Thread: Schumacher Mi5
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Old 10-11-2014, 05:18 AM   #2404
JWick
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Location: Near Nürnberg - Germany
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Quote:
Originally Posted by TryHard View Post
I'd had a look at out fitting my evo with a reactive rear, but a couple of things to bare in mind with the setup you've gone with.

1) Rear lowershock position - It's a lot further in when using the front arms on the rear, which will dramatically alter the level of grip.
2) Rear roll bar - obviously using the front bar on the rear is needed to work with the front arms, but a shorter bar will behave stiffer than the standard longer one.

Not saying that the reactive rear won't be an interesting experiment, but you'll need to bare the above in mind when running it.

Ed
I find it great, that other persons build it and find the same "problems".
But there are easy ways to solve some of them.
1) Rear lowershock position - To adjust the ride height in the same range, you have to use other/lower spring plate. So I used them from my old HB TCX (#73510). They suit perfekt and you can easy set for example 4mm ride height.
1.2) Shock position - The biggest problem is, that the lower shock attachment ist much more inside the car and the shock has another angle, so that you have a complete different spring and shock transmission. I calculate a little bit and get a correction factor of 1.17. So your old spring hardness multiplied with 1.17 result in the spring hardness, which you have to use with an active suspension. Also you have to use harder oil. Concrete it means, if you use for example the Spec-R 2.5 Spring now you have to use the 2.9 Spring and instead of 350cSt oil you have to use 400cSt to have comparable values.
2) Rear roll bar - Here the same. To get nearly the same values, you have to use a correction factor of 1.26. So your old diameter divided by 1.26 result in your new diameter of the roll bar. So instead of the 3 point rear roll bar you have to use the 1 point front roll bar.

The biggest problem ist, that the roll center values also changed and
I have no desire to calculate that one too and i´m not 100% sure if my calculates are general right.

But we will see it next week and i will give you an detailed report
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