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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 > Strange surge on highway



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      03-17-2007, 08:24 AM   #1
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Strange surge on highway

ok, today was the second day of getting on the car after my break in period.

I downed it to 3rd gear on the highway and pushed the car to 6500 rpm.

As the rpms climbed, the engine felt like it was surging. It wasn't a smooth climb.

Anyone know why this is happening???

The temperature out this morning was 63 degrees, and I let the car reach 200 degrees oil temp prior to stomping it.
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      03-17-2007, 08:36 AM   #2
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Quote:
Originally Posted by razormy View Post
ok, today was the second day of getting on the car after my break in period.

I downed it to 3rd gear on the highway and pushed the car to 6500 rpm.

As the rpms climbed, the engine felt like it was surging. It wasn't a smooth climb.

Anyone know why this is happening???

The temperature out this morning was 63 degrees, and I let the car reach 200 degrees oil temp prior to stomping it.
I have gotten that a few times, I think its the turbos really kicking in.....in other words, not even BMW can perfectly hide the turbos. Also, know that the gas pedal is very sensitive (like the E46 M3 in sport mode) so if you just push a little harder on the gas or let up just a little you can REALLY feel the difference.

Hope that helps.....
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      03-17-2007, 09:02 AM   #3
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I have gotten that a few times, I think its the turbos really kicking in.....in other words, not even BMW can perfectly hide the turbos. Also, know that the gas pedal is very sensitive (like the E46 M3 in sport mode) so if you just push a little harder on the gas or let up just a little you can REALLY feel the difference.

Hope that helps.....
thanks
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      03-17-2007, 11:14 AM   #4
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VTEC kicked in yo!!!

Same thing happens even in the 325. Once you pass 4500 or so, it puts out huge power. Maybe Vanos is switching around there.. I like that rush a lot though..
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      03-17-2007, 12:43 PM   #5
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Did you break it in lightly? Maybe its your car begging you to keep it light again. From now on its going to respond with "you took it easy breaking me in, now you want me to do what?" Shoulda broke it in the way you intend on driving it IMO of course.
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      03-17-2007, 01:23 PM   #6
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Did you break it in lightly? Maybe its your car begging you to keep it light again. From now on its going to respond with "you took it easy breaking me in, now you want me to do what?" Shoulda broke it in the way you intend on driving it IMO of course.
Oh no, please dont let this thread turn into another break in discussion.
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      03-17-2007, 01:30 PM   #7
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yeah...

Quote:
Originally Posted by HyperM3 View Post
Did you break it in lightly? Maybe its your car begging you to keep it light again. From now on its going to respond with "you took it easy breaking me in, now you want me to do what?" Shoulda broke it in the way you intend on driving it IMO of course.
I also think it may be the computer re-adjusting to the new driving style.
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      03-17-2007, 01:32 PM   #8
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Oh no, please dont let this thread turn into another break in discussion.
I was joking in a sarcastic manner. I agree about not turing this into a break-in thread.
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