[rothwem]

Originally Posted by Bimmer-Bob

Does anyone know anything about this Servotronic retrofit kit (p/n 32106796480)? I'd love to do this swap as well, but I'm not sure I want to deal with unassisted steering at parking lot speeds...

I'm pretty sure that's only for the electric power steering models.

[whosdady]

This is all good stuff! Please keep it coming...

[berns]

Did this swap today, but I'm getting a fault for the DSC from the steering angle sensor right now...

[Griff500]

Do you like the swap berns?

Anyone worked out how to control the assistance as per the 1M/M3?

[robc1976]

I have a full M3 rack with brand new tie-rods for sale in my part out thread if interested. Its one of my favorite mods.

[berns]

Originally Posted by Griff500

Do you like the swap berns?

Anyone worked out how to control the assistance as per the 1M/M3?

The quicker rack definitely makes the car feel alive, you're now totally in tune with it, and it accentuates other things, like on my car, I've put a lot of time into suspension and chassis tuning, so yeah, I'm happy. I will say, though, I drive daily, and most of the time it's through annoying LA city streets at low speeds. The steering is definitely heavier than I'd like it at low speeds, especially in parking lots etc... Hopefully one day we can add a feature and wiring to JB4 to control the assistance.

The shop doing my install seems to have somehow broke my steering angle sensor while installing, so I've still got to get that sorted.

[andrey_gta]

Originally Posted by marconi118

Just purchase on ebay a 12v PWM electric motor speed controller
http://www.ebay.de/itm/381099085157?...%3AMEBIDX%3AIT

connect the output to the rack connector and the input to a +12v key switched

Put an Ampermeter in series on one of the wires that goes to the rack
ensure that the regulating potentiometer is at lowest setting

power on the car, slowly increase the pot until you read 0.7A, this is the max soft position, NEVER EXCED this position or you will fry the solenoid inside the rack!!!!!

now you can variate from full stiff 0A to full soft 0.7A

I requested to integrate in the JB4 an output dependant to the car speed to switch automatically from soft to normal, but never had an answer

you could use a switch for manoeuvre / cruise electricians could do that easily

Thank you!

Forgive me, but I dont have an electonics background so my self and maybe others would like to know if there a way to have a more fool proof way to do this?
I am sure I am not alone to feel nervous about this DIY electronics with a potential to ruin the solenoid in an expensive rack.

Is there a way to get a part that already pre-set to the maximum Amperage set at 0.5A? That way adjustment is from 0.0 to 0.5A only.

[AWDBooSTIn90]

Any update on this? Would love to add M3 steering rack and get the servotronic working on my E92...

If it gets its signal from the JBE on the 1M then it must be bc the N54 DME didnt have an output for this? So instead BMW used the JBE to vary the output to the rack? Just some thoughts.. The M3 was set to have servotronic on all cars as standard so it would make sense to incorporate this into the M3 DME and therefore into the main engine bay wiring harness....

Could try hooking up the wires to the JBE, add servotronic to the VO, code car. And hook wires up to a volt meter, take for a drive. Observe voltage based on speed. Then hook up the two wires to an ammeter and watch the signal based on speed of car. It seems like the current sent to the steering rack is what is being changed and PWM is being used most likely to achieve desired Amperage or possibly Voltage.

This way we can test and see what happens when the wiring addition is made to the JBE and the VO and coding the same as the 1M is applied to the E90 and see if things work out. And this way you have no way of damaging the M3 steering rack if this is not the right approach... jB4 is not the way to go about this in my opinion, but could be an easier solution if the stock bmw system is as simple as varied output soley based on vehichle speed...

And like its been said before if installing an M3 steering rack:

If your using a NON-M3 knuckle/upright then you need 335i inner tie rods

IF an M3 upright/steering kuckle and M3 control arms are installed, standard M3 inner and outer tie rods should be used.

That seems to be the concencus. Now i dont know if the m3 steering intermediate shaft being swapped over, to non-M, could change this. Make sure to measure and observe steering shaft angles for binding, etc...

[whosdady]

The 335i is really missing out imho with its current rack. The m3 rack really transforms the car. Unfortunately at lower speeds, the m3 rack is almost unbearable.

I really hope someone comes up with a viable solution to use the m3 rack...

[AWDBooSTIn90]

All we need to do is compare the 1M to the 335i and see where the wiring needs to be tied into and then code the car for the correct VO to include Servo-Tronic steering...

Just like when i asked about adding MDM to the 335/135. If the 1M has it. It can be added to a standard 335/135 because the 1M uses a MSD81 DME just like the 2008-2011 335s. 2007 and early 2008's with MSD80 DME can be converted if necessary just like if you went to BMW and ordered the BMW PPK for the N54...

M3 steering rack with OEM functionality plus Euro MDM would make the 335 a totally different car in my opinion. Add in an LSD and you have a great handling and controllable car!

[AWDBooSTIn90]

If someone could dig up a WDS for a 1M and a idk say 2010 335i N54 for ease of comparing. We can get this done!

