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Old 04-06-2009, 05:14 PM   #1
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Default Up travel vs droop gauges??

Need help

On my T2 2009 I measured the down stops per the set-up sheet, everything all even put jacos rubber blues then when I checked the up travel to make sure both wheels touch the set board at the same time there was about 1.5mm difference between letf and right with the motor side of the car contacting first

Shocks are equal lenght
chassis is not flat
running lipo but car is balance

So i detach the shocks and wheels and measure the downstops on the block and it about 1.5 difference between L and R Man I'm lost and suggestion, thanks in advance
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Old 04-06-2009, 06:31 PM   #2
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Quote:
Originally Posted by dawgmeat View Post
chassis is not flat
Well if this is a true statement, that is more than likely the problem.


Also are you using the "adjustable" Shock pistons?

Way back when I ran an Xray. I had a car that I could never get the same up travel...It was the adjustable pistons.

Make sure that ON FULL extension of the shock that the pistons are not "Between" clicks. You may have to turn the bottom eyelet to get it to line up with the setscrew and not be between clicks. Hope that makes since.
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Old 04-06-2009, 07:39 PM   #3
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If the chassis isn't flat it is tweaked...take the wheels off and loosen all of the screws in the top deck. Have someone push down on the shock towers with the chassis flat on a piece of glass or setup board, and retighten the screws.

-rocky b
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Old 04-06-2009, 07:47 PM   #4
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Originally Posted by flatspunout View Post
If the chassis isn't flat it is tweaked...take the wheels off and loosen all of the screws in the top deck. Have someone push down on the shock towers with the chassis flat on a piece of glass or setup board, and retighten the screws.

-rocky b

Oh Crap I meant the chassis is flat anyway I think my problem was due to the diff bearing holder being where not even 1 side set normal the other set loose
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Old 04-06-2009, 07:55 PM   #5
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I had the same thing when I built my 008, it seemed no matter how many times I loosened and tightened the top plate it still had a little bit of tweak in the chassis. What I found was it was not in the long part of the top plate it was in the rear top plate between the rear bulkhead and the lay shaft bulkhead.... loosened the 4 screws and had my son hold it down on the set up board it, tightened the screws and that fixed it.

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Old 04-06-2009, 08:16 PM   #6
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Probably the tires. Sometimes tires are glued just slightly differently from one another. This can throw you on a wild goose chase for setting uptravel. I always trust the gauges, not the tires.
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Old 04-07-2009, 12:36 AM   #7
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Quote:
Originally Posted by dawgmeat View Post
Oh Crap I meant the chassis is flat anyway I think my problem was due to the diff bearing holder being where not even 1 side set normal the other set loose
Sounds like you found the problem yourself...diff eccentrics set to different slots can definitely tweak the chassis (voice of experience talking there )

-rocky b
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Old 04-07-2009, 09:26 AM   #8
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Quote:
Originally Posted by flatspunout View Post
Sounds like you found the problem yourself...diff eccentrics set to different slots can definitely tweak the chassis (voice of experience talking there )

-rocky b
Wouldn't his problem be in the shock collars in this case? The droop settings in the arms shouldn't give different reading from left to right.....should it??? I could be wrong though.
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Old 04-07-2009, 09:32 AM   #9
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I agree on the adjustable pistons. They can get hung up on the groove. Also check to see if you have a bent hinge pin. Had that happen a couple of times. I set the droop and the bent hinge pin would turn and throw everything off.
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Old 04-07-2009, 10:19 AM   #10
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Quote:
Originally Posted by dawgmeat View Post
Need help

On my T2 2009 I measured the down stops per the set-up sheet, everything all even put jacos rubber blues then when I checked the up travel to make sure both wheels touch the set board at the same time there was about 1.5mm difference between letf and right with the motor side of the car contacting first

Shocks are equal lenght
chassis is not flat
running lipo but car is balance

So i detach the shocks and wheels and measure the downstops on the block and it about 1.5 difference between L and R Man I'm lost and suggestion, thanks in advance
Hey Starling I think your problem is highlighted
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Old 04-07-2009, 11:14 AM   #11
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watch the camber links or cvds movement instead of the tires.
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Old 04-07-2009, 11:20 AM   #12
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A little off topic, but,

has anyone ever measured the droop setting and then checked the upstop measurement? Just wondering if there is a way to cross the 2 numbers? Something like a droop of 3 off the setup sheet equates to 6mm of upstop, keeping the same ride height of course.
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Old 04-07-2009, 03:15 PM   #13
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I think that would have to depend on which tire (diameter) your running...
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Old 04-07-2009, 03:30 PM   #14
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I think that would have to depend on which tire (diameter) your running...

If thats the case then you would have to run the exact same tire diameter or brand of tire to replicate any of the setups that are posted, more specifically when someone posts a setup with the upstop setting, set at just when tire leaves the ground. Or am I totally OTL on this?
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Old 04-07-2009, 04:53 PM   #15
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The results are repeatable if your using the same method. It's when you try to convert one method to the other that you run into problems...

Droop measurement would have to change depending on your wheel size. This why people use it for rubber tires as their diameter stays constant.

Upstop measurment does not change as you adjust it for wheel size. That's why most people use it in foam tire racing where tire diameter is constantly changing.

At least that's how it was explained to me. They are two different ways of measuring the same thing in different situations, and therefore incompatible...
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