Wheelie bar question???

I agree with some guys , your 2.60 first ratio coupled with 4.11 gear and small tire are a big part of your problem . you have too much torque on the tire to deal with. ratio from 1.80 to 2.11 will work much better.
Claude

 

Yes loosen it up. You may want to install some lighter front springs and preload them for a faster transfer. Like everyone says your first gear is alittle steep. If you cant afford a gear change then lower the thrust by lowering the input torque. Fatten that puppy up! Install a pinch valve and kill the power off the line. When it gets up on the tire open the valve to lean it. It will 60 better than the lower gear BUT( unless this is a 4 speed ) when you shift into second you will lose a lot of rpm because the ratios are so far apart. So that should give you initial hook and enough transfer to get you going without breaking the bank.More later.

 

I see nothing about wheelstands being a problem, Perhaps the interpretation is wrong. Need more info flyboy68.

 

200on10.5 there might be a little confusion. I've studied my videos a bunch of times and some how the wheelie bar is hitting the ground way before any "real" movement of the chassis or front end. It worked better when we limited the front end to only 2-3in travel, 60s didn't show it but the launch seemed to be smoother.

Mike I will try to email you that video tonight, and you can let us know what you think. I don't have a lot of "good views" but one shot shows everything pretty well. I'll get it uploaded and send it to you.

One more thing, this year i'm running the digital 7 7530T so i'll be able to create a launch timing curve. I think this will help, yet I don't want to kill my 60s...even though they haven't been awesome. Best was 1.28 spinning badly (though no hop on launch), when I hook somewhat (with the typical hop) consistant 1.30 1.31's. Way too slow for my class...

 

What is your best time and mph with this car
Claude

 

Wildride- Best ET was 8.59 @ 158

Mike i'm using coil over springs (i believe rated at 180lbs?) Strange dual adjustable shocks. Pinion angle is down about 2 degrees. We're using ladder bars made by chassis engineering, they have the adjustment (turn for lengthening and shortening) on the bottom bar. We had to cut about 2" inches off them for fitting purposes (total length is about 31"). The rims are 12" wide in the video, however i'm going to 14" wide this year. Axles are 33 spline moser's.

My dad is the one who built the chassis, it was not built by a professional (sorry dad). He and I will be the first to tell you that we are not chassis guys. The chassis has been squared off several times, it's straight, not to say that it's right though.

We are located in Wichita, Ks.

 

What tire size are you planning to mount on your 14" wheels.
Claude

 

33x10.5x15w M/T slicks

 

sorry Fly Boy , i'm not familiar with 10.5 " class , what are the advantage to put 10.5" tire on 14"" rims.

 

wildride boy-no problem, they put those tires on 14" rims to stretch the sidewall out enough to actually use the sidewall as tread. Basically manipulating the tire, and it's usually worth about 1" more tread. Most guys in that class who do that have about 12-12.5" tread on the ground, which is a lot of gain from about 11" (approx. treadwidth on a 10.5w tire) when you're in a "tire size limited" class. You should use beadlocks so the tire doesn't want to come off the rim at high mph, but most just double up on the rim screws. Kind of crazy really.

Mike-The distance from the front ladder bar bolt to the ground is roughly 6". We acutally ordered a shaft for the lenco that links two of the sections together in order to eliminate one gear. That way you don't have to do any drive shaft work. So i'll be getting rid of the 2.60 first gear. We'll go with a 2.04 or 2.08 first gear, we could go even lower than that. That'll help calm it down a little. Now on the shocks, do you recommend loosening the rebound one click at a time if those settings don't initially work? Or tightening? I'm sure you mean loosen, just making sure. As far as compression what characteristics am I looking for before I adjust the compression side?

Also on the wheelie bar, should I stay at 62" and raise it to 12"? They're pretty weak wheelie bars, we've actually got material for making stronger ones. We thought maybe going longer though. Basically just asking 12" height to what length you think?

If it's okay i'd like to take some pictures of the chassis and send them to you tonight Mike.

 

You have several items to check and run down

You have several items to check and run down. I ran an old school ladder bar backhalf on 10.5s @ 3200lbs eventually got it down to 1.16 60' with a 632 on spray. 1. a ladder bar will react differently as to how it hits the bars vs. a 4 link. I would be able to smack the bars before the nose rose up. the short IC, chassis lift and compression of the tire sidewall was enough to slap the bars. (some of the side videos looked like the tire was crushed enough for the right rim to touch the track, even @ 11lbs of pressure - no beadlocks). 2. make the front suspension as stiff as possible and you may get to the point that you will set the limiters for 0" travel or preload the limiters (be careful here). 3. Make sure that the rear coil overs are adjusted correctly I used the Strange pro mod special valving and still set them 2 click from full stiff on both bump & rebound. 4. the 2.60 1st gear is killing you, I ran a 1.66 glide with a loose converter and went to a 3.89 rear gear to calm the launch. 5. Don't be afraid to take timing out of the motor to get it to launch (I realize that you have a blown alky car, but Oddy has been suggesting that removing up to 15* of timing is OK @ launch, and it has fixed two other blown 10.5 cars in the area that spent all of 2005 either annihilating tires or wheelstanding up on the bars).
hope this helps

 

Hey outlaw 10.5 thanks for the info! I do plan on limiting the front travel, and this year i'm running a digital programmable 7 box so i'll be able to create a launch timing curve to calm it down. I'm going to a 3 sp (eliminating one gear on the lenco) so i'll have a 2.04 first gear instead of the 2.60. Thanks again to all you guys for the help! I really appreciate it...

Josh