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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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      05-26-2019, 09:25 PM   #67
weehe126
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Good to know, I went VTT but i'm currently re-tuning for a E35 map
Stage 1, 2 or 2 dbb?
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      05-27-2019, 05:46 AM   #68
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Stage 1, 2 or 2 dbb?
Both, Stage 1 JB hybrid in my daily and i purchased GC DBB last week for the project car. Nothing but good results so far which made me buy the upgraded kit. i have the daily on 20-21psi atm, ive heard good and bad about Pure turbos but its all up to the customer/project i believe.
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      05-27-2019, 01:57 PM   #69
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Both, Stage 1 JB hybrid in my daily and i purchased GC DBB last week for the project car. Nothing but good results so far which made me buy the upgraded kit. i have the daily on 20-21psi atm, ive heard good and bad about Pure turbos but its all up to the customer/project i believe.
Well you would be the first to review the GC kit. Have 30k miles on my PS2 with no complaints. Interested how your experience is.
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      05-27-2019, 06:43 PM   #70
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Originally Posted by DiFFv1 View Post
Both, Stage 1 JB hybrid in my daily and i purchased GC DBB last week for the project car. Nothing but good results so far which made me buy the upgraded kit. i have the daily on 20-21psi atm, ive heard good and bad about Pure turbos but its all up to the customer/project i believe.
Well you would be the first to review the GC kit. Have 30k miles on my PS2 with no complaints. Interested how your experience is.
Same with my Stage 1, No complaints. Do you have a Wide-Band on your car?
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Last edited by DiFFv1; 05-28-2019 at 05:23 AM.. Reason: Auto-Correct**
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      05-27-2019, 06:45 PM   #71
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Same with my Stage 1, No complaints. Do you have a Y-Band on your car?
Idk what you mean by y-band.
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      05-27-2019, 07:46 PM   #72
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Idk what you mean by y-band.
Wide-band maybe?
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      05-27-2019, 08:40 PM   #73
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Idk what you mean by y-band.
Wide-band maybe?
Yes , please excuse my auto correct lol
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      05-27-2019, 10:17 PM   #74
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I have the stock O2 sensor that is wide-band.
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      05-28-2019, 05:26 AM   #75
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I have the stock O2 sensor that is wide-band.
I was speaking of a third o2 sensor bung'd in your DP, But cool. Ill give you updates once the build is finished.
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      05-28-2019, 10:23 PM   #76
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I have the stock O2 sensor that is wide-band.
I was speaking of a third o2 sensor bung'd in your DP, But cool. Ill give you updates once the build is finished.
Why would you want/need a third O2 sensor?
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      05-29-2019, 06:10 AM   #77
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Why would you want/need a third O2 sensor?

Personal Preference*
, But to explain without arguing or going back and forth because this is my opinion.

To monitor EGTs for example, You can get a/f ratio gauge by using them. wideband is much more precise, descriptive, & useful for tuning performance applications than its narrowband counterparts. Narrowband is only good for seeing if you are running lean. Depending on the tune, the AFR reading could be a "corrected" reading in datalogs. As much as the OEM sensors are wideband you can simply hook up an external gauge to them to see. A Wideband/gauge would allow you to set a gauge in the car to offer real time, REAL AFR, with no bias/correction factors, or need for a laptop to view. Widebands are used more by tuners for proper A/F ratio adjustment and so forth. Unless you plan on changing parameters, this would not be a necessity for you personally.

But at the end of the day your car is your car and what you do to it is your preference
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      01-03-2020, 01:39 PM   #78
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I replaced my fuel pressure regulator yesterday and it solved my issue as well. Car fires up immediately.
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