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Post by sg3526 on Dec 18, 2011 22:30:18 GMT -6
If you aren't required to have a cage you don't have to have a sfi date coded net. What I'm saying 440dart is, if you are slower than 6.39 and have an unaltered firewall and floor you aren't required to have a cage. Therefore an old outdated net is fine in your car even if you have a cage. Wrong probrd.... Rulebook says ANY car that has a cage is required to have a window net and that net has to be certified every two years. So if your car is running 10.50s and has a cage you still need a net.
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Post by probrd on Dec 22, 2011 18:43:25 GMT -6
Here is what the rulebook says:
WINDOW NET Window net meeting SFI 27.1 mandatory in any full-bodied car required by the rules to have a roll cage. See General Regulations
I must comprehend what it is saying different than you then. In reading this it doesn't say any car with a cage. It says any car REQUIRED by the rules to have a roll cage. Some cars have roll cages but they aren't required to have them by the rules.
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leep
Rookie
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Post by leep on Jan 1, 2012 13:17:56 GMT -6
catch 22,in reading 2012 nhra rulebook,please tell me where i am wrong on the car i purchased last fall and trying to make pass nhra tech. i have not run car but prrev owner said ran 6:80's 1/8 mile. here is prob. has roll cage of 1 5/8 tube but does not have lower sill pipe along door rocker or lower winshield(dash) pipe with altered firewall. so i thought will just slow car down some and run or 7:00 1/8 mile or 11:00 1/4 then just need roll bar not cage. but rule book then says pipe must be 1 3/4" not 1 5/8" on roll bar. am i missing something here! feel like butting my head against the wall, or start drinking again!!!
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Post by dennismopar73 on Jan 1, 2012 14:08:06 GMT -6
1 5/8 bar wont pass tech, but if the car been at same track, no-one cares
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leep
Rookie
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Post by leep on Jan 1, 2012 14:30:13 GMT -6
if i made the decision to have the two bars added to the cage thats in the car now and and a couple of other things done,any recommendations as to a shop that i could contact for the work. (my welding would be flunked in a heartbeat!!) i reside approx 1 1/2 hr drive west of st charles mo.
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Post by dennismopar73 on Jan 1, 2012 14:38:40 GMT -6
depending on where you a there are several, , even some on this net that can get it done for you
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leep
Rookie
Posts: 13
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Post by leep on Jan 1, 2012 14:56:41 GMT -6
i live in the columbia missouri area
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Post by doughboy692 on Jan 1, 2012 19:26:04 GMT -6
catch 22,in reading 2012 nhra rulebook,please tell me where i am wrong on the car i purchased last fall and trying to make pass nhra tech. i have not run car but prrev owner said ran 6:80's 1/8 mile. here is prob. has roll cage of 1 5/8 tube but does not have lower sill pipe along door rocker or lower winshield(dash) pipe with altered firewall. so i thought will just slow car down some and run or 7:00 1/8 mile or 11:00 1/4 then just need roll bar not cage. but rule book then says pipe must be 1 3/4" not 1 5/8" on roll bar. am i missing something here! feel like butting my head against the wall, or start drinking again !!! If the floor has not been altered you dont need rocker bars. You are allowed to modify the floor up to 6 square feet for transmission removal/maintence before you have to install rocker bars. As for your firewall. What was modifed and how much? If its less than one square foot and was done to make it easier to get the transmission out you are again ok. Removing the HVAC unit and installing a panel over the hole does not count as a modifed firewall.
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leep
Rookie
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Post by leep on Jan 2, 2012 13:06:06 GMT -6
complete floor altered, just alum sheet. same with firewall! i dont comprehend why nhra says 1 5/8 ok for rollcage but then require 1 3/4 for roll bar when car going at a slower speed.
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92ga
Full Member
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Post by 92ga on Jan 2, 2012 18:19:12 GMT -6
Because a cage is stronger than just a roll bar. Just be sure that whom ever welds it in uses the correct method for the tubing you have. If it is mild steel it needs to be mig welded, with NO grind marks in the weld. If it's moly tubing, it has to be tig welded. Don't spend a lot of money on the car till you know what you have. Would depend on how old the cage is. I believe on mild steel, it has to be at least .140 thick minimum before it can be certified, if you choose to do so later on. I used a Jegs 12 point cage when I built my Grand Am several years ago, and it passed no problem.
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Post by sg3526 on Jan 2, 2012 18:45:13 GMT -6
Because a cage is stronger than just a roll bar. Just be sure that whom ever welds it in uses the correct method for the tubing you have. If it is mild steel it needs to be mig welded, with NO grind marks in the weld. If it's moly tubing, it has to be tig welded. Don't spend a lot of money on the car till you know what you have. Would depend on how old the cage is. I believe on mild steel, it has to be at least .140 thick minimum before it can be certified, if you choose to do so later on. I used a Jegs 12 point cage when I built my Grand Am several years ago, and it passed no problem. Actually it's .118 minimum thickness. People used to use .122 but the standard for DOM tubing is +/- 10%. So if you had 10% less than .122 that would put you at .110, to thin. So they started using .134 wall tubing which is heavier to say the least. Chromemoly tubing on the other hand is regulated and has to be the thickness that it says it is. I used .122 on my Beretta when I built it and it passed tech just fine..(metallic paint works real good at helping thin metal). On my Monte Carlo I ended up using .134 wall tubing. All glass body and a small block Chevy it weighed 2210 where the Beretta weighed 2130, same chassis same engine and trans steel roof and quarters.
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leep
Rookie
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Post by leep on Jan 4, 2012 12:59:40 GMT -6
thank you for your replys and input. this cars equipment seems to be dated. i belive will finish the upgrades i am doing and run the car at some 1/8 mile non nhra tracks that will let me in. dont think the car is worth dropping a lot of money in as far as new cage etc.. seems to be after one summer if i am really back in to racing it would be best to sell this car and get an up to date car. am 67 years old!!
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Post by 69b1dart on Jan 4, 2012 13:44:01 GMT -6
old race cars are like woman,you love them and hate to get rid of them
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Post by bracketracing on Jan 4, 2012 15:49:01 GMT -6
They are in National Dragster coverage for on or off the track. Tri-State insurance does classic car
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Post by probrd on Mar 11, 2012 17:58:41 GMT -6
NHRA has changed their mind on the new window net rule. The rule will go back to the way it was in 2011. It was amended on March 5th. No need for an SFI window net unless the car runs 7.50 or faster in the 1/4.
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