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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 09-19-2013, 08:48 AM   #1
mpwr92
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e46 m3 smg downshift

Hey guys just got a 2004 e46 m3 smg just trying to get my head around this smg gearbox I was going down a little hill the other day and I down shifted from 4 to 2 gear it sounded like it hit rev limiter but felt like the clutch was disengaged is this normal for smg im thinking its a safety thing as the revs went back down and the clutch engaged again is this how they work I was driving it in S2 mode if that helps?
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Old 09-19-2013, 08:58 AM   #2
dlara01
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Re: e46 m3 smg downshift

Yes it will not let you over rev the engine. My question is why did you downshift? This isn't an 18 wheeler pulling a trailer. Should only down shift to go faster for the most part. I take my smg to the track, the great thing is that you can't miss a gear downshifting and blow an engine.

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Old 09-19-2013, 09:16 AM   #3
mpwr92
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Yeh I understand it isn't a 18 wheeler just didn't wanna brake as much but to be honest i don't even think it hit 8000 rpm rev limiter it sounded more like 5,500 but I could be wrong is that how they are? As the speed reduced she was back on
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Old 09-19-2013, 09:23 AM   #4
DSilk56
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You shouldn't be downshifting to slow down your car under any circumstances. It's one thing to coast down in gear, which is okay. It's quite another to drop to a lower gear to save wear on your brake pads and rotors. Pads and rotors are easy to replace, and are relatively inexpensive. Moreover, they are designed to stop your car. You cannot say the same for engines, clutches, or transmissions.
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Old 09-19-2013, 10:27 AM   #5
choxor
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While it's not a manual, it's still a 100% manual transmission and you have to treat it as such. Same thing would have happened if you put the car in second and let the clutch out.

Brakes are for slowing and stopping the car. That's their job. While there's nothing wrong with using the transmission to slow down (I do it a lot when I drive a conventional manual), it's obvious that you went into second while going way too fast.
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Old 09-19-2013, 01:32 PM   #6
///M3murray
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Try throttle blipping immediately after you pull the paddle, this allows for a smoother downshift
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Old 09-19-2013, 03:06 PM   #7
rcsummers
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The SMG likes to down shift on its own, just brake and let it happen.


If your having fun though, by all means, down shift, but there is a 3rd gear you could go into first to keep this from happening.
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