Ohlins Coilover Setup

[FSUZ33]

I took measurements of the loaded spring lengths before I started pulling them apart. That, compared to the unloaded spring lengths would get you a 'Sakebomb' preload measurement, however that may change based on spring rate...idk Also, I don't know IF millimeter precision is important. Generally, 5mm from tight is considered perfectly fine.

What's the thread pitch of the front upper top plate bolts? Guess I should replace those now. I assume that OEM plate should stay there.

 

[RSS]

1.25 is the thread pitch you want. I went with 35mm.

I remember you saying you measured everything out, I hope they get back to me quicker Then not on this. I want to finish up under the car with all but the end links. I will do those once stance is set and aligned. interior sometime next week.

 

[FSUZ33]

M6 or M8?...or M10? Not looking at them but they can't be M6.
I did ONLY ask for the pitch...my bad.

 

[RSS]

lol crap I can’t remember, too many numbers running through my head I want to say 10mm.

I do feel like a dumb _ss though. Apparently I totally missed any preset in my set up. I am running Apex wheels with different offsets so nothing is preset. Need to do all the set up ie: free length/preload myself based off tire wheel combo and desired preload. So back to the beginning, but at least the SPL parts are on. LOL

My son (whom I refused to ask for help and teaches this stuff) reply was simple and ruthless. “How are you fenders” Oh My how things reverse as your children age.

 

[FSUZ33]

Ohlins recommends 7mm of preload for the current US-spec R&T kit.

Rear is simple. Measure from perch to perch with the bottom perch hand tight. Then tighten the bottom perch to shorten the stack 7mm.

Front with air cups is harder as I’m assuming it’s difficult to measure the spring/stack with the bottom perch hand tight (little to no clearance inside the cup to measure accurately).

Two options in my head For the front.
- 1. Temporarily lock the bottom sleeve/mount, maybe a little tighter than hand tight. Set the lower perch to hand tight and measure the gap between the mount lock nut and lower perch. Tighten the lower perch until that gap is +7mm.
- 2. I haven’t confirmed this but it’s possible the thread pitch of the shock is 1mm, meaning one rotation of the perch moves it 1mm. If so, hand tight, then another 7 rotations. Even if the thread pitch thing is true It seems like #1 would be the better/easier solution.