MAFT-Pro Tuning Thread Unofficial and Uncensored

[chriso]

I have been having trouble setting up my MAFT-Pro unit from day one. I was hoping that by posting my settings, someone who is a lot smarter and experienced than me would be able to point me in the right direction and explain what I am doing wrong.

Below are the settings presently on my unit. Most of them are "as shipped" and have not been changed due to either the lack of proper explanation and documentation or the fact that I don't dare change them for fear of blowing up my car. I am having trouble with the idle, AFR fluctuation at most all RPM's, Cruise, Boost and WOT settings. These seem to be common issues with all the people I have talked to.

My vehicle is a 1990 Supra Turbo. Mods include: 60-1 Trim CT-26 Upgraded Turbo, AFPR set at 34 psi running, Walbro 255l/h pump, RC 550's, full 3" turbo back exhaust with a high flow cat and flowmaster muffler. Timing is set at 11 BTDC. Brand new NGK plug wires and NGK 6097 plugs set at 0.030". Idle vacuum is a rch over 20 inches. MAFT-Pro is set up for Speed Density mode with the IAT sensor located in the 3000 pipe adjacent to the throttle body. All wires have been soldered into the ECU harness and no wires have been cut. I am also running the boost control function that came optional with the unit and am hoping to run between 16 and 18 psi. I am using Version 4.65.

Any help would be greatly appreciated.

Menus My Settings
Config
Vehicle Select 0
# of Cyl 6
Displ 3.00
Airfl Mode Speed Density
MAP Source GM 3 Bar
DENS Srce Use MAP
Baro Mode Sealevel
F Out Mode Supra MKIII
V Out 1 mde Use Setpoint
V Out2 Mde Use Setpoint
AFR Source 5V AEM Guage
F In Mode Supra MKIII
Aux 1 Mode Aux Trig Off

Setup
Mainscale -10.00
V Out1 Set 2.500
V Out2 Set 3.600
Afterstart 0.0
Lo Load Pt 36.4
Mid Load Pt 100.1
Hi Load Pt 143.0
Freq Out Max 0
Timing Mon Base 0.00
Timing Monitor Corr 1.27
AFR Tracking Delay 0.0
FE Smoothing 00
Use VE Table #1
Spk Base 0.0

Boost Control
TPS Spool 2.000
RPM Spool 2400
TPS Start 2.800
PSI Start 13.0
DC% Start 50.00
PSI Set 16.0
PSI Aux 14.0
Gain 10.0
DC % Start Aux 10.0
Max RPM 0

AFR Tracking
Min TPS 2.440
Min RPM 3488
Min MAP 148.2
Lean Lim% 5.0
Rich Lim% 25.0
Gain 4.0
AFR2000R 11.5
AFR3000R 11.5
AFR4000R 11.5
AFR5000R 11.5
AFR6000R 11.5
AFR7000R 11.5
AFR8000R 11.5
Aux % 0.0

Air Temp
-40.00 0.0%
13.00 0.0%
41.00 0.0%
62.00 0.0%
82.00 0.0%
103.00 0.0%
129.00 0.0%
173.00 0.0%
212.00 0.0%

Aux Triggered
All 0.0%

Tuning
RPM High Mid Low
400 -10.0 -10.0 -10.0
800 -10.0 -10.0 -10.0
1200 -10.0 -10.0 -10.0
1600 -8.0 -10.0 -10.0
2200 -8.0 -8.0 -10.0
2800 -5.0 -6.0 -8.0
3400 0.0 -6.0 -5.0
4000 0.0 -5.0 -5.0
4600 0.0 0.0 0.0
5200 0.0 0.0 0.0
5800 0.0 0.0 0.0
6400 0.0 0.0 0.0
7000 0.0 0.0 0.0
7600 0.0 0.0 0.0

Tune Response
TPS Enrich 0.00
TPS Delay 0.8
TPS Size 7
TPS MAP Max 104.0
MAP Enrich 0.2
Boost Enrich 0.4
MAP TPS Min 0.5
MAP RPM Min 640.00
MAF Limit TPS Threshold 0.00
MAF Limit 0.00
MAF Limit/KRPM 0.00

Timing Monitor
Spark WOT Spark Aux
2000 0.0 0.0
2500 0.0 0.0
3000 0.0 0.0
3500 0.0 0.0
4000 0.0 0.0
4500 0.0 0.0
5000 0.0 0.0
5500 0.0 0.0
6000 0.0 0.0
6500 0.0 0.0
7000 0.0 0.0
7500 0.0 0.0
8000 0.0 0.0

PT Tracking
Idle TPS 0.000
Idle RPM 640
Idle A/F 13.5
Cruise TPS 2.500
Cruise RPM 2560
Cruise MAP 91.0
Cruise A/F 13.5
Lean Delay 10.0
Gain 15.0
Lean A/F 16.0

 

[supralover2000]

can you be more specific about what problems you are having? actually what would really help is if you had a log and a CSV file from the tunerpro. that way I/we can see exactly how the car is running and perhaps we can make recommendation.
PS. from the look of things, since you've lowered the Fp to 34psi that has your 550 injectors flowing at approximately 486cc at idle. with the mainscale set to -10 like you have it that puts the signal sent to the ecu, at around the same that the stock 440cc would have (good thing). now if you've connected the vf reader, just check to see what the vf is and try to adjust it so it holds correctly. that should take care of the idle for you. The other thing Ive noticed is that you are not pulling any fuel out on your hi map (where it counts). this could be the reason why the car is doing what its doing. Anyways, log a run and post it along with your bin so we may further investigate.

