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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Questions regarding 101 octane and Flex Fuel Wires



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      06-17-2014, 02:11 PM   #1
SRT14PimPin07
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Questions regarding 101 octane and Flex Fuel Wires

Hey guys, need a little help/advice from the more knowledgeable people on here.
I'm running Jb4 ISO, catless DP, BMS intake and BMS CP, 91 octane. I found 101 octane around where I live, E85 is too far away. I've only been running map 1 the past 2 years my car has been tuned "91 octane". It's my daily driver, but I do like doing some occasional canyoning and spirited driving. I never track my car. So here are my questions.

1) How many gallons of 101 should I mix with 91 to be safe? I'm not trying to push the cars limits, just trying to add a little hp and try map 2 and map 5.

2) Do I need the Flex Fuel wires if I only plan to use the 101 octane maybe 5 times maximum a year. Planning on only using it when I go to canyon runs which are very rare. Maybe not even 5 times a year, probably less.

3) If I do need the Flex Fuel wires, can they be removed for dealer visits? Cuz in the instructions I see this one part where it says once you plug a certain wire into one of the ECU connectors, it cannot be removed unless you have a special tool. How do you guys go around that? You buy the tool to remove the wire?

4) Any other advice/info regarding what I'm discussing would be a great help!

Thanks in advance
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      06-17-2014, 02:26 PM   #2
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I've never used 101oct - so I cannot speak to that - but the FF wires are pretty easy to install and uninstall.

I believe that the part that the instructions are referring to, is the pin that goes into your JB4 connector. It's an additional pin. Since it's in the JB4, there's really no need to ever remove it.
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      06-17-2014, 05:28 PM   #3
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FF wires are only needed for E85 because of the density difference. They are not needed for gasoline, even higher octane gas. You can easily figure out the difference in octane. If you want to max out map 5 then you should add at least 6 gallons to a full tank. That should put you at 95 octane.
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      06-17-2014, 06:54 PM   #4
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Quote:
Originally Posted by JETmn View Post
FF wires are only needed for E85 because of the density difference. They are not needed for gasoline, even higher octane gas. You can easily figure out the difference in octane. If you want to max out map 5 then you should add at least 6 gallons to a full tank. That should put you at 95 octane.
Ohh I did not know that, thanks for the info.
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      06-17-2014, 09:32 PM   #5
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The FF wires are suggested/required for any higher boost level map including map 7. Not just for E85 use.

Mike
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      06-17-2014, 10:13 PM   #6
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
The FF wires are suggested/required for any higher boost level map including map 7. Not just for E85 use.

Mike
I won't be running map 7.....but if I put like 4 gallons of 101 and the rest 91. A couple times a year, would you say I would be safe without the wires? Running map 2 or 5. I'm just scared of the installation process, idc about the 25 dollars it costs to buy them.
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      06-18-2014, 08:50 AM   #7
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http://www.economist.com/blogs/babba...octane-ratings

the higher your octane, the more advanced timing and higher cylinder pressures you can run (article kinda speaks to that, but keep in mind the intended audience).

Going off of what Mike said - to take advantage of your better-than-91-oct fuel, FF wires.
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      06-18-2014, 12:03 PM   #8
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If I am reading this right, then FF wires are only for E85. That also makes sense as the fuel pressure is probably being bumped up to make up for the extra fuel volume being run by E85. High octane gas would not need this as it does not need a great volume of fuel. Pay attention to map 5 and 7 descriptions.

Maps:

Map 0: JB4 disabled.
Map 1: 12.5psi. Suggested for most racing applications.
Map 2: 14psi. Suggested for those with a high flow exhaust and 93 RM2 or higher octane.
Map 3: Progressive meth mapping with flow sensor failsafe. Refer to BMS meth installation PDF for setup directions.
Map 4: Stock map w/ CAN active.
Map 5: Autotuning. Adjusts boost curve from 11psi peak to 16psi peak based on octane, mods, climate, etc. For those running E85 fuels up to a 40% mix can be used along with the flex fuel add on connector.
Map 6: Custom tuning map.
Map 7: 16psi race gas map. 100+ RM2 octane race gas required.
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      06-18-2014, 12:33 PM   #9
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Quote:
Originally Posted by JETmn View Post
If I am reading this right, then FF wires are only for E85. That also makes sense as the fuel pressure is probably being bumped up to make up for the extra fuel volume being run by E85. High octane gas would not need this as it does not need a great volume of fuel. Pay attention to map 5 and 7 descriptions.

Maps:

Map 0: JB4 disabled.
Map 1: 12.5psi. Suggested for most racing applications.
Map 2: 14psi. Suggested for those with a high flow exhaust and 93 RM2 or higher octane.
Map 3: Progressive meth mapping with flow sensor failsafe. Refer to BMS meth installation PDF for setup directions.
Map 4: Stock map w/ CAN active.
Map 5: Autotuning. Adjusts boost curve from 11psi peak to 16psi peak based on octane, mods, climate, etc. For those running E85 fuels up to a 40% mix can be used along with the flex fuel add on connector.
Map 6: Custom tuning map.
Map 7: 16psi race gas map. 100+ RM2 octane race gas required.
FF wired are also needed/suggested for any higher than 93 oct gas. FF basically tricks the car into feeding more fuel.. the higher the psi the more fuel you'll need or you'll end up running lean..
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      06-18-2014, 02:24 PM   #10
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Quote:
Originally Posted by 1cleann55 View Post
FF wired are also needed/suggested for any higher than 93 oct gas. FF basically tricks the car into feeding more fuel.. the higher the psi the more fuel you'll need or you'll end up running lean..
Then why doesn't map 7 say FF wires required like 5 does for E85? I'll check with Terry as I am curious too.
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      06-18-2014, 04:28 PM   #11
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Got a response from Terry and he recommends them any time you go over 15psi. So yes, you probably should have them in your application.

As far as the wires go, it is no big deal to put them on. You don't cut the car's harness at all, it gets added in the JB4 harness. I was done in under 30 minutes including soldering the wires up.
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      06-19-2014, 05:53 PM   #12
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Quote:
Originally Posted by JETmn View Post
Got a response from Terry and he recommends them any time you go over 15psi. So yes, you probably should have them in your application.

As far as the wires go, it is no big deal to put them on. You don't cut the car's harness at all, it gets added in the JB4 harness. I was done in under 30 minutes including soldering the wires up.
Ok, thank you very much for going through the trouble to figure that out. I'll place an order for them soon.
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      06-20-2014, 09:17 AM   #13
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Quote:
Originally Posted by SRT14PimPin07 View Post
Ok, thank you very much for going through the trouble to figure that out. I'll place an order for them soon.
No problem, I was curious too. I wish there was a better place with all of the data in one spot. It is hard to find an answer to the question you have sometimes.
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