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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > M3 Steering Rack Swap



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      07-07-2014, 08:59 PM   #23
vasillalov
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So I did a bit more research and it turns out that the power steering pumps between the M3 and the 335i are different and they most probably have different pressure and flow characteristics. I would not be surprised if the M3 steering rack mounted on our cars will not have enough pressure and the steering may be too heavy.

... more research is needed.
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      08-31-2014, 12:54 PM   #24
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Quote:
Originally Posted by vasillalov View Post
So I did a bit more research and it turns out that the power steering pumps between the M3 and the 335i are different and they most probably have different pressure and flow characteristics. I would not be surprised if the M3 steering rack mounted on our cars will not have enough pressure and the steering may be too heavy.

... more research is needed.
I am looking st doing this, Any more info?
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      08-31-2014, 01:48 PM   #25
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Quote:
Originally Posted by robc1976 View Post
I am looking st doing this, Any more info?
Here's a guy with a 1 Series that has done the swap. http://www.babybmw.net/viewtopic.php?f=29&t=62766
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      08-31-2014, 04:50 PM   #26
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Quote:
Originally Posted by swagon View Post
Here's a guy with a 1 Series that has done the swap. http://www.babybmw.net/viewtopic.php?f=29&t=62766
Guess I will do it, only a 1 hour job lol!
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      09-01-2014, 12:52 PM   #27
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God I wish this swap worked on my xdrive. It appears it mounts differently. I would pay large sums of cash to have a better steering ratio with more sensitive precise steering feel off center. If you guys think the 335i steering is dull you should drive an xdrive. Im so bummed.
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      09-04-2014, 08:56 AM   #28
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did it on my 335i

be aware that the centring tab on the steering column pinion has to be removed, otherwise you cant line up the steering wheels and the rack in the centre position
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      09-04-2014, 09:30 AM   #29
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Quote:
Originally Posted by marconi118 View Post
did it on my 335i

be aware that the centring tab on the steering column pinion has to be removed, otherwise you cant line up the steering wheels and the rack in the centre position
You talking about where it pushes in abd is secured into housing?
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      09-04-2014, 09:58 AM   #30
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at the rack where it connect so the steering column

a black plastic tab imposes the centring of it, but at least in my istall US car, the steering wheel is then 30° off to the left.

Had to remove the tab and centre it correctly

it seems that on UK cars this is not the case
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      09-04-2014, 10:03 AM   #31
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Quote:
Originally Posted by marconi118 View Post
at the rack where it connect so the steering column

a black plastic tab imposes the centring of it, but at least in my istall US car, the steering wheel is then 30° off to the left.

Had to remove the tab and centre it correctly

it seems that on UK cars this is not the case
Will look at mine when it comes in. When you cut it you Heber Noway to center it do you? Also if I use my tie-rods and remove them at the large nut (inner tie rod) and not mess with adjustment would I still need a alignment.
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      09-04-2014, 10:14 AM   #32
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The inner tie rod of the 335i has different part number than the M3 one so no idea if you can fit the M3 rack


the plastic tab is part of a black dust cover on the rack axle. you cut only the tab from the cover.

the cover itself has an arrow on the edge, you have to line it up to a mark in the aluminium if the rack, then it is centred.
centre the steering wheel and then insert the steering column in the rack.

Verify if the arrow is still on the mark on the rack and that the steering wheel is centred...
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      09-04-2014, 10:17 AM   #33
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Plugged a PWM controller to the servotronic plug, you can nicely soften the steering, but if soft at low speed, it becomes super soft after 40Km/h


It needs a sort of control to engage it only still or at low speed, maybe a JB4 ISO could send a signal on one output pin of the PIC when speed is more than 40 Km/h

Rob maybe you can ask terry to code that it should be really easy for him
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      09-04-2014, 11:27 AM   #34
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Quote:
Originally Posted by marconi118 View Post
The inner tie rod of the 335i has different part number than the M3 one so no idea if you can fit the M3 rack


the plastic tab is part of a black dust cover on the rack axle. you cut only the tab from the cover.

the cover itself has an arrow on the edge, you have to line it up to a mark in the aluminium if the rack, then it is centred.
centre the steering wheel and then insert the steering column in the rack.

Verify if the arrow is still on the mark on the rack and that the steering wheel is centred...
My buddy said if steering wheel is centered before removal tab doesn't need altering. I will ask Terry about the coding!
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      09-04-2014, 11:37 AM   #35
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concerning the tie rods no problem

but the tab will cause you problems, the steering wheel will be centred but the rack will be out 30° you will notice it on this arrow on the plastic cap it will not line up with the mark.


Have a look on the 335i rack there is also an arrow that faces a mark when centred
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      09-04-2014, 12:49 PM   #36
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Quote:
Originally Posted by marconi118 View Post
concerning the tie rods no problem

but the tab will cause you problems, the steering wheel will be centred but the rack will be out 30° you will notice it on this arrow on the plastic cap it will not line up with the mark.


Have a look on the 335i rack there is also an arrow that faces a mark when centred
Do just shave tab and center it with line?
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      09-05-2014, 08:17 AM   #37
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the black plastic cap that prevents dust on the axle of the rack has this tab, it it quite thick and has a kind of lip. Just cut it flush with a small metal saw



have a look in this picture http://shop.avw-autoverwertung.de/im...es/28995_2.jpg
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      09-05-2014, 08:38 AM   #38
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Quote:
Originally Posted by marconi118 View Post
the black plastic cap that prevents dust on the axle of the rack has this tab, it it quite thick and has a kind of lip. Just cut it flush with a small metal saw



have a look in this picture http://shop.avw-autoverwertung.de/im...es/28995_2.jpg
Oh! I thought you where saying cut off the part that slides in, dremel will take care of this!
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      09-05-2014, 01:43 PM   #39
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I can't Saree why I would have trim, M3 has the identical tab as OEM? If the tab is same it should fit.
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      09-09-2014, 05:00 AM   #40
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the tab is the same, but the position (angular) is different.

centre both the 335i and m3 racks. the small arrow opposite to the tab on the plastic ring has to face to a mark on the rack frame.

then compare the position of the tabs, one will be 30° away compared the other.

Cut the tab so that the steering column can be inserted at a different angle than the one imposed from the tab.
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      09-09-2014, 08:58 AM   #41
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Quote:
Originally Posted by marconi118 View Post
the tab is the same, but the position (angular) is different.

centre both the 335i and m3 racks. the small arrow opposite to the tab on the plastic ring has to face to a mark on the rack frame.

then compare the position of the tabs, one will be 30° away compared the other.

Cut the tab so that the steering column can be inserted at a different angle than the one imposed from the tab.
gotcha! Just to confirm also. I can use both my inner/outer tie-rods from my E90 and out on M3? I measured mine and M3 rack and they are identical in length not including tie-rods.
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      09-09-2014, 09:02 AM   #42
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Yes the the rods are the same
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      09-09-2014, 08:41 PM   #43
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Quote:
Originally Posted by marconi118 View Post
the tab is the same, but the position (angular) is different.

centre both the 335i and m3 racks. the small arrow opposite to the tab on the plastic ring has to face to a mark on the rack frame.

then compare the position of the tabs, one will be 30° away compared the other.

Cut the tab so that the steering column can be inserted at a different angle than the one imposed from the tab.
I do not see a mark the arrow is supposed to be lined up with on M3 rack?
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      09-09-2014, 08:47 PM   #44
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Has to be this mark by numbers
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