Comprehensive Steering Information Thread

[YoitsTmac]

Not enough to not trip up DSC. It's very mild difference - M to non M (pivot point to steering tie rod leverage point. About 5-10% IIRC)

[maupineda]

Does the coupe have the M3 or non-m e46 steering ratio in the knuckles? M3 slower might be better in this case.

From the data on this thread, the M coupe has the same knuckle ratio. The distance between the CA ball joint to the tie rod is 130mm on both.

[Bry5on]

From the data on this thread, the M coupe has the same knuckle ratio. The distance between the CA ball joint to the tie rod is 130mm on both.

Yeah I’m confused as most literature seems to have the m coupe at 13.7:1 (same as non-m ratio with 150mm/rotation rack) which is 126mm ball joint to tie rod from my scans. M3 is 130 as you’ve posted above. About 3% quicker on center

[chris719]

I just bought the black tag for my coupe. It will be interesting to see how it fares for road use with a more normal stocking wheel & tire setup

Did your original rack have a problem, or you just wanted something quicker? I noticed my roadster has a silver tag rack vs green on the coupe, which I guess they all do? All the pics of the part number 32137836844 have a silver tag.

[maupineda]

Did your original rack have a problem, or you just wanted something quicker? I noticed my roadster has a silver tag rack vs green on the coupe, which I guess they all do? All the pics of the part number 32137836844 have a silver tag.

Hi Chris, nothing wrong with my rack at 53k miles, I just want the quicker rack. The MCoupe is not bad, but I have a Tesla Model 3 which has much faster steering and I find it better for my liking, the M requires way more lock in the winding roads I go to.

people say it can get twitchy, but I don’t buy it. I used to race karts with 1:1 ratio.

[maupineda]

I got my rack this weekend and started installing it. The rack seems to be a high quality item, the exterior housing is almost a 1:1 replica of the OE design. Fitment is perfect and all clearances are same as the OE item

the only negative I have with it is the pinion dust cap, which is a very flimsy item, but the vendor I got it from was very nice and sent me an OE hard plastic one for a factory like setup.

Now the bad, which is nothing to do with the rack but rather bad luck as the top of the pinion seemed to have been damaged causing the intermediate shaft yoke to not slide in, so I had to remove the rack and I am in contact with Lucas and the vendor to define the next steps.

i will post photos of it and will document the details of the Z4M rack vs the black tag.

[02'topaz]

I’ve been running the LSPR black tag rack since last season and initially had no major issues other than the pulsation described by other users at full lock. This honestly didn’t affect the function of the car for me, but given the fix was a custom PS line from Lucas, I went ahead and installed it.

Attended my first track day since the new line went in, and had major issues with presumably boiling the fluid. After 1.5 laps on a track with short straights and lots of corners, began losing power steering. As the car cooled, things returned back to normal. Tried to push another lap just in case the system had not been bled properly, but same issue, with whining from the PS pump and near total loss of power steering.

Street driving is absolutely normal and the pulsation of course is gone. But I have traded a problem that didn’t bother me for a car that is no longer usable on track. Running D3 atf per Lucas’ recommendation and not Chf-11s.

Naturally one would think it’s time for a cooler, but why was this issue not present before with the same rack/OEM line at the same track on two occasions and only now with the new custom line?

PS reservoir was replaced when lines were refreshed so a clogged filter cannot be the issue.

Anyone else having this issue and have any insight on how to rectify other than potentially going back to the OEM line and just dealing with the pulsation (as long as it longterm doesn’t fry my pump).

Shitty way to start the season today but thankfully didn’t bin the car when losing PS completely into a hot corner…