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      03-13-2017, 01:28 PM   #23
Jevi Javi
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Quote:
Originally Posted by Twt View Post
Installed these last month and then corner balanced. Ran at Sebring and Road Atlanta...very happy with this set up. I had run RA before install and found the car had much less body roll and quicker transitions.....at Sebring the car was planted but it did not "bounce" on the rough sections. I drove it back to Atlanta from Sebring and it was very comfortable. Overall this was a great upgrade with no real downside.
If you have data...
By how much did your lap times improve at these tracks with the MP coilovers??
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      03-14-2017, 07:50 AM   #24
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It's hard to give an exact number since I changed wheels and tires , but I can estimate from my data that the car was about 2 sec faster at Road Atlanta due to the suspension.Remember that these allow you to lower the car , so improving the CG on a big car will really help!
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      03-14-2017, 08:46 AM   #25
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anybody know what the spring rate is on these coilovers?
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      03-14-2017, 10:16 AM   #26
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Quote:
Originally Posted by Jevi Javi View Post
anybody know what the spring rate is on these coilovers?
40% stiffer than stock, don't know the actual number though.
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      03-15-2017, 08:26 AM   #27
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Quote:
Originally Posted by SeanWRT View Post
40% stiffer than stock, don't know the actual number though.
what are the spring rates on stock?
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      03-15-2017, 07:59 PM   #28
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Quote:
Originally Posted by Black Gold View Post
Quote:
Originally Posted by SeanWRT View Post
Well...as I gave it more miles, I clearly feel it's bouncier than stock. I am thinking if I should dial one or two clicks toward to soft.

BTW, are the right and left rear shocks interchangeable? I remember there was no marking left or right (there were marks on front shocks though) so my mechanic and I couldn't tell the difference when installing them.
biggest reason is that you are running it 5mm lower than recommended

when a suspension system is designed, the shock body length and valving is specifically designed for an specific ride height. it is impossible for a suspension setup to be ideally set up for multiple ride heights

when you run the car lower than it is designed for, the shocks are precompressed at static ride height, meaning that you have already reduced the shock travel by 5mm in your case. this both reduces travel and has the car operating at a different stiffness than it is designed for as the shock is already compressed when it is not designed to be, thus the valving is off.

it will ride and handle better at the recommended height.
Hey man you've made a good point and I appreciate that. But in my case I think I am still within the KW design height range, which is a little different than say pairing lowering spring with factory shock...

In full disclosure, as spring felt settled, I already adjusted the height a little bit. Now it's 600mm at rear(recommended) and 598(3 mm higher than recommended), a less nose down setup.

A picture below I just took:
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      03-16-2017, 10:14 PM   #29
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I just found out something about height adjustment that is very confusing.

Me and my friend was at the mod shop yesterday installing KW V3 on his Z4. When adjusting the height, the mechanic referenced the KW installation document, which specifies adjustment ranges measured from spring. It had good photos to explain the distance measurement A. See picture 1 below.

I didn't remember I had anything like that to reference when installing my MPS. Instead BMW installation instruction told us to measure vehicle height from the lower rim edge vertically to the wheel arch, see picture 2.

I felt something could be wrong, so I immediately checked my BMW document page by page and actually found the "adjustment ranges" from spring in the TUV approval section. See picture 3.

BMW MPS Adjustment Range (without photo explanation) are:
Front: Distance from the spring rest to the nearest fastening screw. 165~185mm
Rear: Distance from contact point of the car to the adjustable spring perch. 29~44mm

KW V3 Adjustment Range (with photo explanation as distance A) are:
Front: Lower fastening screw to spring contact area. 170-195mm (Z4)
Rear: Lower fastening screw to spring contact area. 15-35mm (Z4)

Assuming BMW and KW are talking about the same distance A, which we're unsure of because BMW doesn't have photo explanation, my result is 159mm at front and 22mm at rear, or 6~7mm lower than minimum.

What confuses me is that my wheel-to-fender distances (598 front, 600 rear, 75*2KG loaded) are already higher than BMW recommendation, which has the photo explanation and is the standard we're instructed to follow.

BMW recommendation should be somewhere halfway between max and min of spring adjustment range, which should be 175mm (165-185) front and 39mm (29-44, rear being 5mm higher as designed) rear. I would be sitting 16~17mm higher than now, which will be basically stock height, should I follow 175 and 39.

At the end of day, we didn't do any adjustment without authoritative confirmation. But I am concerned it will hurt shock if we don't do it right.

