[TheOGSpiff]

Currently driving a F30 N55 and for some reason I can't source the problem where sometimes the car feels weak (slow response or just feels underwhelming) and back to normal after a while. Can someone help me or at least guide me to a solution.


BM3 Stage 1 OTS 93oct
MST intake + turbo inlet
ER charge pipe + boost pipe
VRSF intercooler + catted DP
Swapped my O2 (bank 1)
Swapped to a new battery
Stock midpipe + axel back

213601 Power Management, Quiescent current monitoring: quiescent current injury
(This could be using the wrong fuse for the hardwired dashcam but I have to test it)

118002 Mixture Control: Mixture too rich

102001 Air mass too high

[n55david]

Originally Posted by TheOGSpiff

Currently driving a F30 N55 and for some reason I can't source the problem where sometimes the car feels weak (slow response or just feels underwhelming) and back to normal after a while. Can someone help me or at least guide me to a solution.


BM3 Stage 1 OTS 93oct
MST intake + turbo inlet
ER charge pipe + boost pipe
VRSF intercooler + catted DP
Swapped my O2 (bank 1)
Swapped to a new battery
Stock midpipe + axel back

213601 Power Management, Quiescent current monitoring: quiescent current injury
(This could be using the wrong fuse for the hardwired dashcam but I have to test it)

118002 Mixture Control: Mixture too rich

102001 Air mass too high

boost leak like mad..

mass air high is cause the reading is normal but the map sensor isnt seeing the right amount of air.. and the rich code is cause the fuel system is supplying enough fuel for the amount the mass air sensor says its getting...

[DJSF3014]

Originally Posted by Phantom10R

boost leak like mad..

mass air high is cause the reading is normal but the map sensor isnt seeing the right amount of air.. and the rich code is cause the fuel system is supplying enough fuel for the amount the mass air sensor says its getting...

I was told the air mass is from overboosting?

[n55david]

Originally Posted by DJSF3014

I was told the air mass is from overboosting?

possible sure but not with the other code.and that setup.

[TheOGSpiff]

Originally Posted by Phantom10R

boost leak like mad..

mass air high is cause the reading is normal but the map sensor isnt seeing the right amount of air.. and the rich code is cause the fuel system is supplying enough fuel for the amount the mass air sensor says its getting...

So air mass and mixture fuel should be ok right?

[n55david]

Originally Posted by TheOGSpiff

So air mass and mixture fuel should be ok right?

well mass air is good. fuel mixture is very rich since you have a giant air leak. you need to figure out where and fix it asap.

[thejeremyman9]

Post. Datalogs. Especially one when you feel power is low, and then another one when you feel power is normal.

https://f30.bimmerpost.com/forums/sh....php?t=1732327

[TheOGSpiff]

Originally Posted by thejeremyman9

Post. Datalogs. Especially one when you feel power is low, and then another one when you feel power is normal.

https://f30.bimmerpost.com/forums/sh....php?t=1732327

What parameters should I do or just run it with default parameters.

[thejeremyman9]

Originally Posted by TheOGSpiff

What parameters should I do or just run it with default parameters.

BM3 now has a lot of parameters as default. Just make sure you are logging with the most up to date list.

[TheOGSpiff]

Originally Posted by thejeremyman9

BM3 now has a lot of parameters as default. Just make sure you are logging with the most up to date list.

from 1st gear to 4th to datalog or stay at 3rd 2.5k rpm WOT to 4th?

[n55david]

Originally Posted by TheOGSpiff

from 1st gear to 4th to datalog or stay at 3rd 2.5k rpm WOT to 4th?

do both

[thejeremyman9]

Originally Posted by TheOGSpiff

from 1st gear to 4th to datalog or stay at 3rd 2.5k rpm WOT to 4th?

Did you read my thread?

If you are 8AT, do 4th gear pull from 2500-6000 or 6500. Get 2-3 of those ideally.

One pull from a dig, 1-4th gear, can help too. But the 4th gear pulls are more important.

[TheOGSpiff]

Originally Posted by thejeremyman9

Did you read my thread?

If you are 8AT, do 4th gear pull from 2500-6000 or 6500. Get 2-3 of those ideally.

One pull from a dig, 1-4th gear, can help too. But the 4th gear pulls are more important.

