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Author Topic:   bump steer / metric front
wingnut
Dirt Maniac

Total posts: 134
posted May 07, 2004 11:10 AM  
we thinking of putting a swage tube and one of the adapters on the right front of a metric stub car , but we have no knowledge of or access to a bump steer gauge. the adapter has little spacers that can be added or taken off. car has stock componets on the front, except for dirt works style upper ball joints. If anyone can help get us in the ball park it would be greatly appreciated, thanks for your help.

udecide66
Dirt Freak

Total posts: 229
posted May 07, 2004 11:18 AM  
I'm thinking about doing the same thing, so you could help us both.
I have a question though, if you are packing the left front tire through the straights and coming out of the turn, does bump steer really matter. your pretty much steering with the rear of the car at that point.
Maybe It's a stoopid question I don't know.

mod70
unregistered Total posts: 229
posted May 07, 2004 01:03 PM           send a private message to udecide66   Edit/Delete Message   Reply w/QuoteBBBBBB
I've just swithced my tierods over, and the easiest thing to do is to set the hiem the same distance down from the mounting arm of the spindle (don't know what that's called) as the center of a factory ball joint.
66 - If by packing you mean picking the tire up, then no, on exit the RF is doing the steering of the front of the car, and the LF is having no effect. Bump steer only comes into play when both tires are on the ground.
Oh, and there are no stupid questions here, (no stupid people either, just a little crazy) if you need to know, ask.

[This message has been edited by mod70 (edited May 07, 2004).]

udecide66
Dirt Freak

Total posts: 229
posted May 07, 2004 03:30 PM  
Yes I meant lifting the left front tire up.
I don't get my left front off the ground, but it picks it up enough there is very little weight on that corner.
I am using the stock components on my metric stub, I don't have any problems (so far) with bump steer.
A couple guys at our track use the "bump Studs" with swedge tubes, every time they get tapped on either front wheel the stud bends and messes up their steering. That's why I don't like the idea.
I know people are using 5/8 bolts instead for this reason.

nolimit92
Dirt Forum Racer

Total posts: 97
posted May 07, 2004 09:06 PM  
Definately ONLY USE THE 5/8 Bolts with 5/8 ID spacers. I have ran this set up for 2 years and have smacked the wall a few times. The bolts are far stronger then anything. Just make sure to run grade 5 bolts and not 8 so if you do get hit they bend and not brake. The way we have done it is have the swedge tubes even with the lower A-Frames. I use a 2 inch on the RF and a 1 3/4 on the LF but I run Pinto front.
Not sure if this is the best way but It works for us.

Mike
No Limit Racing

udecide66
Dirt Freak

Total posts: 229
posted May 18, 2004 05:54 PM  
I bought everything to change my car over to tubes and heims for outer tie rod except for the 5/8 bolts, How long of bolt should I get, I measured it out with a 2 inch spacer and it seems it needs to be about 5-5 1/2 inch bolt.
This seems a little long, how long are yours?
Thanks for the help.

Dustejr73
Dirt Maniac

Total posts: 177
posted May 18, 2004 06:57 PM  
the bump steer adapters are pieces of junk. i ran them on my mod for a while with pinto spindles until i got tired of breaking them. i drilled out my spindles then welded the nut to the spindle arm to keep the slop out, as far as bump steer on a dirt car i basically put my components on the same plain with spacers.

udecide66
Dirt Freak

Total posts: 229
posted May 18, 2004 08:09 PM  
I know the bump stud adaptors are junk, I am going to drill out my spindle and use a 5/8" bolt but how long do I need?
and How long is too long, 5" 6" or what?
What lenght of bolt is everyone using?

I am not so interested in getting the bump steer correct, I am more interested in just lowering my outer tie rod, because when my car rolls over the tie rod is rubbing my frame causing it too bind.

mod70
unregistered Total posts: 229
posted May 18, 2004 08:41 PM           send a private message to udecide66   Edit/Delete Message   Reply w/QuoteBBBBBB
I've got 3" 5/8ths bolts in mine and I'm using 3 G8 locking washers as spacers. I don't think you'd need more than 3.5" bolts.

jws
Dirt Maniac

Total posts: 115
posted May 19, 2004 08:18 AM  
Every chasis is different as to how far you need to space the heim joint fromt the steering arm. It's not real critical on dirt cars. Most that I've seen are about .5 to 1" of spacer. If you have clearance problems on the frame you can heat the spot that's hitting and beat it in with a hammer if it's only minor interference.

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