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Author Topic:   Solid Pullbar
dluna
Dirt Full Roller

Total posts: 42
posted August 27, 2002 01:43 AM
This past weekend we tried to run a solid pullbar with the 90/10 shock removed. For the first time since a BIG crash mid-season of last year our car FINALLY lifted again. I mean this sucker hiked up like nobodies business. When we took the rubber biscuit pullbar off, it didnít seem to have much preload in it at ALL. Would this probably have been our problem since the wreck?

The track was tacky and our motor threw a rod through the oil pan during the middle of our heat race so we didnít get the chance to try it on dry-slick. So my question is if anybody thinks this solid bar will work when it turns dry?

From what I understand so far, the pullbar simply pulls up on the chassis under acceleration. When this happens, weight is then transferred to the rear tires to help plant them. So I believe that the springs and rubber biscuits on the pullbars help make this transfer less erratic. When patches of tacky/dry/tacky/dry are encountered, the suspension in the pullbar will compress and decompress to help compensate to keep the tire patch in tact with the racing surface.

Again back to my question. If there is nothing there (springs, etcÖ) to help compensate for traction and then the loss of traction, wont the rear tires just want to spin like crazy on a slick track? Donít get me wrong, it REALLY hooks the car up on tackyÖI am just wondering what to expect when the track turns dry. Has anybody had luck with the solid bar on slick tracks? Do you just decrease the angle in the bar as the track progressively gets slicker?

Sorry for writing so much once again. I am just really interested in finding out what everybody really thinks a pullbars purpose is!!!

driver27
Dirt Full Roller

Total posts: 40
posted August 27, 2002 07:38 AM
Cant answer your question, but im interested in whether this will work on a swingarm car for a dry slick track. If anyone has any experience, please let me know.

Thanks

24mod
Dirt Roller

Total posts: 5
posted August 27, 2002 03:28 PM
I run a 2 link swingarm and have a solid pullbar. The track stays slick and I have the best forward bite with a solid than any other. Run the bar at the same angles as you would a spring loaded and let her eat. Of course, everybody has their preferences but I have seen and drove cars with all the different rear suspensions and the solid hooks hard!

WPP
Dirt Maniac

Total posts: 162
posted August 27, 2002 04:50 PM
I am also wanting to try the solid bar with a swingarm but my bar needs to be 37inches is this too long

2nd2none
Dirt Maniac

Total posts: 193
posted August 27, 2002 07:36 PM
As with all my other post on this subject, the solid bar works the best either dry or tacky, i started the year out with a 600/1200 progressive afco pullbar, with about 3/4" of travel, car worked pretty good like this but i had a hard wreck into the wall and the pullbar was bent, among everything else on the rearend, a buddy of mine had been runnin a solid bar most of the year and was sittin top 5 in points, so when i was putting the car back together i put the solid bar on with same angle and same amount of pinion. went out and could tell a noticable difference. And our track is almost always dry and i could still hike up on it

[This message has been edited by 2nd2none (edited August 27, 2002).]

WPP
Dirt Maniac

Total posts: 162
posted August 27, 2002 09:07 PM
2nd2none i am also running the afco pullbar but with a hyper coil spring with 600/1200 rate i read were you said you was getting 3/4 travel you must have been really setting the preload tight i am getting 2 1/2 inches right now but the last couple of weeks i have started tightening the preload up and it is getting better all the time i started out with 3 1/2 inches but i have been reading the post with the solid bar and i have seen were my spring gets tighter the better it gets so it really make me wonder on the solid bar it may work how much preload did you run with your spring and do you run a 90-10 with your solid bar i just thought with a solid bar you would need the damper shock when you got off the gas with the traction you guys are getting with the solid barbut is a 37inch bar to long thanks for the information

dluna
Dirt Full Roller

Total posts: 42
posted August 27, 2002 10:23 PM
WPP, I can tell you from the experience we had last week about your 90/10 damper question. I was a little concerned that all heck would break loose once we got off the gas, but the car sets down nice and smooth without effecting entry much at all. Our bar is 25" and runs down 20 degrees.

I was hoping that somebody would comment about what I think the purpose of a pullbar is. If no comments about how one works, does anybody have a website that I could view to learn more???

Thanks!

2nd2none
Dirt Maniac

Total posts: 193
posted August 28, 2002 12:42 PM
The first time I went out with the solid pullbar on i left the 90/10 shock off, i was a little leary about what it was going to do getting in the corner, i could feel the car was lifted/hiked up but when i was getting in the corner it felt fine, no wheelhop or anything. Honestly i cant tell you how much preload i had in the afco pullbar, A latemodel driver in this area was helping me on my setup and he told me to put a solid bar on earlier in the season, he said if i wasnt going to put the solid bar on to put a $h!t load of preload in the afco bar, which is what i did. At beginning of year i only had a 1/4" of preload in it and it wasnt going forward too well and was getting about 2 1/2" of travel also. And like yourself the more preload i was cranking into it the better it would get.

does your pullbar mount up by the driveshaft loop almost at the tailshaft of tranny? if so that long of a solid bar will work also. Thats the way my buddies car is setup.

WPP
Dirt Maniac

Total posts: 162
posted August 28, 2002 05:59 PM
Yes it mounts on the drive shaft loop the solid bar would have to be about 35 inches i am still thinking about trying it if i remember right you are running a 2-link i run a swingarm if this works with a 2 linl it should work with a swingarm because we run a birdcages you know you need more spring rate with aswingarm with not alot of movement that if i am thinking right but still thinking about that 90-10 oh thanks for the info 2nd2none

dirtracer14
Dirt Freak

Total posts: 333
posted August 28, 2002 07:40 PM UIN: 23443678
I have left my 90/10 shock on for 1 real reason....if any of you have broke a pullbar its kinda ugly. With the shock on there it will help min the damage....i found out last year ...only lost pullbar and drive shaft!

chief4car
Dirt Full Roller

Total posts: 46
posted August 28, 2002 09:04 PM
I run monoleafs on the rear of my car, with a springloaded pullbar.

Could a soilid bar work for this also. If so what can i expect.

Thanks
Jim

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