Setting up a MAFT-pro in AFC mode...

[Doward]

Hmm... now this is a PITA.

Supra's running good so far - but I'm not showing FI or FO (both read 0) - I'm trying to use the MAFT-pro in AFC mode, as I want to make a map of the stock TCCS frequency output vs rpm/tps (and try to see if I can come up with a better VE map than the Pro comes with stock)

Just killing time until my WB02 gets back

Anyone got the MAFT-Pro running in AFC mode?

 

[Doward]

Nobody?

 

[CRE]

Are you certain of the settings in the "Setup Menu"? And have you wired the MAFT Pro in so that it's intercepting the AFM's signal and feeding it back out to the TCCS?

 

[drjonez]

settings? connections? did you mod your unit for the timing monitor?

 

[Doward]

I did not mod the unit for Timing Monitor (Mike, did you?)

Yellow wire is KS ('88 here) in, and green is KS out to ECU.

Settings of Fout Mode to Supra MKIII and Fin Mode to Supra MKIII - I run STUPID rich (we're talking straight up black smoke out the tailpipe) when I try this.

Weird thing is - according to the 'latest' manual (no idea what version it is for) #34 is Fin Mode for Supra MKIII. I tried it as well, with no avail.

Also tried Fout mode as 0 (as per the manual at fullthrottletech.com) and still no FI or FO readings

I'll play with it more tomorrow, and report back. Sold off my '88 Camaro and '90 Firebird today

 

[thedave925]

V.1 manual says that AFC mode is activated by setting Fout to 0.

It sounds like you want to read the signal from the AFM using AFC mode.

For AFC mode, you would have to TEE in the green wire from the Maft-Pro to the Ks wire going to the ECU. That is where you would receive the signal from. This way you can monitor, but can't modify the AFM signal. You should be able to see the Fin and Fout.

Speed density requires that you CUT the Ks wire and splice the green wire directly to the ECU side of the Ks wire. Now your AFM signal is not coming from the AFM itself, but the MAP sensor and IAT combo going to the Maft-Pro, and then the ECU sees the Maft-Pro's version of the AFM signal.

--->Someone chime in if that's wrong<----

Edit: Yellow is the AFM side of the Ks wire

My Maft-Pro install was on an 89+ harness.
Ks (AirFlowSensor) wire color is Mintgreen with red stripe.
THA (AirTempSensor) wire color is solid Mintgreen

I hope this helps and ask away if anything is confusing. I also have all of the wire to wire colors noted if you need a cross reference.
-Dave

 

[CRE]

Doesn't the MAFT Pro still need to change the signal to KS for any adjustment in AFC mode to have any effect? I'm pretty sure the MAFT Pro needs to be wired inline (ie: the KS line from the AFM needs to be cut and the MAFT Pro wired in between).

The fact that you've got no readings for F-In indicates either a bad setting or connection to the yellow wire on the 10 pin harness (Pin #9).

I imagine that if you reversed the wiring for pins #9 and #4 on the 10 pin harness you'd see 0 for both F-In and F-Out. The Maft Pro only modifies whatever signal is coming in. If pin #9 is running to the ECU there'll be no signal for it to see. So double check which line is reading from KS and which is feeding KS.

 

[drjonez]

I did not mod the unit for Timing Monitor (Mike, did you?)

which mike? malloy? if so, then yes he did and that's your problem.

more later...

 

[Doward]

Yep - I've got Mike's old system. Do tell, good Doctor - what's the prognosis? I've haven't touched timing monitor (yet)

Yes, for the MAFT-pro to adjust the signal, it must intercept the signal (aka, you must cut the KS wire, and feed one end into the MAFT-pro, and one end out to the ECU) Also, if you just disconnect the AFM, the only signal in SD mode going to the AFM is from the MAFT-Pro - this is how I'm currently running it

 

[thedave925]

I'm all up to learning the details of the timing aspect of the maft-pro. "It monitors, it tunes, it's self regulating, AND it controls timing" lol <-- informercial. Unbelievable what this piggy back is capable of.

