Issues with tuning Pure Stage 2 N55

Ethan Skinner · 05-11-2022, 08:50 PM

Good evening everyone. I installed my pure stage 2 turbo on my 2013 335i E92 about a month ago. I have been going back and forth with my tuner with logs and I have not resolved a misfire issue that is happening. It pulls really great once the turbo spools up but once it climbs to about 4k or 5k rpms it starts misfiring real bad and goes into limp mode.
I have replaced all spark plugs and gapped them to .02
I have replaced all ignition coils.
still misfiring
here are some logs from tonight

https://datazap.me/u/ethan-skinner/n...=0&data=2-3-15

https://datazap.me/u/ethan-skinner/p...og=0&data=3-15

E92only · 05-12-2022, 12:07 PM

Have you upgraded your HPFP? Could be a need for more fuel delivery

Ethan Skinner · 05-12-2022, 06:16 PM

Quote:

Originally Posted by E92only

Have you upgraded your HPFP? Could be a need for more fuel delivery

Yeah I have a dorch HPFP. Rail pressure looks solid

E92only · 05-12-2022, 06:27 PM

I'd increase the gap to .022 or 0.24. Also depending on your boost you may need a 3.5 BAR TMAP sensor if you don't have one already.

Ethan Skinner · 05-12-2022, 07:10 PM

Quote:

Originally Posted by E92only

I'd increase the gap to .022 or 0.24. Also depending on your boost you may need a 3.5 BAR TMAP sensor if you don't have one already.

My boost target is around 22psi. Should I get the 3.5 BAR sensor?

I had the original plugs in that were gapped at .03 and the misfire feels the exact same after I put new plugs in gapped at .02 so I dont think that is causing the issue.

E92only · 05-12-2022, 07:14 PM

Boost caps off at 20 psi on the stock 2.5 bar sensor. You should upgrade to the 3.5 bar for sure. Seems like the cheapest way to try to fix your issue.

Ethan Skinner · 05-12-2022, 07:18 PM

Quote:

Originally Posted by E92only

Boost caps off at 20 psi on the stock 2.5 bar sensor. You should upgrade to the 3.5 bar for sure. Seems like the cheapest way to try to fix your issue.

Okay great my dad drives a N20 428i so im gonna go steal his real quick and see if that works

E92only · 05-12-2022, 07:26 PM

Quote:

Originally Posted by Ethan Skinner

Quote:

Originally Posted by E92only

Boost caps off at 20 psi on the stock 2.5 bar sensor. You should upgrade to the 3.5 bar for sure. Seems like the cheapest way to try to fix your issue.

Okay great my dad drives a N20 428i so im gonna go steal his real quick and see if that works

That's what dads are there for. Make sure you reflash your tune and check the 3.5 N20 box. Please update!

flapeo · 05-15-2022, 07:28 PM

At around 5k rpm with 100% throttle you can see the AFR quickly jump from 12.5ish to 15-1, that's pretty lean and probably why you're misfiring.

Ethan Skinner · 05-16-2022, 04:00 PM

Quote:

Originally Posted by E92only

That's what dads are there for. Make sure you reflash your tune and check the 3.5 N20 box. Please update!

Took it for a spin with the 3.5 bar sensor and a reflash and it felt the same. Misfiring at high RPMS

Ethan Skinner · 05-16-2022, 04:03 PM

Quote:

Originally Posted by flapeo

At around 5k rpm with 100% throttle you can see the AFR quickly jump from 12.5ish to 15-1, that's pretty lean and probably why you're misfiring.

I didn't notice that until now. My rail pressure drops from 2500 to 2200 when the AFRs start going lean. Am I not flowing enough fuel? I have a dorch stage 1 hpfp.

jlegelis · 05-16-2022, 09:03 PM

Fuel pressure looks fine... I know what a rail pressure crash looks like and you don't have one, especially with the Dorch.

Noticing ton's of big timing corrections (-11 wtf?) - you need to fix that. Basically too much boost and too little octane. Your tuner is being *way* too aggressive if you are running stock fuel (93) - you cannot run these cars at those boost levels without add'l fueling (ethanol or methanol). This is not rocket science.. PS2 N55's are solid and well understood.

Here's my daily driver PS2 93 Octane map which tapers to 14 PSI at 6500k. Occasionally I'll throw some E85 in to sweeten it and those minor corrections go away. Tell your tuner to dial it back, or you need to invest in additional fueling or you will damage something. Seriously, if the car goes in to limp mode it's telling you something. Or get another tuner.

jlegelis · 05-19-2022, 09:44 AM

Ethan Skinner any updates?

ferocity02 · 05-21-2022, 10:12 AM

Are you a DCT? Could be the infamous ghost misfire.

