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Author Topic:   J-bar?
showtime13
Dirt Full Roller

Total posts: 60
posted September 18, 2005 07:43 PM  
Under what conditions should I raise or lower my j-bar?

rocket36
Dirt Freak

Total posts: 209
posted September 18, 2005 08:15 PM  
more angle = more side bite
car is tight = raise on pinion or lower on frame.
car is loose = lower on pinion or raise on frame.

if the track is rough, you may prefer to keep the bar at a minimal angle and instead just raise or lower both ends of the bar equally which will just effect roll centre.

any adjustment on the pinion will have a more noticable effect than an equal adjustment on the frame.

showtime13
Dirt Full Roller

Total posts: 60
posted September 19, 2005 03:32 PM  
Is it important to keep the rear end centered?

rocket36
Dirt Freak

Total posts: 209
posted September 19, 2005 08:11 PM  
i'm not sure about centered?? hopefully your chassis manufacturer has or can give you a side-to-side measurement for your rear end location. but i guess without that information, centered would be a good place to start. all your 4 bar rods should point slightly toward the centre of the car at the chassis.
to answer your question, yes, it is VERY important to adjust your j-bar length to maintain the correct rear end location.
i would highly recommend the investment in purchasing a turnbuckle style j-bar to make adjusting the j-bar's length much easier (you don't have to remove it from one end every time you change it). we use an aluminum one from weirs machine but afco, twm and others also make similar j-bars in aluminum and steel.

showtime13
Dirt Full Roller

Total posts: 60
posted September 20, 2005 04:48 PM  
Could you send me the web site that sells these plz. Im really interested in this J-bar you have

rocket36
Dirt Freak

Total posts: 209
posted September 21, 2005 03:02 AM  
sorry, bad spelling mistake. should have been "wehrs machine".
web site is www.wehrsmachine.com

a very satisfied customer here.

NJantz
Dirt Forum Champ
Total posts: 755
posted September 21, 2005 09:02 AM  
How does the Wehr's alum. jbar hold up to impact? I always worried about them breaking where as the steel one usually just gets bent.

rocket36
Dirt Freak

Total posts: 209
posted September 21, 2005 03:37 PM  
we've taken a couple of really big knocks and haven't had a problem.
the only part we've ever bent is the actual steel turnbuckle part that screws into the j-bar & heim. and that only got damaged when we had a uni joint fail, tail shaft come out, get jammed in lift arm, breaking lift arm bracket off diff housing allowing the whole diff housing to rotate around. the only thing that stopped the diff from turn a full 360 deg was the j-bar.

so i certainly can't fault their product, and they make life so much **** easier when your making adjustments.

Ego Racing
Dirt Forum Champ
Total posts: 724
posted September 26, 2005 01:43 PM  
We run an anlmunum one and broke it in a wreck, the only one we could get was a steel one. During the feature we got sent to the wall sideways comming out of the turn and continued. The driver said it felt softer than the original hit. When we got back tot he shop monday to clean the car we found the Pinion mount was bent(it was from this hit as the bolt would not come out if it), the frame mount was bent (this was not the original one as we removed the original with the broken bar), and the frame mount was bent along with the panhard bar.
The first hit cost us $130 for the panhard bar.
The second hit was a $50 frame mount, a $130 panhard bar, a $130 pinoin mount and the panhard mounting tube and all of the time to jig it and cut and replace it.
I would rather just replace a J-bar than everything else.

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