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markus8291 markus8291 is offline
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Default drop in mpg with FF wires? - 08-12-2014, 01:48 PM

I've noticed that my gas mileage has decreased by about 3-4 mpg every since I've installed the ff wires. I hardly ever run E85 and even if I just run map 4 for a whole tank, I don't get nearly what I used to get. Is it possible that this is due to the ff wires? Are they telling the sensor to dump more fuel in no matter what? I used to average 32mpg before my ff wires but with the jb4.

Thanks for the input!


2011 BMW 335i xDrive M-Sport, Alpina B3 TCU flash, JB4 (ISO 5.9), FF wires, BMS Intake, BMS CP, BMS DP, VRSF 7" FMIC, KW V1's
2011 BMW 335xi : 12.567 @ 109.750 MPH
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Terry @ BMS Terry @ BMS is offline
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Default 08-12-2014, 02:50 PM

Generally won't have any effect.. Must be something else. If you want to test it just set open loop to 0. That is the same as no FF connector.


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markus8291 markus8291 is offline
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Default 08-12-2014, 02:56 PM

Quote:
Originally Posted by Terry @ BMS
Generally won't have any effect.. Must be something else. If you want to test it just set open loop to 0. That is the same as no FF connector.
good to know! Thanks Terry!


2011 BMW 335i xDrive M-Sport, Alpina B3 TCU flash, JB4 (ISO 5.9), FF wires, BMS Intake, BMS CP, BMS DP, VRSF 7" FMIC, KW V1's
2011 BMW 335xi : 12.567 @ 109.750 MPH
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iuhutch iuhutch is offline
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Default 08-12-2014, 03:25 PM

If running e85 then yes, or in general yes in mpg drop too.

Running 50e85/50-93cot i see around 300 miles per tank on reg driving; even less under aggressive driving...

For comparison, under 100% 93, I see closer to 400 miles per tank.
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boostedbrisbane boostedbrisbane is offline
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Default 08-12-2014, 11:05 PM

with e85 MPG goes down but the fun factor goes up...

running E85 has increased my fuel usage massively
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markus8291 markus8291 is offline
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Default 08-13-2014, 12:06 PM

Quote:
Originally Posted by iuhutch
If running e85 then yes, or in general yes in mpg drop too.

Running 50e85/50-93cot i see around 300 miles per tank on reg driving; even less under aggressive driving...

For comparison, under 100% 93, I see closer to 400 miles per tank.
I used to get about 400 miles per tank on 92 but it has gone down to about 300 for some reason.


2011 BMW 335i xDrive M-Sport, Alpina B3 TCU flash, JB4 (ISO 5.9), FF wires, BMS Intake, BMS CP, BMS DP, VRSF 7" FMIC, KW V1's
2011 BMW 335xi : 12.567 @ 109.750 MPH
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JETmn JETmn is offline
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Default 08-13-2014, 01:14 PM

Quote:
Originally Posted by Terry @ BMS
Generally won't have any effect.. Must be something else. If you want to test it just set open loop to 0. That is the same as no FF connector.
If setting this to 0 will get rid of the flex fuel adjustment, can we set this to a higher number to richen up the car if we want?

Also, is this enrichment active all the time or only when under boost and/or over a certain throttle percentage? I have been trying to piece together what all the JB4 actually does so I know its capabilities, but that has been difficult with tidbits of information here and there.
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markus8291 markus8291 is offline
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Default 08-13-2014, 01:42 PM

Quote:
Originally Posted by JETmn
If setting this to 0 will get rid of the flex fuel adjustment, can we set this to a higher number to richen up the car if we want?

Also, is this enrichment active all the time or only when under boost and/or over a certain throttle percentage? I have been trying to piece together what all the JB4 actually does so I know its capabilities, but that has been difficult with tidbits of information here and there.
I'm gonna piggy back on that question even though it's a little off topic...I have the auto shift damper setting at 60 just like the ISO doc suggests it but I'd love to know exactly what it does. I'm assuming it progressively goes full throttle after shifting in order to save the tranny but wanted to know if that can be changed without blowing anything up?


2011 BMW 335i xDrive M-Sport, Alpina B3 TCU flash, JB4 (ISO 5.9), FF wires, BMS Intake, BMS CP, BMS DP, VRSF 7" FMIC, KW V1's
2011 BMW 335xi : 12.567 @ 109.750 MPH
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MadToy MadToy is offline
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Default 08-13-2014, 01:57 PM

Quote:
Originally Posted by JETmn
If setting this to 0 will get rid of the flex fuel adjustment, can we set this to a higher number to richen up the car if we want?

Also, is this enrichment active all the time or only when under boost and/or over a certain throttle percentage? I have been trying to piece together what all the JB4 actually does so I know its capabilities, but that has been difficult with tidbits of information here and there.
It would only be active during Boost/open loop I would think. Normal closed loop driving will always adjust to 14.7 AFR.

I put the FF wires on last week, and just recorded 29.4 mpg (30.1 mpg on iDrive) on a 400 mile round trip through the NC/TN mountain highways.
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JETmn JETmn is offline
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Default 08-14-2014, 06:18 AM

I wish there was a way to tag Terry. Another great technical thread getting ignored...
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