Fitment Issues with MPHAS

[erictrainer]

Am I the only who one who is having an issue fitting a 265/35/19 tires (P4S) on 19x9.5et22wheels with an MP Has in the front? The tire is rubbing on the spring perch. Yes the car currently sits pretty low.

I bought my M4 with a gen1 KW HAS kit and when I tried fitting my new wheels 19x9.5et22 with the tires above I was getting rubbing. My understanding was that with the MPHAS I wouldn't have the same issue.

So after buying a brand new MPHAS and another trip to the shop I'm still having basically the same issue. Not sure it was any better. I thought I did my homework.

What are my options now? I never realized how tight it was in the front after having zero issues with my 305/30/19 on stock height. I think I'm just going back to stock and solving all my fitment issues. Not sure what else to do... can someone please give me feedback?

Will something like a B16 setup give me more clearance? Help please!

[knightarmor]

What's the ride height/location of you front perch. It may be set too low. I run 265/35-19 AD08R which is a huge tire on 19x9 +20 and have zero problems and at least 1/4" or more of clearance

[M3nmotion18]

Originally Posted by knightarmor

What's the ride height/location of you front perch. It may be set too low. I run 265/35-19 AD08R which is a huge tire on 19x9 +20 and have zero problems and at least 1/4" or more of clearance

As Knightarmor said, it may be set too low. But, the shop didn't check the clearance after the installations? My MP HAS is set little lower than the recommended ride height and never had any issue, Thanks to Knightarmor!

[erictrainer]

Originally Posted by M3nmotion18

As Knightarmor said, it may be set too low. But, the shop didn't check the clearance after the installations? My MP HAS is set little lower than the recommended ride height and never had any issue, Thanks to Knightarmor!

Don't even get me started on the shop. So the shop guy comes and tells me it's rubbing... it didn't occur to me that yeah he should raise it and play with it until it works. I assumed that like the KW gen1 this wouldn't work because the tolerances were so tight anyway. The attitude was like yeah it rubs it's not going to work...SMH.

I also just assumed that if he raised it then it would defeat the purpose and I'd be at stock height. Its my first go around dealing with drops and suspension and it has been an expensive lesson.

I still don't know what to do... whether sell the MPHAS and go back to stock and springs. Is it correct to assume this will give me more clearance inside? Or just get a full coilover set.

[knightarmor]

You cannot get to stock height with the MPHAS set at the highest setting. From your picture it's clear it is set too low. Raise it up until it clears, and even then that is going to be way below the recommended height.

See the attached photo. I recommend starting here and slowly work your way down.

[CanAutM3]

Originally Posted by erictrainer

Don't even get me started on the shop. So the shop guy comes and tells me it's rubbing... it didn't occur to me that yeah he should raise it and play with it until it works. I assumed that like the KW gen1 this wouldn't work because the tolerances were so tight anyway. The attitude was like yeah it rubs it's not going to work...SMH.

I also just assumed that if he raised it then it would defeat the purpose and I'd be at stock height. Its my first go around dealing with drops and suspension and it has been an expensive lesson.

I still don't know what to do... whether sell the MPHAS and go back to stock and springs. Is it correct to assume this will give me more clearance inside? Or just get a full coilover set.

According to BMW documentation, MPHAS at the highest setting is 10mm lower than stock.

Are you sure your wheels are ET22?

Worse comes to worse, you could simply add a spacer to improve inboard clearance...

[knightarmor]

Originally Posted by CanAutM3

According to BMW documentation, MPHAS at the highest setting is 5mm lower than stock.

Are you sure your wheels are ET22?

Worse comes to worse, you could simply add a spacer to improve inboard clearance...

That's gonna be a negative on 5mm lower than stock being the highest, the fronts we set at the highest on one of our ZCP's and it's about 3/4"+ lower than stock unsettled. Never tried the rears at the highest setting.

[CanAutM3]

Originally Posted by knightarmor

That's gonna be a negative on 5mm lower than stock being the highest, the fronts we set at the highest on one of our ZCP's and it's about 3/4"+ lower than stock unsettled. Never tried the rears at the highest setting.

Indeed, after double checking it is 10mm in front (5mm is for the rear on the M4), I fixed my OP. But that's nowhere near the 3/4"+ (19mm) you mention...

[knightarmor]

Originally Posted by CanAutM3

Indeed, after double checking it is 10mm in front (5mm is for the rear on the M4), I fixed my OP. But that's nowhere near the 3/4"+ (19mm) you mention...

Yea that's incorrect for the front and I doubt raising the rear could make that much of an impact to the front height but you never know... I'd really be curious what OP's car looks like in the front with the spring perch set to where he's got it. That's got to be dumped .

[erictrainer]

This is what it looks like with my KW and yes can confirm my new wheels are Titan 19x9.5et22. I cannot do spacers because it will rub on the outside fender...I did try that option.

