Regarding NHRA rules w/ Nitrous

Lifted94XLT

Member

Jun 25, 2008

139

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16

Shawnee, KS

Jan 25, 2010

#1

• Jan 25, 2010

• #1

Kind of a dumb questions as I think I already know the answer, but I wanna make sure. Do I still need to fabricate a firewall in my coupe behind my rear seats (the factory fiberboard one is deteriorated) if I'm gonna have a blow down tube exiting the car? I think I do, but I thought I'd verify with those that are more fimiliar that I am on the rules. Thanks

--Ryan

 

tannerc91gt

This last 25% is foreign territory at this point

Founding Member

Nov 29, 1999

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Indiana

Jan 25, 2010

#2

• Jan 25, 2010

• #2

this is how ive always been told-

the blowdown tube is needed for vehicles that dont have a seperation between the cabin and the bottle ( a hatchback for example)
It isnt needed in coupes

but if you say yours is falling apart, the blowdown tube should be sufficient for tech inspection

 

Lifted94XLT

Member

Jun 25, 2008

139

1

16

Shawnee, KS

Jan 25, 2010

#3

• Jan 25, 2010

• #3

Perfect!! I have to build something for behind the seats, so I may build on anyway, justin case. I appreciate the help and the clarification> Thanks!

--Ryan

 

BlownFiveLiter

have car, will race....wait, it doesn't run

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Nov 29, 1999

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Chicagoland

Jan 26, 2010

#4

• Jan 26, 2010

• #4

I've always understood it to be the same thing that tanner is saying. A quick call to your local NHRA track should be able to confirm it.

 

RYC CUKR

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May 19, 2002

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Orlando

Jan 27, 2010

#5

• Jan 27, 2010

• #5

If you have a blowdown tube then you do not need a firewall.

If you do not have a blowdown tube then you need a firewall, even in a coupe. NHRA does not consider the fiberboard or rear seat back a firewall. At most tracks around here you can get away with out having a blowdown tube if the bottle is in the trunk with no firewall but if they want to be sticklers they can fail you during tech.