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M135i EWG Tuning Advice - JB4 + MHD BEF

4K views 32 replies 3 participants last post by  Tib1 
#1 ·
Hi all,

I have had my M135i EWG for a while now and have lightly modified with; JB4 EWG, downpipe, BMS intake, forge boost pipe (original broke).

I have just ordered a K+DCAN cable as I intend now to use either the MHD on its own, or the JB4+MHD with BMS BEF.

I have a few questions;
1. Would the best option be to use the MHD on its own, or the JB4+MHD with BMS BEF? Please explain why either option is better than the other.
2. I currently have the Fuel Flex plug disconnected, and do not have the extra EWG wires for my JB4. With my mods will I benefit from adding the EWG wires and connecting the FF connectors?
3. If I change to the JB4+MHD with BMS BEF option, do I still need to add the EWG wires and connect up the FF connectors?
4. Are there any other 'must do' or supporting mods, or serviceable items that should be replaced, that people would suggest with my current setup, and to go with the JB4+MHD with BMS BEF option?
5. Am I likely to benefit from things like replacing boost solenoids, or upgrading the original diverter valve? My car has covered 52k miles.

In addition to this, any other general advice that people think is particularly useful that I may not already know would be appreciated.

Thanks in advance for any help/advice!

Ash
 
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#2 ·
Ash,

Ref yr questions

1. - have a read of this BB thread - ;

2. - Yes - w/o FF and EWG extra harnesses you won't get best out of absolute maps ie map 5 and map 6 [if you intend to get yr car custom mapped]. Currently, your car is configured for additive maps only, maps 1 & 2. With yr mods and FF + EWG add-on harnesses, you will see higher boost/more aggressive timing with absolute maps. No brainer for me.

3. If thinking about MHD BEF + JB4, w/o FF and EWG harnesses you will be wasting your money as you see minimal gains if any compared to maps 1 & 2.

4. if running above 16.5psi / ~1.1 bar - to mitigate heatsoak - consider upgrading your stock intercooler. I also chose to upgrade my inlet pipe to remove OEM restriction - helped with throttle response and reduced load on the turbo even when running higher boost.

5. if running above:-17psi/~1.2bar then stock divertor may cause inconsistencies in boost from mid to upper rev range - consider upgrading to GFB DV+ and install at same time as intercooler upgrade aas it will be easier to access.
 
#3 ·
Blind Pugh said:
Ash,

Ref yr questions

1. - have a read of this BB thread - ;

2. - Yes - w/o FF and EWG extra harnesses you won't get best out of absolute maps ie map 5 and map 6 [if you intend to get yr car custom mapped]. Currently, your car is configured for additive maps only, maps 1 & 2. With yr mods and FF + EWG add-on harnesses, you will see higher boost/more aggressive timing with absolute maps. No brainer for me.

3. If thinking about MHD BEF + JB4, w/o FF and EWG harnesses you will be wasting your money as you see minimal gains if any compared to maps 1 & 2.

4. if running above 16.5psi / ~1.1 bar - to mitigate heatsoak - consider upgrading your stock intercooler. I also chose to upgrade my inlet pipe to remove OEM restriction - helped with throttle response and reduced load on the turbo even when running higher boost.

5. if running above:-17psi/~1.2bar then stock divertor may cause inconsistencies in boost from mid to upper rev range - consider upgrading to GFB DV+ and install at same time as intercooler upgrade aas it will be easier to access.
Thanks for the response, some very helpful info. Will get the EWG harness ordered. So from what you have said, the jb4 will still use the hard wired connections to sensors with the BEF loaded to adjust parameters, it won't communicate directly to the DME via the OBD2 port?

Also when you refer to 'inlet pipe' I presume you mean the air intake?

Ash

Sent from my iPhone using Tapatalk
 
#4 ·
Ash_Webb said:
Blind Pugh said:
Ash,

Ref yr questions

1. - have a read of this BB thread - ;

2. - Yes - w/o FF and EWG extra harnesses you won't get best out of absolute maps ie map 5 and map 6 [if you intend to get yr car custom mapped]. Currently, your car is configured for additive maps only, maps 1 & 2. With yr mods and FF + EWG add-on harnesses, you will see higher boost/more aggressive timing with absolute maps. No brainer for me.

3. If thinking about MHD BEF + JB4, w/o FF and EWG harnesses you will be wasting your money as you see minimal gains if any compared to maps 1 & 2.

4. if running above 16.5psi / ~1.1 bar - to mitigate heatsoak - consider upgrading your stock intercooler. I also chose to upgrade my inlet pipe to remove OEM restriction - helped with throttle response and reduced load on the turbo even when running higher boost.

