Why did I spin?

[Mystery Bird]

Does anyone know why I spun so bad on this run? My car barely squats and I'm wondering if suspension is binding.

http://photosbyjim.smugmug.com/Other/Sat-Oct-13-Video-Clips/32905196_LhGHWZ#!i=2851298601&k=sgpszkj

[blkchevyz]

looks like the front unloaded but not sure if thats when you spun.
whats your air pressure at? seems like it was pretty high.

[Chopstix]

what is your current launch technique/suspension setup...parts/settings/tire pressures etc

[Mystery Bird]

That run was 22 psi. I used to be able to run much higher pressures.

[Mystery Bird]

what is your current launch technique/suspension setup...parts/settings/tire pressures etc

Launching the same way I always used to launch. Heat the tires as usual depending on temps, get on converter about 1500-1800, and stab it. This started this year when I added UMI drag bar, tunnel mount TA, and LCA relo brackets. When I had mostly stock sus the front wheels would come up a couple inches, rear would squat about half the travel of the wheel well, and dead hook every time. Now it's a crap shoot.

[Chopstix]

what pinion angle
What LCA angle/mounting point in the relocation bracket
Tq arm front mounting location
Tire pressure
Shocks/shock settings
Spring?
Rear sway bar/amt preload
Front sway bar?

if you can share this information we can help more.

P.S. girls squat, race cars don't

[Mystery Bird]

what pinion angle [ -2/-3 ]
What LCA angle/mounting point in the relocation bracket [Tried middle and bottom ]
Tq arm front mounting location[ Fixed]
Tire pressure [Between 20 and 26, depending on temp]
Shocks/shock settings [Stock original]
Spring? [Stock original]
Rear sway bar/amt preload [Don't know how to set that]
Front sway bar? [Gone years ago]

if you can share this information we can help more.

P.S. girls squat, race cars don't

[Chopstix]

is the front tq arm mount still at the tail shaft or shorter than OE?
Stock sway bar?

I agree it looks like it unloaded the front, but I'm trying to get an idea of where your current instant center is to help make suggestions....the OE shocks aren't helping things either

[Mystery Bird]

is the front tq arm mount still at the tail shaft or shorter than OE?
Stock sway bar?

I agree it looks like it unloaded the front, but I'm trying to get an idea of where your current instant center is to help make suggestions....the OE shocks aren't helping things either

See post 5. I removed the LCA relo brackets last night and if I can find someone to go with me Sat, I'm going to see if it makes a difference. I have surgery tomorrow so I can't go alone even if I felt better.

[blkchevyz]

thats doing something similar to what mine did when i had my car on the lowest lower control arm setting... the rear end would actually go up on the launch, problem i had it was shocking the tires way to hard(my theory), and moved it up 1 notch and that resolved my issue.

[shownomercy]

http://ls1tech.com/forums/12990311-post2.html

[Socom]

Try dropping your tire pressure to 18 pounds, thats what I run mine at and I cut a 1.6 60' on a stock motor car. I run my lca's on the bottom hole but I also dont use a drag bar

[Mystery Bird]

Try dropping your tire pressure to 18 pounds, thats what I run mine at and I cut a 1.6 60' on a stock motor car. I run my lca's on the bottom hole but I also dont use a drag bar

I've been running 22-28 PSI for the last five years without any issues spinning. It's something with this new suspension.

[blkchevyz]

what hole do you have your control arms in. socom your car looks pretty low, so the lowest probably would be best for you. mine is at stock high, and even a little higher since i have 9 inch that have larger axles.

[noice]

Your instant center changed, your lower control arms + torque arm which are a "3-link" have changed. That and your tires may have too much air. Also it seems that you lined up to the right of the groove a little bit.

[Mystery Bird]

Your instant center changed, your lower control arms + torque arm which are a "3-link" have changed. That and your tires may have too much air. Also it seems that you lined up to the right of the groove a little bit.
It might have been a bit out of the grove but I was following a big tire car like yours so thought I'd be OK. Hopefully we can get it to the track this Sat to see if the removal of the LCA relo's makes a difference.

[Salvo]

the vid isn't loading for me for some reason, but from what I have read you shouldn't need the relo brackets with the short torque arm. sounds like it has moved your instant center too far back and the rear is unloading. also are you running bias ply or radials? I was having an issue when I first made the switch to radials and was still in the bias ply mindset of dropping tire pressure. I then talked to some DR guys who reccomended upping the pressure. went up 5psi on pressure and cut my best 60' ever the next pass. let us know what you change and what happens

[Mystery Bird]

I've been using MT drag radials for the last 4-5 years so I'm sure I have a good feeling on how to use them. Thanks everyone for the ideas and suggestions. Hopefully we'll see a change this Sat with the brackets gone.

