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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jul-12-2016, 11:12:45 AM   #11
rovert604
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Default '05 SMG M3 Wouldn't Shift Into 6th at low speed?

SMG allows you to upshift once you've hit 1500 when slowly accelerating on level ground or on a decline.

I always cruise at high gear when I don't need to do any moderate to hard acceleration. Fifth or sixth are happy increasing speed at 2000RPM when you're not asking too much.

I did that for the life of my ZHP's M54B30 engine until it was totalled at 175,000 miles. That engine was a freak even at that high mileage. It would launch from a stop aggressively and never did it miss any spark fire.

If the S54 feels/sounds like it's struggling then I'll downshift. Otherwise I'll cruise anywhere under 10% throttle position. My normal 40% city/40% suburbs/20% highway mileage is 22MPG. Sometimes I'll hit over 30MPG in the city if it's 2am and I get all greens. The most I've got is 34MPG on a straight 50-60MPH highway for two straight hours.
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Old Wed, Jul-13-2016, 04:33:26 PM   #12
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Default Re: '05 SMG M3 Wouldn't Shift Into 6th at low speed?

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Originally Posted by idriveastick View Post
Sorry, I meant no offense by "he." I simply meant it as "person," "they," "the owner," etc.
No offense taken! Just thought I'd point it out that it may be user error on my part, which it was.
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Old Wed, Jul-13-2016, 04:36:09 PM   #13
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Default Re: '05 SMG M3 Wouldn't Shift Into 6th at low speed?

Same here. I just feel it out. If it feels bogged down, i downshift.

I get excellent gas mileage in 6th when I'm just cruising on a trip down back roads. Average around 28-34 mpg when I've watched the gauge and confirmed it by doing the math. Pretty sweet that these cars are capable of that.


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Originally Posted by rovert604 View Post
SMG allows you to upshift once you've hit 1500 when slowly accelerating on level ground or on a decline.

I always cruise at high gear when I don't need to do any moderate to hard acceleration. Fifth or sixth are happy increasing speed at 2000RPM when you're not asking too much.

I did that for the life of my ZHP's M54B30 engine until it was totalled at 175,000 miles. That engine was a freak even at that high mileage. It would launch from a stop aggressively and never did it miss any spark fire.

If the S54 feels/sounds like it's struggling then I'll downshift. Otherwise I'll cruise anywhere under 10% throttle position. My normal 40% city/40% suburbs/20% highway mileage is 22MPG. Sometimes I'll hit over 30MPG in the city if it's 2am and I get all greens. The most I've got is 34MPG on a straight 50-60MPH highway for two straight hours.
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Old Wed, Jul-13-2016, 05:08:45 PM   #14
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Default Re: '05 SMG M3 Wouldn't Shift Into 6th at low speed?

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Originally Posted by nascar_acj View Post
when I've watched the gauge and confirmed it by doing the math
What gauge are you talking about?
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Old Wed, Jul-13-2016, 10:19:01 PM   #15
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Default Re: '05 SMG M3 Wouldn't Shift Into 6th at low speed?

My assumption would be gas gauge. Not sure if eyeball mileage is more or less accurate than butt dyno hp rating...
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Old Wed, Jul-13-2016, 10:58:54 PM   #16
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Default Re: '05 SMG M3 Wouldn't Shift Into 6th at low speed?

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My assumption would be gas gauge. Not sure if eyeball mileage is more or less accurate than butt dyno hp rating...
lol

I always assume my gas mileage, even if I calculate it from trip odo and gallons put in at fill up, is slightly optimistic. With the high-reading speedometers on these cars, how can we get a true gas mileage rating?
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Old Fri, Jul-15-2016, 08:32:00 PM   #17
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Default Re: '05 SMG M3 Wouldn't Shift Into 6th at low speed?

It's not only the engine rpm that matters for upshifting. The SMG also uses a g-sensor for many of it's functions. You should be able to upshift at1500rpm on a flat road but on a steep uphill it won't let you upshift bellow 3000rpm.
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Old Fri, Jul-15-2016, 08:40:20 PM   #18
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Default Re: '05 SMG M3 Wouldn't Shift Into 6th at low speed?

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It's not only the engine rpm that matters for upshifting. The SMG also uses a g-sensor for many of it's functions. You should be able to upshift at1500rpm on a flat road but on a steep uphill it won't let you upshift bellow 3000rpm.
Very interesting. Is this documented anywhere?
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Old Sat, Jul-16-2016, 07:27:15 AM   #19
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Default Re: '05 SMG M3 Wouldn't Shift Into 6th at low speed?

I've never read anything this far. I just know that stuff from experience. It's a smart system knowing and allowing when to upshift.
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Old Sat, Jul-16-2016, 05:15:48 PM   #20
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Default Re: '05 SMG M3 Wouldn't Shift Into 6th at low speed?

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Originally Posted by idriveastick View Post
Very interesting. Is this documented anywhere?
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Originally Posted by rovert604 View Post
I've never read anything this far. I just know that stuff from experience. It's a smart system knowing and allowing when to upshift.
Op, maybe you were on an incline, at that speed and gear it would deny shift. If no cog light came on I would not worry about it.
The smg will only deny a shift if it will stall or cause excessive load on the drivetrain. In other words, if you command a shift like you would driving a manual, you will have no problems ☺
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Discussing '05 SMG M3 Wouldn't Shift Into 6th at low speed? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)