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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Can you explain "turbo lag" to a novice?



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      08-07-2008, 12:14 PM   #67
slubu
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Quote:
Originally Posted by Pangearox View Post
sorry for this but...


what is WOT?
It is Wide Open Throttle. I think it means when you mash the pedal to the floor. Which leads into my question above.
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      08-07-2008, 12:46 PM   #68
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Tested today with my pre v29.2 Noelle tuning and a boost gauge. It takes about 0.5 seconds at 2000 rpm & WOT until noticeable boost is built up.

- Eugen
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      08-07-2008, 12:54 PM   #69
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Quote:
Originally Posted by e.n335 View Post
Tested today with my pre v29.2 Noelle tuning and a boost gauge. It takes about 0.5 seconds at 2000 rpm & WOT until noticeable boost is built up.

- Eugen
in which gear? mine is worse the higher the gear.
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      08-07-2008, 01:17 PM   #70
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Quote:
Originally Posted by e.n335 View Post
Tested today with my pre v29.2 Noelle tuning and a boost gauge. It takes about 0.5 seconds at 2000 rpm & WOT until noticeable boost is built up.

- Eugen
That is one of the problem, you state noticeable boost while others are wanting maximum boost. The measuring standards are different yet people are wanting to compare notes.
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      08-07-2008, 01:18 PM   #71
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Quote:
Originally Posted by mistermojorizin View Post
in which gear? mine is worse the higher the gear.
That is due to the car reving quicker in lower gears. It will get up higher in the band quicker which allow more exhaust energy to help.
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      08-07-2008, 01:38 PM   #72
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Quote:
Originally Posted by slubu View Post
Let me phrase it this way:

From 0-50% throttle depression, I have pretty much instantaneous response. However, if I floor it, meaning I push the pedal all the way down until it contacts the floor, the car does not really move for a while, like 2-4 seconds.

Is this normal or a side effect of the new DME/progman?
Slubu....welcome to the v29.2 gang...sounds to me like your infected with v29.2 lag....
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      08-07-2008, 02:27 PM   #73
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Quote:
Originally Posted by scalbert View Post
That is one of the problem, you state noticeable boost while others are wanting maximum boost. The measuring standards are different yet people are wanting to compare notes.
You are 100 % right. Full boost ( 13 - 14.8 psi sustainable ) comes at 3000 rpm and so the torque ( and @ later time, of course ).

BTW, who goes WOT at 2000 rpm ? Shift down. The first gear is NP.
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      08-07-2008, 02:29 PM   #74
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Quote:
Originally Posted by mistermojorizin View Post
in which gear? mine is worse the higher the gear.
3rd gear, steptronic DS mode.
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      08-07-2008, 04:28 PM   #75
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Quote:
Originally Posted by e.n335 View Post
3rd gear, steptronic DS mode.
so you don't go WOT? because the step can't hold a gear, right?
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      08-07-2008, 04:51 PM   #76
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Quote:
Originally Posted by mistermojorizin View Post
so you don't go WOT? because the step can't hold a gear, right?
I holded the gear ...
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      08-07-2008, 04:58 PM   #77
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Quote:
Originally Posted by e.n335 View Post
I holded the gear ...
Held.
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      08-07-2008, 05:08 PM   #78
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Quote:
Originally Posted by dmboone25 View Post
Held.
Thanks, so I held the gear
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      08-07-2008, 05:09 PM   #79
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Quote:
Originally Posted by e.n335 View Post
Thanks, so I held the gear
lol...just giving you shit.
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      08-07-2008, 11:48 PM   #80
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stupid question, but..

how can I tell which software my car is running?

thanks
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      08-08-2008, 01:37 AM   #81
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Quote:
Originally Posted by ik999 View Post
stupid question, but..

how can I tell which software my car is running?

thanks
you can't
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      08-08-2008, 03:33 AM   #82
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Quote:
Originally Posted by scalbert View Post
That is one of the problem, you state noticeable boost while others are wanting maximum boost. The measuring standards are different yet people are wanting to compare notes.
It's definitely one of the problems, which is why I'm trying to find another stock vehicle owner in my area to compare the car to. Tunes are another complicating factor.

However, I'd say that if I got any noticeable boost in 0.5s at 2k rpm, I would not be complaining as much about this issue. I know the car can't go from zero to full turbo in an instant, but I don't feel any appreciable increase in acceleration for about 1.6s. In fact, the acceleration I get before the boost feels no greater than that of just about every other car I've driven (approximately 2 dozen different models) since first experiencing this issue almost 3 months ago.
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