.
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Old 07-20-2014, 01:08 PM   #25
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No, the 1.67 is the 60 foot time.
It's even on his timeslip here: http://www.camaro5.com/forums/showpo...postcount=2611
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