Need help with rules

[rcjonny]

Hello, My dad and I have been building a 91 mustang convertible over the winter or the street/strip. The car will run in the mid 12's I'm wonder what type of roll bar I am going to need. I want to put the least bars as I can since the car is a daily driver and I want to keep it as stock appearing as I can

Thank

Jon

[Sean Marconette]

Do you have access to a rule book? It looks like on page 309 Section 21, page 3 of the ET Quick Reference Chart that Quarter Mile ET's of 13.49 requires a rollbar with a convertable. I am pretty sure it will have to be a min of 6 point.

No matter what you do, install subframe connectors. If it is a stick make sure you weld the rear control arm mounts. Check around where the seats bolt to the car and check the floor pan in those area's for stress cracks. Just some things to look for, especially if it is a factory stick car that has had a hard life.

Sean

[Sean Marconette]

This is the rules for ET class 2013 NHRA Rulebook


FRAME: 4



Permitted. See General Regulations 4:2.
DEFLECTOR PLATE
Mandatory on rear-engine dragsters. See General Regulations 4:3.
GROUND CLEARANCE
Minimum 3 inches from front of car to 12 inches behind centerline
of front axle, 2 inches for remainder of car, except oil pan and
headers. See General Regulations 4:5.
PARACHUTE
Mandatory on any car that runs 150 mph or faster. See General
Regulations 4:8.
ROLL BAR
Roll bar mandatory in all cars (including T-tops) running 11.00
(*7.00) to 11.49 (*7.35), in convertibles running 11.00 (*7.00) to
13.49 (*8.25), and in all dune-buggy-type vehicles running 12.00
(*7.50) seconds and slower. Permitted in all cars. See General
Regulations 4:10, 10:6.

[jmcarter]

Of course there are lots of vendors making Mustang stuff but I'd recommend trying S&W, they have several options and can recommend the exact bar to meet your needs.

http://www.swracecars.com/store/1979...OSCAR_153.aspx

[Mark Yacavone]

Originally Posted by Sean Marconette

Do you have access to a rule book? It looks like on page 309 Section 21, page 3 of the ET Quick Reference Chart that Quarter Mile ET's of 13.49 requires a rollbar with a convertable. I am pretty sure it will have to be a min of 6 point.

No matter what you do, install subframe connectors. If it is a stick make sure you weld the rear control arm mounts. Check around where the seats bolt to the car and check the floor pan in those area's for stress cracks. Just some things to look for, especially if it is a factory stick car that has had a hard life.

Sean

Sean, I believe the old Lakewood style bar is still legal.
One A hoop , one back support, one side bar.
Not minimum 6 pt.... but maximum 6 pt.

[Sean Marconette]

Thanks Mark,
I did not see that in the rulebook for the ET classes. I missed the detail, it does show a 5 point.

I agree on the SW bar too.

Sean

[rcjonny]

Is this the style you are talking about

[jmcarter]

Mark, I had that kind of bar in a 10.90 car many years ago (with a OEM firewall) and was told not to come back with it....if you read 4:10 of the General Regs and view the illustration I can see how tech inspectors could easily interpret it as not fulfilling the book on a few fronts....just my 2 cents but see my earlier post...

[rcjonny]

Thanks for all the help guys. I think we are gunna go with the 6 point. I figure its gunna be the safest thing for my car.

Thanks
Jon

[treessavoy]

Guys,

Can you still run a bolt in roll bar or does it have to be welded?

JimR