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Author Topic:   shorty bar length?
badfastjr
Dirt Maniac

Total posts: 193
posted February 16, 2005 09:43 AM  
My car is a long wheelbase three link, I had a bad problem with car on rough tracks or somewhat tacky tracks,
the car would get very tight in the middle of the corner on tacky tracks, and it would bounce around all over on rough tracks,
my shorty bar is only about 8 inches center to center, would a j-bar help the car turn better on the gas, and would it help on the rough tracks? If not what would you guys suggest, I really dont want to run a bar behind the rearend.

[This message has been edited by badfastjr (edited February 16, 2005).]

zeroracing
Dirt Forum Champ
Total posts: 1875
posted February 16, 2005 10:40 AM  
to calm the car down go with a j bar, or have you tried raising the short bar and leveling it? i ran mine in the top hole and almost level before on super rough and it was great, super easy to turn and drive through holes easy. another idea is a j bar from the left of rearend to right frame, if you can mount it somewhere on the right.

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted February 16, 2005 11:50 AM  
Last year I ran a short bar, 11". Raced on fairly smooth tracks. I race a rough track and with the short bar, it was like riding a bull. For the mains, I went to a long bar behind and it drove great, really smoothed it out. I would think a j-bar would be a lot better then the short bar.

badfastjr
Dirt Maniac

Total posts: 193
posted February 16, 2005 12:02 PM  
hey zero explain to me how mounting it on the right side works......I know this is commonly an asphault deal but i can see how if it makes a car smooth for asphault it might work on dirt when its real slick. what kind of angle and what height would you run it at?

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted February 16, 2005 12:16 PM  
We ran a 10.5" bar last year and once we leveled it out never had any problems. An 8" bar is really prob too short. Honestly I dont really like the 10" bar we have either. With 8" I wouldnt run more than 1 1/2-2" split in the heims. The longer bars will have a tendency to be less radical and react slower, making the car feel smoother. On a rough or tacky track a jbar prob doesnt lose anything over a short bar on dry slick i think its a different story. We tried both last year on the same night and didnt really notice a lot of difference on entry but the short bar helped fwd bite on exit a lot.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted February 16, 2005 12:23 PM  
Hey man,
some newer late models are on the j bar to right side of frame, also older racemart cars, and many others.
The first mod i drove was a racemart with a long behind right side frame mount modified. the car was slughish in medium tracks, but on rough was almost unbeatable, drive thru a ditch and not realize it. on slick it did pretty good, no hike up at all.
the car was level all the time. i think that now with newer 4 link cars the right side mount bar will not be very good to run alot. but on rough a right side mount will be very hard to beat, also in super heavy tracks should be hard to beat. my next car will have a right side mount one for rough tracks.
the right side mount may also have potential on a "rubbered down" racetrack, where you can have the car so hooked up and hiked up you can not hardly drive it.
as far as the asphault vs dirt, the asphault have a much larger coe. of friction with the surface than a slick dirt track does, so that also comes into play, like i said when the track gets rubbered the coe goes way up so then again the rr mount may have potential.
call randys racemart for some help with the right mounted panhrad bar, my old racemart i had came with it, and many other racemarts i have seen came with them.

badfastjr
Dirt Maniac

Total posts: 193
posted February 16, 2005 12:30 PM  
i had about 4 inches of rake and had the pinion side in the bottom hole........I think 8 in. is too short too, but thats what i had to have to get the left and right sides lined up like i wanted it,

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted February 16, 2005 12:43 PM  
First of all try taking some angle out like I said in my previous post. That will help calm it down and prob free it up some from middle off. I wouldnt be afraid of trying that short of a bar dang near level if I had too.

Next what kind of frame mount do you have? Is it a slide bracket and square tube? or plates with a thru bolt? IF you have the slider bracket and it is double sided can you move that end of the bar to the outside, should gain you about 3-4" in length as long as it clears your trailing arms and springs etc.

Also if you leave your rearend where it is and go to a j bar you will prob only gain 6" or so in length center to center. Giving you a 14" bar. That would prob be petty good for you, it would be in between an average 20" jbar and the short bar.

Just something to think about.

badfastjr
Dirt Maniac

Total posts: 193
posted February 16, 2005 01:21 PM  
i have a round tube slider bracket......It wont clear the srping as its mounted to the front of the rearend. I am starting to think that the jbar may be the way to go on this, but on a dryslick track how much side bite will i lose, ive never had any trouble with bite, as this car is a 112 wheelbase and has a ton of rear percent. only problem ive ever had is gttin it to turn in the middle.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted February 16, 2005 01:31 PM  
I dont know that you will lose that much sidebite. Like I said the night we tried both j bar and shorty bar the biggest difference we noticed was on exit, and it was dry that night as well. Also theoretically a jbar or even long bar mounted closer to the RR should give you more sidebite because you are loading the rear end closer to that wheel. In my mind the overall height whether it is a jbar short bar or long bar has more to do with sidebite than the angle or length. But I have never run anythign longer than a 20" j bar either.

dluna
Dirt Freak

Total posts: 334
posted February 16, 2005 01:39 PM  


 
Take a look Shawn.

[This message has been edited by dluna (edited February 16, 2005).]

[This message has been edited by dluna (edited February 18, 2005).]

21racer
Dirt Full Roller

Total posts: 56
posted February 16, 2005 05:59 PM  
the track i run most of the time is rough. a couple of years ago i ran a 10 inch short bar on four link. car was hard to handle in the holes jumping around. last year on my new car i redesined my mount for a 13 inch bar. this is a lot easier to drive when there are holes and ruts. car is not as jumpy when up on the bars

fastdad12
Dirt Full Roller

Total posts: 33
posted February 17, 2005 07:49 PM  
Most important thing to remember Jr, is always listen to your Dad.

andykmod
Dirt Freak

Total posts: 351
posted February 18, 2005 07:49 AM  
Not always true, if i listened to my dad i would of sold all my racing stuff and be sitting on the barstool right next to him.lol. As for the your short bar i think 8 inches is way to short, mine was 16 3/4 and worked great till this year now it's got to be 19 so i moved it behind the rearend.

fastdad12
Dirt Full Roller

Total posts: 33
posted February 18, 2005 05:41 PM  
We may sit on barstools next to each other, but it will be after the races for sure.
I think the j-bar deal is a good idea, and you may need a little longer link on the left, but I would try it 1st. just be prepared to change it.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted February 18, 2005 09:11 PM  
The longer the bar the more angle, the shorter the bar the less angle... if you run an 8 incher, run about 2 to 3 inches of rake..

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