5. if running above:-17psi/~1.2bar then stock divertor may cause inconsistencies in boost from mid to upper rev range - consider upgrading to GFB DV+ and install at same time as intercooler upgrade aas it will be easier to access.
Thanks for the response, some very helpful info. Will get the EWG harness ordered. So from what you have said, the jb4 will still use the hard wired connections to sensors with the BEF loaded to adjust parameters, it won't communicate directly to the DME via the OBD2 port?

Also when you refer to 'inlet pipe' I presume you mean the air intake?

Ash
Ash

Ordering EWG harness - good plan

BEF/JB4 - no - BEF recalibrated DME stock parameters to allow JB4 absolute maps to be more effective at getting the most out of n55. If you haven't trawled n54tech forum then save this link to your favourites re mhd BEF/JB4


Inlet pipe - not the intake end but the other end of inlet pipe where it connects to turbo - to avoid repeating myself - use search function and type in "inlet" and my username.

BP
 
#5 ·
Blind Pugh said:
Ash_Webb said:
Blind Pugh said:
Ash,

Ref yr questions

1. - have a read of this BB thread - ;

2. - Yes - w/o FF and EWG extra harnesses you won't get best out of absolute maps ie map 5 and map 6 [if you intend to get yr car custom mapped]. Currently, your car is configured for additive maps only, maps 1 & 2. With yr mods and FF + EWG add-on harnesses, you will see higher boost/more aggressive timing with absolute maps. No brainer for me.

3. If thinking about MHD BEF + JB4, w/o FF and EWG harnesses you will be wasting your money as you see minimal gains if any compared to maps 1 & 2.

4. if running above 16.5psi / ~1.1 bar - to mitigate heatsoak - consider upgrading your stock intercooler. I also chose to upgrade my inlet pipe to remove OEM restriction - helped with throttle response and reduced load on the turbo even when running higher boost.

5. if running above:-17psi/~1.2bar then stock divertor may cause inconsistencies in boost from mid to upper rev range - consider upgrading to GFB DV+ and install at same time as intercooler upgrade aas it will be easier to access.
Thanks for the response, some very helpful info. Will get the EWG harness ordered. So from what you have said, the jb4 will still use the hard wired connections to sensors with the BEF loaded to adjust parameters, it won't communicate directly to the DME via the OBD2 port?

Also when you refer to 'inlet pipe' I presume you mean the air intake?

Ash
Ash

Ordering EWG harness - good plan

BEF/JB4 - no - BEF recalibrated DME stock parameters to allow JB4 absolute maps to be more effective at getting the most out of n55. If you haven't trawled n54tech forum then save this link to your favourites re mhd BEF/JB4


Inlet pipe - not the intake end but the other end of inlet pipe where it connects to turbo - to avoid repeating myself - use search function and type in "inlet" and my username.

BP
Thanks, that makes more sense why the EWG and FF connections will still benefit me then with BEF.

Am I right in thinking that the BEF map will still auto adjust in a similar way as map5 does? Or will it require a large amount of time to set up and tweak?

Will take a look at the link and also have a look at the turbo inlet pipe, did think you meant something other than the air intake!

Cheers Ash.

Sent from my iPhone using Tapatalk
 
#6 ·
#7 ·
Blind Pugh said:
Ash

BEF fettled DME still adapts/learns up & downto suit fuel/driving style and ambient conditions. Map 5 is an absolute JB4 - totally separate from MHD BEF - which auto tunes to try optimise JB4 to DME calibrations.

Wrt intake mods - see my B.B. post on fettling I did on my m135i


BP
Appreciate the help [emoji1303]

Sent from my iPhone using Tapatalk
 
#10 ·
Blind Pugh said:
Ash,

Its normal although some [incl myself] wrapped loom wires with tape and then routed loom behind heatshielding you see in yr second photo - I had no issues with these wires on my JB4'd m135i.

BP
Thanks, will look at protecting the wires.

So fitted the EWG harness and connected up the FF wires too, switched to map 5.
Drove the car this morning, definitely feels smoother i think, but I'm not making as much boost as i did previously on map 2?
Getting approx. 9-10 psi on map 5, where i was getting 14-15 psi on map 2, any ideas?

Cheers Ash
 
#11 ·
Ash,

If you switch back to map 2 do you still get 14-15psi v 9-10psi of map 5 ?

Have you done any WOT pulls - say at least 3-4 so both DME learning and JB4 map 5 auto-tune trends upwards ?

Are you running latest EWG SW in JB4 ?

Also, maybe a good idea to do throttle body adaption reset.

Happy to look over any data logs you have of either map 2 or map 5. I'd suggest you log data in map 4 so as you create a baseline with jb4 off in monitoring mode so as you can compare/contrast data from other boosted maps.

BP
 
#12 ·
Blind Pugh said:
Ash,

If you switch back to map 2 do you still get 14-15psi v 9-10psi of map 5 ?

