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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 11-03-2012, 07:21 PM   #1
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Peg-leg burnout...kinda

Twice now, on the 3rd pass of a set of hot-laps, the diff on my car felt and sounded 'funny' and only did a 1-wheel burnout.

After having a chance to cool down, it seems fine. Is it possible that heat can cause the diff to slip rather than both wheels grab?

Any suggestions for trouble-shooting? It might be a bit problematic to get my dealer to replicate this issue and fix it under warranty.

Specifics:
Stock 2011 Automatic SS (except it has a cold air intake)
18" MT drag radials
36 passes so far (18 w/ drag radials)
Diff fluid changed at 1500 miles (13k total now)
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Old 11-03-2012, 07:35 PM   #2
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Well an LSD requires an additive in the gear oil in order for it to work properly. Perhaps a fluid change would help? It's interesting that the problem went away once you let things cool down.

Are the noises still present? Was is just the right wheel that was spinning?
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Old 11-04-2012, 12:36 AM   #3
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Actually, if was the left spinning. From what I've read, the right is normally the culprit when someone has a single tire spin.

As for fluids, I did use the GM additive. But I'm considering swapping the fluid again just to see what will happen.
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Old 11-04-2012, 06:42 AM   #4
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Quote:
Originally Posted by Spektrum View Post
Well an LSD requires an additive in the gear oil in order for it to work properly. Perhaps a fluid change would help? It's interesting that the problem went away once you let things cool down.

Are the noises still present? Was is just the right wheel that was spinning?
The additive is actually what helps let the clutches slip, when say you are going around a corner.... forget to add the additive and your rear will start chattering when you turn since the clutches will have a harder time slipping... the additive is know as "friction modifier"... The problem almost sounds like too much additive, but not sure what that would actually do...
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Old 11-04-2012, 06:43 AM   #5
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Quote:
Originally Posted by Three of Swords View Post
Actually, if was the left spinning. From what I've read, the right is normally the culprit when someone has a single tire spin.

As for fluids, I did use the GM additive. But I'm considering swapping the fluid again just to see what will happen.
If the left tire is the one with a less traction it is the one that will spin...

Reviewing the video, it appears that both tires were spinning....
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Old 11-04-2012, 07:19 AM   #6
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This video was taken by my son during the event at Lapeer Dragway 11/3/2012. This shows what Three of Swords is talking about when he says it was only doing a one tire burn out.

I am currently down loading one of his two tire burnouts and will post later.


One tire burnout.





Two tire burnout


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Last edited by rtcat600man; 11-04-2012 at 09:10 AM. Reason: added the two tire burnout
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Old 11-04-2012, 07:20 AM   #7
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Are you sure that you got enough water on both tires before doing the burnout? I had this happen a couple of times and it was because of this. This is especially true if the tires were already hot and sticky to start with. The wet tire will spin and the dry tire will stick. As the tires cooled down, it made it easier for them to both spin.
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Old 11-04-2012, 09:11 AM   #8
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from the passenger side...

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Old 11-04-2012, 10:18 AM   #9
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Just saw the videos. hmm...

I guess I could be wrong about the burnout. It felt and sounded the same way as this spring when the crew member told me my right side wasn't spinning (I actually had to wait until the water drained off the tire). There was a low grinding/rumbling noise and a weird vibration.

It could have been a water issue. They back you into the water pit, but if I wasn't lined up properly, I could have had very little water. And it was the 3rd pass. So the tires would have already been very hot.

