Hey all,
I've been troubleshooting this issue for a while and have come to a point where I need to consult the N54 masters here. So I have this issue where around 18+ PSI of boost (or max load for my current tune) my Ethanol Sensor CAN % reading spikes to 38%. It is screwing with my ability to get a Flex Fuel tune, as the tune adjusts based on this value. I have only been running Pump 93 throughout all my testing. At the time of the gathered log, I was at around a quarter tank of 93 (although previous tests were done on a dyno with fuel levels at >half tank)
(Relevant?) Modifications:
In my troubleshooting, I've attempted:
06/27/24 EDIT w/ Resolution:
So after updating my Reflex+ with the latest firmware (went from v44 to v6.35) and tuning files (v6.2 XDF and v6.2 ADX), the ethanol fluctuations at WOT have been greatly reduced. In the Reflex+ Firmware Changelog there's a mention of 'ethanol sensitivity' updates, so I assume this was the specific code fix that fixed the issue. I now fluctuate 1-2% at WOT instead of 30+%. I kept all the wire routing as shown in my above images.
I've been troubleshooting this issue for a while and have come to a point where I need to consult the N54 masters here. So I have this issue where around 18+ PSI of boost (or max load for my current tune) my Ethanol Sensor CAN % reading spikes to 38%. It is screwing with my ability to get a Flex Fuel tune, as the tune adjusts based on this value. I have only been running Pump 93 throughout all my testing. At the time of the gathered log, I was at around a quarter tank of 93 (although previous tests were done on a dyno with fuel levels at >half tank)
(Relevant?) Modifications:
- Doc Race DR700 Bottom Mount Turbo with Precision 6266 Gen2 BB turbo (Recirc. Wastegate)
- Turbosmart GenV Hypergate45 wastegate with 19psi spring
- BMP Forward Facing Manifold with 750CC Bosch injectors, aluminum CP w/ tial BOV
- Walbro 450 bucketless pump
- Precision Raceworks Forward Facing Manifold with Port Injection (750cc injectors) (0-10 bar Motiv Pressure connected onto PI Fuel Rail Aux In 2)
- Motiv ReFlex Plus w/ Aux Port 1 connected to 3-port MAC Sol
- Nexsys Motorsport B58 Ignition Coil Upgrade w/ NGK-94201 plugs
- VSRF 7.5" Stepped Race Intercooler
- Continental Ethanol Sensor connected via ReFlex
- O2 Sensors connected for Single Bank Fueling
- 3.5bar TMAP
In my troubleshooting, I've attempted:
- changing the ground on the Reflex to a few different locations in engine bay, final resting spot shown in attached photo
-
- changing the +12V input to different ECU connection
- routing the Ethanol sensor wire behind the windshield cowl AWAY from the B58 coils (possible RF noise affecting line?)
- replacing all relays with diode-blocked relays for Precision fuel pump (and underglow and LED headlights --although I ended up just pulling the fuse for those as to take them out of the loop completely)
- replaced the Continental Ethanol Sensor with a new one
- cleaned connection between Sensor and Cable
06/27/24 EDIT w/ Resolution:
So after updating my Reflex+ with the latest firmware (went from v44 to v6.35) and tuning files (v6.2 XDF and v6.2 ADX), the ethanol fluctuations at WOT have been greatly reduced. In the Reflex+ Firmware Changelog there's a mention of 'ethanol sensitivity' updates, so I assume this was the specific code fix that fixed the issue. I now fluctuate 1-2% at WOT instead of 30+%. I kept all the wire routing as shown in my above images.
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