[erictrainer]

And these are the pics from the first time I tried mounting with the KWHAS setup

[knightarmor]

Yeah you literally just need to raise the spring perch a bit. About 20mm from looking at your pic and you'll clear no problem. Like I mentioned above start with the dimension I posted and work your way down. Give yourself at least 1/4" of clearance gap between tire and perch and you're good to go. Just had my f80 up in the air this morning and I have over 1/2"+ gap between my tire and the perch.

I also in the past have test fitted a 19x9.5 with a +22 offset and 275/35-19 up front and had a good 1/4" gap.

[fiveohwblow]

Originally Posted by erictrainer

This is what it looks like with my KW and yes can confirm my new wheels are Titan 19x9.5et22. I cannot do spacers because it will rub on the outside fender...I did try that option.

What size spacer did you try? I ask because I had terrible rub on my track car after the race alignment and coils did a 3 mil spacer to just provide enough clearance. I cant imagine 3 mil would cause your tires to contact your fender and if so, the only solution you should look into is raising it a bit or a combo of the both. if you are in fact that close on tolerances, you are one hard bump or unexpected pot hole away from a nice fender replacement...

[erictrainer]

Originally Posted by fiveohwblow

What size spacer did you try? I ask because I had terrible rub on my track car after the race alignment and coils did a 3 mil spacer to just provide enough clearance. I cant imagine 3 mil would cause your tires to contact your fender and if so, the only solution you should look into is raising it a bit or a combo of the both. if you are in fact that close on tolerances, you are one hard bump or unexpected pot hole away from a nice fender replacement...

5mm...et22 on a 9.5 is pretty aggressive by itself

[erictrainer]

Originally Posted by knightarmor

Yeah you literally just need to raise the spring perch a bit. About 20mm from looking at your pic and you'll clear no problem. Like I mentioned above start with the dimension I posted and work your way down. Give yourself at least 1/4" of clearance gap between tire and perch and you're good to go. Just had my f80 up in the air this morning and I have over 1/2"+ gap between my tire and the perch.

I also in the past have test fitted a 19x9.5 with a +22 offset and 275/35-19 up front and had a good 1/4" gap.

Thanks man really appreciate the feedback. Now all I'm wondering is whether my KWHAS would've worked just by raising them too. I think I might give it a try. Although it does appear that the MP perch sits a bit higher.

[knightarmor]

Originally Posted by erictrainer

Thanks man really appreciate the feedback. Now all I'm wondering is whether my KWHAS would've worked just by raising them too. I think I might give it a try. Although it does appear that the MP perch sits a bit higher.

Yea Hard to tell from the angle of the pics on the KW's, but if it's anything similar to how you have the MPHAS set you would have been okay just raising it up a bit.

[TopJimmy]

I'm on MP-HAS with 9.5ET25 in front on RE-71R 265/35/19. Maybe you can keep your drop and add thin wheel spacers. If you run 295 or 305 out back on 10.5ET35 it should still look right.

[M3SQRD]

Originally Posted by TopJimmy

I'm on MP-HAS with 9.5ET25 in front on RE-71R 265/35/19. Maybe you can keep your drop and add thin wheel spacers. If you run 295 or 305 out back on 10.5ET35 it should still look right.

Adding a spacer makes the wheel offset more aggressive (pushes wheel out farther); e.g., 9.5et22 + 5 mm spacer = 9.5et17

[TopJimmy]

Originally Posted by M3SQRD

Adding a spacer makes the wheel offset more aggressive (pushes wheel out farther); e.g., 9.5et22 + 5 mm spacer = 9.5et17

That's all true. It's a difficult choice of less drop, or adding a spacer, or less camber, or different tires.

[AleksDeRussian]

Glad I saw this thread since I'm about to order MP HAS and have a similar tire set up. What would be the lowest you could run with 265/35 and 305/30 and have no rub?

[M3SQRD]

Originally Posted by TopJimmy

That's all true. It's a difficult choice of less drop, or adding a spacer, or less camber, or different tires.

I’d recommend running less of a drop because the suspension travel before hitting the bump stops is somewhat limited on the M3/4. You definitely do not want to be riding on the bump stops the majority of the time.

Camber doesn’t help you add clearance because the strut and tire relative clearance doesn’t change with camber - the strut, steering knuckle and hub, brakes, and wheel all rotate as an assembly.

[TopJimmy]

I just went out to do measurements and see if things need any adjustments the day after install.

- Both front adjusters are at 8 threads.
- Drivers front has 1/4in clearance to the inner tire. (room for 2 stacked paint sticks)
- Passenger front has 1/8in clearance in same spot. (1 paint stick just fits, not snug but no room to spare)

For looks I wish I could come down another half inch in the fronts but the adjusting collar would rub the tire. I guess I'll have to give it time and see how the springs settle.