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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 > ... is this turbo lag ?



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      10-08-2008, 06:09 PM   #1
Potty_Pants
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... is this turbo lag ?

Hi guys,

while romping on my car in mexico

(this happened twice so far)

1st gear full throttle (full thrust as expected)
clutch shift to 2nd quickly
2nd gear full throttle (full thrust as expected)
clutch shift to 3rd apparently slowly
3rd gear full throttle it appeared to bog down for a second or two before
the power was built up.

When i first experienced this I thought it was a software bug or a confused component the next time i experienced it I get the feeling that I let off the throttle for 200% more time then i normally do and this is what happens.

am i right ?

thanks

ppp
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      10-08-2008, 06:26 PM   #2
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try it again with the traction controls all the way off. you might have been shifting hard enough that you would have chirped the tires on a car with no traction control, but instead the TC cuts power. i noticed that sometimes the car will cut power a little bit without the light going on in the dashboard

You pretty much don't get turbo lag in a stock production car. most of the time when people talk about 'turbo lag' it it really that the car is below the 'boost threshold'. 'turbo lag' is when you hit the gas and the turbo takes time to spin up and pressurize the manifold. A great example of this is a modified 2.0L WRX with a huge turbo. hit the gas.. nothing nothing warp speed
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      10-08-2008, 06:29 PM   #3
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I did have DSC off. I'll try the other next time

thanks for the tip

ppp
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      10-08-2008, 06:33 PM   #4
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Quote:
Originally Posted by Potty_Pants View Post
I did have DSC off. I'll try the other next time

thanks for the tip

ppp
DTC mode just turns off the yaw sensors.. it will still brake the wheel/cut power to prevent wheelspin..
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      10-08-2008, 06:50 PM   #5
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Quote:
Originally Posted by Nick Nazareno View Post
DTC mode just turns off the yaw sensors.. it will still brake the wheel/cut power to prevent wheelspin..
ya if you dont know...hold the dtc button down to acquire dsc haha
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      10-08-2008, 07:24 PM   #6
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Quote:
Originally Posted by PaCman328 View Post
ya if you dont know...hold the dtc button down to acquire dsc haha

No, holding the DTC button down turns off all electronic assistance, neither DTC nor DSC will be active.
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      10-09-2008, 07:05 AM   #7
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maybe you switched out of second too fast and was at too low of a RPM for third gear???

I know it's noobie mistake... but I just had to wonder....

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      10-09-2008, 08:43 AM   #8
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Quote:
Originally Posted by Potty_Pants View Post
Hi guys,

while romping on my car in mexico

(this happened twice so far)

1st gear full throttle (full thrust as expected)
clutch shift to 2nd quickly
2nd gear full throttle (full thrust as expected)
clutch shift to 3rd apparently slowly
3rd gear full throttle it appeared to bog down for a second or two before
the power was built up.

When i first experienced this I thought it was a software bug or a confused component the next time i experienced it I get the feeling that I let off the throttle for 200% more time then i normally do and this is what happens.

am i right ?

thanks

ppp

When you shifted from 2nd to 3rd, what was your RPM in 2nd, and what was the RPM after you shifted to 3rd?
Maybe you let the clutch out when the RPM was too high...the clutch slipped, then gripped and caused the feeling of power loss, then build up for power after it gripped and started pulling.
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      10-10-2008, 08:39 AM   #9
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Thanks for the responses guys most were quite plausible...

The clutch transfer was fine, I know i delayed the switch from gears from 2nd-3rd.

The RPM of 2nd gear was around 6k when i switched to 3rd however the rpms did drop more then normally as compared to 1st to 2nd (my fault). it just didnt seem to recover.

DSC and DTC aside /my mind is fried im married and cant think straight, so cut me some slack

I think Nick is probably correct, if i were to disable all control nannies I believe it will be fine. I tried the similar gear changes with all nannies off and it responded fine . Again this was only one test and additional would be necessary to confirm.

Please note I dont recall ever seeing any flashing traction lights on my dash when i first recorded the concern. *shrug*

Let me put you guys at rest, I've read the stories and know the power of the car, I'm not going to be riding with it off , i dont intend to be another oops rode over a curb, ooops hit a pole, oops oops oops.
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      10-10-2008, 04:06 PM   #10
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^do another run and tell us how it goes....generally I haven't reported seeing any lag at all, even though I have a 6AT.

Turbo lag would be something those TT supras running 25+psi get...or if you're running a single turbo pushing upwards of 15-20+ psi...
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      10-11-2008, 12:38 PM   #11
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Quote:
Originally Posted by Crisp View Post
When you shifted from 2nd to 3rd, what was your RPM in 2nd, and what was the RPM after you shifted to 3rd?
Maybe you let the clutch out when the RPM was too high...the clutch slipped, then gripped and caused the feeling of power loss, then build up for power after it gripped and started pulling.
This seems plausible,
To the OP if you experience the slippage again pull over, get out and see if you can smell anything burnt it might be your clutch.
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