JB4tech.com - International Turbo Tuning Discussion
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Default 02-26-2020, 06:28 PM

Quote:
Originally Posted by blown07
Your bank 1 AFR looks very jumpy to me...this may be causing your big timing drop mid run. WGDC also looks strange the way it is climbing. My car has a pretty much flat WGDC - Stage 1's turbos but not that different than stock. Perhaps you have a boost leak. I reduced my FOL (only to 35) like Steve suggested you do but I need to take it down further as my trims are much lower than yours. I can post my most recent run if you would like for comparison (ran 3.35 to 60 - best ever)

On behalf of, um, everyone, I wish to see them.
That is seriously epic time!

No sig? I need to see mods.
Also, curious if you run a Draggy?




2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual CM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
RB: Inlets | PCV Valve
VRSF: DiPis | CP
HKS BOV
xHP Stage 3
NGK-97506 @ .020

Maintenance:
2018 - A/T Replaced | Ign Coils | Walnut Blast
2019 - Index 12 Injectors | VCG | OFHG & O-rings | TStat
2020 - OPG | Battery | IBS | Water Pump | Plugs | Alternator
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Bbelstad Bbelstad is offline
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Default 02-26-2020, 06:44 PM

Quote:
Originally Posted by codesx
On behalf of, um, everyone, I wish to see them.
That is seriously epic time!

No sig? I need to see mods.
Also, curious if you run a Draggy?
What he said.


Brandon
Hayden, Idaho.

* 08' 535I. * JB4 W/ Bluetooth Connect & custom tune. * Billy Boat 535I 3.5" *****-back exhaust W/ resonator delete. * BMS DCI. * NGK 2 step colder plugs @ .020" (And I mean .020" on money!). * New Eldor coils. * BMS BOV adapter and BMS Vac side OCC. * BMS Chargepipe. * TIAL BOV W/ Hard 1/4" Vacuum line W/stock spring. * XHP Stage 2 * C-@-T TUBES.





[/SIGPIC]
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Default 02-26-2020, 07:48 PM

Dragy vid from a couple day ago. First attempt with the Sutphin trans flash. Also attached is the log with worse negative trims than OP.

https://youtu.be/KTfPD6dgB6Y
Attached Files
File Type: csv 11.38 .csv (22.9 KB, 178 views)


335i FBO,Meth,JB4,Sutphin flash,LSD,GCLites 11.25@127.4 on NT05R

335xi FBO,Meth,JB4,Sutphin flash,VTT stage1 11.38 1/4 - 7.30 1/8th - 3.35 0 to 60 @ 0C
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Default 02-26-2020, 08:39 PM

DAMNNN!!!!!


Brandon
Hayden, Idaho.

* 08' 535I. * JB4 W/ Bluetooth Connect & custom tune. * Billy Boat 535I 3.5" *****-back exhaust W/ resonator delete. * BMS DCI. * NGK 2 step colder plugs @ .020" (And I mean .020" on money!). * New Eldor coils. * BMS BOV adapter and BMS Vac side OCC. * BMS Chargepipe. * TIAL BOV W/ Hard 1/4" Vacuum line W/stock spring. * XHP Stage 2 * C-@-T TUBES.





[/SIGPIC]
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Default 02-27-2020, 10:49 AM

Quote:
Originally Posted by blown07
Your bank 1 AFR looks very jumpy to me...this may be causing your big timing drop mid run. WGDC also looks strange the way it is climbing. My car has a pretty much flat WGDC - Stage 1's turbos but not that different than stock. Perhaps you have a boost leak. I reduced my FOL (only to 35) like Steve suggested you do but I need to take it down further as my trims are much lower than yours. I can post my most recent run if you would like for comparison (ran 3.35 to 60 - best ever)
thank you for your reply, Im pretty sure my wastegates are adjusted correct as one was off when I got the snails replaced so both were adjusted to spec.

I dont think I have any leaks though..

yes you can post your log


E92 N54 2007 (kline)
ER Chargepipe + TIAL BOV with 1/4" tapped manifold , MMP IN & OUTlets, Chargepipe CM10 nozzle with 93% Ethanol(soon going pure meth) , JB4 MHD custom map 6, Shell Vpower 100 , D.P + straightpipes, 5" stepped wagner FMIC , 0.5 mm NGK 95770

öhlins shocks & springs , M3 swaybar front & other M3 bits, PCV lowside: Misimoto ccan Ext RB blocked ports, highside: BMS ccan , Solid Diff Brace, 20" wheels,Android HU,
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Default 02-27-2020, 11:45 AM

Quote:
Originally Posted by Nordic335IM3
thank you for your reply, Im pretty sure my wastegates are adjusted correct as one was off when I got the snails replaced so both were adjusted to spec.

