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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 11-15-2005, 10:35 AM   #41
Mr Paddle.Shift
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Originally Posted by Hamann bmw
This is it i wanna track run this car.
Cool. So we are off to Big Willow tomorrow. Care to join?
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Old 11-15-2005, 03:04 PM   #42
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Cage installation prices all depend on what you want. I wanted a cage that did more than just protect you in a crash.
This pic shows you part of the front of the cage and what we had to do for the drivers door.

This next pic shows how I had the cage tie into all 4 subframe pickup points (the tubes reach all the way down to the welded in nut plates) and rear shock towers. Also, the cage builder tig welded 100% of each joint. This is not an easy task and does cost extra. It is not easy to tig the top of every joint when it is closest to the roof. He just pre built the main cage, cut out the floor pickup points, lowered the cage, welded everywhere his welder couldn't reach, raised the cage back in the car and then welded the floor back up with extra reinforcement plates.


This is an extensive cage but it does what it was designed to do. I just used tape and string to trace out where each tube was supposed to go. He followed it to a tee. The cost was around $5k per car.

A bit off topic, here is a pic with my 3yr old son giving my dog a ride of her life.
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Old 11-15-2005, 03:06 PM   #43
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Are you adopting ?
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Old 11-15-2005, 03:09 PM   #44
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Judging from the A pillar reinforcements, Looks like you are working with a BMW Motorsport chassis? That's one heck of a cage there. looks pretty sweet. What was the weight of the car after you were finished with that?
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Old 11-15-2005, 03:17 PM   #45
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I think most people on this thread are mixing up a "roll bar" with a cage. You can get a bolt in roll bar cheap and have it welded in cheap also. For what most people are doing this should be just fine (DE, track days, etc.). For people who are going racing then 2-6K is not out of line at all. Anyone saying it is too much really has no idea what they are talking about or are talking about something else.

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Old 11-15-2005, 03:19 PM   #46
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Originally Posted by tim330i
I think most people on this thread are mixing up a "roll bar" with a cage. You can get a bolt in roll bar cheap and have it welded in cheap also. For what most people are doing this should be just fine (DE, track days, etc.). For people who are going racing then 2-6K is not out of line at all. Anyone saying it is too much really has no idea what they are talking about or are talking about something else.

Tim
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Old 11-15-2005, 03:21 PM   #47
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Originally Posted by Bim Growl
Judging from the A pillar reinforcements, Looks like you are working with a BMW Motorsport chassis? That's one heck of a cage there. looks pretty sweet. What was the weight of the car after you were finished with that?
Ive seen a couple of cars like that that are not motorsport chassis but have the same A pillar bar. Its something that a good cage builder should be able to do.
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Old 11-15-2005, 04:41 PM   #48
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Quote:
Originally Posted by Bim Growl
Judging from the A pillar reinforcements, Looks like you are working with a BMW Motorsport chassis? That's one heck of a cage there. looks pretty sweet. What was the weight of the car after you were finished with that?
its actually not, i thought it was to at first but mr. shelly corrected me. a place called Victory Racing Chassis did the cage. its the conolly motorpsorts car. heres a pic of the car:

http://www.grandamerican.com/CONTENT...cupS800-05.jpg
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Old 11-15-2005, 06:00 PM   #49
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Originally Posted by YellowBird330
Get the Autopower rollcage, then take it to T&T on Reseda, THEY CHARGED MY FRIEND $300 CASH TO FULLY WELD IN HIS 10 PT AUTOPOWER ROLLCAGE, NOT $2-3K.

How thick was the PVC piping??
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Old 11-16-2005, 12:13 AM   #50
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Cool. So we are off to Big Willow tomorrow. Care to join?
Trust me i will be there every week once the car is done. still under construction.

Thanks once it done i let u know
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Old 11-16-2005, 01:59 PM   #51
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Quote:
Originally Posted by YellowBird330
Get the Autopower rollcage, then take it to T&T on Reseda, THEY CHARGED MY FRIEND $300 CASH TO FULLY WELD IN HIS 10 PT AUTOPOWER ROLLCAGE, NOT $2-3K.
Can everyone read what he is saying. It cost $300 for the welding, not the cage. It was probably another 1k or more for the cage (I don't care to look it up). What everyone else is talking about includes the cage itself and all labor to weld it together. Again it is an issue with people not understanding (apples to oranges) and people not reading what others are saying.

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Old 11-16-2005, 02:38 PM   #52
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my suggestions:

if your end goal for this car is to be a wheel to wheel racecar, and you want to go that route as of now take it someplace and get a full custom made rollcage welded in. IMO a pre fabed rollcage is primarily good for HPDE's and lapping days, not w2w racing. This is my opinion though and id rather spend a few extra grand for my safety.

if you plan on doing hpde's and lapping days for a few years id go with either a pre fabed bolt in rollbar or personally if i did this again id just get a custom welded in rollbar installed.

it all boils down to what your plans are for the future, if i have any good advice to give its this: if you plan on actually racing down the road, just learn how to drive your car as is right now and when you feel the time is right to make the transition buy an already built car. If i had sold my 323 and took the money ive spent on it now i could have a nice e36 dm or cm car already built and sorted.
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Old 11-16-2005, 03:43 PM   #53
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Its pretty much always cheaper to buy a used race car. But someone on bf.c said that when you build your own car you figure out howeverything works which can save on shop costs down the road which I find somewhat true.
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Old 11-16-2005, 06:04 PM   #54
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Steet cars don't need cages. Track cars need cages. The make the car very difficult to get in and out of. Also, don't expect any one to want to ride with you. They are a neccesary pain in the ass on the track. Why anyone would ever want one on the street beats me.
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Old 11-16-2005, 06:06 PM   #55
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this car is intened to take to the track/race car. i would like to take it out on the streets some times. i am scared of my own reckless driveing thats why i want to install one. but everything is in the works on this car from engine to supension.
If you need a roll cage on the street because you're scared of your own reckless driving, perhaps you should ride the bus.
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Old 11-16-2005, 09:24 PM   #56
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As was posted earlier, the car does not have a motorsport chassis. i have seen plenty of them and worked on improving it a bit.

On the contrary, I will be working with two motorsport chassis M3's for 2006. As the year goes on, they just might change.

Here's one of the cars:
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Old 11-16-2005, 09:26 PM   #57
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Quote:
Originally Posted by mrshelley
As was posted earlier, the car does not have a motorsport chassis. i have seen plenty of them and worked on improving it a bit.

On the contrary, I will be working with two motorsport chassis M3's for 2006. As the year goes on, they just might change.
What will you change? How is your custom built cage different than a M chassis? More Rigid? Safer? Lighter?
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Old 11-16-2005, 09:29 PM   #58
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Mpact Motorsports new E46 motorsport chassis

http://forums.bimmerforums.com/forum...d.php?t=442638
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Old 11-16-2005, 09:41 PM   #59
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I'll be getting a spare Motorsport chassis (in case we write one off) but I'll be looking into running a few tubes all the way to the nut plates in the chassis that attach the subframe.
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