cage Ideas?
#21
One of the best collections/discussions on cage design I've seen, including X-bar/NASCAR hybrid doorbars:
http://roadraceautox.com/showthread....highlight=cage
http://roadraceautox.com/showthread....highlight=cage
#24
Yes, but boost is an automatic bump up to O. I think the cutoff is 2.0L. Also rotaries have a multiplier. When I ran my GrandAm Cup Miata with the SCCA I ran in SPU, but that was the same class World Challenge cars ran in - which were making ~100hp more than my Miata. I believe that most SP rules specify the car must be a fendered, production based car (since it is a Production class). That would keep out the formula cars and prototypes- but not things like x-stock cars, which run in the class here often.
#26
Elite Member
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
Yes, but boost is an automatic bump up to O. I think the cutoff is 2.0L. Also rotaries have a multiplier. When I ran my GrandAm Cup Miata with the SCCA I ran in SPU, but that was the same class World Challenge cars ran in - which were making ~100hp more than my Miata. I believe that most SP rules specify the car must be a fendered, production based car (since it is a Production class). That would keep out the formula cars and prototypes- but not things like x-stock cars, which run in the class here often.
Bob
#27
#28
Junior Member
Join Date: Dec 2010
Location: UK, in Cambridgeshire or wherever work takes me.
Posts: 375
Total Cats: 20
There's me knocking lightyear's bent-type door bars, when that's what's used in current WRC:
Although I still think (goddammit!) that the bend at the rear of the uppermost bar in lightyear's cage can't be good for anything except for a way to dissipate front-impact energy.
Overall though, sorry for knocking your bent bar design, when clearly it must be the best solution.
Although I still think (goddammit!) that the bend at the rear of the uppermost bar in lightyear's cage can't be good for anything except for a way to dissipate front-impact energy.
Overall though, sorry for knocking your bent bar design, when clearly it must be the best solution.
#29
There's me knocking lightyear's bent-type door bars, when that's what's used in current WRC:
Although I still think (goddammit!) that the bend at the rear of the uppermost bar in lightyear's cage can't be good for anything except for a way to dissipate front-impact energy.
Overall though, sorry for knocking your bent bar design, when clearly it must be the best solution.
Although I still think (goddammit!) that the bend at the rear of the uppermost bar in lightyear's cage can't be good for anything except for a way to dissipate front-impact energy.
Overall though, sorry for knocking your bent bar design, when clearly it must be the best solution.
#31
Junior Member
Join Date: Dec 2010
Location: UK, in Cambridgeshire or wherever work takes me.
Posts: 375
Total Cats: 20
It's funny how this newest kind of WRC cage wouldn't hold up in the US (due to the lack of a main hoop, right?) as mentioned in that thread, even though they can stand being rolled off a mountain, ha.
#34
Actually, a lot of those WRC cages are FIA-certified, which will pass in a lot of US-sanctioned organizations. The trick with that is it has to be EXACTLY to FIA specification, and may or may not need an FIA stamp (don't remember on that last bit). You see this with some imported race cars. The design isn't necessarily inferior (the lack of a main hoop I mean), just a different take. From a practical standpoint, if you're in the US stick to US-spec cages with respect to main hoop stuff.
#35
Ok, well here is what I have been thinking. I dont want to take the car off the street but the speeds I have at the track are concerning and I want to stiffen the car. I still want to get in and out of the car on a daily basis so I am thinking of having that upper door bar removable.
The thought is to cut out the seat belt towers and use that area for the hoop giving me more room for the sholder support on these style seats and letting me push the seat all the way to the rear.
The thought is to cut out the seat belt towers and use that area for the hoop giving me more room for the sholder support on these style seats and letting me push the seat all the way to the rear.
#38
X Bars are still pretty common with the TT crowd here in the Northeast. I have the Hard Dog roll bar/door bars in mine now, and they run just under the edge of my seat (RaceTech 4009W). I could live with a similar setup on the cage. Rollover protection is my top priority though, and I'll go through the X bar/mini/maxi NASCAR bar discussion with the builder. Ideal setup will have better legroom and headroom than afforded by the HDHCDD setup in there now, while adding A pillar support.
Savington - thanks for posting the earlier cage thread. Those TC Design pics will be very helpful.
I forwarded the snowboarder cage pics over to my local builder to start the process. He's done a lot of SM cages but mine will be a little different. Like the original poster in that thread, I'll still be street driving to the track for at least another year and need those photos for ammo when he wants to go all NASCAR on me.
Last edited by TimM; 10-05-2011 at 04:06 PM. Reason: typo
#39
Elite Member
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
My cage will be a bit different as I intend it to be integrated into a simi Tube frame conversion of the chassis. Not allowed in ST, IT, or Spec Miata Classes. Much of the existing structure in the Unibody will be gone. car will be prepared to the limit of the XP autocross rules to the best of my ability and I hope to be near the minimum 1760 lb limit for a boosted 2.0l while still retaining a windshield and also meeting road race rules for SPO which is basically a GT car. Problem is the only way a Miata can run in a GT class is to drop a rotory in it and it would more likely be a full tube frame.
Example GT3 miata full tube frame.
http://www.pennon.com/products/bodyw...zda/Mazda.html
Bob
Example GT3 miata full tube frame.
http://www.pennon.com/products/bodyw...zda/Mazda.html
Bob