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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Long cranks on cold start. Low rail pressure. Ideas?



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      05-22-2019, 10:55 AM   #45
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Quote:
Originally Posted by DiFFv1 View Post
You didnt seat the locking ring down correctly on either the LPFP side or Regulator side. it should tell you when you read MHD the size of the leak (Sometimes). Take the tools and go counterclockwise first then clockwise to seat the ring evenly.
I am 99% sure the ring is seated correctly, as it took some fiddling to sit correctly. However, I spent far less time with a socket and hammer tightening the rings compared to loosening them (in case something went wrong and I had to get back in there). The regulator side was the hardest with a lot of pushing up on the ring, but it did feel like it was fully seated where it was supposed to be.
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      05-22-2019, 06:44 PM   #46
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Quote:
Originally Posted by SnapCoupe View Post
Quote:
Originally Posted by DiFFv1 View Post
You didnt seat the locking ring down correctly on either the LPFP side or Regulator side. it should tell you when you read MHD the size of the leak (Sometimes). Take the tools and go counterclockwise first then clockwise to seat the ring evenly.
I am 99% sure the ring is seated correctly, as it took some fiddling to sit correctly. However, I spent far less time with a socket and hammer tightening the rings compared to loosening them (in case something went wrong and I had to get back in there). The regulator side was the hardest with a lot of pushing up on the ring, but it did feel like it was fully seated where it was supposed to be.
Check the regulator side, It does have alot of tension
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      Yesterday, 12:30 PM   #47
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Quote:
Originally Posted by DiFFv1 View Post
Check the regulator side, It does have alot of tension
Will do that tonight. Thanks!
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      Yesterday, 03:20 PM   #48
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Is this the correct part I need?

Is this the fuel regulator I need for a 2011 335i xDrive?
https://www.fcpeuro.com/products/bmw...ft-16117163295
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      Yesterday, 04:12 PM   #49
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Is this the fuel regulator I need for a 2011 335i xDrive?
https://www.fcpeuro.com/products/bmw...ft-16117163295
That is correct.
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      Yesterday, 04:17 PM   #50
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Quote:
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That is correct.
Did you notice any other improvements with the regulator swap ?
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      Yesterday, 05:10 PM   #51
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Did you notice any other improvements with the regulator swap ?
Yes, actually. Throttle response feels a lot sharper and there doesn't seem to be as much lag or hesitation when going WOT. Also, before the regulator swap I was experiencing some weird vibrations/oscillations in the lower RPM range, which are now completely gone. Finally, the dip in power/hesitation that I used to feel when going WOT between 4500-5k RPM is completely gone, the upper end of the RPM range feels much stronger.

Here is a Stage 2+ (newest update) log from yesterday. Cleanest log I have seen from my car since I was running Cobb maps back in the day: https://datazap.me/u/geirsenk/stage-...26-27-28-29-30
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      Yesterday, 05:34 PM   #52
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Quote:
Originally Posted by Pladi View Post
Quote:
Originally Posted by SnapCoupe View Post
That is correct.
Did you notice any other improvements with the regulator swap ?
i Vouch for it. It helped my harsh cold starts and Fueling at WOT. I was actually surprised how big of a difference it makes
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      Yesterday, 06:36 PM   #53
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Quote:
Originally Posted by DiFFv1 View Post
i Vouch for it. It helped my harsh cold starts and Fueling at WOT. I was actually surprised how big of a difference it makes
Me too. I only did it to help with my long cranks and stuttering on start up. All the other improvements that came along with it were simply bonuses. Though, it makes me pretty frustrated that I didn't know about this when these symptoms originally started occurring.
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      Yesterday, 06:37 PM   #54
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Quote:
Originally Posted by SnapCoupe View Post
Yes, actually. Throttle response feels a lot sharper and there doesn't seem to be as much lag or hesitation when going WOT. Also, before the regulator swap I was experiencing some weird vibrations/oscillations in the lower RPM range, which are now completely gone. Finally, the dip in power/hesitation that I used to feel when going WOT between 4500-5k RPM is completely gone, the upper end of the RPM range feels much stronger.

Here is a Stage 2+ (newest update) log from yesterday. Cleanest log I have seen from my car since I was running Cobb maps back in the day: https://datazap.me/u/geirsenk/stage-...26-27-28-29-30
Oh dude thats a good log ! Wondering if i should replace it even though i dont have any long cranks. Its weird because the HPFP fixed my long cranks.

So bizarre. Anyways good to know.
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      Yesterday, 10:33 PM   #55
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I did not notice a difference replacing mine and I had 130k miles on it.
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