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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 07-11-2013, 04:01 PM   #1
Dirty-330
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Join Date: Jul 2011
Location: Ontario
Posts: 150
My Ride: 01 330ci 5spd
Clutch master confusing the DME

Ok Im going to try this again.

Ive had this problem ever since I bought the car 2 years ago. I bought the car needing a clutch, I never drove it or an e46 prior.

This is how I described the problem 2 years ago when I got the car;

"I feel 1st gear is very laggy plus lacks power and responsiveness. BUT when I launch the car and around 2000rmp I press ever so lightly on the clutch, THE CAR TAKES OFF WITH LOTS OF POWER.

I am pushing extremely lightly on the clutch pedal, not even close to disengage point."

I decided I would live with the problem until I check the essentials of the list first.

Let me explain the feeling again.

After launching the car, and the clutch becomes fully engaged I feel a HUGE lack of power(feels just like limp mode), when I press the clutch very lightly the power is back and in full effect. I can activate the power thru a range of rmps, not just 2000rmp like I had said 2 years ago.

Ive concluded that the lack of power is the dme thinking the clutch has been pressed in for a gear change (dme changes timing and other things between gear changes and clutch in idles), touching the clutch seems to inform the system im actually driving and it delivers power.
Prior to me touching clutch to get full power I can not set the cruise control.

When I remove the clutch switch(single magnetic switch on master) I cannot get any power from touching the clutch lightly, I also feel it remains in that laggy mode the whole time. (Cruise also doesnt work with switch removed)

I recently bought a new clutch switch hoping it would fix the problem but its the same with new switch installed. errr!

A couple things I would like to know, could the mechanism in the master that speaks to the clutch switch that in turn speaks to the dme be faulty, loose, or changed its position. Also, is there a way to trick the switch into thinking the clutch is permanently engaged (i know my revs would take a long time to drop in between changing gears) for test purposes.

Is it possible to retrofit the system thats found on the early e46s(two mechanical clutch switches, one for start and other for cruise/gear changes) then I could do the felt pad mod and hopefully be out of the woods.

Should I throw more money at guesses and buy a new master cylinder?

Anyone with a used functioning master for sale.

I would really love to fix this problem, its pretty annoying.
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Old 07-11-2013, 04:19 PM   #2
Dirty-330
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Join Date: Jul 2011
Location: Ontario
Posts: 150
My Ride: 01 330ci 5spd
Also is it possible to disassemble the master cylinder and see if anything looks broken,worn or out of place?
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Old 07-12-2013, 10:33 PM   #3
lszlszx
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Join Date: Jan 2013
Location: Venice, CA
Posts: 3,799
My Ride: 328i, XC70
So the DME is doing with the clutch engaged what it's supposed to do when the clutch is disengaged? Could the wires be reversed, did the PO messed with it?
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Old 07-13-2013, 03:51 AM   #4
daniel_f.
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Join Date: Jul 2011
Location: Germany
Posts: 438
My Ride: 330iCA
is there really a sensor which measures clutch (dis-)engagement and limits power?
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kind regards
Daniel

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Old 07-18-2013, 10:08 AM   #5
Dirty-330
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Join Date: Jul 2011
Location: Ontario
Posts: 150
My Ride: 01 330ci 5spd
Well I know that the PO did not mess with it. He is not mechanically inclined at all, I remember he called me once to change his flat tire on side of road one day early in the cars life. I would bet he had never been on this site, I asked him if he knew what a clutch delay valve was and he looked at me like a deer in headlights.

Unfortunately he didnt do a single thing to the car after warranty was up, I bought one of the most neglected 330s in north america I would bet. It sat out in the elements for a couple years w/o ever being washed or started or anything, It had accumulated enough rust that Im slowly taking care of. On top of that they never changed any parts, Ive got records of dealer recommending to change the control arm and the bushings 4 yrs before I bought the car. They only put gas and oil in the car, NOTHING else.

Since I bought it shes been given plenty of attention, Im slowly bringing it up to par, and I LOVE this car. Its like its a child I adopted from abusive parents.



Daniel, yes the DME does adjust its power/torque in conjunction with clutch pedal position, it was discussed in the "felt pad mod" thread.

Thinking of ordering a master cylinder, since that holds the mechanism that sends signal to the clutch switch, like I said with switch removed I can not trigger the power surge.
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