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      03-10-2017, 11:28 PM   #177
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[quote=dkhm3;21397644]
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Originally Posted by Nicky_do_it View Post

I am not sure I understand, is this lag coming from flooring it from a constant speed? also, is the dct in D1?

The proper way to drive any car is the downshift the gear to where the rpms are at the sweet spot- around 4k in this car and THEN floor it. There should be little lag.
I've been more or less saying the same thing. I haven't experienced any perceptible boost lag at all (...and this isn't my first turbocharged car; in other cars it was noticeable). Being in the right gear for the circumstances makes all the difference.
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      03-11-2017, 08:06 AM   #178
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Quote:
Originally Posted by dkhm3 View Post
I am not sure I understand, is this lag coming from flooring it from a constant speed? also, is the dct in D1?

The proper way to drive any car is the downshift the gear to where the rpms are at the sweet spot- around 4k in this car and THEN floor it. There should be little lag.

The only real lag I have experienced driving this car is when you bounce between gears. say you are on the highway at 50 mph in 6th gear, then you drop 3 gears to 3rd anticipating a pass. The is no room so you upshift 2 gears to 5th. If i then drop it back down to 3rd, the car is momentarily laggy, even in 3rd. and wot takes an extra second to kick in.
Drive at a constant speed in Sport+ with the engine at 6000RPM, then floor the throttle, you will feel a delay before the full power kicks in. That is turbo lag. It is there, there is no denying it.
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      03-11-2017, 09:45 AM   #179
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[quote=Sedan_Clan;21398457]
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Originally Posted by dkhm3 View Post

I've been more or less saying the same thing. I haven't experienced any perceptible boost lag at all (...and this isn't my first turbocharged car; in other cars it was noticeable). Being in the right gear for the circumstances makes all the difference.
The lag we mean is, when you floor it, the power doesn't come on instantly. I've driven both Turbo and naturally aspirated engine cars, the feeling is different. Take any NA car and the moment you floor it, you get pulled back in your seat but with the M4, despite it having a lot of power, it's not instant.

this isn't any biased opinion since we all own this car. Just how Turbos work
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      03-11-2017, 10:14 AM   #180
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[quote=Snappy Phoenix;21399509]
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Originally Posted by Sedan_Clan View Post
Quote:
Originally Posted by dkhm3 View Post

I've been more or less saying the same thing. I haven't experienced any perceptible boost lag at all (...and this isn't my first turbocharged car; in other cars it was noticeable). Being in the right gear for the circumstances makes all the difference.
The lag we mean is, when you floor it, the power doesn't come on instantly. I've driven both Turbo and naturally aspirated engine cars, the feeling is different. Take any NA car and the moment you floor it, you get pulled back in your seat but with the M4, despite it having a lot of power, it's not instant.

this isn't any biased opinion since we all own this car. Just how Turbos work
That's not exactly true. Floor an automatic NA car, and it first has to drop to an optimal gear (...even though that happens fairly quickly), and then you get the rush. I've never floored my M4 at speed and not had it respond the way I wanted.
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      03-11-2017, 11:10 AM   #181
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Quote:
Originally Posted by Sedan_Clan View Post
That's not exactly true. Floor an automatic NA car, and it first has to drop to an optimal gear (...even though that happens fairly quickly), and then you get the rush. I've never floored my M4 at speed and not had it respond the way I wanted.
This is irrelevant. Lag is about reaction to throttle input and is not related to the delay of downshifting an automatic transmission.
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      03-11-2017, 11:21 AM   #182
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Turbo lag does exist. It may be very minimal compared to some turbo cars but believe me, when I floor the x5(v8tt) or M3 the vehicle starts moving and then the freight train takes over.
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      03-11-2017, 11:22 AM   #183
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[quote=CanAutM3;21399789]
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Originally Posted by Sedan_Clan View Post
Quote:
Originally Posted by Snappy Phoenix View Post
That's not exactly true. Floor an automatic NA car, and it first has to drop to an optimal gear (...even though that happens fairly quickly), and then you get the rush. I've never floored my M4 at speed and not had it respond the way I wanted.
This is irrelevant. Lag is about reaction to throttle input and is not related to the delay of downshifting an automatic transmission.
My point was that I think sometimes people confuse transmission lag with boost lag.
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      03-11-2017, 02:54 PM   #184
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Quote:
Originally Posted by CanAutM3 View Post
Drive at a constant speed in Sport+ with the engine at 6000RPM, then floor the throttle, you will feel a delay before the full power kicks in. That is turbo lag. It is there, there is no denying it.
While it is there, it is very brief.

I wonder if the lag is more perceptible because the s55 is so explosive at wot.

the s63 on the x5m @ highway speed, downshifting 3 gears and wot does not have the same punch in your gut bang. even considering awd.
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      03-11-2017, 02:57 PM   #185
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[quote=Sedan_Clan;21399826]
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Originally Posted by CanAutM3 View Post
My point was that I think sometimes people confuse transmission lag with boost lag.
I completely agree, bmw should have included some tutorials on how to drive the DCT. It is more complicated to drive than a conventional auto, and people have no patience to figure things out on their own.
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