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      12-01-2014, 12:11 PM   #1
Accel Junky
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Turbo Lag and Reviewers...

I LOVE my F80 M3. It combines some great things about most of the 35+ vehicles I have owned. But, I just have to get this off my chest.

I read just about every review from the press and from individuals and watched every video I could. The majority of these outright proclaimed turbo lag was either eliminated or virtually eliminated or greatly reduced or barely present.

I've owned a lot of turbo cars. Some factory, some aftermarket, some small turbos, some big turbos, some singles, some twins, some sequential, some non-sequential.

I can absolutely detect the turbo lag in this car. It is plain as day to me. I do not think there is anything remarkable about the lag reduction. That's OK. I bought a turbo car...I knew that going in. But let's not kid ourselves...
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      12-01-2014, 12:17 PM   #2
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Never understood why this was even considered an issue in the n54/n55 and is now being talked about in the s55. It is hardly an inconvenience in any way as the spool is near instantaneous... you do get mounds of tq.
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      12-01-2014, 12:24 PM   #3
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Quote:
Originally Posted by Accel Junky View Post
I can absolutely detect the turbo lag in this car. It is plain as day to me. I do not think there is anything remarkable about the lag reduction. That's OK. I bought a turbo car...I knew that going in. But let's not kid ourselves...
No doubt there is lag even in sport mode but what do expect? it's only 3.0 liter which is why the torque down low depends on boost coming in. The N54 had way more lag especially after the introduction of the protective engine software changes--at least in the 2008 335 I had.
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      12-01-2014, 12:27 PM   #4
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Although there is a smidgen of lag before turbos spool, the subsequent rise in power is relatively linear and predictable for N54/55 and S55. The 'old' turbos were wait, wait, wait, 'bang' peaky power curves.
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      12-01-2014, 12:28 PM   #5
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I am gonna guess people here havent driven an evo.
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      12-01-2014, 12:53 PM   #6
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Yes lag is there, particularly in comfort mode and less so in sport or sport plus..But definitely there
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      12-01-2014, 12:57 PM   #7
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Quote:
Originally Posted by ASAP
I am gonna guess people here havent driven an evo.
Or a modern turbo diesel. Step on the gas in my Cayenne at 1,200 RPM In 6th gear and you'll see what lag really is. Even with VGT's.
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      12-01-2014, 01:00 PM   #8
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Sub 2k lag no doubt

In the power band, I don't notice it

Much better throttle response and smoothness than the n54 in my 1m
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      12-01-2014, 01:02 PM   #9
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I have read references to 400 ft-lbs of torque available at 2K rpm - my car is not past break in yet but I feel the surge coming on much later around 4k rpm
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      12-01-2014, 01:09 PM   #10
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Quote:
Originally Posted by RickMonet View Post
I have read references to 400 ft-lbs of torque available at 2K rpm - my car is not past break in yet but I feel the surge coming on much later around 4k rpm
Same thing happens with NA engines too; the GT3 had decent amount of hp below 4600, but passed that point you could feel the cam timing changing and the surge of power. That's not turbo lag.
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      12-01-2014, 01:56 PM   #11
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Quote:
Originally Posted by RickMonet View Post
I have read references to 400 ft-lbs of torque available at 2K rpm - my car is not past break in yet but I feel the surge coming on much later around 4k rpm
You know...I have read the same thing but I don't particularly feel like I'm getting that much torque down low. I'm no expert how the rpm/torque translates to felt thrust though.