E92only · 05-21-2022, 09:40 PM

Quote:

Originally Posted by ferocity02

Are you a DCT? Could be the infamous ghost misfire.

sounds spooky

Ozzie335i · 05-26-2022, 08:32 AM

Quote:

Originally Posted by E92only

sounds spooky

Not as crazy as it may sound. Above 500 whp, which the Pure 2 easily does, can cause vibrations in the dual mass torque converter, thus end up with timing errors / misfires.

jlegelis · 05-29-2022, 08:54 PM

Really wish the poster would respond. IMHO the tune is not right - can't run that kind of boost on stock fueling. Twisted Tuning

05-11-2022, 08:50 PM	#1
Ethan Skinner Private 17 Rep 52 Posts Drives: 2013 E92 335i Join Date: Jan 2019 Location: Santa Rosa Beach, Florida iTrader: (0)	Issues with tuning Pure Stage 2 N55 Good evening everyone. I installed my pure stage 2 turbo on my 2013 335i E92 about a month ago. I have been going back and forth with my tuner with logs and I have not resolved a misfire issue that is happening. It pulls really great once the turbo spools up but once it climbs to about 4k or 5k rpms it starts misfiring real bad and goes into limp mode. I have replaced all spark plugs and gapped them to .02 I have replaced all ignition coils. still misfiring here are some logs from tonight https://datazap.me/u/ethan-skinner/n...=0&data=2-3-15 https://datazap.me/u/ethan-skinner/p...og=0&data=3-15
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05-12-2022, 12:07 PM	#2
E92only Second Lieutenant 82 Rep 227 Posts Drives: 2011 E92 335i 6MT M-Sport Join Date: Nov 2013 Location: Glendale, CA iTrader: (0)	Have you upgraded your HPFP? Could be a need for more fuel delivery __________________ 2011 E92 335i 6MT \| MHD \| AA FMIC \| AR Design DP \| ER CP \| PE \| AutoSolutions SSK \| SouthBend Stg3 \| MFactory SMFW \| Bilstein B14 \| M3 Arms \| -2.75° camber \| 2020 Porsche Macan S PASM
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05-12-2022, 06:27 PM	#4
E92only Second Lieutenant 82 Rep 227 Posts Drives: 2011 E92 335i 6MT M-Sport Join Date: Nov 2013 Location: Glendale, CA iTrader: (0)	I'd increase the gap to .022 or 0.24. Also depending on your boost you may need a 3.5 BAR TMAP sensor if you don't have one already. __________________ 2011 E92 335i 6MT \| MHD \| AA FMIC \| AR Design DP \| ER CP \| PE \| AutoSolutions SSK \| SouthBend Stg3 \| MFactory SMFW \| Bilstein B14 \| M3 Arms \| -2.75° camber \| 2020 Porsche Macan S PASM
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05-12-2022, 07:14 PM	#6
E92only Second Lieutenant 82 Rep 227 Posts Drives: 2011 E92 335i 6MT M-Sport Join Date: Nov 2013 Location: Glendale, CA iTrader: (0)	Boost caps off at 20 psi on the stock 2.5 bar sensor. You should upgrade to the 3.5 bar for sure. Seems like the cheapest way to try to fix your issue. __________________ 2011 E92 335i 6MT \| MHD \| AA FMIC \| AR Design DP \| ER CP \| PE \| AutoSolutions SSK \| SouthBend Stg3 \| MFactory SMFW \| Bilstein B14 \| M3 Arms \| -2.75° camber \| 2020 Porsche Macan S PASM
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05-15-2022, 07:28 PM	#9
flapeo Private 17 Rep 76 Posts Drives: 2011 335i x drive Join Date: Dec 2021 Location: seattle wa iTrader: (0)	At around 5k rpm with 100% throttle you can see the AFR quickly jump from 12.5ish to 15-1, that's pretty lean and probably why you're misfiring.
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05-16-2022, 09:03 PM	#12
jlegelis Private First Class 33 Rep 129 Posts Drives: 2013 E92 N55 MT MSport Join Date: Jan 2013 Location: Boston, MA iTrader: (0)	Fuel pressure looks fine... I know what a rail pressure crash looks like and you don't have one, especially with the Dorch. Noticing ton's of big timing corrections (-11 wtf?) - you need to fix that. Basically too much boost and too little octane. Your tuner is being way too aggressive if you are running stock fuel (93) - you cannot run these cars at those boost levels without add'l fueling (ethanol or methanol). This is not rocket science.. PS2 N55's are solid and well understood. Here's my daily driver PS2 93 Octane map which tapers to 14 PSI at 6500k. Occasionally I'll throw some E85 in to sweeten it and those minor corrections go away. Tell your tuner to dial it back, or you need to invest in additional fueling or you will damage something. Seriously, if the car goes in to limp mode it's telling you something. Or get another tuner. Last edited by jlegelis; 05-16-2022 at 10:12 PM..
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05-19-2022, 09:44 AM	#13
jlegelis Private First Class 33 Rep 129 Posts Drives: 2013 E92 N55 MT MSport Join Date: Jan 2013 Location: Boston, MA iTrader: (0)	Ethan Skinner any updates?
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05-21-2022, 10:12 AM	#14
ferocity02 Colonel 530 Rep 2,083 Posts Drives: 2013 135is Join Date: May 2014 Location: USA iTrader: (8)	Are you a DCT? Could be the infamous ghost misfire.
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05-29-2022, 08:54 PM	#17
jlegelis Private First Class 33 Rep 129 Posts Drives: 2013 E92 N55 MT MSport Join Date: Jan 2013 Location: Boston, MA iTrader: (0)	Really wish the poster would respond. IMHO the tune is not right - can't run that kind of boost on stock fueling. Twisted Tuning
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