Mk IV IRS Question

[Railroad]

While looking over my installed Mk IV IRS, I noticed the upper control arm, forward leg was touching a diagonal brace of the frame. I looked at pic #20 of the instructions and it shows the same. With the suspension in the extended position it will contact the brace. The PS has about 1/4 inch clearance, but the suspension adjustments have not been set. My question is, will this arm bottom out on the frame when the suspension reaches full extension? The arms do not have much travel before contact. Probably worrying about nothing,

[edwardb]

For your 2015 IRS (always important to mention since both the previous and 2015 version are used on the Mk4 and they're very different) the suspension adjustment itself (camber and toe) won't change the position of that arm. But the forward leg of the upper control arm only gets close to the frame when at full droop. Do you have your shocks installed yet? Those will limit the travel. Both sides on mine are above the frame at full droop with the shocks installed.

[Railroad]

Thanks for the reply. Yes I do have the latest version of the IRS on the Mk IV. I need to figure out how to add that to my post. I do have the shocks installed, but do not have the springs loaded. The DS does not seem to have as much travel before it contacts the diagonal brace. I should have put an angle finder on it and recorded the degree of droop when it makes contact. The tire travel may be several inches , but the control arm seems to be too close for much travel from horizontal. I was going to post the pic of the instruction sheet, but too much work for me to figure out this late. I thought I might have gotten some parts mixed up, but everything seems to check out. I might measure the attachment points of the diagonal brace and see if it compares to your frame. Thanks again,

[Duke]

The arm will be about 1/8" or so from the frame with the shocks on and suspension fully unloaded. See photo below for how mine is sitting right now. There's a chance it will hit if you aren't running a rear sway bar, but short of getting airborne you should be fine once the rear suspension is compressed under the load of the car.

http://i111.photobucket.com/albums/n139/r454duke/Cobra/11-22-2016%208-07-16%20PM.jpg (http://s111.photobucket.com/user/r454duke/media/Cobra/11-22-2016%208-07-16%20PM.jpg.html)

[Railroad]

That looks like my right side, the left being a little closer. Something I will be watching after getting airborne.
Thanks for replying.

[edwardb]

Duke beat me with pics, but here's a couple of mine FWIW. These are at full droop (wheels off, chassis on jack stands), shocks attached, sway bar attached. I have about 1/4-inch clearance on each side.

Passenger side:

http://i867.photobucket.com/albums/ab234/edwardb123/Factory%20Five%2020th%20Anniversary%20Mark%204%20R oadster/Independent%20Rear%20Suspension/IMG_0805_zpsdsxnlrvq.jpg (http://s867.photobucket.com/user/edwardb123/media/Factory%20Five%2020th%20Anniversary%20Mark%204%20R oadster/Independent%20Rear%20Suspension/IMG_0805_zpsdsxnlrvq.jpg.html)

Driver side:

http://i867.photobucket.com/albums/ab234/edwardb123/Factory%20Five%2020th%20Anniversary%20Mark%204%20R oadster/Independent%20Rear%20Suspension/IMG_0802_zps1mbmrbto.jpg (http://s867.photobucket.com/user/edwardb123/media/Factory%20Five%2020th%20Anniversary%20Mark%204%20R oadster/Independent%20Rear%20Suspension/IMG_0802_zps1mbmrbto.jpg.html)