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Wheelie Bar questions #573777
01/05/10 02:24 PM 01/05/10 02:24 PM
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Posts: 184
Central Coast
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Plumcrazyracing Offline OP
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Central Coast
Just built and installed bars (spring loaded) on a 71 Duster. Overal length is 64 inches. Caltracs, split mono leaf, rancho 5 way, transbrake, 3330 race weight, 10 oh to 10.20

I would like to know where to set the wheel height on the bars (at least a general idea). I have been told that i need almost 12" of height. Any truth to this?


Thanks!
Re: Wheelie Bar questions [Re: Plumcrazyracing] #573778
01/05/10 04:30 PM 01/05/10 04:30 PM
Joined: Oct 2008
Posts: 35
Johnstown,PA
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curt jr Offline
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Johnstown,PA
According to most wheelie bar charts that I've seen at the shop(BGR) and when we set them its usually between 3" to 6" on a ladder bar and 4 link car. On a spring car or Cal-Trac setup we generally set them no more than 8"

1971 dodge challenger 500ci 9.70s 1969 superbee 383 4speed numbers matching original redline tires 1970 challenger round tube chassis project
Re: Wheelie Bar questions [Re: Plumcrazyracing] #573779
01/05/10 04:42 PM 01/05/10 04:42 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

Just built and installed bars (spring loaded) on a 71 Duster. Overal length is 64 inches. Caltracs, split mono leaf, rancho 5 way, transbrake, 3330 race weight, 10 oh to 10.20

I would like to know where to set the wheel height on the bars (at least a general idea). I have been told that i need almost 12" of height. Any truth to this?


Thanks!



I set my about 4" to the C/L of the wheel... but I
run a 4-link... your going to get more wind up so
I would start about 5" and play with it from there...
you need to remember that you also have the spring
thats on them... lift the bars all the way up to
see where they would be locked up
Re: Wheelie Bar questions [Re: MR_P_BODY] #573780
01/05/10 09:07 PM 01/05/10 09:07 PM
Joined: Jan 2004
Posts: 581
Hamiltucky
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RBDuster Offline
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Hamiltucky
I put a set on when I installed the new motor. Mine are set at 11 inch. You can see the car working below,
Re: Wheelie Bar questions [Re: Plumcrazyracing] #573781
01/05/10 09:31 PM 01/05/10 09:31 PM
Joined: Dec 2008
Posts: 184
Central Coast
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Plumcrazyracing Offline OP
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Mr P Body: Is that 4" to C/L mean 4" above C/L?

RBDuster: How long are your bars? I assume you run Caltracs? Pics?

Thanks for the info guys!

Steve
Re: Wheelie Bar questions [Re: Plumcrazyracing] #573782
01/05/10 10:02 PM 01/05/10 10:02 PM
Joined: Dec 2004
Posts: 1,256
Salisbury North Carolina
8secDart Offline
pro stock
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Salisbury North Carolina
A beer can,no I'am not picking.Give the pass side one flat more and your good to go.
Re: Wheelie Bar questions [Re: Plumcrazyracing] #573783
01/05/10 10:07 PM 01/05/10 10:07 PM
Joined: Jun 2008
Posts: 56
SWEET HOME ALABAMA
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SWEET HOME ALABAMA
I have a 71 duster, I welded my wheelie bars on at 9" from the ground to center of wheelie bar wheel, no tension on springs. Depending on how hard the car hits the wheelie bars and how high you want it to stand up,depends on the spring tension. Tighten the springs up to keep the front end down.

5714422-THEMONEYSHOT3.bmp (105 downloads)
71 DUSTER 416 ET 6.33 @ 107 1.33 60FT
Re: Wheelie Bar questions [Re: Plumcrazyracing] #573784
01/05/10 10:24 PM 01/05/10 10:24 PM
Joined: Jan 2004
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Hamiltucky
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RBDuster Offline
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Hamiltucky
Quote:

RBDuster: How long are your bars? I assume you run Caltracs? Pics?



Bars are 60" and spring loaded. No Caltracs just ladderbars
Re: Wheelie Bar questions [Re: ITSDUSTA416] #573785
01/05/10 10:26 PM 01/05/10 10:26 PM
Joined: Jan 2005
Posts: 866
Winnipeg ,Mb. CA.
chryco Offline
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Winnipeg ,Mb. CA.
4 - 6" as per Comp Eng. details .I`m starting there .
Chryco

5714493-IMG_2512.jpg (103 downloads)
Gas is fer washin' parts ....Alky`s fer drinkin' ...Nitro`s fer Racin'!
Re: Wheelie Bar questions [Re: curt jr] #573786
01/05/10 11:10 PM 01/05/10 11:10 PM
Joined: Jun 2005
Posts: 1,283
Colorado,U.S.A
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4404dart Offline
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Colorado,U.S.A
Quote:

According to most wheelie bar charts that I've seen at the shop(BGR) and when we set them its usually between 3" to 6" on a ladder bar and 4 link car. On a spring car or Cal-Trac setup we generally set them no more than 8"



I tried 4 to 5 inches, and they hit so hard it unloaded the tires. I will try to get them between 8 and 10 to start this year. I watched a video of a camaro on yellowbullet and you couldn't beleive how much the rear rotates with caltracs and split mono leafs

