07 Sert tuning
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Road Captain
Joined: Mar 2006
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From: West Central WI
07 Sert tuning
Well, going to try this again, hope it goes better this time, My question is on the 07 bikes tuning with a SERT, What if any effect do the afr and VE tables have on the total equation for injector pulse width when the new systems are operating in closed loop mode, Or are they mainly there for a backup in case of 02 sensor failure, I guess to simplify my question, would raising the VE table numbers have any affect on the actual AFR(as measured out the pipe) when the system is operating in closed loop or are the bias tables the only way to fatten up the mixture. ANY and ALL relative responses and opinionsappreciated. Thanks!!
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RE: 07 Sert tuning
VE = the air movement through the motor at any given point
AF Table adds fuel based on the # in the VE table to get the mixture you desire
If VE isincorrect and you don't have O2 sensors, final mixture is off
If VE isincorrect and you have O2 sensors, you will see the correction factor in the data.
O2 sensors are only listened to where AF table says 14.6
When AF Table says 14.6, the mixture desired is not 14.6 - it is based on the BIAS voltage
.798 BV = about 14.2 mixture
AF Table adds fuel based on the # in the VE table to get the mixture you desire
If VE isincorrect and you don't have O2 sensors, final mixture is off
If VE isincorrect and you have O2 sensors, you will see the correction factor in the data.
O2 sensors are only listened to where AF table says 14.6
When AF Table says 14.6, the mixture desired is not 14.6 - it is based on the BIAS voltage
.798 BV = about 14.2 mixture
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Road Captain
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From: West Central WI
RE: 07 Sert tuning
So if you were attempting to make the AFR (as measured out the pipe) richer by making VE numbers higher in the closed loop areas of the map it would have no affect? Is that the correct interpretation of your explanation? What would you do if you wantedan actual AFR(as measured out the pipe) lower/richer than the 14.2 afr corrected by the bias tables and 02 sensors.
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RE: 07 Sert tuning
ORIGINAL: BVBOB
So if you were attempting to make the AFR (as measured out the pipe) richer by making VE numbers higher in the closed loop areas of the map it would have no affect?
CORRECT - UNTIL YOU MAXED OUT THE SENSOR AND THREW A CODE
Is that the correct interpretation of your explanation? What would you do if you wantedan actual AFR(as measured out the pipe) lower/richer than the 14.2 afr corrected by the bias tables and 02 sensors.
IF YOU WANT TO GO RICHER, YOU SET THE AF TO 14 OR LOWER - THEN YOUR VE'S NEED TO BE RIGHT ON OR YOU WILL NOT GET WHAT YOU ARE ASKING FOR.
So if you were attempting to make the AFR (as measured out the pipe) richer by making VE numbers higher in the closed loop areas of the map it would have no affect?
CORRECT - UNTIL YOU MAXED OUT THE SENSOR AND THREW A CODE
Is that the correct interpretation of your explanation? What would you do if you wantedan actual AFR(as measured out the pipe) lower/richer than the 14.2 afr corrected by the bias tables and 02 sensors.
IF YOU WANT TO GO RICHER, YOU SET THE AF TO 14 OR LOWER - THEN YOUR VE'S NEED TO BE RIGHT ON OR YOU WILL NOT GET WHAT YOU ARE ASKING FOR.
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Road Captain
Joined: Mar 2006
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From: West Central WI
RE: 07 Sert tuning
Thanks for the replies OSE, I follow you now. What actual afr ratio do you feel is best forcruise range, for example on an 07 Ultra occasionally pulling a trailer, I have always been lead to believe 14.2 or higher would still be consideredtoo lean. In the past I have used the twinscan plus to populate the VE tables (06 Dyna) and have what I feel is an excellent running bike that still gets decent mileage. I have since upgraded to the twinscanII so I can tune both Cylinders at the same time. When I did the 06 Dyna, I started with a map with the afr's 13.2 across the board and removed the factory 02 sensors and replaced with the wideband sensors for populating the VE tables. It did not throw a CEL code as long as my map was kept out of the 14.6 number, I hope I can use this method on the 07, do you see any potential pitfalls.
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