Can I switch between fuel maps on the fly with MS.
Forum rules
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
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RauchOffRoad
- MegaSquirt Newbie
- Posts: 2
- Joined: Sat Jan 28, 2006 4:48 pm
- Contact:
Can I switch between fuel maps on the fly with MS.
I'd like to be able to tune the system for best performance and best milage and be able to switch between the two on the fly.
89 Toyota 4x4 3vze.
RauchOffRoad
please read this first;
http://megasquirt.sourceforge.net/extra ... witch.html
yes, you can change fuel maps, but it is generally not useful except for specific applications you are trying to solve. It may help some when changing high altitude.
give us more specifics; do you want to do this with a switch, automatically based on some parameter...... what are you running? MS1 version?, what firmware? etc.
You can change fuel tables based on a switch, or you can set some output based on an engine parameter like rpm and then hook that output to change table automatically instead of a switch.
please read this first;
http://megasquirt.sourceforge.net/extra ... witch.html
yes, you can change fuel maps, but it is generally not useful except for specific applications you are trying to solve. It may help some when changing high altitude.
give us more specifics; do you want to do this with a switch, automatically based on some parameter...... what are you running? MS1 version?, what firmware? etc.
You can change fuel tables based on a switch, or you can set some output based on an engine parameter like rpm and then hook that output to change table automatically instead of a switch.
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Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
As Eric explains here:
http://www.msefi.com/viewtopic.php?p=84460𔧬
Lance.
http://www.msefi.com/viewtopic.php?p=84460𔧬
So the real 'switch' is your right foot...Switching fuel maps typically is done for gasoline versus LPG or something, since switching fuel maps for one type of fuel is a "carburetorism" that you don't need with a properly tuned EFI setup (the low load part of the tune is set for economy and the high load is tuned for power; trivial with EFI, hard with carbs).
Lance.
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RauchOffRoad
- MegaSquirt Newbie
- Posts: 2
- Joined: Sat Jan 28, 2006 4:48 pm
- Contact:
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Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
RauchOffRoad,
With MS-II you have a 12x12 AFR table, allowing you to specify the EGO feedback AFR under 144 different operating conditions (assuming you have a wideband controller that can actually measure these AFRs).
In any case, you have a 12 x 12 VE table that can be used to adjust the fuelling (and thus the AFR) under 144 conditions (apart from the EGO feedback).
The lower part of those 12 x 12 tables is for increased economy (high AFR), the upper part for performance (low AFR).
However, before making a choice, you really should read more about tuning (http://www.megasquirt.info/ms2/tune.htm).
Lance.
With MS-II you have a 12x12 AFR table, allowing you to specify the EGO feedback AFR under 144 different operating conditions (assuming you have a wideband controller that can actually measure these AFRs).
In any case, you have a 12 x 12 VE table that can be used to adjust the fuelling (and thus the AFR) under 144 conditions (apart from the EGO feedback).
The lower part of those 12 x 12 tables is for increased economy (high AFR), the upper part for performance (low AFR).
However, before making a choice, you really should read more about tuning (http://www.megasquirt.info/ms2/tune.htm).
Lance.