N54Tech.com - International Turbo Racing Discussion
(#1)
Old
JapSpec JapSpec is offline
Junior Member
 
Posts: 114
Join Date: Feb 2016
Car: 135i
Default n54 Single turbo Misfire at high RPM - 09-13-2019, 05:31 AM

i've been having a misfire issue when i pass 6700 rpm. on Map 5
the setup is a 07 335i automamatic
JB4/MHD
JP workz 6266 turbo
BMP port injection with JB4 PI controller
BMP stage 3 LPFP
VRSF Race Intercooler
VRSF Chargepipe
3.5 Tmap BMS harness
BL coil / NGK 2 step colder plug gap to 0.20
Fuel E85

i can see that my LPFP is not that healty i have a new walbro 450 pump coming so ill replace that.
but maybe you guys can see something else what could it be
Attached Files
File Type: csv 2019-09-12 22_48_06_Map-5.csv (9.7 KB, 57 views)
Reply With Quote
(#2)
Old
Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
Super Moderator
 
Posts: 8,425
Join Date: Apr 2014
Car: E92 335XI
Default 09-15-2019, 09:55 PM

Does the miss happen on lower boost maps?


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
Reply With Quote
(#3)
Old
JapSpec JapSpec is offline
Junior Member
 
Posts: 114
Join Date: Feb 2016
Car: 135i
Default 09-16-2019, 04:49 AM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Does the miss happen on lower boost maps?
no not really on map 2 map 3 is good. map 4 sometimes it does misfire.
Reply With Quote
(#4)
Old
Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
Super Moderator
 
Posts: 8,425
Join Date: Apr 2014
Car: E92 335XI
Default 09-16-2019, 12:42 PM

Have you tried closing your plug gap a bit? .018


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
Reply With Quote
(#5)
Old
JapSpec JapSpec is offline
Junior Member
 
Posts: 114
Join Date: Feb 2016
Car: 135i
Default 09-16-2019, 07:08 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Have you tried closing your plug gap a bit? .018
Yes I have now on .018 still same
Reply With Quote
(#6)
Old
Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
Super Moderator
 
Posts: 8,425
Join Date: Apr 2014
Car: E92 335XI
Default 09-16-2019, 10:10 PM

Misfire might be fuel related, although your HPFP looks really solid up top.

How longs it been doing it?

Could be false Knock too, especially at your boost levels...knock sensors still on?


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
Reply With Quote
(#7)
Old
JapSpec JapSpec is offline
Junior Member
 
Posts: 114
Join Date: Feb 2016
Car: 135i
Default 09-17-2019, 01:23 AM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Misfire might be fuel related, although your HPFP looks really solid up top.

How longs it been doing it?

Could be false Knock too, especially at your boost levels...knock sensors still on?

when you said fuel related. what you mean by that? and is there adjustment I should I change on fuel bias?
itís been misfire since I been running higher boost than 20psi
but if shift it 6500 rpm no misfire anything higher it will.

and yes knock sensor still on.
Reply With Quote
(#8)
Old
Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
Super Moderator
 
Posts: 8,425
Join Date: Apr 2014
Car: E92 335XI
Default 09-20-2019, 07:25 AM

Fuel related meaning it could be, never rule it out- but as stated your HPFP values look solid & it looks like you’ll be replacing your walbro.

To me it almost seems like it could be false knock causing the misfire


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
Reply With Quote
(#9)
Old
JapSpec JapSpec is offline
Junior Member
 
Posts: 114
Join Date: Feb 2016
Car: 135i
Default 09-20-2019, 07:37 AM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Fuel related meaning it could be, never rule it out- but as stated your HPFP values look solid & it looks like youíll be replacing your walbro.

To me it almost seems like it could be false knock causing the misfire
thanks Dave, i just replace my LPFP it seem to be good now. but Misfire still happen.
is there a way to diagnose the false knock? and what could it be the causing of the false Knock?
Attached Files
File Type: csv 2019-09-18 22_36_45_Map-4.csv (7.8 KB, 48 views)

Last edited by JapSpec; 09-20-2019 at 08:01 AM..
Reply With Quote
(#10)
Old
Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
Super Moderator
 
Posts: 8,425
Join Date: Apr 2014
Car: E92 335XI
Default 09-20-2019, 09:41 AM

Quote:
Originally Posted by JapSpec
thanks Dave, i just replace my LPFP it seem to be good now. but Misfire still happen.
is there a way to diagnose the false knock? and what could it be the causing of the false Knock?
What clutch are you using- is it a DMFW?

index injectors?


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
Reply With Quote
(#11)
Old
JapSpec JapSpec is offline
Junior Member
 
Posts: 114
Join Date: Feb 2016
Car: 135i
Default 09-21-2019, 04:51 AM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
What clutch are you using- is it a DMFW?

index injectors?

It's a automatic with xhp stage 3 flash.
Index 12 injectors
Reply With Quote
(#12)
Old
Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
Super Moderator
 
Posts: 8,425
Join Date: Apr 2014
Car: E92 335XI
Default 09-23-2019, 07:24 AM

We may want to try pulling your cyl 6 injector & swapping it to say 5.

I wonder if your cyl 6 injector flow is off


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump




vBulletin Skin developed by: vBStyles.com
Copyright © 2007 - 2020, N54tech.com