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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 05-10-2014, 12:27 AM
Jer928 Jer928 is offline
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Turbo lag or transmission slip?

This is my first time owning a turbo car and earlier something strange happened.

I was driving about 50mph in DS mode and floored it WOT, RPMs jumped to around 6000 and acceleration was very slow at 50mph. Speed was increasing but very slow so I let foot off the gas and gave it throttle again and car pulled.

Usually the acceleration is very quick from 50mph at WOT in DS mode.

Not sure if it's transmission slip or just turbo lag. Any other 335i owners experience this or know what this is. No codes/lights on the dash and check is OK. My car is a 2007 335 AT with 80,000 miles.
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  #2  
Old 05-10-2014, 05:39 AM
hondo402000 hondo402000 is offline
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I have not noticed that on my 07 335I AT
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  #3  
Old 05-10-2014, 09:06 AM
Jer928 Jer928 is offline
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Even in DS mode at WOT? It doesn't happen all the time just sometimes.
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  #4  
Old 05-10-2014, 10:26 AM
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fun2drive fun2drive is offline
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Very unlikely turbo lag most likely something else is going on. I would get all codes read and also do a transmission fluid change. Just drain the fluid and refill. Given your situation those two things would be the cheapest way to see what is going on. Life Guard 6 or Mercon SP are the only fluids I know of and Mercon SP is about 3 times cheaper than LG 6.
If there are no codes and the change made no difference might be time to get a good independent to look into the problem. The ZF transmission is very good so unless the fluid level is low could be an issue with the programming.
Be sure to check the fluid level before draining if you choose to do that. Remember that you must have the car running in park then pull the fill plug. If some weeps out at least the level would be correct.
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  #5  
Old 05-10-2014, 10:39 AM
Jer928 Jer928 is offline
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Quote:
Originally Posted by fun2drive View Post
Very unlikely turbo lag most likely something else is going on. I would get all codes read and also do a transmission fluid change. Just drain the fluid and refill. Given your situation those two things would be the cheapest way to see what is going on. Life Guard 6 or Mercon SP are the only fluids I know of and Mercon SP is about 3 times cheaper than LG 6.
If there are no codes and the change made no difference might be time to get a good independent to look into the problem. The ZF transmission is very good so unless the fluid level is low could be an issue with the programming.
Be sure to check the fluid level before draining if you choose to do that. Remember that you must have the car running in park then pull the fill plug. If some weeps out at least the level would be correct.
Just did a drain and fill with a new filter pan about two months ago. No metal shavings found in the fluid. Used ZF lifeguard 6.
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  #6  
Old 05-10-2014, 10:50 AM
Jer928 Jer928 is offline
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Something I should add is this occurred after spirited driving for about 10 minutes with the car kick-downing about 5-6 times in a row before this happening. Maybe the car needed a break to build boost?
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  #7  
Old 05-10-2014, 02:58 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Jer928 View Post
This is my first time owning a turbo car and earlier something strange happened.

I was driving about 50mph in DS mode and floored it WOT, RPMs jumped to around 6000 and acceleration was very slow at 50mph. Speed was increasing but very slow so I let foot off the gas and gave it throttle again and car pulled.

Usually the acceleration is very quick from 50mph at WOT in DS mode.

Not sure if it's transmission slip or just turbo lag. Any other 335i owners experience this or know what this is. No codes/lights on the dash and check is OK. My car is a 2007 335 AT with 80,000 miles.

N54 has no turbo lag - turbos are always on marginal boost or more. In so doing, turbo lag impossible.

OTOH your waste gates may not be 100%, or maybe it's your cam position sensor, or maybe your tranny fluid needs replacement + filter cleaned, or maybe the MAF sensor's boggled, or maybe the crankshaft position sensor's bad, or maybe your Vanos solenoids need cleaning, or....maybe....uh.....maybe you should read codes!

Yessir! Do that and post back, por favor.

Do NOT go to Autozone, Pep Boys, Sears, or their ilk.
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  #8  
Old 05-10-2014, 03:37 PM
Jer928 Jer928 is offline
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Quote:
Originally Posted by CALWATERBOY View Post
N54 has no turbo lag - turbos are always on marginal boost or more. In so doing, turbo lag impossible.

OTOH your waste gates may not be 100%, or maybe it's your cam position sensor, or maybe your tranny fluid needs replacement + filter cleaned, or maybe the MAF sensor's boggled, or maybe the crankshaft position sensor's bad, or maybe your Vanos solenoids need cleaning, or....maybe....uh.....maybe you should read codes!

Yessir! Do that and post back, por favor.

Do NOT go to Autozone, Pep Boys, Sears, or their ilk.
Transmission fluid was serviced two months ago with ZF lifeguard 6 and new pan/filter. I had it scanned by a solus pro reader with no codes. I'm thinking of getting a BT scanner to check for codes. Would you consider the situation where the RPMs jumped to 6000 with my speed increasing slow a sign of slippage?
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  #9  
Old 05-10-2014, 04:08 PM
hondo402000 hondo402000 is offline
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Sounds like something slipping to me
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  #10  
Old 05-10-2014, 04:21 PM
Jer928 Jer928 is offline
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Quote:
Originally Posted by hondo402000 View Post
Sounds like something slipping to me
It doesn't do it every time. Maybe like 1 out of 10.
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  #11  
Old 05-11-2014, 02:24 PM
marius07031 marius07031 is offline
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Quote:
Originally Posted by Jer928 View Post
Transmission fluid was serviced two months ago with ZF lifeguard 6 and new pan/filter. I had it scanned by a solus pro reader with no codes. I'm thinking of getting a BT scanner to check for codes. Would you consider the situation where the RPMs jumped to 6000 with my speed increasing slow a sign of slippage?
you dont need BT Scanner you just need a compatible cable and INPA software and it will read all the codes for you.
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