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Author Topic:   Adding Cross to the car when building frame
Dirt Maniac

Total posts: 165
posted March 18, 2005 11:43 AM  
HEy again. I trahed my car last week at practice so I am cutting everything out and starting over. I read somewhere in a racing magizine that I could add cross to the car when I weld the cage into it. It said somehthing like weld all the tubes from the cage except for the RF tube then take a come-along and pull the frame up to the tube then weld. Does this work? Should I do it and if it does work, how much do i need to pull it up. Im planning on tomorrow to get the cage into the new car. Thanks

Dirt Freak

Total posts: 428
posted March 18, 2005 12:56 PM  
I know this method works, seen a guy do it once, but I don't know how much he pulled it up.

Dirt Maniac

Total posts: 165
posted March 18, 2005 01:07 PM  
Well, I guess I will try it but Im only gonna pull it up about an inch. So to make this clear. Im gonna pull the RF frame up to the bottom of the cage to put a small counter-clockwise twist into the car.

unregistered Total posts: 165
posted March 18, 2005 01:18 PM           send a private message to Raceman17   Edit/Delete Message   Reply w/QuoteBBBBBB
no you got it backwards.

if its level on jackstands.

jack up the left front 1-2 inches.

you could just put a 2x4 on the lf jackstand if youve got them out at the ends. you may have to add wt on the other corners to keep it down until you get enough cage done to hold it.

whatever you do make sure its something you can measure so you can duplicate it for your next car if it works out!!!

cross wt is wt on the rf and lr.

Dirt Maniac

Total posts: 130
posted March 18, 2005 02:43 PM  
Exactly what my buddy says to do.

Dirt Forum Champ
Total posts: 5390
posted March 18, 2005 04:19 PM  
it does work but I always pull the lr and rf down it seems easier to pull down then to push up...

Dirt Freak

Total posts: 333
posted March 19, 2005 08:13 PM  
Oh, BOY. Do what you gotta do,...This trick is very old school people,...same as shortening the left frame rail by an inch. Good luck if these tricks don't work at your track, or at another that you might race at, say different size and banking? Man oh man, but I shiver at the thought of doing this stuff,...

I say no more. Sorry. Race on.

if it ain't fun, then don't run

Dirt Freak

Total posts: 295
posted March 20, 2005 06:59 PM  
Yes I did build a project car with twist in the frame. I jacked up the left front about an 1 1/2". Now here is why. No bars were allowed through the firewall making the front frame area very flimsy. The local rules required (and they checked) both front springs to be the same height. The rears had to be a match also. Tolerance was on the order of less than 1/4". No weight jacks were allowed. Only track tires could be used. Size variation was no more than 1 1/2" roll out. A stock OEM small diameter sway bar could be used but it had to use stock non adjustable attachment hardware. All told the only way to legally increase static cross weight was to build twist into the car.
If tire sizes allow weight adjustment or if weight jacks can be used that is surely a better way to do the job. As long as adjustments are allowed build the frame level. SLEEPY

Dirt Full Roller

Total posts: 36
posted March 23, 2005 09:01 PM  
Just a question, but if you add too much cross by doing this and you cannot adjust anything is why you did it, how do you take it back out?

Dirt Freak

Total posts: 295
posted March 24, 2005 06:48 AM  
It is just a guess as to how much to put in. I have done this with flimsy front ends (no bars through the firewall) and twisted the frame using a long piece of 2" pipe at the front bumper mounts about 1 1/2". How much should you use? Only building several cars will tell you. There is a way to take it out or maybe add more. Cut the cage loose at the front corners from the chassis. Then re twist the frame. If you do this be absolutely certain that the cage is re welded correctly, say with several large triangle braces. It is a lot of work but it can be done.
Remember this is not a recommended way to build a car if some other way exist to set cross weight. However...... SLEEPY

Dirt Roller

Total posts: 21
posted March 24, 2005 08:52 PM  
at are track you can't use jack bolts so we put cross in the car by jacking up the r/f 1 1/2in what a difference it made

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