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PostPosted: Tue Dec 12, 2017 10:48 am 
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This is directed to Greg and to those who could approve a technical bulletin in regards to a safety item.

I would like to propose to add a technical bullet for the 2018 PTE/TTE & TTF/PTF rules, allowing:
Reinforcement of suspension mounting locations on OEM frame rails, Sub-frames/suspension cross-members, and unibody is permitted provided there is no performance benefit or relocation of the mounting points

This is already a rule in ST5/TT5 on 6.1.3 2)1g):
Image


Also in NASA Spec Miata 2017 rules:
Image


If no sub-frame reinforcements are in place, this can happen
Image
This is from my TTE car and the failure happened at Road Atlanta in December 2017. I've tracked the car for about three years and did not know of this issue. I later found out about this issue in SM and the rule exception they have written in for the reinforcement plates as a safety measure.


The reinforcement plates, Mazda Part #0000-04-5989, are $17.70 and do not provide a performance benefit and is purely a safety measure.

I appreciate everyone's consideration on this.

Thanks!

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PostPosted: Tue Dec 12, 2017 11:10 am 
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I support any measure which makes this sport even marginally safer. If it has the added benefit of keeping costs down, then all the better. If this is something already considered and adopted by SM and TT5/ST5, I see no problem with allowing it for the remainder of the tenure for TTE/PTE.

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PostPosted: Tue Dec 12, 2017 11:11 am 
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I would like to see this approved.
Bob Manker
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PostPosted: Tue Dec 12, 2017 11:49 am 
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I think you currently can do this, but it will cost some points.

Are you asking this be a free mod for the MX5 only,or across the board? While on your car it may not be a performance enhancement, on other cars a tortured version of it could provide a benefit.

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PostPosted: Tue Dec 12, 2017 12:06 pm 
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Ev wrote:
I think you currently can do this, but it will cost some points.

Are you asking this be a free mod for the MX5 only,or across the board? While on your car it may not be a performance enhancement, on other cars a tortured version of it could provide a benefit.


Across the board, double check the picture of the ST5/TT5 rules I put up. I would think it would be easiest to be written similar to how it is in the ST5/TT5 rules. Which states "...provided there is no performance benefit or relocation of the mounting points."

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PostPosted: Tue Dec 12, 2017 12:11 pm 
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As long as this modification will not take a modifier when the ST6 rules are released I'm on board.


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PostPosted: Tue Dec 12, 2017 1:04 pm 
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A big +1 from me. This is a safety issue not a performance advantage. It seems silly that one can weld a torn seam back together but can't reinforce the joint to prevent a failure. And as @JamesMilko commented this needs to follow to st6.

Aaron


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PostPosted: Tue Dec 12, 2017 3:21 pm 
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If it's already allowed in ST5 and ST4, is a safety item for that specific problem, doesn't provide a performance benefit, and is also a specific part that you can order from Mazda themselves and specify in the rulebook, I think it would be dumb not to add this to the no points modification section of TT/PT.


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PostPosted: Tue Dec 12, 2017 3:42 pm 
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So did OP or anyone else actually write an email to GregG asking about this?

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PostPosted: Tue Dec 12, 2017 3:47 pm 
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flier129 wrote:
Ev wrote:
I think you currently can do this, but it will cost some points.

Are you asking this be a free mod for the MX5 only,or across the board? While on your car it may not be a performance enhancement, on other cars a tortured version of it could provide a benefit.


Across the board, double check the picture of the ST5/TT5 rules I put up. I would think it would be easiest to be written similar to how it is in the ST5/TT5 rules. Which states "...provided there is no performance benefit or relocation of the mounting points."

Who's in charge of proving a mod does or doesn't "improve performance"?

I think this has come up before with regard to the E36 BMW chassis, and the determination was "warts and all". But I can't find it. The search continues...

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