AxeHealey
AxeHealey GRM+ Memberand Dork
7/22/21 7:50 a.m.

I'm wanting to build this new-to-me, mostly caged Miata into a car that fits anywhere I'd want to run it in terms of the cage. I'm trying to determine which of the organizations I may run with have the most strict cage requirements so I can build to that spec.

Where I see myself using the car; 

  • Definitely
    • ChampCar
    • Lemons
    • AER
    • SCCA
  • Maybe
    • NASA
    • Vintage - I actually don't know what year the Miata is at this point

From experience, I think ChampCar and Lemons are typically more strict (at least their tech inspection is) than  SCCA but my experience with SCCA road racing is limited. 

I'm planning to print out the cage regs for all of the above and study them but thought the massive amount of knowledge here may be able to lead me in the right direction. 

I suppose it's also necessary to note that I expect to keep the full windshield and a hardtop on the Miata - that is, no F-Prod type cage.

BMWGeoff
BMWGeoff New Reader
7/22/21 8:01 a.m.

I'm curious to hear the results of this research as well. I've just purchased a race car that may need some cage updates, depending on the series.

Streetwiseguy
Streetwiseguy MegaDork
7/22/21 8:02 a.m.

I would think you would be good building to SCCA spec as a baseline.  An Improved Touring cage covers most everyone, as long as you include the optional dash bar.  I like nascar door bars, which make interior room so much better, but cutting the interior panel of the door could cause a bit of consternation for some groups.  Tube size and thickness is pretty standard for most groups, except NHRA, and that doesn't matter unless you are figuring on running 11.50's or better.  1.5" .120" wall is overkill for pretty much every ruleset I've read, again other than NHRA that wants 1 5/8, 120.

Read through the various rules, start with a baseline, and add features that may be required by other bodies.  If you build a good, clean cage to that spec or close to it, you should be fine.  I guess I should remind that SCCA IT rules limit you to 8 mounting points and also limit the footprint size of the mounting plates to limit "accidental" stiffening of the chassis.

vwcorvette (Forum Supporter)
vwcorvette (Forum Supporter) GRM+ Memberand UltraDork
7/22/21 8:34 a.m.

Check the Hillclimb regs at NEHA.

Kendall_Jones
Kendall_Jones HalfDork
7/22/21 9:01 a.m.

I have a caged miata chassis (that I've been trying to sell forever) with a miatacage.com cage in it.  One of the things I found was that the 095 wall used in my cage was NOT good for lemons, they need a .120 wall.  I didn't check other sanctioning bodies but thats as far as I got.

AxeHealey
AxeHealey GRM+ Memberand Dork
7/22/21 10:38 a.m.

Streetwiseguy - Good tips, thanks. And I think you're probably right that an SCCA cage would fit most. For instance I looked earlier this morning and AER just specifies that the cage should be built to SCCA/NASA and the like standards. No actual definition that I saw. This car has what was, at some point, a NASA Spec Miata cage so it should be a good start.

 

vwcorvette - Hillclimb spec is also a good suggestion. I bet those are rather stringent.

 

Kendall_Jones - I noticed that about Lemons this morning while looking around. I'm guessing they almost never check that, however, since the car we run was also a Spec NASA car back in the day and it almost certainly has .095 wall tubing in it. 

frenchyd
frenchyd UltimaDork
7/22/21 12:11 p.m.
Kendall_Jones said:

I have a caged miata chassis (that I've been trying to sell forever) with a miatacage.com cage in it.  One of the things I found was that the 095 wall used in my cage was NOT good for lemons, they need a .120 wall.  I didn't check other sanctioning bodies but thats as far as I got.

.095 Chrome Moly is usually a substitute for  .120 DOM with all organizations. 

buzzboy
buzzboy Dork
7/22/21 12:35 p.m.

Lemons does not allow Chrome Moly tubing, period.

Chump will penalize you for overbuilding a cage.

Lucky Dog adds a the requirement of a dashbar to what Lemons requires.

It's pretty easy to build a cage that fits all three of those organizations. I have no SCCA experience so I can't speak to that.

trigun7469
trigun7469 SuperDork
7/22/21 1:15 p.m.

I think this one checks all the boxes 

Tom1200
Tom1200 SuperDork
7/22/21 2:22 p.m.

I have an Autpower 1.75 / .120 kit they we simply added to as SCCA updated the regs. It's total overkill but I'm OK with it.

I've run my car with SCCA, NASA and vintage.......everyone accepted it.

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