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| NHRA rules on DOT "drag radials" https://slantsix.org/forum/viewtopic.php?t=48768 |
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| Author: | bigslant6fan [ Wed May 09, 2012 11:12 am ] |
| Post subject: | NHRA rules on DOT "drag radials" |
How fast can I E.T. before I need a driveshaft loop, 3 inch wheel studs, or aftermarket axles? Thanks |
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| Author: | CNC-Dude [ Wed May 09, 2012 11:30 am ] |
| Post subject: | |
Even the most basic and slowest ET classes require a driveshaft loop and wheel studs. Other driveline requirements can be found in their rulebook. Go online to get one before you start any mods. |
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| Author: | Doc [ Wed May 09, 2012 11:50 am ] |
| Post subject: | |
My memory says: Drive shaft loop is required for 13.99 or faster, when using slicks (Non-DOT) and 13.00 when using street tires. (including DOT "Drag Tires") The loop must be installed with-in 6 inches of the front u-joint. Wheel stud rule is inturpreted a number of different ways but the "safe bet" is: use a open end lug nut and have the stud's end stick-out the end of the stud by the size of the lug's hex size. (3/4 hex = stud sticks-out 3/4 of an inch past the lug nut) Aftermarket axles are required of you run 10.99 or faster or when you run a spool. DD |
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| Author: | slantzilla [ Wed May 09, 2012 4:09 pm ] |
| Post subject: | |
13.99 with slicks, 11.49 with street tires for the loop. It makes no differentiation for drag radials or ET Streets. Lug must extend into the hex portion of the lug nut at least the diameter of the stud. IE: 1/2" diameter wheel stud must extend into the hex of the lug nut at least 1/2". |
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| Author: | DusterIdiot [ Wed May 09, 2012 4:38 pm ] |
| Post subject: | Local Rules too... |
Our local strip requires the driveline loop if you run a clutch and slicks no matter how fast you go...Open end lugnuts and long studs mandatory with slicks or drag radials. -D.Idiot |
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| Author: | Doc [ Thu May 10, 2012 9:43 am ] |
| Post subject: | |
Yes... it "interesting" how different tracks inturpret and apply the printed NHRA rules... differently.   Big D... Thanks for the correction on the wheel / stud rule. To be honest... that is the one that I see the most confusion / Tech discussions around. For me... I got to the point where I just make sure my race car has an open end lug nut... with the studs sticking out the open ends. No problems with that. In the end, it's about being safe... and not lookng like an idiot!. DD  
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| Author: | CNC-Dude [ Thu May 10, 2012 10:14 am ] |
| Post subject: | |
Its all about having fun, but being safe and keeping others safe is more important. |
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| Author: | slantzilla [ Thu May 10, 2012 4:31 pm ] |
| Post subject: | |
Doug, that is why it is best to always carry a rule book when travelling.  The 2 year belt rule is another one. IF the car does not require a harness for the ET it runs, the 2 year rule is void. |
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| Author: | DadTruck [ Thu May 10, 2012 6:50 pm ] |
| Post subject: | |
what is the the purpose of the stud length rule? |
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| Author: | Fopar [ Thu May 10, 2012 6:56 pm ] |
| Post subject: | |
Quote: 13.99 with slicks, 11.49 with street tires for the loop. It makes no differentiation for drag radials or ET Streets.
Lug must extend into the hex portion of the lug nut at least the diameter of the stud. IE: 1/2" diameter wheel stud must extend into the hex of the lug nut at least 1/2". So that they can be sure the nuts are on with the minimum engagement of at least the diameter of the studs. Richard |
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| Author: | slantzilla [ Thu May 10, 2012 7:23 pm ] |
| Post subject: | |
Quote: what is the the purpose of the stud length rule?
As Fopar said, to be sure there is prper engagement on the stud.Aftermarket wheels, especially Super Tricks, Welds, and such have a very thick center. You can mount them on stock length studs, but there is not even any stud sticking through the wheel. I've known people who ran tham that way, but I was always too scared of losing a wheel. 
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| Author: | DadTruck [ Fri May 11, 2012 4:49 am ] |
| Post subject: | |
thanks,, I had seen the long wheel studs and open lug nuts at the few drag races I have been to,, figured there must be a reason.. |
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| Author: | Mroldfart2u [ Fri May 11, 2012 6:15 am ] |
| Post subject: | |
Quote: thanks,, I had seen the long wheel studs and open lug nuts at the few drag races I have been to,, figured there must be a reason..
Yep, and its also most;y a C.Y.A. affair for alot of the racers. Better to have and not need....
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| Author: | billdedman [ Fri May 11, 2012 10:38 pm ] |
| Post subject: | |
I have aftermarket (Moser) axles and they came with long studs (9/16"-diameter.) I run open-ended lug nuts and the studs stick out the ends of the nuts a fair distance (maybe half an inch.) I am about as far from an engineer as anyone you could find, and in my ignorance, I find myself wondering what earthly purpose a rule would serve that would require the stud to protrude any distance at all, beyond the end of the lug not; there is NO load on it. Could somebody who understands this stuff explain it to me, please? Or, is there no such rule??? I am (obviously) clueless... Bill, in Conway, Arkansas |
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| Author: | CNC-Dude [ Fri May 11, 2012 10:50 pm ] |
| Post subject: | |
It is probably that much longer to accomodate the various wheel thicknesses that are out there. Since not all wheels are the same in that area, its doesn't stick out of the lugs as far on some brand wheels as others. |
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