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Old 04-06-2011, 11:11 AM   #1
mlee
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Exclamation Spring Install affected my car's weight - NOT GOOD for racing

Anyone who's installed springs might be interested in this.

Been having problems getting off the line at the track lately. I've got trailing arms, swaybars, lowering springs and 18" Mickey Thompson DR's and still can't break a 1.9 60'

First thing we noticed was only the right tire was spinning on burnouts so we installed the JRE posi mod and went straight back out to the track.

Spinning both tires now, but at launch and every shift the car would break loose and not run in a straight line. Had to fight it all the way down the track to the point it was scary...

Owen at ARD suggested we put it on the scales and check all the suspension parts. The results totally shocked me (not him) as you can see in the pics the left rear mounts were not tightened down in the original factory position and there is a lot of play up there.

I've had lowering springs for a while, the car is perfectly aligned and drives great. The recent round of HP upgrades and running at the track exposed this one in a couple of ways. Left tire would not spin and car would not leave straight. We also have GoPro video somewhere that shows the car diving to one side on takeoff.

I would have never know this without scales... Check out the left rear at 490lbs... a simple loosen bolts and pry back over brought it to 886 which was much better. Then we put a 1/8 shim under each bolt and got it even closer.

EDIT: Quite sure my ONE WHEEL BURNOUT was attributed to this, however the posi mod does work quite well. I now do much better burnouts and getting 1.70 or better 60' times
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Old 04-06-2011, 12:25 PM   #2
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that's some badass info...thanks!
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Old 04-06-2011, 12:41 PM   #3
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Thanks for the info Mike! I'm curious to know if I'll experience the same issues.
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Old 04-06-2011, 12:52 PM   #4
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wow great info, so how exactle would one look out for this when installing drop springs? Sorry if it sounds like a dumb question. do I just make sure they ine up with the intial markings?
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Old 04-06-2011, 01:27 PM   #5
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Originally Posted by TJ91 View Post
wow great info, so how exactle would one look out for this when installing drop springs? Sorry if it sounds like a dumb question. do I just make sure they ine up with the intial markings?
Get a sharpie and draw circles around the bolts before you loosen them.

If your racing I would find someone with scales like these to see where you are at... It's a pretty quick job but finding scales might be a problem


Here's one video of a slightly crooked run, but the go pro on the front of the car really shows it last week.
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Old 04-06-2011, 01:33 PM   #6
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Why did the overall weight go up 6lbs just from making an adjustment?
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Old 04-06-2011, 01:44 PM   #7
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Why did the overall weight go up 6lbs just from making an adjustment?
Damn... you had me thinking on that one...

We swapped the rear tires and wheels while we had them off adjusting springs. The 18" Mickeys are getting packed in the trailer for C5Fest and I have a set of Nitto DR's on the stock rims. Now I have to swap them all out at home to roll on the 22's to AZ

And I did weigh the tires while they were off.
58 lbs for the 18"
61 lbs for the 20"

and it even adds up...
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Old 04-06-2011, 01:51 PM   #8
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How will coilovers prevent this? Don't they mount to the same holes?
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Old 04-06-2011, 02:02 PM   #9
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How will coilovers prevent this? Don't they mount to the same holes?
Mainly just an excuse cuz I want some..

...but you would be able to adjust them up or down to change the weigth distribution.

I was also suprised at the effect a small amount of air pressure does...
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Old 04-06-2011, 02:05 PM   #10
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Interesting info! Thank for posting it up.
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Old 04-06-2011, 02:15 PM   #11
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It sounds like whichever you use, checking the weight distribution is necessary.
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Old 04-06-2011, 02:29 PM   #12
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Originally Posted by Orange2SSRS View Post
It sounds like whichever you use, checking the weight distribution is necessary.
Yeah... either way you would never know...

I also noticed the last Total weight is one lb more. That was the small shims... These scales are pretty damn sensitive.
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Old 04-06-2011, 02:53 PM   #13
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Mainly just an excuse cuz I want some..
for coilovers - What brand were you thinking of going with?
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Old 04-06-2011, 03:00 PM   #14
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Owen knows some stuff, doesn't he!
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