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revolutionary
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« on: July 06, 2010, 12:46:15 PM » |
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Does anyone (DW maybe?) know if there is a specific ruling as to the rated speed for drag radials? Looking closely at the rulebook I see various ratings for OEM - vr/ZR rated tires but the drag radials such as Mickey Thompsons don't have a speed rated letter i.e. 255/75R15. They are listed under their 'Strip' section on Mickey Thompson's website and the description reads "this D.O.T. approved street legal drag radial will get your car down the track in record time and drive you home with sure handling and an excellent ride" indicating it is a tire made specifically for racing that happens to be street legal. I would read that as being within the "Special tires for racing as designed by the manufacturer" rule and would certainly feel safe running them at 240 but my opinion doesn't realy matter here. I'd like to know for sure if there has been such a ruling on these.
Thanks
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dw230
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« Reply #1 on: July 06, 2010, 01:27:16 PM » |
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I am not sure about the use of drag radials for LSR. You may want to contact either Lee Kennedy or Kiwi Steve Davies, both are in the rulebook. Maybe some one else can jump in here.
DW
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1212FBGS
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« Reply #2 on: July 06, 2010, 01:44:37 PM » |
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not recommended for motorcycles  Kent |
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Cajun Kid
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Venable Rod's & Racing #805 Studebaker, #806 Ford
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« Reply #3 on: July 06, 2010, 04:17:41 PM » |
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I recall being told MT Drag Radial Racing Tires approved up to 225mph or 250mph... Since all I need is 215mph, I can't full rememeber which was the max mph 225 or 250. The same MT or Goodyear drag race radial slick (non street legal) is Ok to 250 from what I read... I would think the street legal version may be as good or better for LSR as it "seems" to have a slightly stiffer side wall... I ran them on the Vicky at Maxton and they felt more loosey gooesy on the rear, so I went back to V rated BFG G Force Sports (extreme summer tires) and felt very stable... May be I did not have enough air in the MT Drag Radials for LSR  Charles |
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ECTA Record Holder Maxton E/CBFALT, E/CBGALT, E/CGALT, E/CFALT, A/CGALT, C/CGALT, D/CGALT, C/CBGALT, B/CBGALT, C/CFALT OHIO C/CGALT LTA Record Holder A/CBFALT, B/CBFALT, C/CBFALT, C/CFALT, E/CGALT, E/CFALT Fastest Standing Mile at Ohio 195.51mph Fastest Standing Mile at Maxton 191.006mph Fastest Standing 1.5 Mile at Loring 188.31mph http://s261.photobucket.com/albums/ii43/cajunkid5690/Blog www.venablerodsandracing.comemail venableracing@gmail.com |
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NathanStewart
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« Reply #4 on: July 06, 2010, 04:43:00 PM » |
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Last year I inspected a Toyota Celica that we had to limit the speed on because there was zero supporting info on the speed rating for the M/T drag radials that were on the front of the car. The decision at that time was that we would need to see actual M/T documation stating a speed rating before the speed limit would be lifted. Unfortunatley, "I heard they were rated..." won't get you through tech. Bring a piece of paper with you from the tire manufacturer that says exactly what they're rated to.
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jdincau
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« Reply #5 on: July 06, 2010, 05:44:04 PM » |
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This may be a dumb question but doesn't "DOT approved" mean that they have a rating and it is branded on the tire?
Just went and looked at the MT web site. The only ones advertised as DOT approved are the ET Drag motorcycle radial, the ET street, the ET street radial and the ET street radial II. None of the 6 "ET Drag" labeled tires are DOT approved and the ET front has a disclaimer saying it is not approved for land speed use.