In any case, LOVE my F80 M3 and I accepted the lag before i bought it but it is definitely there and I can't tell much of a difference from my 08 335i.
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      12-01-2014, 01:57 PM   #12
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Don't confuse turbo lag with the engine trying to build up RPM momentum under load. Keep in mind that an engine has to slow down in order to speed back up again. Just like rebuilding momentum when you are pedaling your bicycle down the road or up a hill.
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      12-01-2014, 02:00 PM   #13
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Quote:
Originally Posted by nickdrivesm3 View Post
Don't confuse turbo lag with the engine trying to build up RPM momentum under load. Keep in mind that an engine has to slow down in order to speed back up again. Just like rebuilding momentum when you are pedaling your bicycle down the road or up a hill.
When I refer to turbo lag, I'm referring to the time it takes for the turbos to spool to the desired boost once the throttle is opened.
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      12-01-2014, 02:10 PM   #14
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I've owned a 2012 WRX and a 2007 STI, and those had turbo lag. This car is on a different playing field. I'm sorry, but I don't think your opinion is valid on this matter, especially considering the opinions you're disputing.
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      12-01-2014, 02:16 PM   #15
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      12-01-2014, 02:22 PM   #16
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Quote:
Originally Posted by Accel Junky View Post
When I refer to turbo lag, I'm referring to the time it takes for the turbos to spool to the desired boost once the throttle is opened.
Downshift, Smart one
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      12-01-2014, 02:29 PM   #17
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Quote:
Originally Posted by Accel Junky View Post
When I refer to turbo lag, I'm referring to the time it takes for the turbos to spool to the desired boost once the throttle is opened.
Approx how long does that take?

Curious.
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      12-01-2014, 02:31 PM   #18
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Quote:
Originally Posted by dclowd9901 View Post
I've owned a 2012 WRX and a 2007 STI, and those had turbo lag. This car is on a different playing field. I'm sorry, but I don't think your opinion is valid on this matter, especially considering the opinions you're disputing.
I owned a 2005 WRX and what that car had is what I consider the turbo lag. On F80 (or even the F30 I have), there's almost no turbo lag. You give it a little bit of throttle (even at 2,000 RPM), and the turbo spools up quickly. On the WRX there's no turbo spool, even if you floor the pedal, until past 3,000 RPM.

If you want your turbo to always be spooling, then keep the RPM > 2,000 at all times. You'd just be eating up lots of gas in an unnecessary way. BMW knows how to make the car gas efficient while providing ample amount of power.
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      12-01-2014, 02:37 PM   #19
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It's a free country. Everyone is entitled to their opinion and I shared mine. I have not timed the spooling and I don't intend to. I know how to downshift. And I've owned far more forced induction cars than 99.9% of the population has owned any car. I'm not complaining, I'm just airing my opinion that the reviews have distorted reality perhaps for some.

Eating my popcorn as well..
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      12-01-2014, 02:40 PM   #20
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Quote:
Originally Posted by Accel Junky View Post
It's a free country. Everyone is entitled to their opinion and I shared mine. I have not timed the spooling and I don't intend to. I know how to downshift. And I've owned far more forced induction cars than 99.9% of the population has owned any car. I'm not complaining, I'm just airing my opinion that the reviews have distorted reality perhaps for some.

Eating my popcorn as well..
Not to thread jack.. But who has more miles on there M, you or your spouse? An who's gotten a ticket.

O, an nice shirt
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      12-01-2014, 02:40 PM   #21
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Quote:
Originally Posted by Accel Junky View Post
It's a free country. Everyone is entitled to their opinion and I shared mine. I have not timed the spooling and I don't intend to. I know how to downshift. And I've owned far more forced induction cars than 99.9% of the population has owned any car. I'm not complaining, I'm just airing my opinion that the reviews have distorted reality perhaps for some.

Eating my popcorn as well..
Maybe its because downshifting takes too long with that 1920s transmission... :P lol sorry couldn't resist buddy.
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      12-01-2014, 02:43 PM   #22
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I'm pleasantly surprised with how responsive the turbos are. Better than any other turbo car I've driven. Is there lag? Of course there is but it's so minimal that it's not an issue. You don't need to plan power application like in some other cars where you push the throttle deep before you want power, back off some to avoid a turbo kick and then wait for the power. I find the S55 to be fairly true to throttle inputs and that is a good thing since you need that fine grained modulation when pushing a car with this much TQ. Fantastic FI engine, I side with the reviewers on this one
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