I dont think I have any leaks though..

yes you can post your log
Maybe do a pressure test to be sure.
Log is posted above.

@Bbelstad - Cheers


335i FBO,Meth,JB4,Sutphin flash,LSD,GCLites 11.25@127.4 on NT05R

335xi FBO,Meth,JB4,Sutphin flash,VTT stage1 11.38 1/4 - 7.30 1/8th - 3.35 0 to 60 @ 0C
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Default 03-02-2020, 06:56 AM

Quote:
Originally Posted by blown07
Your bank 1 AFR looks very jumpy to me...this may be causing your big timing drop mid run. WGDC also looks strange the way it is climbing. My car has a pretty much flat WGDC - Stage 1's turbos but not that different than stock. Perhaps you have a boost leak. I reduced my FOL (only to 35) like Steve suggested you do but I need to take it down further as my trims are much lower than yours. I can post my most recent run if you would like for comparison (ran 3.35 to 60 - best ever)
Did a run 3/4 th gear.. I see the WGDC increasing as the boost increase..I still dont think there is any boost leaks, but I will try swapping out the airfilters with something better flowing as I suspect there may be a restriction there.

Also I will check the look of the sparkplugs

and get hold of some real METH for the Chargepipe instead of the Ethanol/water mix Im using
Attached Files
File Type: csv 20200302_1402_runs(1).csv (24.7 KB, 209 views)


E92 N54 2007 (kline)
ER Chargepipe + TIAL BOV with 1/4" tapped manifold , MMP IN & OUTlets, Chargepipe CM10 nozzle with 93% Ethanol(soon going pure meth) , JB4 MHD custom map 6, Shell Vpower 100 , D.P + straightpipes, 5" stepped wagner FMIC , 0.5 mm NGK 95770

öhlins shocks & springs , M3 swaybar front & other M3 bits, PCV lowside: Misimoto ccan Ext RB blocked ports, highside: BMS ccan , Solid Diff Brace, 20" wheels,Android HU,
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Default 03-02-2020, 11:05 AM

Have you verified how much you are spraying by measuring the amount into a bucket?
Is your BOV setup correctly and not leaking?
I still see crazy swings on bank 1 AFR mid run.


335i FBO,Meth,JB4,Sutphin flash,LSD,GCLites 11.25@127.4 on NT05R

335xi FBO,Meth,JB4,Sutphin flash,VTT stage1 11.38 1/4 - 7.30 1/8th - 3.35 0 to 60 @ 0C
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Default 03-02-2020, 01:10 PM

Quote:
Originally Posted by blown07
Have you verified how much you are spraying by measuring the amount into a bucket?
Is your BOV setup correctly and not leaking?
I still see crazy swings on bank 1 AFR mid run.
this is from a spray-in-bucket-test I did a while back:
Jesper Blumensaat on Instagram: “Final Nozzletest, good 2 go😎 BMS METH/H2O kit, cm10 - JB4 - 2,3 gallon trunkmount. #bmw #e92 #335i #burgertuning #n54 #n54gang #n54tech”

Im pretty sure my TIAL bov is setup right, but I will take it apart tomorrow and clean and put it back together.

only code I get is 2C7E from the rear O2 sensor not liking the ***


E92 N54 2007 (kline)
ER Chargepipe + TIAL BOV with 1/4" tapped manifold , MMP IN & OUTlets, Chargepipe CM10 nozzle with 93% Ethanol(soon going pure meth) , JB4 MHD custom map 6, Shell Vpower 100 , D.P + straightpipes, 5" stepped wagner FMIC , 0.5 mm NGK 95770

öhlins shocks & springs , M3 swaybar front & other M3 bits, PCV lowside: Misimoto ccan Ext RB blocked ports, highside: BMS ccan , Solid Diff Brace, 20" wheels,Android HU,
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Default 03-05-2020, 10:29 AM

Quote:
Originally Posted by Nordic335IM3

The spray looks like it goes wide appropriately - based on videos I've taken of mine after first receiving (was a narrow-long spray) and then tightening insert (wide-short spray).
This suggests the insert is screwed in and has bottomed out tight. (doesn't hurt to put a small slotted driver to it to verify)


Quote:
Originally Posted by blown07
I still see crazy swings on bank 1 AFR mid run.

