Rev Match?

E91 Hoarder · 02-22-2013, 04:40 PM

When cruise control is activated, the car does rev match when downshifting. Do you think it is possible to activate the rev match through coding for normal driving (MT)?

Surly73 · 02-22-2013, 05:31 PM

Quote:

Originally Posted by iSerge

When cruise control is activated, the car does rev match when downshifting. Do you think it is possible to activate the rev match through coding for normal driving (MT)?

Huh?

When you go to shift an MT car on cruise, how would it know whether you were shifting up or down?

When you press the clutch, the cruise control temporarily suspends. It resumes shortly after releasing the clutch (probably long enough for the software to check that you aren't in neutral - haven't played with that).

I just don't see coding getting you psychic rev matched downshifts on an MT when using cruise control.

E91 Hoarder · 02-22-2013, 05:39 PM

Quote:

Originally Posted by Surly73

Huh?

When you go to shift an MT car on cruise, how would it know whether you were shifting up or down?

When you press the clutch, the cruise control temporarily suspends. It resumes shortly after releasing the clutch (probably long enough for the software to check that you aren't in neutral - haven't played with that).

I just don't see coding getting you psychic rev matched downshifts on an MT when using cruise control.

Have no idea, how it knows about downshifting, but last night I was cruising and had to downshift. When I depressed the clutch and moved to a lower gear the revs automatically went up and matched it. So, I assume the computer somehow detects it and assists with rev matching during the cruise control. So, why not during the normal driving?

ctuna · 02-22-2013, 07:50 PM

I think its trying to maintain the speed.
Anything else is a consequence of the that.

crypticc · 02-23-2013, 01:01 AM

Quote:

Originally Posted by iSerge

Have no idea, how it knows about downshifting, but last night I was cruising and had to downshift. When I depressed the clutch and moved to a lower gear the revs automatically went up and matched it. So, I assume the computer somehow detects it and assists with rev matching during the cruise control. So, why not during the normal driving?

Does upshifts too. It is in official literature but am surprised they only implemented when cruse control on.

w2830 · 02-24-2013, 03:15 AM

you shouldve got an auto in the first place.lol

Surly73 · 02-25-2013, 07:34 AM

Well, I played around with this on the weekend.

I had never even noticed this, since you have to sit there with the clutch pushed and observe which is not something I do in normal driving. On my 2007 328i 6MT the ECU would hold the revs from dropping below the proper RPM for the next higher gear. If you were already in 6th it would simply hold revs correct for the corresponding road speed.

There was certainly no downshift rev matching.

02-22-2013, 04:40 PM	#1
E91 Hoarder Captain 123 Rep 852 Posts Drives: E91 AWD, E91 RWD, E90, X535i Join Date: Oct 2011 Location: On the Road iTrader: (8)	Rev Match? When cruise control is activated, the car does rev match when downshifting. Do you think it is possible to activate the rev match through coding for normal driving (MT)? __________________ "Let me see what I can do... sir" Last edited by E91 Hoarder; 02-22-2013 at 04:49 PM..
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02-22-2013, 07:50 PM	#4
ctuna Lieutenant General 1911 Rep 13,103 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	I think its trying to maintain the speed I think its trying to maintain the speed. Anything else is a consequence of the that.
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02-24-2013, 03:15 AM	#6
w2830 Private First Class 21 Rep 128 Posts Drives: 2008 E92 335I Join Date: Dec 2012 Location: Canada iTrader: (0)	you shouldve got an auto in the first place.lol
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02-25-2013, 07:34 AM	#7
Surly73 Lieutenant Colonel 534 Rep 1,873 Posts Drives: '11 535xi 8AT KWv3 MPE MHD xHP Join Date: May 2012 Location: Oakville, Ontario iTrader: (1)	Well, I played around with this on the weekend. I had never even noticed this, since you have to sit there with the clutch pushed and observe which is not something I do in normal driving. On my 2007 328i 6MT the ECU would hold the revs from dropping below the proper RPM for the next higher gear. If you were already in 6th it would simply hold revs correct for the corresponding road speed. There was certainly no downshift rev matching.
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