Wheelie bar

Hey guys
Got a fast door car build in the works. Screw hemi, B&J with a converter.
Wanted to run a single wheelie bar but builder advises dual. Haven’t gotten to meet up with him this week but wanted your thoughts.
My thoughts were single maybe simpler to tune? Perhaps relying less on the bars to keep the car straight, and more on the suspension and wheel speed.
Still learning a lot as the build goes on, but I’ve seen it both ways on pro mods.
Questions:
Does single still get used to “steer” the car? If so, how?
Does titanium or carbon fiber have any advantages other than weight over chromoly?
Thanks for sharing your knowledge and experiences.

 

Dual suspension door car, you have more twist from suspension .
Single hard tail

 

I have a single bar with a roots blown hemi. Used it with a clutch and converter behind it. The worlds quickest roots car in the 1/8th uses a carbon single bar. Mine is a steel. The biggest thing I’ve seen Is the length. Ive been as long as a 90inch bar and short as a 65in bar. What’s weird is my clutch would spike the sensor around 2000 lbs on the launch and go .980 60fts. My converter on same bar goes .940 and only hits 1000 lbs at the most on the sensor.

 

Jay, is there a particular reason you choose to run a single? Again my very novice experience on the subject is that when these door cars get on the bars it will “steer” the car left or right. I feel that if you used a single it would be more for just hitting the tires and not so much for steering the car. Where as a dual would have to tune for both the hit and direction of the launch. This is evident by some teams offset bar heights.
You already have to tune the suspension and engine/transmission for whatever you using, dual or single. And as you said Jay, it was all how it hit the wheelie bar. Converter hitting bars softer with more wheel speed yielding quicker 60s sounds like my logic on this subject as well.
It was also my understanding that as quickcut said, solid cars/funny’s runs single, door cars run dual. But, why is that rule of thumb in place for some and not others?
I understand these are loaded questions, and can get a hundreds different reasons to run one or the other.
Again looking for anyone who’s tried em both and why they like one or the other. No big time player, just having fun going fast. Thanks

 

I started with a dual. My car was wicked heavy. Both bars were set the same height. I went with a single when others started using them. And it was lighter. I was a skeptic but a little bit of rear steer and we were all straight again. I have single titanium bar and a moly bar. Both seemed to work fine. Ti bar was 10lbs lighter.

 

What about these fabricated (bonded) carbon fiber bars. Are they turning out to be reliable?

 

What about tire shake mike? I heard that ruins those bars in a matter of a few passes?

 

Thanks for the responses. Talk to builder and he said we can run which ever I like. He did say he would rather run the dual, as he’s more familiar with that setup, but I still feel like single is the way I’m going. I noticed the MVM carbon bars have an off set to their single setup, so there must be some amount of “steering” that can be accounted for with those as well. Or maybe I’m missing the purpose?
Thanks again for sharing the knowledge.

 

I was just about to ask about the "Offset" single wheelie bar too. Does anyone have any experience with one , I have not seen many cars with them on yet.

 

I have a single wheelie bar and I made the mistake of having it to high. The car unloaded the left rear tire and turned left. No offset. FCC Denton, this year. You can watch the video to see what not to do. Larry

 

I run a top fuel bike. I run a double bar setup and have found it has to be set just right side to side to not steer the bike. This thread makes me wonder if offsetting a single bar could be adjusted to counter torque steer when on the bars hard. If you were to offset the bar to one side or the other, could this be used to help stay straight?

 

I run a top fuel bike with a double bar. I find that the bars need to be adjusted correctly from side to side to make the bike run straight. In years past, teams have tried single wheel setups, but I haven't seen one in a long time. I was just wondering if you could offset the single bar to one side or the other to help the vehicle drive straight? I don't think this would work very well on a bike, especially with the 14/31's we run. If you lean the bike one direction it drives the other way as it unloads one side of the tire. If you unload one side of the tire, the bike will drive that direction. An offset bar would certainly lean the bike depending on how far offset it was.
On a car you would not have that issue, so maybe could be used to steer straight. You guys have probably tried all that already, so it was just a thought.