I see it swing in the middle from 0 to 25 to 0, but that is when he lifts of the throttle.
Then it happens again when he shifts.
This should be acceptable - it just goes to 25 (default).


Looking at the difference in Trim between Banks, it is indicative of the Meth not entering each port in equal volume.
I had this and had to run dual CM5, opposing to correct this difference.

Following that, while in theory enough hunting followed by trial and error may bring this both up above 10 rather than a flat 0... I just went with Trebila and immediately my Trims were flawless and I had 5 PSI added to boot.

The WGDC top out at 73 under full load and 6000 RPM, building in a linear fashion.
If you were leaking, I'd expect them to tap out when at 6000 RPM, and also build exponentially between 2000 and 4000 RPM, but they are linear.


I did a quick re-read, and if I didn't miss something (happens often enough), I'd say, return to your beginning objective of fixing your Trims when running Meth.

You will either tune to correct, or be tunned to correct.
I'm sure BMS can get you there, but I'm not sure how fast with OTS.
Me? I grew tired of not seeing it happen after a number of weeks.
Trebila can get you there tomorrow with staggering results.




2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual CM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
RB: Inlets | PCV Valve
VRSF: DiPis | CP
HKS BOV
xHP Stage 3
NGK-97506 @ .020

Maintenance:
2018 - A/T Replaced | Ign Coils | Walnut Blast
2019 - Index 12 Injectors | VCG | OFHG & O-rings | TStat
2020 - OPG | Battery | IBS | Water Pump | Plugs | Alternator
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Memo Memo is offline
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Default 03-05-2020, 10:48 AM

Hi Terry, I'm in trouble, I hope you can help me buy a new methanol bms kit but I haven't been able to configure everything about methanol I hope you can help me I'll thank you
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Default 03-05-2020, 10:56 AM

Quote:
Originally Posted by Memo
Hi Terry, I'm in trouble, I hope you can help me buy a new methanol bms kit but I haven't been able to configure everything about methanol I hope you can help me I'll thank you

Respectfully, you are responding on a few other people's threads.

Best is to start your own for issue.

It's a great kit. Would be nice if you got a paper to all the common stickies on the subject in the box with it




2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual CM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
RB: Inlets | PCV Valve
VRSF: DiPis | CP
HKS BOV
xHP Stage 3
NGK-97506 @ .020

Maintenance:
2018 - A/T Replaced | Ign Coils | Walnut Blast
2019 - Index 12 Injectors | VCG | OFHG & O-rings | TStat
2020 - OPG | Battery | IBS | Water Pump | Plugs | Alternator
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Default 03-05-2020, 12:52 PM

Quote:
Originally Posted by codesx
The spray looks like it goes wide appropriately - based on videos I've taken of mine after first receiving (was a narrow-long spray) and then tightening insert (wide-short spray).
This suggests the insert is screwed in and has bottomed out tight. (doesn't hurt to put a small slotted driver to it to verify)

I see it swing in the middle from 0 to 25 to 0, but that is when he lifts of the throttle.
Then it happens again when he shifts.
This should be acceptable - it just goes to 25 (default).

You will either tune to correct, or be tunned to correct.
I'm sure BMS can get you there, but I'm not sure how fast with OTS.
Me? I grew tired of not seeing it happen after a number of weeks.
Trebila can get you there tomorrow with staggering results.
My comment was more related to the actual AFR on bank 1 not the trims as I have never seen an AFR change like that mid gear. Perhaps related to bad O2 after the *** that he has (should be used for AFR trimming only but?)


335i FBO,Meth,JB4,Sutphin flash,LSD,GCLites 11.25@127.4 on NT05R

335xi FBO,Meth,JB4,Sutphin flash,VTT stage1 11.38 1/4 - 7.30 1/8th - 3.35 0 to 60 @ 0C
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Default 03-05-2020, 02:38 PM

Quote:
Originally Posted by blown07
My comment was more related to the actual AFR on bank 1 not the trims as I have never seen an AFR change like that mid gear. Perhaps related to bad O2 after the *** that he has (should be used for AFR trimming only but?)

