This is what a Stock Quest showing what the readings are from a wideband O2 Sensor.
I did for several years on a perfectly running Starion. Idle SHOULD BE 12.5-13.5 if the nose switch is working correctly, if its not sending the ground signal it will hunt around 14.7. Under boost it drops to 12 and in cruise you can watch it hunt from 14.4-15.2, back and forth.
The lookup table for the MAF output is 5X7 or 35 tuning points.
I wanted to tune the maft t using the stock wide band readings from a stock quest.
Since I tuned my car with the settings that Scott provided above it has ran perfectly.
Every car is different and you need to be careful when tuning and boosting.
This is not for installing only tuning.
MAF-T tuning guide download link.
specific car types MAF-T Guides
1st Gen 2nd Gen Eclipse Guide
Tuning the MAF-T
1st select the proper GM MAF sensor your using per the guide.
On the MAF-T you have 5 dials
BASE, AUX, IDLE, MID, WOT,
Once you have the proper setting for the MAF sensor now you have to set the
BASE and AUX settings for your injector size per the Guide.
Take the 2 injectors your using and add them together, Then divide by 4.
650 + 1050 = 1700 CC / 4 = 425
Set the MAF-T to 430 cc injector setting.
Per the 1st GEN MAF-T Guide injector setting section.
The Guide states that the 1st GEN setting BASE 0 – AUX 0 = 430 CC injector settings.
START the CAR
Using the wideband gauge you need to adjust the IDLE dial to get the car to idle at
12.5 to 13.5 on the Wide Band Gauge.
The other dials are set to 0. MID and WOT
Rev the car a few times. Make sure it does not stall.
Drive the car,
Find a road that is not busy. Drive the car at 35 to 40mph.
You want a constant cruising speed. Keep an eye on the WB gauge.
You want the gauge to be around 14.4 to 15.2 during this constant
cruising speed. If it is rich or lean adjust the BASE dial leaner or richer
accordingly. You want the wide band gauge to read 14.4 to 15.2 at a continuous cruising speed.
i have changed gears from 3rd to 5th and maintained the speed at 40 and the gauge read the same.
Once you achieve this with consistency, now you will have to recheck your
Idle and again adjust the IDLE dial so the wideband at idle is 12.5 to 13.5.
Now that your IDLE and Cruise is set, you will start to give the car some light boost.
¼ to mid throttle. Light acceleration not much boost.
As you touch the gas pedal and start to accelerate. The tip in
on the gauge might go rich or lean. Now you adjust the MID DIAL.
Adjust it so that your light acceleration is near 12.5 to 13.0. You will have to
Adjust to see what is best for your cars setup you might need it richer. Once you
can transition from Cruise to light throttle acceleration and it pulls nicely the MID dial
is for when the car transitions to boost. if it bogs here as you go from steady cruise to
light boost the mid dial fixes the rich or lean stumble as you press the gas or tip in.
this is for light throttle. the mid is for when you want to give it a 1/4 or 1/8 of more pedal.
5 PSI or less kind of adjustment.the transition to WOT. dumps a little extra fuel.
Just what it says. Once the car runs good you will full boost the car and
have your co pilot check the gauge. Make sure the wide band gauge
is around 11.3. Adjust the WOT Dial accordingly.
In my opinion the MAF-T is a sloppy tuning tool. Only 5 % increments per click.
Unless you get the RPM signal hooked up then you have 2% increment adjustments.
Read the guide on how to use that.
On a side note I had trouble getting the wideband gauge to read 11.3 to 11.5 on
Wide OPEN Throttle with my car. My car was running 10.4 on my wideband gauge.
If I adjusted the MAF-T WOT DIAL one click lean. The Wide band was reading
12.xx. what I was able to do on my car was adjust the fuel pressure to 41 PSI.
My car has an adjustable fuel pressure regulator. Then I retuned the car and now
was able to get the car to a nice 11.3-11.5 reading on the gauge.
Because my MAF-T is in the engine bay, I had to pull over many times and make
Adjustments to the MAF-T. some tuning steps may need to be repeated. ALSO as
the weather changes you might notice that the car might need to have some adjustments.
Seasonal changes might be necessary.
I hope this helps someone out.
Edited by importwarrior, 14 November 2013 - 09:00 AM.