Enabling MFA for MPG

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Enabling MFA for MPG

Unread postby SlowBox » Sun May 01, 2016 9:09 pm

Once I check the box, what else is required of me to get it operational? I've been playing with LOLOD to force OL at low loads to get the car using less gas, but I'd much rather stay CL in town and have MFA switch me OL on the highway. In regards to fn1328, I assume I just punch in the lambse I want it to spit out while the strategy is active?
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Re: Enabling MFA for MPG

Unread postby decipha » Sun May 01, 2016 9:11 pm

its already setup in the A9L2 tune just gotta enable it
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Re: Enabling MFA for MPG

Unread postby SlowBox » Sun May 01, 2016 9:14 pm

Figured. Tell me about MFALHH. Is a 35 load hysteresis gonna keep it from jumping back CL as load increases up a hill or back OL as load decreases coming back down? Just seems a little off.
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Re: Enabling MFA for MPG

Unread postby SlowBox » Sun May 01, 2016 10:41 pm

Any way I would be able to modify fn1124 to work at rpms higher than 2k? Say, 1500 to 3000?
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Re: Enabling MFA for MPG

Unread postby SlowBox » Tue May 03, 2016 3:00 pm

SlowBox wrote:Any way I would be able to modify fn1124 to work at rpms higher than 2k? Say, 1500 to 3000?


I've never run off the end of table tuning this car before. Since FN1124 stops at 2k rpm, would the timing I specified in those cells continue as rpm increased? I don't need to adjust it for higher cruise rpm since what I want it to do at 2k is the same as 3k, I'm just not sure what happens after I exceed the tables limitations and I don't have the car with me. Thanks Mike.
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Re: Enabling MFA for MPG

Unread postby SlowBox » Tue May 03, 2016 3:24 pm

Found a FN083 and was able to adjust.
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Re: Enabling MFA for MPG

Unread postby 93BlueFoxGT » Thu Jun 08, 2017 5:08 am

What's the trick for getting MFA to work? I checked the box to enable MFA but never got the car to drop into open loop on the 30 mile highway portion of my commute this morning while keeping the throttle/RPMs as steady as possible the whole time. What criteria must be met for the EEC to enter MFA and are there any parameters that can be changed that will allow MFA mode to be entered more quickly? Thanks!
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Re: Enabling MFA for MPG

Unread postby SlowBox » Thu Jun 08, 2017 7:25 am

Use the difference tool and look through what I have my MFA related scalars and MFA table set to. There are RPM and load requirements that have to be satisfied before you even get into adjusting how much fuel is pulled and when. But, depending on your setup, my settings may work for you. I've found that 1.15 to 1.2 lambda up to about 50 perload and dropping off sharply to 1 lambda at 60 perload nets me 5 mpg on the highway and doesn't put too much heat in the motor. YMMV.
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GT-40 upper and lower
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Re: Enabling MFA for MPG

Unread postby 93BlueFoxGT » Thu Jun 08, 2017 9:57 am

Thanks! I'll take a look at your bin file when I get home. For the drive home I'm going to change SWTCNT - MFA State HEGO Switch Requirement from 0 to 10
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Re: Enabling MFA for MPG

Unread postby 93BlueFoxGT » Thu Jun 08, 2017 7:46 pm

Figured it out on the way home. Changed MFASN and SWTCNT a couple times with no success. Then remembered I read something about MFA and transmission type somewhere. Changed TRLOAD from 0 to 3 and as soon as I got up to steady speed, lambse and the wideband went to 1.06 lambda!
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BBK 1.625" Longtubes, 2.5" DR. Gas offroad x-pipe, Magnaflow catback.
Stock T5/3.08 rear

Re: Enabling MFA for MPG

Unread postby SlowBox » Mon Jul 03, 2017 10:52 am

FWIW, I disabled my MFA and opted for biasing the hegos since I can bias lean at cruise for mpg and rich at idle for better idle quality.
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GT-40 upper and lower
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Decapped injectors
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U4P0/U4P2/CBAZA
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Re: Enabling MFA for MPG

Unread postby 93BlueFoxGT » Wed Jul 05, 2017 8:17 am

How far lean can you go with hego biasing? I've been having good luck with MFA commanding 1.25 lambda at very light load then dropping towards stoich as perload increases. Did you switch TRLOAD back to 0? Thanks
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Stock T5/3.08 rear

Re: Enabling MFA for MPG

Unread postby SlowBox » Thu Jul 06, 2017 5:54 am

TRLOAD is still 1. I'll switch it to 0 and see if it helps with the idle spark we talked about. As for biasing the hegos, I don't know how far I can go. I haven't taken any logs yet.
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9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
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Moates QH v1.6

Re: Enabling MFA for MPG

Unread postby jhine5588 » Sun Sep 02, 2018 5:30 am

Have you played with this much more? I was playing around a while ago and just leaned out the LAMBSE to 1.047 cruising at 45% load above 120F while adding some spark.

I'm looking for better spark control cruising however as on the tip in the spark comes up a little higher than I would like.

Also when driving without cruise enabled when the TPS goes closed, spark is down in idle territory- 10-14 degrees. I'd like that to stay closer to 30 when off throttle cruising. I'm getting a little bit of a shudder between off throttle and light throttle cruising on the highway, which I may be able to tune out with DASHPOT, but either way I think keeping timing up a bit more might help with this as well.



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Re: Enabling MFA for MPG

Unread postby decipha » Sun Sep 02, 2018 8:09 am

this is something im been meaning to write code to control as i want it to

for now the easiest way is take fn839 the dashpot CT spark multiplier and set it to something like

3.984 1.992
1.000 1.992
0.500 1.000
0.000 1.000

you'll have to adjust dashpot to get it to function how you want



-or-

you can take fn111 the ct spark vs rpm function and kick it up 15 degrees

then take fn180 the ct spark subtractor for neutral or ct and set it up so remove those 15 degrees after a few seconds like so

255 15.00
7 15.00
2 0.00
0 0.00
0 0.00
0 0.00

only problem with that is you get excessive spark on first fire off
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94 5spd Rionda
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00 Explorer 5L - Bernyce

Re: Enabling MFA for MPG

Unread postby SlowBox » Sun Sep 02, 2018 8:33 pm

I experimented with MFA a lot when I was driving back and forth to DFW a couple of years ago. I found my motor likes around 10% enleanment at 45 perload, tapering to 0 at both 30 and 60 perload. I added 3 degrees at 30 and 45, also tapered to 0 at 60.
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4r70w, 3.73
GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6


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