XIDA-S how much stroke travel needed?

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04-04-2012, 01:03 PM

#21

k24madness

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Quote:

Originally Posted by emilio700

Stroke (not travel) is 103mm front, 120mm rear. Damper body lengths, stops and mounts are configured to allow a 225/45/15 on our 9" wheel to hit the front shock tower bulge with about 5-10mm interference with -3° camber. This overlap was designed in to allow a bit more bump travel with narrower 205's on 8" wheels. Our enduro cars all have polished tubs and a nice wedge of rubber under there.

On a Miata at 4" with the 225/45 on our 9" combo, almost all the stroke is used
up with sag, very little bump travel left. At rest, there is usually only 10mm or so left before the stop is engaged up front. On paper that sounds shaky. On track, it drowns in win soup.

Emillio are the above comments with NB top hats or AST top mounts?

04-04-2012, 11:20 PM

#22

wannafbody

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Suspension theory question-if you have a 7 inch spring with some preload on the rear isn't that enough to extend the shock on dips and broken pavement? And isn't the unsprung weight enough to continue to extend the shock once the spring is totally extended?

04-06-2012, 05:16 PM

#23

EErockMiata

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Quote:

Originally Posted by wannafbody

a 7" spring is long enough where you'd start to run into problems with spring bind...

04-07-2012, 04:26 AM

#24

lassi

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Quote:

Originally Posted by wannafbody

As long as it`s still loose at full droop you might run into a situation where the shock does not extend enough into the dip. Unsprung weight will not be enough to push the tire down. Not fast enough and will not take any load when extended and therefore not really doing anything...

Quote:

Originally Posted by EErockMiata

a 7" spring is long enough where you'd start to run into problems with spring bind...

I have Xidas and 7" springs in the rear. No problem with bind. See video;

http://vimeo.com/37469352

04-07-2012, 07:04 AM

#25

owenwilliams

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^ Great video

04-07-2012, 07:45 PM

#26

EErockMiata

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Quote:

Originally Posted by lassi

I have Xidas and 7" springs in the rear. No problem with bind. See video;

http://vimeo.com/37469352

Wow. I should have kept my mouth shut. I could have sworn when i did all my beer can measuring it wouldn't work out. Failure.

Quote:

Originally Posted by owenwilliams

^ Great video

indeed. that's a great vid. thanks for posting it.

related: is the motion ratio of the miata ~1.6?

04-07-2012, 11:30 PM

#27

wannafbody

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I think Brain and others have had issues with softer 6 inch springs.

04-08-2012, 01:33 PM

#28

lassi

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Quote:

Originally Posted by wannafbody

I think Brain and others have had issues with softer 6 inch springs.

6" springs made my piggly MSM sit way to low in the rear for street duty. And I don`t even have a rollbar yet...

Fronts are fine with 6" springs, even have some compression left on the helpers with car static on the ground.

7" in the rear gives me my desired ride height, but need extra bushing on shaft to have enough droop available to let the helper do more than beeing a spring spacer. Also full droop is most likely way out of range of of the chassis ability to move independently with the rear swaybar connected.

I will make new video with the new spring locators and 6" springs along with FM`s tophat spacers to see if it will put the suspension in the correct range of motion. Maybe what the MSM`s should really have is a heavier rate helper...