[dbchun]

first time logging parameters, i've been browsing around trying to get a sense of norms but would love your guys input on how things look.

also, i assume there's tons of these threads -- so if there's a sticky or FAQ that's helpful to read/a more appropriate section to post -- please point me in the right direction.


http://datazap.me/u/dbchun/test-run-1?log=0&data=4-6-21


specs:

• 2009 135i N54
• MHD Stage 1
• 91 octane
• otherwise stock
• elevation: ~1200ft
• ambient temp: 94*F

my current n00b conclusions:

• boost looks good with actual close to target
• fuel low pressure sensor needs to be replaced (constantly pegged at 145 psi)
  • I've known about this potential issue from an episode of misfires several months ago but the incident was isolated and the car has been running surprisingly strong and without issue since then.
  • But will replace sensor as I suspect it's affecting AFR and from what I've read, car will run fine and then suddenly fail and start cutting fuel

questions:

• is it normal for AFR to spike so lean in between shifts?
• which datapoints are related to health of my fuel pump? (want to consider E85)
• anything else look out of the ordinary?

really appreciate the help, thanks!

[n54gte]

slight timing corrections on cyl 4,5,6. maybe add in a little e85 to fix that. IAT are getting up there so consider a FMIC. Otherwise, looks ok. LPFP sensor might be messed up but idk. Any 29F3 codes?

Also, do a pull from 3k rpms to 7k and relog.

[dbchun]

yeah, i just pulled the codes and see that "29F3: Fuel pressure sensor, electrical" is there

thanks for the tip, i'll re-log again tonight once the outside temps get a bit cooler

also realized this run was done with traction control on, definitely want to re-log now

[n54door]

LPFP looks to be faulty since it is stuck at the same value across the board.

Timing is pretty low, which indicates it has pulled quite a bit of timing due to either fuel or air temp related values.

Also, log 'Rail Pressure' - this is you HPFP. It will tell you if it is getting strained by the LPFP. If it's less than 1500, you have an issue on the LPFP side.

Get an I/C if you can, your call will appreciate it and the tune will be more effective.

[335NJ]

Parameters & their meanings: http://www.n54tech.com/forums/showthread.php?t=21269

[dbchun]

Originally Posted by n54door

LPFP looks to be faulty since it is stuck at the same value across the board.

Timing is pretty low, which indicates it has pulled quite a bit of timing due to either fuel or air temp related values.

Also, log 'Rail Pressure' - this is you HPFP. It will tell you if it is getting strained by the LPFP. If it's less than 1500, you have an issue on the LPFP side.

Get an I/C if you can, your call will appreciate it and the tune will be more effective.

Originally Posted by 335NJ

Parameters & their meanings: http://www.n54tech.com/forums/showthread.php?t=21269

perfect, thank you!