Dyno sheet request
01-30-2009, 05:59 PM
#46
Rennlist Member
If you do CM, then you might only have to do 1.5" diameter, but with SCCA, they have a 1.75" rule, so you might have a problem with scca. I would just go DOM as it will be a lot cheaper to build.
Here is the 90lb cage scot welded into his car from my old 84 racer. It was a pretty crummy design and had some errors, but heck at the time, i didnt know what the heck made a good cage. It was kind of cool for a dual purpose street car, as the door bars were both removable, and both would then meet the two side bar requirements of pro and some club racing orgs. Now, not only was the tubing too thick, the side bars had a bad design, and diagnol bar needed to be a contiguous piece, not cut in two with the horizontal one sold bar.
Point, is, its a minimal cage and is around 90lbs, could be more like 80 with the 1.75x .095" tubing.
mk
Here is the 90lb cage scot welded into his car from my old 84 racer. It was a pretty crummy design and had some errors, but heck at the time, i didnt know what the heck made a good cage. It was kind of cool for a dual purpose street car, as the door bars were both removable, and both would then meet the two side bar requirements of pro and some club racing orgs. Now, not only was the tubing too thick, the side bars had a bad design, and diagnol bar needed to be a contiguous piece, not cut in two with the horizontal one sold bar.
Point, is, its a minimal cage and is around 90lbs, could be more like 80 with the 1.75x .095" tubing.mk
I just picked up the car that will be my race car chassis. It's a non-sunroof early car. I already have the lightweight starter too. 16V is about 20lbs lighter than 32V. Scot's cage is really only 90lbs? I was told that a 944Cup cage is 145lbs including the plates in mild steel. Mine will be 1.75x.095 and I'm considering CM. Whatever the material, I'll probably have a professional TIG it.
01-30-2009, 06:46 PM
#47
Race Director
If you do CM, then you might only have to do 1.5" diameter, but with SCCA, they have a 1.75" rule, so you might have a problem with scca. I would just go DOM as it will be a lot cheaper to build.
Here is the 90lb cage scot welded into his car from my old 84 racer. It was a pretty crummy design and had some errors, but heck at the time, i didnt know what the heck made a good cage. It was kind of cool for a dual purpose street car, as the door bars were both removable, and both would then meet the two side bar requirements of pro and some club racing orgs. Now, not only was the tubing too thick, the side bars had a bad design, and diagnol bar needed to be a contiguous piece, not cut in two with the horizontal one sold bar. Point, is, its a minimal cage and is around 90lbs, could be more like 80 with the 1.75x .095" tubing.
mk
Here is the 90lb cage scot welded into his car from my old 84 racer. It was a pretty crummy design and had some errors, but heck at the time, i didnt know what the heck made a good cage. It was kind of cool for a dual purpose street car, as the door bars were both removable, and both would then meet the two side bar requirements of pro and some club racing orgs. Now, not only was the tubing too thick, the side bars had a bad design, and diagnol bar needed to be a contiguous piece, not cut in two with the horizontal one sold bar.
Point, is, its a minimal cage and is around 90lbs, could be more like 80 with the 1.75x .095" tubing.mk
01-30-2009, 06:54 PM
#48
Rennlist Member
we had to cut the roll bar from the front sections. it was a hassle, but compared to starting from scratch, it was a good deal for him. I think in the end, it cost him about $700 to get it in his car, with someone doing all the work
mk
mk
01-31-2009, 04:06 PM
#49
Race Director
Thats cheap for a full cage......mine is at about $700 right now with only the back half....but I do think the front 1/2 will be cheaper...
01-31-2009, 07:15 PM
#50
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Mark, I think I need 1.75" for NASA, but that may only be if I want extra bends or go over 3000lbs race weight. That's not bad. I think the 90% done Piper Motorsports cage in one of my Mustangs is around $2500. My friends who have done their own cages say $700-900 for costs, but they have lots of leftovers.
