Tube chassis NHRA requirements

[Anonymous_User]

Just wondering out loud:

What are the NHRA requirements for tube chassis' to be certified for 9 seconds?

A chassis based on rectangular tubing would have to be fabricated out of what size material? What thickness?

Chorme moly vs. mild steel?

MIG welding acceptable?

Etc. etc.

What is looked at for certification on a stock chassis vehicle as it nears/enters the 9 second zone?

[BadAssPerformance]

What is looked at for certification on a stock chassis vehicle as it nears/enters the 9 second zone?

According to the NHRA book a 10 point cage in a unibody is good till 7.50.

A full chassis car is not detaile din teh book but it refers to the SFI book.

[powermaxx]

According to the NHRA book a 10 point cage in a unibody is good till 7.50.

A full chassis car is not detaile din teh book but it refers to the SFI book.


8.50's is all with a 10pt (they changed the rules last year? Ask me how I know $$$$$$$$$$$). Any faster and it needs a Funnycar cage and additional triangulated cross bracing to get to 7.50's (I know, just went thru updating and recert on the Challenger). MS is only good for 7.50 also, any faster than that and it has to be Chromemoly. MIG or TIG on the MS but only TIG for CM. I have a mix of round and rectangular MS tubing, inspector seemed okay with that.

A unibody car can get by with less "chassis" in some cases: Less than 1sqft modifed firewall/trans tunnel or something along those lines. I'd have to go over the book to find it.

I also have the SFI (25.1E I think. C.R.S., sorry) book but it's at my chassis guys shop right now.

Hope that helps.

[Russ Jerome]

What are the NHRA requirements for tube chassis' to be certified for 9 seconds?

A chassis based on rectangular tubing would have to be fabricated out of what size material? What thickness?

Chorme moly vs. mild steel?

MIG welding acceptable?

Etc. etc.

What is looked at for certification on a stock chassis vehicle as it nears/enters the 9 second zone?

2"x2"x .058" square MS tube acceptable,no mention of lesser thicknes
for moly. Mild can be Tig or Migged but Moly only Tigged.

When you start looking at being legal the rules change drasticaly
depending on what your finished chassis is: modified firewall, alterd
wheel wells, alterd WB ect.

If your building a fun toy for yourself all your gonna need is a cage
but if you want to compete you need to build your complete car
around the NHRA/IHRA guidlines for the class you want to pursue.
Keep it under 150mph and you wont need a chute!

example: I am putting a car together in my garage, I recently found
out that because I have an alterd firewall, non stock motor using an
automatic I sudenly will only be able to compete with Pro Outlaw RWD
cars of the Import drag series....looks like I'll be staging with the locals
in the slow lanes :(

[DblTrbl]

Russ, you can also run the Quick 16 class.

Also, here is the link to the NHRA sport compact rule books: http://www.nhrasportcompact.com/2006/rules/index.html

[BadAssPerformance]

...they changed the rules last year? Ask me how I know $$$$$$$$$$$....

yeah, thought the rules might have changed... I quoted the 2002 SC book.

[Anonymous_User]

So, one could build a chassis from 2"x2" x .058" mild steel square tubing. Install a 10-point cage. Then you could modify the firewall as much as you want?

Not interested in a specific class, just legal to run.

I'll probably never have any car faster than high 9's and that definitely won't be a front driver. Hopefully in the next couple years my RWD will get juiced into the single digits!