Wellington

 

[chriso]

can you be more specific about what problems you are having? actually what would really help is if you had a log and a CSV file from the tunerpro. that way I/we can see exactly how the car is running and perhaps we can make recommendation.
PS. from the look of things, since you've lowered the Fp to 34psi that has your 550 injectors flowing at approximately 486cc at idle. with the mainscale set to -10 like you have it that puts the signal sent to the ecu, at around the same that the stock 440cc would have (good thing). now if you've connected the vf reader, just check to see what the vf is and try to adjust it so it holds correctly. that should take care of the idle for you. The other thing Ive noticed is that you are not pulling any fuel out on your hi map (where it counts). this could be the reason why the car is doing what its doing. Anyways, log a run and post it along with your bin so we may further investigate.

Wellington

Wellington, Thanks for the response. A couple of clarifications though:
Should I raise the fp to say about 36-38 and then change the mainscale?
Should the Vf reading stay constant around 2.5V? (I read that somewhere). Mine jumps around and sometimes stays constant at 4.44.
I haven't adjusted any of the Lo, Mid and High settings because I really don't know where I am going with this yet. When you say "pull fuel out" do you mean to decrease it, to lean it out?
Again, thanks for the help. I logged a couple of files this evening. I will try to post them on here but it won't let me upload *.bin or *.adl files.

 

[chriso]

Here are the log files from this evening and my current bin file.

 

[supralover2000]

are you running the stock AFM in addition to the Maftpro? if not then you need to change the Fin Mode to 0 for "no maft connected". Also, from the CSV file that you sent, it looks like you also have the part throttle afr tracking enabled. if that is the case, then you have to disconnect the stock 02 sensor.... more to come

 

[chriso]

are you running the stock AFM in addition to the Maftpro? if not then you need to change the Fin Mode to 0 for "no maft connected". Also, from the CSV file that you sent, it looks like you also have the part throttle afr tracking enabled. if that is the case, then you have to disconnect the stock 02 sensor.... more to come

No AFM installed at all due to speed density mode, just a filter connected to my turbo inlet. When I upgraded to version 4.65 the option changed to "Supra MKIII" which I set it to. Should I still disconnect the stock O2 sensor? I didn't know this, if so ,won't that affect my idle and closed loop operation?

 

[malloynx]

also... use ve table 2..

and v-out2 to 4.00


also why are you pulling fuel part throttle? the TCCS is going to do it's own thing if you not using PT. get the FP dialed in and let the stock o2 do it's job.

once you go WOT you can pull or add all the fuel you want

 

[CPT Furious]

Are the rich and lean limits really 5 and 25%? That seems strange to me. Also, what does V-out2 to 4.00 do as opposed to "use setpoint"?

 

[Mo87NA]

Great info. so far. I'll be ordering my Maft Pro soon and I know I'm going to have many of the same problems. Keep it coming.


Mo

 

[malloynx]

lane,, you can set the limits to whatever you want. i have mine +/- 10%

 

[tookwik4u89]

also... use ve table 2..

and v-out2 to 4.00

Mike, what does this do? Everything I've seen says table #1 and v0ut2 3.6

 

[chriso]

Mike, what does this do? Everything I've seen says table #1 and v0ut2 3.6

I'm curious to know what the setting changes do and what effect they are supposed to have.

So am I keeping my O2 sensor plugged in?

Also for you guys wondering about my initial settings. Don't try this at home !!! My setup is not working very well so don't use them. When I get this thing working - and God knows I will eventually, I will post a full updated and working *.bin file for you guys to work with.

Thanks for the help so far guys ::salute::

 

[tookwik4u89]

I wouldnt mess with the o2 & pt tracking until you get it straight, i couldnt get idle right that way. Im a little confused exactly what your problems are, whats the prob at idle? It will run richer at start then come down in closed loop, mine is 14.7. It took me awhile to fig boost control, but im gettin close now. the wot tracking works great. What does it do with a/f under boost?

 

[malloynx]

ve table 2 is for a motor pull good vac at idle and running stock cams..

i dunno what the 4.00 does however that is what i have it set at..

maybe bob can step in and give us a hand

on side note i hit 26psi today with no FC

 

[chriso]

ve table 2 is for a motor pull good vac at idle and running stock cams..

i dunno what the 4.00 does however that is what i have it set at..

maybe bob can step in and give us a hand

on side note i hit 26psi today with no FC

26 - that is awesome !!!