Have you done any WOT pulls - say at least 3-4 so both DME learning and JB4 map 5 auto-tune trends upwards ?

Are you running latest EWG SW in JB4 ?

Also, maybe a good idea to do throttle body adaption reset.

Happy to look over any data logs you have of either map 2 or map 5. I'd suggest you log data in map 4 so as you create a baseline with jb4 off in monitoring mode so as you can compare/contrast data from other boosted maps.

BP
Just about to go on lunch so will try map2 again and see what happens.

Did quite a few WOT pulls this morning on way to work, but maybe that wasn't enough?

Updated to firmware v15 the other day so on latest version

Did a TBA reset couple of days ago, should i do it again?

Also just had a look at my settings on the laptop and noticed a few things:
1. Last safety triggered was 'Boost over safety'. Boost safety was set at 18psi should i raise this, could this have caused a lower boost level?
2. FF / Wastegate adaption was set at the default of 60, but has changed itself to 71, is this normal?
3. I keep getting fault code '102001 Air mass, plausibility - Tuner code, ignore' returning, could this mean i have an issue somewhere?
4. Also average ignition is 2.1, is this ok?

Will get my laptop set up over next few days to do some logs.

Cheers
 
#13 ·
Ash_Webb said:
Blind Pugh said:
Ash,

If you switch back to map 2 do you still get 14-15psi v 9-10psi of map 5 ?

Have you done any WOT pulls - say at least 3-4 so both DME learning and JB4 map 5 auto-tune trends upwards ?

Are you running latest EWG SW in JB4 ?

Also, maybe a good idea to do throttle body adaption reset.

Happy to look over any data logs you have of either map 2 or map 5. I'd suggest you log data in map 4 so as you create a baseline with jb4 off in monitoring mode so as you can compare/contrast data from other boosted maps.

BP
Just about to go on lunch so will try map2 again and see what happens.

Did quite a few WOT pulls this morning on way to work, but maybe that wasn't enough?

Updated to firmware v15 the other day so on latest version

Did a TBA reset couple of days ago, should i do it again?

Also just had a look at my settings on the laptop and noticed a few things:
1. Last safety triggered was 'Boost over safety'. Boost safety was set at 18psi should i raise this, could this have caused a lower boost level?
2. FF / Wastegate adaption was set at the default of 60, but has changed itself to 71, is this normal?
3. I keep getting fault code '102001 Air mass, plausibility - Tuner code, ignore' returning, could this mean i have an issue somewhere?
4. Also average ignition is 2.1, is this ok?

Will get my laptop set up over next few days to do some logs.

Cheers
Ash

TBA reset/FW update - sounds ok

Tuner code - not an issue.

Boost safety cap - 18psi - leave as-is & has error code been cleared ?

WG adaption - drift from 60 to 71 is fine and typical for map 5 as it learns

Avg ign - the lower the value between 0-5 is best and an indicator of fuel quality in terms of octane. SUL is 2-3.5 so 2.1 is good for pump fuel

BP
 
#14 ·
Blind Pugh said:
Ash_Webb said:
Blind Pugh said:
Ash,

If you switch back to map 2 do you still get 14-15psi v 9-10psi of map 5 ?

Have you done any WOT pulls - say at least 3-4 so both DME learning and JB4 map 5 auto-tune trends upwards ?

Are you running latest EWG SW in JB4 ?

Also, maybe a good idea to do throttle body adaption reset.

Happy to look over any data logs you have of either map 2 or map 5. I'd suggest you log data in map 4 so as you create a baseline with jb4 off in monitoring mode so as you can compare/contrast data from other boosted maps.

BP
Just about to go on lunch so will try map2 again and see what happens.

Did quite a few WOT pulls this morning on way to work, but maybe that wasn't enough?

Updated to firmware v15 the other day so on latest version

Did a TBA reset couple of days ago, should i do it again?

Also just had a look at my settings on the laptop and noticed a few things:
1. Last safety triggered was 'Boost over safety'. Boost safety was set at 18psi should i raise this, could this have caused a lower boost level?
2. FF / Wastegate adaption was set at the default of 60, but has changed itself to 71, is this normal?
3. I keep getting fault code '102001 Air mass, plausibility - Tuner code, ignore' returning, could this mean i have an issue somewhere?
4. Also average ignition is 2.1, is this ok?

Will get my laptop set up over next few days to do some logs.

Cheers
Ash

TBA reset/FW update - sounds ok

Tuner code - not an issue.

Boost safety cap - 18psi - leave as-is & has error code been cleared ?

WG adaption - drift from 60 to 71 is fine and typical for map 5 as it learns

Avg ign - the lower the value between 0-5 is best and an indicator of fuel quality in terms of octane. SUL is 2-3.5 so 2.1 is good for pump fuel

BP
Thanks, will check if the boost over safety has been cleared.

