Single turbo log review - JB4tech.com

Bostons335i · **Single turbo log review -** 04-29-2022, 05:54 PM

Hey all ,

Did some logging I wanted to post here and ask if there was anything I could do on these timing corrections . I’m single turbo pump BEF on 23psi running e30 . I think I may pump that up to maybe e32-32 and see if that helps . Thanks in advanced !
P30_M4_R4_220429_1949.csv

nyt · 04-30-2022, 12:16 PM

You have some significant trims deviation between banks, and bank 2 is the one showing the pulls. I'd start looking there. Your low pressure fuel system shows signs it's approaching its limit as well.

Bostons335i · 04-30-2022, 01:58 PM

Quote:

Originally Posted by nyt

You have some significant trims deviation between banks, and bank 2 is the one showing the pulls. I'd start looking there. Your low pressure fuel system shows signs it's approaching its limit as well.

Hey thanks for the reply ! I’m sorta new to this what exactly should I be checking? I will say the plugs , coils , and o2 sensors arnt too old and I just actually pulled them to check them and they looked good . Anything or anywhere specifically I should be looking ? Also every time I up the CPI kit the divination seems to get worse ? I still unsure why and haven’t got much help from posting . I’m going to get another smoke test to see if there’s a leak .

Cannon @ BMS · 05-01-2022, 01:53 PM

What index are your injectors? Pull them and check to see if you have leaky/clogged injectors.

Bostons335i · 05-01-2022, 04:58 PM

Hey ,

They are all index 12s , I pulled the plugs the other day and they were all dry (was checking for a leaky injector). Wouldn’t a clogged injector show some funny things on a log / have drivability issues ? Thank you !

Bostons335i · 05-02-2022, 04:20 PM

Here’s some new logs timing looks wayyyy better

P30_M4_R2_220502_1855.csv

Cannon @ BMS · 05-04-2022, 10:42 AM

Fuel trim variance is still pretty consistent. I also notice that your LPFP could use an upgrade. It's starting to crash up top (I wouldn't give it any more power on that pump). It would also appear your AFR keeps trying to correct itself. O2's could need a change. Before you do that though, pull the injectors and see if they are clogged.

Bostons335i · 05-15-2022, 12:16 AM

Got around to actually buying a smoke machine (no shop near me had one) did find a small leak on the BOV adapter but no where else major (was thinking there was a possible leak at manifold . The o2 sensors are only a couple months old (replaced then when I installed the single kit). Does anyone else have any suggestions on what to check or replace ?

Hoping Steve may be able to chime in , the fuel trim deviation occurs with increasing the CPI %. I’ve sent some pics over to Terry to make sure the injector location is good and it is (using bms charge pipe) lmk if anyone has any other suggestions ? Sorta stumped . I’ll get new logs soon weather is bad up here now and see if that boost leak changed anything .

Bostons335i · 05-17-2022, 05:02 PM

New log after boost leak fixed still have the deviation any thoughts ?P30_M4_R1_220517_1907.csv

VoIPNerd · 05-17-2022, 07:13 PM

Note that the trim variance begins when CPI kicks in. I had this same trim variance with CPI using E85 and it went away when I upgraded to full port injection.

Bostons335i · 05-17-2022, 07:17 PM

Quote:

Originally Posted by VoIPNerd

Note that the trim variance begins when CPI kicks in. I had this same trim variance with CPI using E85 and it went away when I upgraded to full port injection.

Hey ! Thank you so much for the information . I sorta started to figure that after so many logs and there really be no other reason for the variance , is it anything to be concerned about? Thank you !