lag in 'Normal' mode?

[tranquility]

Is there such a thing, like turbo lag for the 35i? I find whenever I leave it in 'Normal' mode, it takes ~0.5 seconds (or something like that, a gap) from pressing the gas to the car actually moving. This lag is not present or as apparent when I switch to 'Sport' mode though.

[MDLFCS]

Yes, so I either press the pedal slowly or use either of the Sport modes.

[Dr Stig 2]

same here with the 35is

if only the car would remember to stay in sport mode!

Prochip - are you listening?!?

[flpnout]

You guys have DCT right? I encountered this when I was test driving DCT before I ordered the manual transmission. I thought it was odd there was lag, then when I test drove a 335 manual I didn't feel any lag at all.

[Projekt35i]

I am guessing that with DCT being an electronic controlled dual clutch transmission, this short lag is probably the time it takes for the clutch to be engaged before the vehicle starts moving. Just my 2 cents

[juhap]

This has happened maybe 5 times in my MT Zed as well. I press the loud pedal and nothing happens for a second making me double-check I've really put the car in 1st gear. It's so rare that it doesn't really bother me. I'm guessing the computer is too busy surfing car porn and thus overloading the CPU for a moment.

[Serge_Ch]

Looks like it is a common issue for all Z4s, from 23 to 35 and from MT to AT, and most probable it is related to the factory setup of CPU. I have heard (but have not yet tried it) that some tuning can remove this lag (e.g. http://burgertuning.com/BMS_Power_Box.html).

[Roadstergal]

I have a manual transmission and honestly have never experienced any turbo lag what so ever.

[Silver-Bolt]

Drive by wire delay. There is a slight delay from when the throttle pedal is depressed to when the servo opens the throttle body. Normal in drive by wire vehicles. Sport mode reduces the delay time.

[BlueZ4AZ]

Does anyone really use Normal mode, other than when the engine is first warming up for the first couple miles?

I didn't buy the car to save gas. Basically, that is what Normal mode is designed for. If I wanted to save gas I would have purchased a Prius.

After the engine warms up, I am either in Sport shift mode or Manuall shift mode ALL the time, and in Sport setting 80% of the time and Sport + setting the other 20%. No turbo lag.

[tranquility]

Originally Posted by Serge_Ch

Looks like it is a common issue for all Z4s, from 23 to 35 and from MT to AT, and most probable it is related to the factory setup of CPU. I have heard (but have not yet tried it) that some tuning can remove this lag (e.g. http://burgertuning.com/BMS_Power_Box.html).

Hmmm, wonder if that device works, although I don't see it being specifically applicable to the 35i? I guess it'll void the warranty?

Originally Posted by BlueZ4AZ

Does anyone really use Normal mode, other than when the engine is first warming up for the first couple miles?

I didn't buy the car to save gas. Basically, that is what Normal mode is designed for. If I wanted to save gas I would have purchased a Prius.

After the engine warms up, I am either in Sport shift mode or Manuall shift mode ALL the time, and in Sport setting 80% of the time and Sport + setting the other 20%. No turbo lag.

Haha, I hear ya. I'm still in break-in mode though, and probably will spend most of my time in 'Sport' later on as well.

[flpnout]

Originally Posted by Roadstergal

I have a manual transmission and honestly have never experienced any turbo lag what so ever.

+1 Definitely no "lag" here......just "hums".

[teagueAMX]

Originally Posted by Serge_Ch

Looks like it is a common issue for all Z4s, from 23 to 35 and from MT to AT, and most probable it is related to the factory setup of CPU. I have heard (but have not yet tried it) that some tuning can remove this lag (e.g. http://burgertuning.com/BMS_Power_Box.html).

Are you suggesting that normally aspirated (NA) models (23i and 30i) have turbo lag? That defies the definition of a NA engine, which are characterized by instantaneous throttle response.

