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upper sub-frame connectors legal for tt? most g's seen?


Dawg

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are upper sub-frame connectors legal in ttu? i've got an 2003 mustang cobra and you have to cut into the floor pan above where a lower sub-frame connector would go and and put in the upper and weld in place and weld to the rear section of the body. these are used in world challenge cars.

also what is the most g's seen in a mustang? is 1.4 g's out of the question at like an autocross event?

would appreciate your responses! thanks!

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man that was fast! if you drive as fast as you answer posts you must be pretty good!

was just reading the rules earlier and it was talking about the difference between ttu and ttr and it stated something about keeping the original floor pan and said something about" partial" or all tube frame would be basically ttr. was just figuring that the upper sub-frames would be both.

what about the g's questions?

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Pretty sure that you have to "retain" the stock floor pan to stay out of TTU or TTR. There was a thread where a guy welded a bar between the lower ends of the main hoop. He went straight through the tranny tunnel hump and then welded back around it. I'm 90% sure it was illegal because he modified the stock floor.

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  • National Staff
BINGO!!!!!!!!!!!!!!!!!

That's what I did. did i flub up for the TTU class???????????????????

 

Yep, I think you might have. The modification is legal in AI under a special provision in the AI Rules. I have taken this one "upstairs", and so far, the concensus is that this type of modification is too much of a "slippery slope" to allow. This is not my final ruling.....yet. I'll keep you posted here.

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  • 2 months later...
  • National Staff

Floorpan modifications to include items such as subframe connectors, roll cage bracing, and fuel cell placement may be approved on a case-by-case basis by the National TT (or ST) Director. Such modifications will be subject to approval and possible modification factor assessments.

 

I am going to assign a -0.2 modification factor to these "upper subframe" modifications (as shown in the photos linked) through the floorpan in Mustangs.

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