60ft problems, suggestions on my findings?
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From: Concord, NC
60ft problems, suggestions on my findings? About 6 months ago, the car would consistantly 60ft in the low-mid 1.5 range. Thats not great, but i'm a full weight 6 speed car on 28's with 4.10's. Lately my 60 fts have just been absolute crap, mostly in the high 1.7 to mid 1.8's. I went out and did a little inspecting of my rear end set up, my pinion angle is still at -2* which is good, but i've notice my LCA's are at 0* exactly. They are in the lowest hole of my LCA relocation brackets. My question is, is this hurting the car at all? Would raising the rear via the coilovers so that i have a positive angle (from the rear to the front of the mount) help out at all? I've tried everything as far as shock settings go from stiff to loose both front and rear, i'm running out of ideas. I dont think its the tires, they have barely 40 passes on them with relatively small burnouts, and the wear holes in them are showing at about 60-65% tread life still. It feels like the car is just blowing the tires off at the line. I've lowered my 2 step from 5200 all the way down to 3800 in various increments as well but still the same result.I dont even want to imagine what would happen if i tried to launch on nitrous... Here's some videos from the last time out, any help would be greatly appreciated.
http://www.youtube.com/watch?v=45O7ij9gSz8
http://www.youtube.com/watch?v=Z9P8w...eature=related
http://www.youtube.com/watch?v=XQy3x...eature=related
http://www.youtube.com/watch?v=45O7ij9gSz8
http://www.youtube.com/watch?v=Z9P8w...eature=related
http://www.youtube.com/watch?v=XQy3x...eature=related
well it appears youre spinning off the line in the videos. you cut 1.5's and then all the sudden 1.7's without changing anything??? could just be track prep if thats the case.
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From: Concord, NC
I dont know, the weather has cooled off since the heat of the summer when i was running better, but its been progressivly worse, not just one night out. And it has been on 4 different tracks in the area, not just the one.
Have you checked to see if your slip yoke is twisted? I was cutting 1.6-1.7 60' than next time at the track I could barely cut a 1.9. Turns out my slip yoke was twisted and binding up my suspension. The driveline needs to slide forward into the transmission when you launch as it pushes forward when your rear end compresses.
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Clutch type posi unit may be giving up. This happened to us with a new rebuilt differential with about 30 runs. Test with the rear end raised, One person would hold one wheel and other person will try to spin the other wheel. When it was new, they were locked tight. So we changed it to a locker. Its a little different street driving but no more tires blowing thru.
Hope this helps,,Good luck.
Hope this helps,,Good luck.
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Edit: actually looks like part of the problem or is the problem. I can run 13 psi cold at my home track and hook most of the time but when i go off somewhere it is almost always a problem.
Last edited by nmass399; Sep 16, 2011 at 02:17 PM.
Thread Starter
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From: Concord, NC
Never did update this. I had a blown driver side rear qa1. It would stay compressed unless you adjusted it to full loose and then rebound. I ordered a new pair of Afcos and am putting them in as we speak. Letting the work light charge up some so I can finish the job.
Last edited by WheelsUp84z; Sep 23, 2011 at 09:29 AM.
Never did update this. I had a blown driver side rear qa1. It would stay compressed unless you adjusted it to full loose and then rebound. I ordered a new pair of Afcos and am putting them in as we sperm. Letting the work light charge up some so I can finish the job.
Thread Starter
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From: Concord, NC
made a few passes at civil wars with the afco's out of the box and their reccommended settings, 1.62 60 ft..a lot better! Car is still spinning on these crap QTP's, didnt get a chance to change anything for the true street competition (3 back to backs no changes) so i was stuck in the 1.6x's. And there were so many cars i didnt get any runs in accept those. here's a video, its deffinately transferring and staying there, just have to control my wheel spin, any suggestions?
http://www.youtube.com/user/SpeedJun...28/h7d3zeJMR38
http://www.youtube.com/user/SpeedJun...28/h7d3zeJMR38