01-31-2009, 08:58 PM
#51
Race Director
Mark, I think I need 1.75" for NASA, but that may only be if I want extra bends or go over 3000lbs race weight. That's not bad. I think the 90% done Piper Motorsports cage in one of my Mustangs is around $2500. My friends who have done their own cages say $700-900 for costs, but they have lots of leftovers.
Your right about NASA being a bit more strict on cages than SCCA...this is the reason we went with .120 DOM for my cage...to be 100% sure it would pass tech and allow to add some weight into the car later on (cool suit etc) and still pass
My cage was $600 labor with $145 in parts or $745..... I was originally quoted $1500-2000 for a completed 8 point cage out of 1.75x.120 DOM.....estimated at about 50 feet of tube....
01-31-2009, 10:40 PM
#52
Rennlist Member
you got a good deal on the cage. mine was a good deal on the holbert car, around 1300 bucks, but the cage scot is using was done by a speedshop and it ended up costing $2000 with the removable door bars I needed.
Scots was $700 for only taking my cage (which he gave me $150 bucks for) and getting it installed.
NASA is much more lax on cages than SCCA. SCCA says 1.75" no exceptions for the main hoop and bars. the supporting bars can be 1.5". PCA and I think NASA also has a limit of 1.5" tubing if you are going to weigh less than 2500lbs, SCCA doesnt allow this. PCA does. No one requires .120 tubing. .095 is the standard for almost all racing associations. (1.75" diameter)
mk
Scots was $700 for only taking my cage (which he gave me $150 bucks for) and getting it installed.
NASA is much more lax on cages than SCCA. SCCA says 1.75" no exceptions for the main hoop and bars. the supporting bars can be 1.5". PCA and I think NASA also has a limit of 1.5" tubing if you are going to weigh less than 2500lbs, SCCA doesnt allow this. PCA does. No one requires .120 tubing. .095 is the standard for almost all racing associations. (1.75" diameter)
mk
02-01-2009, 01:32 AM
#53
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NASA's rules:
Up to 1500 lbs.
1.375” x 0.095” Chrome-moly / Seamless mild steel (DOM)
1501 - 2500 lbs.
1.500” x 0.095” Chrome-moly / Seamless mild steel (DOM)
1.500” x 0.120” ERW* (No issuance of log books for cars with ERW cages 04/30/03)
*Note- Specifications listed for reference for inspection of grandfathered vehicles.
63
2501 - 3000 lbs.
1.500” x 0.120” Chrome-moly / Seamless mild steel (DOM)
1.750” x 0.095” Chrome-moly / Seamless mild steel (DOM)
1.750” x 0.120” ERW* (No issuance of log books for cars with ERW cages 04/30/03)
*Note- Specifications listed for reference for inspection of grandfathered vehicles.
3001 - 4000 lbs.
1.750” x .120” Chrome-moly / Seamless mild steel (DOM)
No ERW allowed.
Over 4000 lbs.
2.000” x 0.120” Chrome-moly/Seamless mild steel (DOM)
No ERW allowed.
Up to 1500 lbs.
1.375” x 0.095” Chrome-moly / Seamless mild steel (DOM)
1501 - 2500 lbs.
1.500” x 0.095” Chrome-moly / Seamless mild steel (DOM)
1.500” x 0.120” ERW* (No issuance of log books for cars with ERW cages 04/30/03)
*Note- Specifications listed for reference for inspection of grandfathered vehicles.
63
2501 - 3000 lbs.
1.500” x 0.120” Chrome-moly / Seamless mild steel (DOM)
1.750” x 0.095” Chrome-moly / Seamless mild steel (DOM)
1.750” x 0.120” ERW* (No issuance of log books for cars with ERW cages 04/30/03)
*Note- Specifications listed for reference for inspection of grandfathered vehicles.
3001 - 4000 lbs.
1.750” x .120” Chrome-moly / Seamless mild steel (DOM)
No ERW allowed.
Over 4000 lbs.
2.000” x 0.120” Chrome-moly/Seamless mild steel (DOM)
No ERW allowed.