[blkchevyz]

does your control arm brackets only have one setting? i did gain a good amount of consistency when i installed mine, using the 1st setting... but mine are home made lol

[Chopstix]

its not a tire pressure issue as stated before you changed your instant center....need to know how it was setup before (all the details) and how it was set for the pass in the video, to make suggestions on which way to go.

[Salvo]

is your torque arm adjustable? if so where is the adjustment currently at? if the removal of the lca relocation brackets seem to help, you may be able to dial it in by adjusting the arm.

[Mystery Bird]

Before consisted of stock rear sway bar, long adjustable TA, and LCA's with poly bushings. Now; drag sway bar, short tunnel mount TA, and LCA relo brackets. Both setups the TA set to -2 -3.

[dawdaw]

Well everything you changed was for the good.

The Arb will not permit body roll like a sway bar which will reduce 60' times.

The short torque arms are good for a radial tire car and will hit the tire harder.

You just need to get it working and you'll get your slip.you want

[Chopstix]

so it sounds like you need to help keep weight on the tires longer....adjustable shocks would help there as well as attempting to adjust instant center forward...what mounting hole (top or bottom) do you currently have the front of the TQ arm mounted in. I would suggest bottom hole for the tq arm and top hole for the LCA, and adjust from there. Set pre-load of the drag bar so the car is leaving level and straight

[Louvit]

looked to me like the whole car lifted a bit after the launch, like the front brake locked or something..don't think so but had that look

[Mystery Bird]

So I went to the track without the LCA relo brackets and the car responded much better. The front end was lifting better and rear spinning less. Also, the 60 ft on average did not change at all. So the LCA relo brackets were definitely not needed in my combo.

[Mystery Bird]

Here's the difference. Not a great pic but you get the idea.
http://i1218.photobucket.com/albums/dd419/Mystery_Bird/launch_zps6ca41ab6.jpg

[popo8]

Here's the difference. Not a great pic but you get the idea.
http://i1218.photobucket.com/albums/dd419/Mystery_Bird/launch_zps6ca41ab6.jpg

Thats an awesome launch man.

MEMBER @ LTXtech.com

[Salvo]

good deal. what were your 60' times? did you still get some wheelspin? you may try some minor adjustments between passes on the torque arm angle and see if it likes it. but you are heading in the right direction for sure.

[Mystery Bird]

Average 60 was low 1.5's with a best of 1.50. We'll have to wait till next season for anymore adjusting. I still had some wheel spin but that was just pain cold weather and last day with minimal track prep.

[noice]

1.50s aren't that bad with a 3600lb car. The best I've ever gotten on all motor was 1.31 on slicks in a 2100lb car. I've gotten 1.40s on shit tracks before so it seems you are doing pretty good.

[Salvo]

1.50's are nothing to sneeze at. and with cooler track temps I wouldn't worry about that little wheelspin. sounds like you have it dialed in pretty well

[Mystery Bird]

Thanks guys, I thought the 60ft times were pretty good especially with the 4l80e and totally weight.

[Mystery Bird]

I went back and reviewed all my time slips and found that I ran my best 60ft yesterday at 1.48. The brackets are not going back on my car.

[noice]

I went back and reviewed all my time slips and found that I ran my best 60ft yesterday at 1.48. The brackets are not going back on my car.
Sell them damn things.

[Salvo]

I'd lock it down where it is and run it while you can. when weather gets warmer you can try hitting it a little harder off the line and see how hard it sticks

[blkchevyz]

damn nice improvement.

[Ibanezz]

I'll buy those LCA relos if you plan to sell em!

[Mystery Bird]

I went to SEMA this week and spoke with Mickey Thompson rep. I asked when do I know when my drag radials are done? They are just about at the wear bars. The first thing they said is when your 60ft gets inconsistent and they should be replaced every two years. Hhmmm, mine are three years old.

[dawdaw]

ya that would do it. were they pretty hard mystery bird?

[Mystery Bird]

ya that would do it. were they pretty hard mystery bird?
Hard to tell, they don't feel any different to me. I guess I would have to put a new one next to it and feel them both as a comparison.

[dawdaw]

I could for sure tell a huge difference between the old et street radials that were on the car (3 year old 325's) and my new 275 radial pros. difference was like night and day, the old ones were hard and brittle and the pros were soft.