How did you adjust the height? Anyone chime in?
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      04-05-2017, 09:54 AM   #30
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Quote:
Originally Posted by Twt View Post
It's hard to give an exact number since I changed wheels and tires , but I can estimate from my data that the car was about 2 sec faster at Road Atlanta due to the suspension.Remember that these allow you to lower the car , so improving the CG on a big car will really help!

Are you running camber plates too? If so which ones? How is your tire wear? How much camber do you have dialed in? I assume there is no camber adjustability without plates?
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      04-05-2017, 03:19 PM   #31
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Contemplating between M Performance suspension or the Ohlins, which one is better for the money.
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      06-04-2017, 03:38 PM   #32
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Has anyone found some settings to dial out mid-corner understeer with the m coilovers? I notice while the car has great turn in, it pushes just a bit in corners ( off throttle ), wondering if it's possible to dial that out with some rebound/compression tweaks on the performance coilovers.
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      07-13-2017, 06:25 AM   #33
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Hi

Is it the lower knob on the damper that sets rebound ?
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      07-13-2017, 07:25 AM   #34
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Quote:
Originally Posted by SeanWRT View Post
Long story short, the decision to transform my X2M into M2 using MP coilover was made last week when I felt great at Casino Galaxy Macau.

Today the MPS arrived and was installed. I used the recommended shock setting but was 5mm lower than default at both ends.

I did 100km today in city with that configuration. Less body roll, dealing road imperfections well, only slightly bouncier at speed hump, not much of a difference in firmness overall, which is to my surprise. I'll do some more tests to find out.

Car looks much better lowered. See it compared side by side to a KW CS lowered m4 in the picture attached below. Forgive me not taking a picture from the side, I'll do that soon though.

One question, what's the benefit performance wise from having front end 5mm lower than rear?

Share your setting and experience please.
HI,You made measurements before installing the MP suspension? I'm interested in how much it is in front and back in the stock?
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      07-13-2017, 08:15 AM   #35
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Quote:
Originally Posted by Leonidm2 View Post
Quote:
Originally Posted by SeanWRT View Post
Long story short, the decision to transform my X2M into M2 using MP coilover was made last week when I felt great at Casino Galaxy Macau.

Today the MPS arrived and was installed. I used the recommended shock setting but was 5mm lower than default at both ends.

I did 100km today in city with that configuration. Less body roll, dealing road imperfections well, only slightly bouncier at speed hump, not much of a difference in firmness overall, which is to my surprise. I'll do some more tests to find out.

Car looks much better lowered. See it compared side by side to a KW CS lowered m4 in the picture attached below. Forgive me not taking a picture from the side, I'll do that soon though.

One question, what's the benefit performance wise from having front end 5mm lower than rear?

Share your setting and experience please.
HI,You made measurements before installing the MP suspension? I'm interested in how much it is in front and back in the stock?
Both the same 620mm
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      07-13-2017, 09:10 AM   #36
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Quote:
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Both the same 620mm
How is the scraping situation at 598 front and 600 rear?
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      07-13-2017, 09:14 AM   #37
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Quote:
Originally Posted by SeanWRT View Post
Both the same 620mm
This is with the download of 2x75 kg?I ask because i installed Ohlins R/T for bmw m2 and dealer bmw forgot to measure the stock parameters.I put on the recommendations of Ohlins settings and i got 620mm in front and 615mm in back.You think that this is strange?
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      07-13-2017, 09:59 AM   #38
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Quote:
Originally Posted by Leonidm2 View Post
Quote:
Originally Posted by SeanWRT View Post
Both the same 620mm
This is with the download of 2x75 kg?I ask because i installed Ohlins R/T for bmw m2 and dealer bmw forgot to measure the stock parameters.I put on the recommendations of Ohlins settings and i got 620mm in front and 615mm in back.You think that this is strange?
620mm is half tank gas without driver and passenger.

With 75kg*2, it would be approximately 3mm lower at front and 4-5mm at rear.
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      07-13-2017, 10:04 AM   #39
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Quote:
Originally Posted by qtong View Post
Quote:
Originally Posted by SeanWRT View Post
Both the same 620mm
How is the scraping situation at 598 front and 600 rear?
I am not sure of the meaning of "scraping" but no issue so far with 598 and 600mm.
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      03-18-2018, 10:17 AM   #40
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Quote:
Originally Posted by Twt View Post
Installed these last month and then corner balanced. Ran at Sebring and Road Atlanta...very happy with this set up. I had run RA before install and found the car had much less body roll and quicker transitions.....at Sebring the car was planted but it did not "bounce" on the rough sections. I drove it back to Atlanta from Sebring and it was very comfortable. Overall this was a great upgrade with no real downside.
Was this with the recommended BMW setting in height, rebound, etc...?
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