FX3 Issue Solved

[Bruce]

Greetings from DownUnder.

Ive been wondering about an issue with the FX3 for some time on my 91 ZR1. I have never felt any different regardless of settings. When I bought the car I put it in my workshop for a few months to sort out all and sundry of minor problems. The plug to the FX3 module was removed and on plugging it back in I got the usual 'service' lamp up. I checked all the gears on top of the shocks and found one broken. So I ordered some more (and a few spares) and replaced the broken one on the left rear. So now I dont have any lights coming up on the DIC. What got me wondering if there was still an issue, was first, that other people noting on this site that theirs works fine, and second, on hard acceleration the car breaks loose to the right hand side. Mine goes to the left.

Well I took both rear shocks out to have a look at them and check their operation. I had both shocks clamped up in the vice on the bench. I pushed each one down in bounce to see how they were damping (on rebound as well). To my surprise they were different!

Ok, so I checked the small piston drive gear at the top of the shock, they were not broken. I turned each gear fully clockwise on both shocks. To my surprise one shock could go into bounce and rebound easily, and the other would hardly move! So I moved the drive gear full anti clockwise on both shocks and the opposite happend, one would now go soft and the other hard. WTF !

Sooooo the shock that I had replaced the broken gear on, I took the roll pin out and removed the gear. I turned the shaft 180 degrees and tried the bump/rebound again. And this time the shocks were both the same. I turned the shaft 180d again and they were then opposites. Seems like when I replaced the broken gear, I played with the shaft and put the gear on 180 degrees out on the shaft.

Now Ive seen several comments about not having to worry where abouts the position of the shaft is, just put the gear on and its done. But in my case this is not true. The shock valve adjusting shaft has to be at the correct angle to get the correct damping, not as I found - 180 degrees out. So the car was driving with one shock soft and the other side hard as and hardly moving.

Its transformed the car now. Breaking loose at the rear end and moving to the left is gone and the car just stays straight. Im certainly able to feel the ride difference now. Trap for young players perhaps? Just thought Id add my findings to the forum.

Regards
Bruce.
91 ZR1 #1781

[DRM500RUBYZR-1]

Well done!!!



Thanks for the tip!

Marty

[Roadster]

I agree, good to know for future reference....also print and add to the file

[ghlkal]

Nice work.

Thanks for taking the time to post this

[RussMcB]

Thanks, Bruce. 'Good on ya'. :-)