If on occasion a car fitted with a DCT may have twinkling of a delay at a stop light, maybe, but that's not "lag". And this would have nothing to do with the ECU. Certainly no NA car fitted with a MT would have it - how would you even notice it on a MT car anyways? Throttle response is instantaneous and it takes time to manually engage the clutch, shift, etc.

[bill123]

I find the most 'lag' is shifting from reverse to drive, the DCT seem's to want to think about it for about 2-3 seconds.

This has nothing to do with the Turbo's I'm sure

[teagueAMX]

Originally Posted by bill123

I find the most 'lag' is shifting from reverse to drive, the DCT seem's to want to think about it for about 2-3 seconds.

This has nothing to do with the Turbo's I'm sure

Agreed. And this is the misperception we have in an electronic age.

How long does it take a fully automatic transmission to shift from N to R, or D to R, etc.? It's not instantaneous.

When you drive a MT, it takes some amount of time but your mind and body are fully engaged in the operation so you don't notice a delay or "lag", whatever term you want to use.

[Memphis1]

Freaking rookies... Reset your ECU...

[Serge_Ch]

Originally Posted by teagueAMX

Are you suggesting that normally aspirated (NA) models (23i and 30i) have turbo lag? That defies the definition of a NA engine, which are characterized by instantaneous throttle response.

If on occasion a car fitted with a DCT may have twinkling of a delay at a stop light, maybe, but that's not "lag". And this would have nothing to do with the ECU. Certainly no NA car fitted with a MT would have it - how would you even notice it on a MT car anyways? Throttle response is instantaneous and it takes time to manually engage the clutch, shift, etc.

Agree to some degree. I have forgotten to mention that I meant a general lag (not a turbo lag), i.e. delay in response when you are pressing gas pedal after full stop. It is quite noticeable after driving experience with Jaguar S-type or Audi TT. And I have experienced this lag (delay, pause, etc) in Normal mode both on my 23i and on 30i/35i I got for test drives.

[juhap]

Originally Posted by Serge_Ch

I have forgotten to mention that I meant a general lag (not a turbo lag), i.e. delay in response when you are pressing gas pedal after full stop.

Same here. The issue I described has nothing to do with turbo lag.

[Dr Stig 2]

Normal mode: only if I am about to drive over a corrugated road to soften up the suspension (adaptive susp fitted on mine). It does however introduce a "lag" in the throttle response and the gears in the DCT are sluggish and jump to D7 to save fuel far too regularly (At 50kph in 7th - jeez). It is highly annoying - I have only lasted about 10km so far in normal before revolting and hitting the sport button.

Sports mode solves the problem. Need to have the car remember that I like it so I dont get a chance to forget.
Its like starting a space shuttle.
One button for handbrake. another for start, another for sport, another for the safety warning (ours doesn't seem to turn off in time) then another to get the map (just for the pretty view for the passenger ). ALmost need a pre-flight check list...
All good fun though...

[richard in NC]

You all hit on my points here but to re-emphasize: The DCT can and does have some "lag" shifting from drive to reverse or vice versa. I have also noticed an occasional "lag" trying to do a quick stop. It seems it takes 1 second for the computer to activate the clutch on a stop and then release it. If you pull out before that time, there is a pause. That is NOT turbo lag.

From a normal stop at a light (ie 30 seconds), I've never experienced a lag starting off, even in normal mode. I would not describe any electronic throttle delay either in normal mode.

To me, Sport mode merely ramps up throttle percentage faster (ie 30% throttle in Sport is like 50% normal, and 60% in sport is like 100% in normal).

You have not experienced turbo lag unless you've driven an older turbo model. Real old fashioned turbo lag was mashing the throttle at 2000 RPMs, and feeling like you only have 2 cylinders working until 2500 RPMs, and boom, the after burners hit and the car accelerates hard. Or even at 4k RPMs, you could count to 2 before a press of the throttle resulted in real acceleration. The Z4 35i has virtually non existent turbo lag but any delay in acceleration is perceived as such simply because it is a turb\o.

[Ermis]

This used to happen to me when i was driving my car in normal mode during the break in period.Not anymore tho cause i'm always in sport+ mode.