Fuel Scalar and it's limits (Ethanol)?

[135boost]

Hello, long time since last post.

On my build of n54 and hounting noprep 9 sec 1/4 i buid total new engine to my 4wd E82.

i have a issue with fuel scalars maxxed out to 1.60 and as chris said, there is no hard limit 1.60, but 2.01
and that is enough headroom to play with at this moment


mods what caused this was big valve 235cfm@12mm 175cfm@12mm (stock 159cfm intake) cylinder head with
big lift cams.

i have search for ijeos xdf where there is that scalar main table to play with.

please, if someone can help me out with this issue because now on 1.60 it run extremely lean.


br.

Jan

 

[TiAgAu]

It's pretty simple to change by right clicking the fuel scalar then choose edit parameter xdf info and change the high range to 2.0000

Or don't worry about it, and just use the ijeos xdf from here scalars can be set to 2.00 max now

 

[135boost]

forgot to thank about help

 

[carabuser]

Just a thought for people running Ethanol. There's a table in the DME that's used as a constant in the fuel mass calcs that might be useful.
The stock cal has the DME set for 1/14.15 for stoich which makes sense as the fuel cap states something about E10 being OK.

This is the address for INA0S:
I have the conversion set as: 1/(X*0.000001907225146868086).

@135boost Maybe this would help you avoid having to use scalars to correct and potentially keep the DME happy at higher blends. This value should in theory compensate but I haven't tested since I don't get E85 here. The IJE0S address is 0x4BD8E

 

[RSL]

There's an MAF mff monitor that probably ties in somewhere. I recognized the 14.15 AFR from one I defined, INA0S is 4BF0A. It's also stoich constant for lambda.

 

[KClemente]

Just a thought for people running Ethanol. There's a table in the DME that's used as a constant in the fuel mass calcs that might be useful.
The stock cal has the DME set for 1/14.15 for stoich which makes sense as the fuel cap states something about E10 being OK.

This is the address for INA0S:
I have the conversion set as: 1/(X*0.000001907225146868086).

View attachment 61890

@135boost Maybe this would help you avoid having to use scalars to correct and potentially keep the DME happy at higher blends. This value should in theory compensate but I haven't tested since I don't get E85 here. The IJE0S address is 0x4BD8E

I'll try it out with E70-E85 next time I fuel up. I8A0S is 0x421F4.

In theory, all I would have to do is input 9.77 and now the DME will automatically change its calculation in injection quantity.

 

[carabuser]

I'll try it out with E70-E85 next time I fuel up. I8A0S is 0x421F4.

In theory, all I would have to do is input 9.77 and now the DME will automatically change its calculation in injection quantity.

That's the theory. It's used as a factor of the fuel mass target so that should request a load more fuel from the injectors.

Keep an eye on afr for the first run with the MHD gauges. I'd also reset trims.

 

[General.Massacre]

Innovation to the max always like seeing new info i didnt know. good going

 

[KClemente]

Tried it out with E70-E85 (my ethanol tester is broken but this station is known for that variance) and as you can see in the datalog, it starts off high and then reaches a bit of an equilibrium. As soon as I start driving, trims immediately go crazy and will easy hit 50 aka 34% stft.

Fuel trims were set to 1.0 across the board.

Additional information

Firmware	Interface	Engine	TMAP_V	AvgIgn	DWP	MethTriggerMode	FF	MethSafeMode	MethAdd	MethScale	MethPSI	E85_Setup	VFF_Offset	fuel_30	fuel_35	fuel_40	fuel_45	fuel_50	fuel_55	fuel_60	fuel_65	fuel_70
32/16//2	JB4 iOS 9432	E Series - N54	1.9	3.5	60	0	65	0	0	0	0.0	8	132	0	0	0	0	0	0	0	0	0

BoostSafety	PID Gain	AutoShiftRed	Fuel_OL	FUA	1st_limiter	2nd_limiter	3rd_limiter	Options	N20_TMAP	6CylMode	LastSafety	duty_15	duty_20	duty_25	duty_30	duty_35	duty_40	duty_45	duty_50	duty_55	duty_60	duty_65	duty_70
28.0	30	0	0	0	16.0	0.0	0.0	108	1	4	0	50	50	50	50	50	54	58	60	64	66	68	70

Hide legend Reset zoom

 

[carabuser]

Tried it out with E70-E85 (my ethanol tester is broken but this station is known for that variance) and as you can see in the datalog, it starts off high and then reaches a bit of an equilibrium. As soon as I start driving, trims immediately go crazy and will easy hit 50 aka 34% stft.

Fuel trims were set to 1.0 across the board.