Thanks blown07.
That was my misread... ARF turned into Trims in my head.

I see what you mention, it's brief, around 3600 to 3800 RPM.
The Meth kicks in at 2600 RPM, 14 PSI.
Bank 2 takes a dip at 3300 RPM, Bank 1 dips at 3700 RPM, approx .5 to .7 seconds after Meth flow.
I looked at the other logs (map 3 and 2) and don't identify the same.

If a few Map 3, 3rd gear, full RPM runs do show the AFR dip, I suggest you move the Meth spray RPM to 3500 or 4000 RPM and/or 16.5 PSI for a test. Does the ARF dip continue to occur .75 seconds after Meth spray starts?

The Trims and AFR are good in Map 2.
IMO, you are on the hunt for optimal Meth spray and tuning.




2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual CM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
RB: Inlets | PCV Valve
VRSF: DiPis | CP
HKS BOV
xHP Stage 3
NGK-97506 @ .020

Maintenance:
2018 - A/T Replaced | Ign Coils | Walnut Blast
2019 - Index 12 Injectors | VCG | OFHG & O-rings | TStat
2020 - OPG | Battery | IBS | Water Pump | Plugs | Alternator
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Default 03-07-2020, 03:16 AM

[QUOTE=codesx;659415]Thanks blown07.

I suggest you move the Meth spray RPM to 3500 or 4000 RPM

thx, I will try this and report back

Are you pushing 24 psi on the OEM snails?


E92 N54 2007 (kline)
ER Chargepipe + TIAL BOV with 1/4" tapped manifold , MMP IN & OUTlets, Chargepipe CM10 nozzle with 93% Ethanol(soon going pure meth) , JB4 MHD custom map 6, Shell Vpower 100 , D.P + straightpipes, 5" stepped wagner FMIC , 0.5 mm NGK 95770

öhlins shocks & springs , M3 swaybar front & other M3 bits, PCV lowside: Misimoto ccan Ext RB blocked ports, highside: BMS ccan , Solid Diff Brace, 20" wheels,Android HU,
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Default 03-07-2020, 07:21 AM

[QUOTE=Nordic335IM3;659517]
Quote:
Originally Posted by codesx
Thanks blown07.

I suggest you move the Meth spray RPM to 3500 or 4000 RPM

thx, I will try this and report back

Are you pushing 24 psi on the OEM snails?

Still stock. 24 PSI by 3000 RPM.
No doubt they can't hold this past 4500 RPM, but it still holds well up top in a relative sense.

I recognize this isn't treating them with any respect, but it is seriously fun and I have my next set of twins picked out. This winter I've become familiar with this area of my car, so when these go I'll do the work myself.


As far as adjusting when meth starts, that's is to help hunt down the observed AFR dip.
I only saw that in 1 log, but most logs posted here differed too much for consistency testing.

Personally, I'd focus on the meth atomization and distribution and Trims which camp at 0.




2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual CM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
RB: Inlets | PCV Valve
VRSF: DiPis | CP
HKS BOV
xHP Stage 3
NGK-97506 @ .020

Maintenance:
2018 - A/T Replaced | Ign Coils | Walnut Blast
2019 - Index 12 Injectors | VCG | OFHG & O-rings | TStat
2020 - OPG | Battery | IBS | Water Pump | Plugs | Alternator
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Default 03-07-2020, 07:45 AM

You need to actually measure how much meth you are spraying. Run the meth into a bucket using menu 5/7 for 30sec and multiply by the amount by 2 to get the ml/min. I run about 800ml/min but I drilled and tapped the outlet tank of the VRSF intercoolers and spray there which really improved the distribution of the meth and brought the trims closer together.


335i FBO,Meth,JB4,Sutphin flash,LSD,GCLites 11.25@127.4 on NT05R

335xi FBO,Meth,JB4,Sutphin flash,VTT stage1 11.38 1/4 - 7.30 1/8th - 3.35 0 to 60 @ 0C
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Default 03-07-2020, 10:02 AM

Quote:
Originally Posted by blown07
You need to actually measure how much meth you are spraying. Run the meth into a bucket using menu 5/7 for 30sec and multiply by the amount by 2 to get the ml/min. I run about 800ml/min but I drilled and tapped the outlet tank of the VRSF intercoolers and spray there which really improved the distribution of the meth and brought the trims closer together.