I changed my VE Table to #2 and upped the Vout2 to 4.00. The engine ran a little smoother at idle after about 15 minutes of settling out. However, the idle was surging every few seconds. It would be around 650 then go up to 850 and then back down and cycle over again. I haven't taken it out on the road yet. I usually do this on the highway at night when I can open her up a little with no traffice and my radar detector.

Another question as far as the tracking goes. Everything seems to be based on open loop or WOT throttle settings. Is WOT considered to be anything between 3/4 and floored TPS voltage? If so, then what would the Lo, Mid and High Tunes be based on or should I just leave these numbers alone (36.4, 100.1 and 143.0) and aren't these MAP references?

Sorry for all the fundamental questions but hopefully these layman's terms will not only benefit me but everyone else on here. I have a better understanding of what I am doing if I know why instead of just punching in numbers.
Thanks again guys !

 

[chriso]

I wouldnt mess with the o2 & pt tracking until you get it straight, i couldnt get idle right that way. Im a little confused exactly what your problems are, whats the prob at idle? It will run richer at start then come down in closed loop, mine is 14.7. It took me awhile to fig boost control, but im gettin close now. the wot tracking works great. What does it do with a/f under boost?

AFR under boost is very erratic. In the beginning of the boost (3-6psi) it will be around 13.5 or so (it varies) and then it drops down towards rich (<10) after a few seconds during boosting (around 5-10psi). It is shown on my logs in the first couple threads of this post to see the graphing. I think I spiked at 12 psi but my AFR was below the threshold of my AEM wb gauge. I still don't know exactly what pressure this turbo will run safely since I've been babying it (perhaps Mike can chime in since he used to run this one). Oh and I am also running 91 pump gas (if that matters any).

I realize that I have to remove some fuel to get back in the 11.5 range but I haven't even gotten to that point yet. I would still like to get my idle and cruising stabilized before I go full bore.

What fuel pressure are you guys running with 550's? Like I stated earlier, I am at 34-35psi idle.

What are good AFR numbers to run at boosting pressures? 11.3-11.8 is what I've been reading.

 

[tookwik4u89]

Yes ~ 11.5 under boost is good, I think the starting out leaner then pegging rich is the delay before it comes out of closed loop, then you are too rich, and a/f tracking cant take enough out, especially if your max lean limit in the a/f tracking is set at 5% like that. I have mine higher. I would suggest taking mainscale down, then add fuel if you need it anywhere. maybe -15%. I hope I'm not giving bad info but this worked best for me. I run mainscale -23.0 with 680cc, I add a little fuel on high and mid load around 2500-4500 rpms. The mainscale didnt affect much else for me, the idle and lighter throttle stuff gets smoothed out by closed loop. Idle at13-14.5 depending on what it feels like that day....lol, wot tracking holds me at 11.5 np, but my lean max is 15%. My fuel is 32psi with vac hose off.

 

[tookwik4u89]

Mike....are you using the pro for boost control? What are you guys setting gain at, is anyone having a problem with the boost creeping up past the set psi after 4-5?? seconds?

 

[supralover2000]

Chriso:
First off, did you change the Freq In Mode to 0? you need to do that! if you haven't the maftpro is looking to a signal from the stock afm and its obviously not getting one. Just make sure that its set to 0 which will have the unit make its calculations based on the speed density setup.
Also, do me a favor, turn the ignition to the on position (so that the maftpro is on), set the pro so it displays the tps reading. Now, with your foot off the gas pedal, tell me what the tps is reading.. then press the pedal all the way down to the floorboard (remove floormat if neccessary) and tell me what the reading was then. those two are your low and high points on the tps and you can now figure out where that 75% tps reading is. thats the reading that you will use to plug into the TPS Min setting on the pro for the WOT AFR tracking to be enabled. PS. judging by your CSV file your low point seems to be around .42 volt on your TPS.

 

[chriso]

Chriso:
First off, did you change the Freq In Mode to 0? you need to do that! if you haven't the maftpro is looking to a signal from the stock afm and its obviously not getting one. Just make sure that its set to 0 which will have the unit make its calculations based on the speed density setup.
Also, do me a favor, turn the ignition to the on position (so that the maftpro is on), set the pro so it displays the tps reading. Now, with your foot off the gas pedal, tell me what the tps is reading.. then press the pedal all the way down to the floorboard (remove floormat if neccessary) and tell me what the reading was then. those two are your low and high points on the tps and you can now figure out where that 75% tps reading is. thats the reading that you will use to plug into the TPS Min setting on the pro for the WOT AFR tracking to be enabled. PS. judging by your CSV file your low point seems to be around .42 volt on your TPS.

No, I didn't set the Freq In Mode back to zero because my T-Pro has an option for Supra MKIII and does not go to "0". It has several different car options then goes from 12-200 and that's it. I am running version 4.65 so maybe some options changed from what you are running. Also, my TPS readings are .43-3.47V, therefore my WOT should start at 2.60V, am I right?