100 Octane and Lots of Timing Correction

boosted-lt1 · 11-05-2019, 03:38 PM

I was previously seeing some timing corrections on 93 pump fuel and have backed off on the tune (was MHD S2+93 OCT)

I figured I would try some Sunoco 260GT 100 octane unleaded just to see

This log is with the MHD S2+95 OCT tune.

I was not expecting to see up to 12 degrees of knock retard!

I'm planning on 1 step colder plugs and a VRSF intercooler

What do you guys think?

https://datazap.me/u/boostedlt1/log-...36-37-38-39-40

Supermoon · 11-05-2019, 04:34 PM

Did you reset adaptations?

Turbod · 11-05-2019, 05:42 PM

Quote:

Originally Posted by boosted-lt1

I was previously seeing some timing corrections on 93 pump fuel and have backed off on the tune (was MHD S2+93 OCT)

I figured I would try some Sunoco 260GT 100 octane unleaded just to see

This log is with the MHD S2+95 OCT tune.

I was not expecting to see up to 12 degrees of knock retard!

I'm planning on 1 step colder plugs and a VRSF intercooler

What do you guys think?

https://datazap.me/u/boostedlt1/log-...36-37-38-39-40

Temps weren't high enough yet to pull timing. I personally didn't have good results running the 260gt. How much 93 was in the tank when you added the 100 and how much 100 did you add?

iqraceworks · 11-05-2019, 06:43 PM

I always thought that most of the race fuel (high in lead) will destroy your cats and O2 sensors.....is that not the case with the Sunco?

IllSic_Design · 11-05-2019, 06:53 PM

Quote:

Originally Posted by iqraceworks

I always thought that most of the race fuel (high in lead) will destroy your cats and O2 sensors.....is that not the case with the Sunco?

The gas he tried is unleaded according to his post

iqraceworks · 11-05-2019, 06:55 PM

Quote:

Originally Posted by IllSic_Design

The gas he tried is unleaded according to his post

Ahh....I see that now. Missed it the first time.

weehe126 · 11-05-2019, 11:26 PM

I'm going to second resetting adaptations. Your trims are max negative. Seeing as your starting IAT was ~66 I'm guessing it is probably 50-55 out when you did this? Do you have traction control fully off? How old are your plugs and coils

boosted-lt1 · 11-06-2019, 10:34 AM

Thanks for the responses

I had about 30 miles until empty and then added 7 gallons of the 100 octane

I did not reset any adaptations. Should I go ahead and reset them all, or just certain ones when changing fuels?

Ambient temperature was about 50F and this was the first pull. IAT rises pretty fast with this BMS intercooler, but like you said, the overall temps didn't get too high during this single run

Traction control and DSC were completely off

Spark Plugs and Coils are unknown. yeah... pretty basic at least on the plugs. I should know better
* I'm getting some NGK 97506 ordered before I mess around any further
* Regarding coils - what is recommended here? I'm not getting any misfire codes. Is it a good idea to replace these anyways at certain intervals? Also considering that plug/coil history was not included in the maintenance history with the car. Is there a way to validate the coils are OK?

When you say trims are max negative, can you explain what you are seeing? Would that be STFT? I'm not clear on what I should be looking at here.

Thanks!

weehe126 · 11-06-2019, 11:34 AM

Yes STFT is the fuel trims, negative meaning it is pulling fuel. Start with the plugs, if they don't fix it get Delphi stock replacement coils.

jlegelis · 11-06-2019, 12:31 PM

>> if they don't fix it get Delphi stock replacement coils.

weehe126 curious about that statement. At what age / mileage do coils need replacing? Any other symptoms, or do they just get weak?

weehe126 · 11-06-2019, 01:30 PM

Just car to car on when coils need to be replaced. I replaced mine at 80k miles but didn't have any issues with them. Then one of the replacements only lasted 5k.

Supermoon · 11-06-2019, 02:21 PM

Quote:

Originally Posted by boosted-lt1

I did not reset any adaptations. Should I go ahead and reset them all, or just certain ones when changing fuels?

When I do, I reset everything except throttle and battery.

boosted-lt1 · 11-06-2019, 03:52 PM

Quote:

Originally Posted by Supermoon

When I do, I reset everything except throttle and battery.