Nice work injecting into the FMIC.
If I stuck with OTS BEF, I may have done that to see if it helped with trims equality.
Got any pics of your setup?

Good idea on measuring as well, for certainty.

Here are my before and after videos of my meth spray.
(I used water for the test)
The first video shows a long range spray... picture that just hammering the other side of the CP as a stream...
Second is after I tightened my insert, which I had to do on multiple of my nozzles.

Shared album - David H - Google Photos




2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual CM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
RB: Inlets | PCV Valve
VRSF: DiPis | CP
HKS BOV
xHP Stage 3
NGK-97506 @ .020

Maintenance:
2018 - A/T Replaced | Ign Coils | Walnut Blast
2019 - Index 12 Injectors | VCG | OFHG & O-rings | TStat
2020 - OPG | Battery | IBS | Water Pump | Plugs | Alternator
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Nordic335IM3 Nordic335IM3 is offline
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Default 03-08-2020, 07:58 AM

Quote:
Originally Posted by blown07
You need to actually measure how much meth you are spraying. Run the meth into a bucket using menu 5/7 for 30sec and multiply by the amount by 2 to get the ml/min. I run about 800ml/min but I drilled and tapped the outlet tank of the VRSF intercoolers and spray there which really improved the distribution of the meth and brought the trims closer together.
what should I do with the measured ml/min value?..

Im running the BMS2.2 gallon/CM pump(200psi) setup with a single CM10 nozzle (940cc @100psi) in a single bung ER chargepipe.

Car pulls really well now, but Im not sure about the weird timing drops? ..dont want to mess things up engine wise..dont mind pushing the turbos to the max

is it because the fuel isn´t up to par for the race flash? ..
would it change anything if I change the BioEthanol / water mix to pure Meth?.. (bioethanol 90%+ is only available in 2,5 quarts jugs, dont have any E85)
also thinking about adding another bung and go dual CM5 ..
thx for all the help guys
Attached Files
File Type: csv 20200309_2300_runs(2).csv (32.7 KB, 165 views)


E92 N54 2007 (kline)
ER Chargepipe + TIAL BOV with 1/4" tapped manifold , MMP IN & OUTlets, Chargepipe CM10 nozzle with 93% Ethanol(soon going pure meth) , JB4 MHD custom map 6, Shell Vpower 100 , D.P + straightpipes, 5" stepped wagner FMIC , 0.5 mm NGK 95770

öhlins shocks & springs , M3 swaybar front & other M3 bits, PCV lowside: Misimoto ccan Ext RB blocked ports, highside: BMS ccan , Solid Diff Brace, 20" wheels,Android HU,

Last edited by Nordic335IM3; 03-10-2020 at 02:33 AM..
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Default 03-13-2020, 05:08 AM

I once bought a cm10 from BMS and the actual output of it was equivalent to CM14 so you need to check it. You are either spraying too much meth (first point is you should be using methanol imo) or you have a bad O2 sensor. Have you double checked to make sure your primary O2 sensors are not switched? Your AFR1 reading is too low and AFR2 is too high mid rpm in my opinion. If you are getting a secondary o2 fault I would change that sensor and start from there. Your first bank of cylinders are getting way more fueling than your secondary bank from what i see. Can you see the separation in AFR's? Look at other peoples logs to compare.


335i FBO,Meth,JB4,Sutphin flash,LSD,GCLites 11.25@127.4 on NT05R

335xi FBO,Meth,JB4,Sutphin flash,VTT stage1 11.38 1/4 - 7.30 1/8th - 3.35 0 to 60 @ 0C
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Default 03-13-2020, 02:19 PM

Quote:
Originally Posted by blown07
I once bought a cm10 from BMS and the actual output of it was equivalent to CM14 so you need to check it. You are either spraying too much meth (first point is you should be using methanol imo) or you have a bad O2 sensor. Have you double checked to make sure your primary O2 sensors are not switched? Your AFR1 reading is too low and AFR2 is too high mid rpm in my opinion. If you are getting a secondary o2 fault I would change that sensor and start from there. Your first bank of cylinders are getting way more fueling than your secondary bank from what i see. Can you see the separation in AFR's? Look at other peoples logs to compare.
Okay, Im will try measuring the ml/minut, and get hold of real Meth.
Im sure the O2 sensors are in the right place, but I could check the voltage with carly and replace that rear one which throws a code now and then.
I have included a Map 5 log with no spray , does it look like its the spray action which causes trouble?..afr 1 & 2 looks fine to me here..
Attached Files
File Type: csv 20200313_143854_runs(1).csv (22.0 KB, 164 views)