Ill do it right now and ill post it asap thanks

[TheOGSpiff]

Well idk if this is good pulls but i tried.... i can try again tho

https://www.bootmod3.net/log?id=60c1...90c645bff82c88

https://www.bootmod3.net/log?id=60bf...729b4e414fa80f

[SeanFitz335]

Originally Posted by TheOGSpiff

Well idk if this is good pulls but i tried.... i can try again tho

https://www.bootmod3.net/log?id=60c1...90c645bff82c88

https://www.bootmod3.net/log?id=60bf...729b4e414fa80f

Not good. These logs aren't telling much without following proper logging procedure. Follow the link that thejeremyman9 posted above and read the thread on how to take proper logs. Takes some studying and practice but the data they provide when done right is invaluable in these forums.

[TheOGSpiff]

Originally Posted by SeanFitz335

Not good. These logs aren't telling much without following proper logging procedure. Follow the link that thejeremyman9 posted above and read the thread on how to take proper logs. Takes some studying and practice but the data they provide when done right is invaluable in these forums.

Ill give it a try again tm cause its kinda hard finding a spot to do some pulls

[n55david]

Originally Posted by TheOGSpiff

Ill give it a try again tm cause its kinda hard finding a spot to do some pulls

you have to do the full run through a gear otherwise it's useless

[TheOGSpiff]

What about these I just took... Some reason they logged for 30+ seconds


https://www.bootmod3.net/log?id=60c2...729b06337e1234

https://www.bootmod3.net/log?id=60c2...90c608d72b16f8

[n55david]

Originally Posted by TheOGSpiff

What about these I just took... Some reason they logged for 30+ seconds


https://www.bootmod3.net/log?id=60c2...729b06337e1234

https://www.bootmod3.net/log?id=60c2...90c608d72b16f8

something seems off with the duty cycle for.sure up top.

[thejeremyman9]

Originally Posted by TheOGSpiff

What about these I just took... Some reason they logged for 30+ seconds


https://www.bootmod3.net/log?id=60c2...729b06337e1234

https://www.bootmod3.net/log?id=60c2...90c608d72b16f8

In one of the logs you have two knocks at WOT/full boost which is not good. But the other one has none and much better timing...

Your WGDC is way too high for a stage 1 tune. You shouldn't be in the mid to upper 90s. Your boost is also a bit too far off target for what i would consider normal.

The other thing is your STFTs are way off, +10-20%, which doesn't make sense unless you are running a LOT of E85, in which case you shouldn't have knock.

The STFTs, WGDC, and boost off target are all signs to me you have a boost leak. You are probably getting the air mass and rich codes for the same reason. The STFTs could also be from the intake, i'm not sure how much the MST one messes with MAF readings.

Also, your car was barely warm enough to datalog. I would typically wait until ~210F oil temp before doing WOT pulls.

[TheOGSpiff]

Originally Posted by thejeremyman9

In one of the logs you have two knocks at WOT/full boost which is not good. But the other one has none and much better timing...

Your WGDC is way too high for a stage 1 tune. You shouldn't be in the mid to upper 90s. Your boost is also a bit too far off target for what i would consider normal.

The other thing is your STFTs are way off, +10-20%, which doesn't make sense unless you are running a LOT of E85, in which case you shouldn't have knock.

The STFTs, WGDC, and boost off target are all signs to me you have a boost leak. You are probably getting the air mass and rich codes for the same reason. The STFTs could also be from the intake, i'm not sure how much the MST one messes with MAF readings.

Also, your car was barely warm enough to datalog. I would typically wait until ~210F oil temp before doing WOT pulls.

Ill give it another go when again at 210F oil temp but if its just a boost leak ill lyk if it fixed to see if there is any other problem... thanks btw took me months to figure out why sometimes I get weak pulls or just slow response

[thejeremyman9]

Originally Posted by TheOGSpiff

Ill give it another go when again at 210F oil temp but if its just a boost leak ill lyk if it fixed to see if there is any other problem... thanks btw took me months to figure out why sometimes I get weak pulls or just slow response

The oil temp was a side comment. Its going to have no impact on the other parts of the log.

You need to do a pressure / smoke test of the entire system and go from there.