The MDM would need at the very least a new steering wherl clock spring (standard part needed for an M3 adding MDM) and most likely an M3 abs module/pump... But thats a totally different topic that i wish someone would look into. People would pay for coding for adding these 2 features if a required parts list is made available or even sell it all as a package...

[TZANIDO777]

Just to confirm, those of us who do not have servotronic/active steering this is a straight swap, correct?

[whosdady]

Originally Posted by AWDBooSTIn90

If someone could dig up a WDS for a 1M and a idk say 2010 335i N54 for ease of comparing. We can get this done!

The MDM would need at the very least a new steering wherl clock spring (standard part needed for an M3 adding MDM) and most likely an M3 abs module/pump... But thats a totally different topic that i wish someone would look into. People would pay for coding for adding these 2 features if a required parts list is made available or even sell it all as a package...

And while we are dreaming, we should add the DCT option to replace the regular 6AT...

But if you're serious about how easy it would be to swap to an m3 rack, that would be huge for this platform imho... The racks can be found used and the coding likely isn't that difficult. It's everything in between that poses the problem.

[AWDBooSTIn90]

Originally Posted by whosdady

And while we are dreaming, we should add the DCT option to replace the regular 6AT...

But if you're serious about how easy it would be to swap to an m3 rack, that would be huge for this platform imho... The racks can be found used and the coding likely isn't that difficult. It's everything in between that poses the problem.

Theres already plenty of people with m3 steering racks in their 335i's. Just without servotronic active so it defaults to the stiffest setting, but it works fine.

And there has been a few 6AT to DCT swaps done already....

The M3, while it might seem so different is actually very similar to an E90 335i in many ways. Especially on the electric hardware side. The only big difference is that the M3 has its own DME, but the 1M does NOT. It uses an MSD81 DME found in any 2008+ N54 E90/ or 1-series.

So to think that servotronic and even MDM can't be added to the 335i is just crazy. Now if the 1M never came out then it might be way more difficult/impossible...

[AWDBooSTIn90]

Originally Posted by berns

The quicker rack definitely makes the car feel alive, you're now totally in tune with it, and it accentuates other things, like on my car, I've put a lot of time into suspension and chassis tuning, so yeah, I'm happy. I will say, though, I drive daily, and most of the time it's through annoying LA city streets at low speeds. The steering is definitely heavier than I'd like it at low speeds, especially in parking lots etc... Hopefully one day we can add a feature and wiring to JB4 to control the assistance.

The shop doing my install seems to have somehow broke my steering angle sensor while installing, so I've still got to get that sorted.

They probably turned the steering wheel when the steering shaft was disconnected from the rack. It needs to be locked, not just for centering the steering later, but to prevent exactly what happened to you...

[whosdady]

Originally Posted by AWDBooSTIn90

Theres already plenty of people with m3 steering racks in their 335i's. Just without servotronic active so it defaults to the stiffest setting, but it works fine.

And there has been a few 6AT to DCT swaps done already....

The M3, while it might seem so different is actually very similar to an E90 335i in many ways. Especially on the electric hardware side. The only big difference is that the M3 has its own DME, but the 1M does NOT. It uses an MSD81 DME found in any 2008+ N54 E90/ or 1-series.

So to think that servotronic and even MDM can't be added to the 335i is just crazy. Now if the 1M never came out then it might be way more difficult/impossible...

I've driven a 335i with an m3 rack. I actually had an m3 rack on order until I did that. It was way too heavy for a daily driven car imho...

On the other hand, I've never been in a 6AT converted to a DCT car. If money grew on trees that would be on my to do list... I'm guessing that would be quite expensive. Especially since I have a lot into my 6AT LSD.

[whosdady]

Any update here...?

Would it be possible to have our 335i rack rebuilt and have the ratio changed to equal the m3? Of course without needing to change anything else.

[prowheelie92]

has anyone tried to reach out to bms for the jb4 integration?

[SlimE92]

Any updates on this. I have an m3 rack on the way. I don't mind the harder steering but if there is a solution im willing to spend on it

[bbnks2]

Originally Posted by SlimE92

Any updates on this. I have an m3 rack on the way. I don't mind the harder steering but if there is a solution in willing to spend on it

http://www.1addicts.com/forums/showt...1137304&page=4

Looks like it has been fully retrofitted with some coding changes. The stock power steering pump is still going to be inferior to what the M gets, but you'll get 90% of the servo assist.

[SlimE92]

Originally Posted by bbnks2

http://www.1addicts.com/forums/showt...304&page=4

Looks like it has been fully retrofitted with some coding changes. The stock power steering pump is still going to be inferior to what the M gets, but you'll get 90% of the servo assist.

Good enough for me. Where would I find the coding details ?

[bbnks2]

Originally Posted by SlimE92

Good enough for me. Where would I find the coding details ?

It's all in that thread. You should be able to figure it out without a step by step DIY if you have some knowledge of how to add/remove values to your VO with winkfp and then "process whole car" in NCSexpert to apply the changes.