 

[CRE]

Doward - As far as I can tell you've got two options. Setup timing monitoring or resolder/replace the pull up resistor (R7 I believe). I don't know if Mike removed the resistor completely or just clipped or desoldered one of the leads.


Personally, when I make the move to setup timing monitoring (and timing control not too long thereafter) I'm putting in either a switch or a jumper.

 

[Doward]

Oh hell - I forgot about that resistor Dammit, I'll look into it.

Hmm... I'll email Zeitronix and see how much longer they'll have my WB02 controller - I'm just anxious to work on the VE tables

For now, a 5% reduction in fuel across the board (-5.0% mainscale) has smooth out a lot of idle issues I had - but this is a bandaid approach, and not what I want to do :3d_frown:

The entire premise of me going MAFT-pro was simple - I wanted to replace the AFM with something that would be compatible with the TCCS, while offering vastly improved throttle response. The MAFT-Pro is replacing my AFM, and via the volumetric efficiency tables, will output the correct airflow to the TCCS that my motor is ingesting.

When I hit FC on the 57trim, I will go with 550cc injectors, mainscale -25%, and adjust my timing under boost accordingly.

Here's my plans:
1) Create a proper VE table for the stock 7MGTE
2) Create a timing map for the stock 7MGTE
3) 550s and -25% mainscale
4) Re-create stock timing map (maybe with a few tweaks )
5) Enjoy until I reach the limits of my timing adjustment (standalone after that!)

 

[drjonez]

Hmm... now this is a PITA.

Supra's running good so far - but I'm not showing FI or FO (both read 0) - I'm trying to use the MAFT-pro in AFC mode, as I want to make a map of the stock TCCS frequency output vs rpm/tps (and try to see if I can come up with a better VE map than the Pro comes with stock)

Just killing time until my WB02 gets back

Anyone got the MAFT-Pro running in AFC mode?

it doesn't work because you are using malloy's old unit w/the FI pull-up resistor clipped. you will need to reconnect it in order to enable the MAFT pro to read FI. check your codes, you probably have the AFM related ones since the ECU isn't seeing any freq input.

Doesn't the MAFT Pro still need to change the signal to KS for any adjustment in AFC mode to have any effect? I'm pretty sure the MAFT Pro needs to be wired inline (ie: the KS line from the AFM needs to be cut and the MAFT Pro wired in between).

depends on what you want to do. if he just wanted to map the VE table, then simply tapping KS would be acceptable. if he wants to scale it, he'll need to put the MAFT pro inline.

I'm all up to learning the details of the timing aspect of the maft-pro. "It monitors, it tunes, it's self regulating, AND it controls timing" lol <-- informercial. Unbelievable what this piggy back is capable of.

yup, sure is.

Doward - As far as I can tell you've got two options. Setup timing monitoring or resolder/replace the pull up resistor (R7 I believe). I don't know if Mike removed the resistor completely or just clipped or desoldered one of the leads.

sorta.

the timing monitor can only be used in speed/density mode....since you're using Fin.

mike did use the timing monitor. how he disconnected R7, i don't know.

Personally, when I make the move to setup timing monitoring (and timing control not too long thereafter) I'm putting in either a switch or a jumper.

yup, that's a good idea.

Oh hell - I forgot about that resistor Dammit, I'll look into it.

Hmm... I'll email Zeitronix and see how much longer they'll have my WB02 controller - I'm just anxious to work on the VE tables

For now, a 5% reduction in fuel across the board (-5.0% mainscale) has smooth out a lot of idle issues I had - but this is a bandaid approach, and not what I want to do :3d_frown:

The entire premise of me going MAFT-pro was simple - I wanted to replace the AFM with something that would be compatible with the TCCS, while offering vastly improved throttle response. The MAFT-Pro is replacing my AFM, and via the volumetric efficiency tables, will output the correct airflow to the TCCS that my motor is ingesting.