Im using Momentum 99 fuel

Went for a drive at lunch, set back to map2 and i was getting 14-15psi again, until i got a 'drivetrain malfunction' on WOT, however this seemed to clear itself instantly?

Will do some logs on map4, map2, and map5 and post back here.

Thanks, Ash.
 
#16 ·
Ash_Webb said:
Just plugged in the laptop again to check codes after the little hickup when i drove it earlier.

I now have code '119404 Rail pressure sensor, signal stuck'

Seen this before?
Not personally no. Quick search c/o of Google & I found this for you
....."119404 Rail pressure sensor, signal permanently stuck". Some details from ISTA:
Quote:

Check lines and plug connections between the following components:
- DME.
- Rail pressure sensor.
My read of this is yr FF wire loom or just connections is/are the issue and suggest the following:-

- check FF harness connections at both ends oe where it connects into JB4 and onto HPF rail sensor - perhaps unplug and re-plug FF harness at HPF rail end;
- clear codes with JB4
- do some WOT pulls in map 2 or 5 to see dash error comes again
- if no all good - have fun;
- if not, unplug FF harness and put to back OEM and try WOT pulls on map 1 or map 4 to see if error msg re-appears on the dash or not. If OK then its likely to be FF harness
 
#17 ·
Ok, so i checked the FF connectors when leaving work, i cant see any corrosion on the connections and theyre definitely on properly.

I have cleared codes, i then got two codes '119001 Rail sensor short circuit +' and '13E201 Suspected VANOS fault'.

I have done some logs in Map4, Map2, and Map5.

I have noticed that FF / Wastegate adaption has shot up to 114, and average ignition up to 3.3.

From the logs in Map5 it seems that boost is consistently under target by a few psi.
Trims seem to be around 25 is this low?

Im not expert so would you mind taking a look at the logs to see what you think?


Thanks.
 
#20 ·
Ash

Links to JB4 forum parameters & bible - save to favourites as both are useful read.



If PWM is low value that's a good sign and av ign is trending up from low 2's to mid 3's then that's a sign that octane levels in the fuel is declining.

FF /WG adaption - trending to zero in map 2 is ok but try resetting it default setting of 60

109E11CF-ADD5-4E96-96C2-5E63EEBF94CD.jpeg


BP

BP
 
#21 ·
Thanks for the response BP, I just thought that if boost is below target then WGDC would be higher?

On all of my logs i get no values for FF or fuel pressure low, could this point to an issue with my FF wiring?

Will try resetting FF/WG adaption to 60, have also been recommended to set all duty bias values to 50 and do some more logs.

Cheers.
 
#22 ·
Ash_Webb said:
Thanks for the response BP, I just thought that if boost is below target then WGDC would be higher?

On all of my logs i get no values for FF or fuel pressure low, could this point to an issue with my FF wiring?

Will try resetting FF/WG adaption to 60, have also been recommended to set all duty bias values to 50 and do some more logs.

Cheers.
Ash

Your logic is correct - underboosting means WGDC value (boost solenoid %age closure) will increase.

Is LPFP reading low even when you disconnect FF wires ?

BP
 
#23 ·
Blind Pugh said:
Ash_Webb said:
Thanks for the response BP, I just thought that if boost is below target then WGDC would be higher?

On all of my logs i get no values for FF or fuel pressure low, could this point to an issue with my FF wiring?

Will try resetting FF/WG adaption to 60, have also been recommended to set all duty bias values to 50 and do some more logs.

Cheers.
Ash

Your logic is correct - underboosting means WGDC value (boost solenoid %age closure) will increase.

Is LPFP reading low even when you disconnect FF wires ?

BP
Thought so, thats why i find it strange that WGDC is below 20 at all times.

Havent actually tried, ill disconnect the FF wires and do a log and see if i get LPFP readings and also see if boost is closer to target.

Cheers, Ash.
 
#24 ·
I have changed all duty bias to 50 as has been suggested on N54Tech, no more fault codes have appeared, WGDC seems more normal, I'm now actually getting FF values on the logs too.

Car feels like it pulls a harder than it did before and feels smoother as well.

Boost seems to hold much closer to target than it did before, but do you think the target seems a bit low considering my mods and settings?

Average ignition has gone up again, and also FF / Wastegate Adaption has shot back up to 125 after setting it back to default.

Also still getting no values for fuel pressure low.

Do you still think there could be issues with the FF wiring now that I'm actually getting FF values on the logs? I havent actually had a chance yet to remove the FF wires and see if i get LPFP readings as the car was too hot.

Logs attached, what do you think is the next step for further improvements?


Thanks, Ash :)
 
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