Next time, 3rd hot lap, I'll just dust them off and see what happens.
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Old 11-04-2012, 10:28 AM   #10
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This is a very common problem w/ the SS. Once you get some DR's on w/ traction or higher HP you'll start to overpower the clutches in the rear end and get the one wheel spin. Ted Jannetty sells a posi mod that corrects this problem.
http://www.camaro5.com/forums/showthread.php?t=126085

http://jreperformanceparts.com/techn..._store=default
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Old 11-04-2012, 10:37 AM   #11
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Quote:
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This is a very common problem w/ the SS. Once you get some DR's on w/ traction or higher HP you'll start to overpower the clutches in the rear end and get the one wheel spin. Ted Jannetty sells a posi mod that corrects this problem.
http://www.camaro5.com/forums/showthread.php?t=126085

http://jreperformanceparts.com/techn..._store=default
would you expect the clutches to make the grinding/rumbling noise described?
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Old 11-04-2012, 10:49 AM   #12
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would you expect the clutches to make the grinding/rumbling noise described?
Not at all... I missed that post and just read it. Don't know what would cause that.

But the Posi mod comes with a new stiffer spring.
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Old 11-04-2012, 09:00 PM   #13
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It's always my passenger tire that spins and the drivers that doesn't. When I leave the track the passenger bumper is covered in rubber and the drivers side looks like I just washed it :(

Gotta get that fixed over the winter.
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Old 11-04-2012, 09:45 PM   #14
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All I saw was a V6 whipping up on a V8. Oh yea.
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Old 11-04-2012, 11:33 PM   #15
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Thanks for the info, everyone.

Quote:
Originally Posted by spyderbuddy View Post
All I saw was a V6 whipping up on a V8. Oh yea.
Yeah, yeah, yeah... He tree'd me.

Both of us had a terrible first Reaction Time since it was the first pass of the day (he had a .342 vs my .625). The next pass we both did much better (he had a .067 and I had a .064).
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Old 11-05-2012, 06:00 AM   #16
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Quote:
Originally Posted by spyderbuddy View Post
All I saw was a V6 whipping up on a V8. Oh yea.

Sorry, I stopped the video at the point delibertly. More to show what a good treeing can do, what the rest of the video shows is him coming around me at the big end.

Quote:
Originally Posted by Three of Swords View Post
Thanks for the info, everyone.



Yeah, yeah, yeah... He tree'd me.

Both of us had a terrible first Reaction Time since it was the first pass of the day (he had a .342 vs my .625). The next pass we both did much better (he had a .067 and I had a .064).
Indeed I did tree you on that one. Shows what 0.3 can do for you at mid track. However, the V8 did show it self and come around me.

The second run wasn't even close as we both caught good lights. Notice I didn't show that video......
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Old 11-05-2012, 07:02 AM   #17
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Sorry, I stopped the video at the point delibertly. More to show what a good treeing can do, what the rest of the video shows is him coming around me at the big end.



Indeed I did tree you on that one. Shows what 0.3 can do for you at mid track. However, the V8 did show it self and come around me.

The second run wasn't even close as we both caught good lights. Notice I didn't show that video......
Well... i could post my run against him...
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Old 11-05-2012, 11:23 AM   #18
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Well... i could post my run against him...
The one where he spun big time off the line and watched you disappear into the sunset. ....
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Old 06-21-2013, 01:15 AM   #19
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im having some one tire fire problems too!!! it will drift out when i turn left but right just spins the passenger side tire. just started doing this!! i was told it had synthetic oil put in does anyone know what a good syn. diff oil cjoice would be and do i still need the gm addative? does it have to be specific addative being that i have synthetic oil in the diff now??
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Old 06-21-2013, 01:16 AM   #20
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even in the rain its doing this!!!
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Old 06-21-2013, 05:42 AM   #21
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Sounds like a job for a Detroit Locker
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Old 06-21-2013, 06:20 AM   #22
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Mine started to do that last year at the track. When it was doing a one wheel burnout,it was making a noise.
Last winter, we installed a JRE posi mod. Pull both wheels no problem.
Some also upgrade the diff to a Eaton truetrac unit that replaces the factory unit. Truetrac works verynice aswell.
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Old 06-21-2013, 01:06 PM   #23
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That's a sticky tire for a stock converter need water in the burnout
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