E92 N54 2007 (kline)
ER Chargepipe + TIAL BOV with 1/4" tapped manifold , MMP IN & OUTlets, Chargepipe CM10 nozzle with 93% Ethanol(soon going pure meth) , JB4 MHD custom map 6, Shell Vpower 100 , D.P + straightpipes, 5" stepped wagner FMIC , 0.5 mm NGK 95770

öhlins shocks & springs , M3 swaybar front & other M3 bits, PCV lowside: Misimoto ccan Ext RB blocked ports, highside: BMS ccan , Solid Diff Brace, 20" wheels,Android HU,
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Nordic335IM3 Nordic335IM3 is offline
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Car: BMW 335I N54
Default back at it :) - 06-25-2020, 02:23 PM

two map 7 logs

how does these look apart from the trim drops?


everything is running well..

(bank 1 rear O2 is only thing that needs replacing)
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E92 N54 2007 (kline)
ER Chargepipe + TIAL BOV with 1/4" tapped manifold , MMP IN & OUTlets, Chargepipe CM10 nozzle with 93% Ethanol(soon going pure meth) , JB4 MHD custom map 6, Shell Vpower 100 , D.P + straightpipes, 5" stepped wagner FMIC , 0.5 mm NGK 95770

öhlins shocks & springs , M3 swaybar front & other M3 bits, PCV lowside: Misimoto ccan Ext RB blocked ports, highside: BMS ccan , Solid Diff Brace, 20" wheels,Android HU,
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florida2002m3 florida2002m3 is offline
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Car: E60 535i
Default 06-30-2021, 07:04 PM

Any luck solving this?


2010 535i, 6mt, 80k miles, BMS DCI, JB4 G5, BMS WMI (CM10, 50/50), VRSF Inlets, VRSF **, ETS 5" FMIC, VRSF CP/HKS BOV, Walbro 450, custom BEF (treb), E40.

2011 535i, 6mt, 1000k miles, BMS intake, 7" FMIC, MHD E30 Stage 2+, VRSF **, muffler delete.
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alaodudonyl alaodudonyl is offline
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Default 07-01-2021, 10:43 AM

I have a similar problem where my trims with Meth (800mi/min) will truly bottom out ie will go below zero depending on temp outside.

My understanding is that as long as you are above 0 (-25 trim) then the ECU is still able to compensate by pulling enough fuel.

To me the OP's trims look fine and this is a very conservative boost adder with meth and with that timing.

Steve - I have typically changed my fuel scalars in the BMS race flash from 1.10 to as low as 1.00 to compensate for this but I'm not sure this is the best approach as all cylinders are less happy.

I have considered in the past lowering the FOL below 40 (it never moves from 40 unless it's crazy cold out and will go to 41).

When you go below 40 is it true that this removes the ability of the ECU to bias the fuel pressure up/down?

I may try taking my FOL down to 20 but I'm confused about the drawback of this.
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Nordic335IM3 Nordic335IM3 is offline
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Default 07-01-2021, 11:19 AM

https://***********/u/mrblondedk/log...data=1-4-14-35

datazap . me

this is a fairly new log, trims look better.

I reseated my nozzle it was not optimal, now its atomizing as it should.

be sure the spray is set right, also walnut blast intake valves if needed.

btw this is a trebila custom tune on oem rebuild turbos.


E92 N54 2007 (kline)
ER Chargepipe + TIAL BOV with 1/4" tapped manifold , MMP IN & OUTlets, Chargepipe CM10 nozzle with 93% Ethanol(soon going pure meth) , JB4 MHD custom map 6, Shell Vpower 100 , D.P + straightpipes, 5" stepped wagner FMIC , 0.5 mm NGK 95770

öhlins shocks & springs , M3 swaybar front & other M3 bits, PCV lowside: Misimoto ccan Ext RB blocked ports, highside: BMS ccan , Solid Diff Brace, 20" wheels,Android HU,

Last edited by Nordic335IM3; 07-01-2021 at 11:32 AM.. Reason: forgot info
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