Re: Wheelie Bar questions [Re: 4404dart] #573787
01/05/10 11:49 PM 01/05/10 11:49 PM
Joined: Jan 2003
Posts: 20,752
A collage of whims
topside Offline
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A collage of whims
Mine are set at 10"L/10.5"R, measured at the center, car's happy with that. Car likes to hike its LF a bit more than the RF; probably under-caged, but it's a vintage car so I'm not changing that. Modified SS springs, footbrake, 5800stall. No snubber. 13x31s, usually @ 7.5PSI cold. It'll carry the front tires out a good way, as much as 100 feet, on a good track, sits down very politely. Just knocks the shoe polish off about 15% or so of the bar's wheels. Goes straight as a string. 368" SB Duster/904/5.38 Dana, about 3000lbs, my weight about 160. 100lbs ballast. Low 10s with a 750 carb, should go 10.0 with the 1050. (If that info helps.)
Re: Wheelie Bar questions [Re: Plumcrazyracing] #573788
01/06/10 12:17 AM 01/06/10 12:17 AM
Joined: Jun 2003
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Romeo MI
MR_P_BODY Offline
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Quote:

Mr P Body: Is that 4" to C/L mean 4" above C/L?


4" is to the center line of the wheelie bar wheel,
in gear... in the pic in my sig they were set at
6" for show and tell... if you set them to high you
can have to much momentum going up and bottom out
the spring and unload the tire. Also my set up is
using a trans brake... go a little higher if foot braking
(that will roll the pinion up higher)... in that pic
the 60' was 1.20 or 1.21... I set the right bar
1/4" lower than the left

Last edited by MR_P_BODY; 01/06/10 12:25 AM.
Post deleted by Defbob [Re: MR_P_BODY] #573789
01/06/10 12:36 AM 01/06/10 12:36 AM

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Re: Wheelie Bar questions #573790
01/06/10 01:23 AM 01/06/10 01:23 AM
Joined: Oct 2004
Posts: 6,293
Northeast, Alpine, NY
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9 Sec Phill Offline
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When I installed the bars on the old cuda we started at 6". It blew the tires off. Raised them to 8". It still spun but not that bad. In this pic they are at 11" And it alowwed the car to hook and lift the front about an inch high.

5714942-DSC02438.JPG (127 downloads)
Re: Wheelie Bar questions [Re: 9 Sec Phill] #573791
01/06/10 01:25 AM 01/06/10 01:25 AM
Joined: Oct 2004
Posts: 6,293
Northeast, Alpine, NY
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9 Sec Phill Offline
On a road near you
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Northeast, Alpine, NY
With out the bars

5714947-cudapinks.jpg (104 downloads)
Re: Wheelie Bar questions [Re: 9 Sec Phill] #573792
01/06/10 01:31 AM 01/06/10 01:31 AM
Joined: Jan 2003
Posts: 19,361
Las Vegas
Al_Alguire Offline
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Las Vegas
Well I will be the stick in the mud. BUt as you can see it will depend on the car. There is no magic answer. A caltrac car making 500hp with a SB will need something different thsn the saem car with a 1000hp BB. Pick a hieght and get out and run it, video is an excellent tool when tuning things like wheelie bar height.

"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
Re: Wheelie Bar questions [Re: Al_Alguire] #573793
01/06/10 01:55 AM 01/06/10 01:55 AM
Joined: Apr 2004
Posts: 1,981
SE Michigan
TS3303 Offline
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TS3303  Offline
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Quote:

Well I will be the stick in the mud. BUt as you can see it will depend on the car. There is no magic answer. A caltrac car making 500hp with a SB will need something different thsn the saem car with a 1000hp BB. Pick a hieght and get out and run it, video is an excellent tool when tuning things like wheelie bar height.



I agree with Al, it all depends with how quickly it pitch rotates. Some if there too high the momentum will unload the tires when the bars hit. On 9 sec Phils IMO when he had them low it wasn't allowing the chassis to transfer weight and spinning but not from unloading.
Re: Wheelie Bar questions [Re: TS3303] #573794
01/06/10 02:38 AM 01/06/10 02:38 AM
Joined: Dec 2008
Posts: 184
Central Coast
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Plumcrazyracing Offline OP
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Central Coast
Thank you for the info guys. Forgive me for asking, but could someone explain "pitch rotate".

For anyone that is interested, i am posting a link of video of the cars' launch. Any comments are welcome. My car is videoed right at the 16 second mark. Purple 71 duster in the left lane.
http://www.youtube.com/watch?v=gnzDm3PHGxY
Re: Wheelie Bar questions [Re: Plumcrazyracing] #573795
01/06/10 02:47 AM 01/06/10 02:47 AM
Joined: Apr 2004
Posts: 1,981
SE Michigan
TS3303 Offline
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TS3303  Offline
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basically the technical term for weight transfer.
Re: Wheelie Bar questions [Re: Al_Alguire] #573796
01/06/10 06:15 AM 01/06/10 06:15 AM
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MN
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JERICOGTX Offline
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Quote:

Well I will be the stick in the mud. BUt as you can see it will depend on the car. There is no magic answer. A caltrac car making 500hp with a SB will need something different thsn the saem car with a 1000hp BB. Pick a hieght and get out and run it, video is an excellent tool when tuning things like wheelie bar height.



I'll be a bigger stick in the mud then Al, and say tune the suspension, and not the wheelie bars to make the car 60' better.

Jeff

69 GTX 68 Road Runner
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