When I hit FC on the 57trim, I will go with 550cc injectors, mainscale -25%, and adjust my timing under boost accordingly.

Here's my plans:
1) Create a proper VE table for the stock 7MGTE
2) Create a timing map for the stock 7MGTE
3) 550s and -25% mainscale
4) Re-create stock timing map (maybe with a few tweaks )
5) Enjoy until I reach the limits of my timing adjustment (standalone after that!)

sounds like a good plan!

 

[CRE]

Doward - Since you're already using the MAFT Pro for scaling check out the aforementioned resistor. If it's still present and there's enough lead left to solder it back in, you're set. If the resistor's been pulled let me know and I'll look and see what size resistor you'll need to replace it.


Thanks for the info Doc! I didn't realize timing monitoring could only be used if you're running speed density... keep forgetting it needs a signal for cam/crank position.

Has Bob considered copying the routine for that function to another pin? I suppose that's the issue you were referring to when I mentioned wanting to setup timing control on my N/A?

 

[drjonez]

Doward - Since you're already using the MAFT Pro for scaling check out the aforementioned resistor. If it's still present and there's enough lead left to solder it back in, you're set. If the resistor's been pulled let me know and I'll look and see what size resistor you'll need to replace it.

not sure how he's scaling w/o that resistor.

Thanks for the info Doc! I didn't realize timing monitoring could only be used if you're running speed density... keep forgetting it needs a signal for cam/crank position.

yeah, it's just inherant to the I/O used.

Has Bob considered copying the routine for that function to another pin? I suppose that's the issue you were referring to when I mentioned wanting to setup timing control on my N/A?

nope, i was more referring to the format of the signal.

 

[CRE]

not sure how he's scaling w/o that resistor.

Beats me, I may have misunderstood. Below are the comments that lead me to believe he's already scaling his fuel.

For now, a 5% reduction in fuel across the board (-5.0% mainscale) has smooth out a lot of idle issues I had - but this is a bandaid approach, and not what I want to do :3d_frown:

Also, if you just disconnect the AFM, the only signal in SD mode going to the AFM is from the MAFT-Pro - this is how I'm currently running it :wink:

He's just running off the Pro's Map using SpdDen mode? How..... odd. But, I think I get it. No FI to worry about then.

 

[drjonez]

ah, i missed the stuff where he switched over the SD....

 

[turbobob]

just noticed this thread.

The pullup resistor can be placed externally...... for running AFC mode.

What software version? You should probably update to 4.80

in 4.80, AFC mode is done differently. You select Translator Mode in the config menu and just set the F In mode and F Out mode to the same thing.

Bob

 

[Doward]

I am running 4.80, Bob

I'm trying to decide what will work best for what I need. I've got a good VE map going now, with AFRs where I want them... I really REALLY wish the VE table had better resolution though - namely between 1600-2000rpm, and between 20-40kPa (a 2000rpm and a 30kPa column/row would be GREAT).

The problem I have though, is that even though I show a 14.7:1 afr say... at idle, my VF is reading 0.0.. if I lean it out a little, I go up to a 15-16:1, and start getting a lean stumble - and VF doesn't change. I'll work with it some more, though, and see if I can work that part out.

Oh hey, when the MAFT-pro says it's in a particular cell, 0-255, where is that starting, and ending? It's not an X/Y coordinate, so I figure it must be going either by column, or by row - could you perhaps explain this a little?

My part throttle response is excellent. Now I need to find that timing adjustment setup guide, and start building a timing map, so I know how far to scale it after I pop the 550's in.

 

[turbobob]

4.80 runs really well.

The resolution could be changed. Perhaps this season I can work on something I have fiddled around with exactly what you are asking for, it takes a bit of work to do it, but is possible.

Keep working on what you have, and we can work together on adjusting the thresholds.

The cell numbers start at 1 for the left, bottom corner and count across. 0 means its not "centered" on a cell. I did it this way so you can sort an excell/CSV file by cell.

Bob