Ok, I reset adaptations and still seeing about the same thing. I will back the tune off again until I can change plugs. Thanks

https://datazap.me/u/boostedlt1/log-...36-37-38-39-40

11-05-2019, 03:38 PM	#1
boosted-lt1 New Member 9 Rep 16 Posts Drives: 2011 BMW 335i Join Date: Oct 2019 Location: Michigan iTrader: (0)	100 Octane and Lots of Timing Correction I was previously seeing some timing corrections on 93 pump fuel and have backed off on the tune (was MHD S2+93 OCT) I figured I would try some Sunoco 260GT 100 octane unleaded just to see This log is with the MHD S2+95 OCT tune. I was not expecting to see up to 12 degrees of knock retard! I'm planning on 1 step colder plugs and a VRSF intercooler What do you guys think? https://datazap.me/u/boostedlt1/log-...36-37-38-39-40 __________________ 2011 BMW E92 335i xDrive / M-Sport / 6-Speed - AFE DP / VRSF Intercooler / CP / NGK 97506 - Stage 2 Clutch / Mid-Cat Delete / PE Mod Exhaust - MHD S2+ / E30 / Water-Meth Inj.
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11-05-2019, 04:34 PM	#2
Supermoon Lieutenant 166 Rep 429 Posts Drives: 2011 e92 335xi Join Date: Aug 2015 Location: Seoul iTrader: (6) Garage List 2011 BMW 335i xDriv ... [10.00]	Did you reset adaptations? __________________ 2011 E92 335i xDrive Pure Stage 1 \| DV+ & Inlet \| Injen Intake \| M3 Cowl \| ETS 5" FMIC & CP \| Aquamist HFS4 Direct Port \| CSF Radiator \| Wagner Catted DP \| BMW PE \| Apex FL-5 \| Michelin PS4S \| 335is Engine mount \| SDW Monoball thrust arms \| UUC Swaybars & SS Brake lines \| Bilstein B8 \| Dinan Springs & Shock mounts \| Whiteline RSFB \| M3 Rear Control arms \| Manzo Toe arms \| Wavetrac LSD
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11-05-2019, 06:43 PM	#4
iqraceworks Brigadier General 2096 Rep 3,811 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	I always thought that most of the race fuel (high in lead) will destroy your cats and O2 sensors.....is that not the case with the Sunco?
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11-05-2019, 11:26 PM	#7
weehe126 Brigadier General 1189 Rep 3,228 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	I'm going to second resetting adaptations. Your trims are max negative. Seeing as your starting IAT was ~66 I'm guessing it is probably 50-55 out when you did this? Do you have traction control fully off? How old are your plugs and coils
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11-06-2019, 10:34 AM	#8
boosted-lt1 New Member 9 Rep 16 Posts Drives: 2011 BMW 335i Join Date: Oct 2019 Location: Michigan iTrader: (0)	Thanks for the responses I had about 30 miles until empty and then added 7 gallons of the 100 octane I did not reset any adaptations. Should I go ahead and reset them all, or just certain ones when changing fuels? Ambient temperature was about 50F and this was the first pull. IAT rises pretty fast with this BMS intercooler, but like you said, the overall temps didn't get too high during this single run Traction control and DSC were completely off Spark Plugs and Coils are unknown. yeah... pretty basic at least on the plugs. I should know better * I'm getting some NGK 97506 ordered before I mess around any further * Regarding coils - what is recommended here? I'm not getting any misfire codes. Is it a good idea to replace these anyways at certain intervals? Also considering that plug/coil history was not included in the maintenance history with the car. Is there a way to validate the coils are OK? When you say trims are max negative, can you explain what you are seeing? Would that be STFT? I'm not clear on what I should be looking at here. Thanks! __________________ 2011 BMW E92 335i xDrive / M-Sport / 6-Speed - AFE DP / VRSF Intercooler / CP / NGK 97506 - Stage 2 Clutch / Mid-Cat Delete / PE Mod Exhaust - MHD S2+ / E30 / Water-Meth Inj.
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11-06-2019, 11:34 AM	#9
weehe126 Brigadier General 1189 Rep 3,228 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Yes STFT is the fuel trims, negative meaning it is pulling fuel. Start with the plugs, if they don't fix it get Delphi stock replacement coils.
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11-06-2019, 12:31 PM	#10
jlegelis Private First Class 33 Rep 129 Posts Drives: 2013 E92 N55 MT MSport Join Date: Jan 2013 Location: Boston, MA iTrader: (0)	>> if they don't fix it get Delphi stock replacement coils. weehe126 curious about that statement. At what age / mileage do coils need replacing? Any other symptoms, or do they just get weak?
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11-06-2019, 01:30 PM	#11
weehe126 Brigadier General 1189 Rep 3,228 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Just car to car on when coils need to be replaced. I replaced mine at 80k miles but didn't have any issues with them. Then one of the replacements only lasted 5k.
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