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« Last Edit: July 06, 2010, 05:54:23 PM by jdincau »
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"We can never select the one result we want to the exclusion of all others"
David Pye
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revolutionary
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« Reply #6 on: July 07, 2010, 09:19:18 PM » |
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Waiting to hear back from Kiwi Steve for the official word
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Cajun Kid
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« Reply #7 on: July 07, 2010, 09:20:45 PM » |
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Waiting to hear back from Kiwi Steve for the official word
Please let us know what he said. Thanks Charles |
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ECTA Record Holder Maxton E/CBFALT, E/CBGALT, E/CGALT, E/CFALT, A/CGALT, C/CGALT, D/CGALT, C/CBGALT, B/CBGALT, C/CFALT OHIO C/CGALT LTA Record Holder A/CBFALT, B/CBFALT, C/CBFALT, C/CFALT, E/CGALT, E/CFALT Fastest Standing Mile at Ohio 195.51mph Fastest Standing Mile at Maxton 191.006mph Fastest Standing 1.5 Mile at Loring 188.31mph http://s261.photobucket.com/albums/ii43/cajunkid5690/Blog www.venablerodsandracing.comemail venableracing@gmail.com |
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revolutionary
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« Reply #8 on: July 11, 2010, 02:26:03 PM » |
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Looks like we'll be able to at least give them a try. We'll bring backup tires in case but really want to try to get these approved permanantly for future racers.
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« Last Edit: July 12, 2010, 09:03:18 PM by revolutionary »
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NathanStewart
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« Reply #9 on: July 13, 2010, 02:47:21 PM » |
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I still think the safest thing to do would be to contact M/T for speed rating info. Are you just going to run 'em until they fail and then we'll know their speed rating?
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jimmy six
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« Reply #10 on: July 13, 2010, 02:55:24 PM » |
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Whats a drag radial look like with 60 PSI in them on an 8 or 10" rim? Just courious......
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First GMC 6 powered Fuel roadster over 200, with 2 red hats. Pit crew for Patrick Tone's Super Stock #49 Camaro
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Stan Back
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« Reply #11 on: July 13, 2010, 04:26:42 PM » |
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"Are you just going to run 'em until they fail and then we'll know their speed rating?"
Only if they fail in the lights.
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Member of the San Berdoo Roadsters – California's most-exclusive roadster club.
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revolutionary
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« Reply #12 on: July 13, 2010, 08:21:39 PM » |
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I got a reply back from Steve that said we could run them on a trial basis with inspections between progressively faster runs. That is exactly the kind of response that I was looking for and shows an openess to new ideas.
As far as running them til they fail - lets hope that never happens.
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NathanStewart
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« Reply #13 on: July 14, 2010, 09:50:53 AM » |
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I STILL don't understand why you haven't contacted M/T.
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Cajun Kid
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Venable Rod's & Racing #805 Studebaker, #806 Ford
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« Reply #14 on: July 14, 2010, 10:17:17 AM » |
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I STILL don't understand why you haven't contacted M/T.
I have in the past spoken to MT... "for liability reasons" they will not even answer a question once you say Land Speed Racing as it pertains to those tires. They say those tires are for short distance drag racing at high speeds. I then reworded my question,, I asked OK,,, "on the drag strip" would the tires be OK for 225 to 250 MPH.... the answer was yes because they are only at top speed for a few seconds. So no real good answer. Just relaying my experience calling MT... Hope whomever calls again gets a more decisive answer than I did. Charles |
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ECTA Record Holder Maxton E/CBFALT, E/CBGALT, E/CGALT, E/CFALT, A/CGALT, C/CGALT, D/CGALT, C/CBGALT, B/CBGALT, C/CFALT OHIO C/CGALT LTA Record Holder A/CBFALT, B/CBFALT, C/CBFALT, C/CFALT, E/CGALT, E/CFALT Fastest Standing Mile at Ohio 195.51mph Fastest Standing Mile at Maxton 191.006mph Fastest Standing 1.5 Mile at Loring 188.31mph http://s261.photobucket.com/albums/ii43/cajunkid5690/Blog www.venablerodsandracing.comemail venableracing@gmail.com |
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