MSefi.com read only forum (Jan.15,2018)

I am in the tuning process and have the motor starting easily, idling and driving acceptably but I need to clear up a few things to feel I really understand how MS2 and Tunerstudio really work. What does TunerStudio/Autotune actually use to tune and operate the ECU? There are the settings such as Fuel Required. There are the tables, Timing table (I set this per Honda Manual) A/F table (I used best guess) and VE table (I used autotune)?
Question 1. Does MS2 only reference the A/F table to operate, which means the O2 sensor is only there to observe?

I going to stop here hoping someone can verify if what I think is correct. Please don't refer me to the massive amount of explanations on the web. I read and reread them many times. I would like to know exactly what occurs not a theory of operation.
Thanks.

The MS uses the req_fuel and VE table, modified by the various correction factors, to calculate the PW. When Autotune or VEAL is engaged, the AFR table is compared with the signal from the WBO2 sensor to update the VE table.

I work with a bunch of carburetor guys that build drag race VW's and muscle cars. They all sense my motor is running rich. I believe this is true and the NBO2 sensor agrees. Since this is not at all a race car I have not invested in a WBO2. To lean things out do I modify the A/F table or the req_fuel setting? I should note that this is a kluge of parts never intended to go together. The engine/car is an air cooled Honda N600, the coil is from a GM waste spark system and the TB is from a Geo Metro.
Thanks for the information. I now have a clearer picture of what is actually occurring.

708803 wrote:I work with a bunch of carburetor guys that build drag race VW's and muscle cars. They all sense my motor is running rich. I believe this is true and the NBO2 sensor agrees. Since this is not at all a race car I have not invested in a WBO2.

Spartan WBO2 Sensor with Integrated Controller - $105

Unless you're absolutely positive you're pig rich over the entire range, leave the req_fuel alone. Adjust the VE table.

DonTZ125 wrote:

708803 wrote:I work with a bunch of carburetor guys that build drag race VW's and muscle cars. They all sense my motor is running rich. I believe this is true and the NBO2 sensor agrees. Since this is not at all a race car I have not invested in a WBO2.

[urlhttp://www.14point7.com/products/spartan-lambda-sensor]Spartan WBO2 Sensor with Integrated Controller - $105[/url]

Unless you're absolutely positive you're pig rich over the entire range, leave the req_fuel alone. Adjust the VE table.

I am a bit confused again. Shouldn't I adjust the A/F table and let "autotune" adjust the VE?

I know that your question is intended for Don, but I would point out that your lack of a WB controller pretty much precludes the ability to tune with VEAL (auto tune).

Ken

EDIT: Here is the link Don posted.... Spartan WBO2 Sensor with Integrated Controller - $105`]

You set the AFR to what you want, according to your driving pattern and desired power and response. The VEAL and/or autotune will adjust the VE table according to the difference between the specified AFR table and the received AFR signal from the WBO2 sensor. As Ken said, no WB, no AFR signal. You CANNOT tune to any AFR other than 14.7 with an NB sensor.

DonTZ125 wrote:You set the AFR to what you want, according to your driving pattern and desired power and response. The VEAL and/or autotune will adjust the VE table according to the difference between the specified AFR table and the received AFR signal from the WBO2 sensor. As Ken said, no WB, no AFR signal. You CANNOT tune to any AFR other than 14.7 with an NB sensor.

Maybe I am way over thinking this but if I set a specific cell to 14.0 to 1 in the A/F table and my WBO2 reads 14.4 at that MAP-RPM driving condition and modifies the VE table; wouldn't be better to change the A/F cell itself?

Could you also direct me to a wiring diagram for WBO2 sensor.

You set the AFR to what you want; the VEAL will adjust the VE table so the WBO2 signal matches the desired AFR. In this case, a return of 14.4 signal vs 14.0 setting means the fuelling is a bit lean at that point, so the software will increase the corresponding VE slightly.

DonTZ125 wrote:You set the AFR to what you want; the VEAL will adjust the VE table so the WBO2 signal matches the desired AFR. In this case, a return of 14.4 signal vs 14.0 setting means the fuelling is a bit lean at that point, so the software will increase the corresponding VE slightly.

Got it!! I was misinterpreting "the difference". Thanks for your patience. You guys also forced me to read up on WBO2 sensors. I did not know they gave an actual read out. I thought the just had a wider/precise range.

Thanks for the assistance.

I am guessing I can't grab a wide band off a newer Toyota from a Pick a Part. It would not have a built in controller.

708803 wrote:I am guessing I can't grab a wide band off a newer Toyota from a Pick a Part. It would not have a built in controller.

No, but it might interface to an aftermarket one.