Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[FLTRI]

How are you picking up he is not very consistent when looking at a screen shot of 1/3 of a lap?  The track he is on goes from a long straight that is on the high bank oval at about 125, has a big dip as you brake coming off the banking and then the surface gets real bumpy as you brake for a 30 MPH left.  That section of the track is all quite tough to be smooth on the loggers.  The drivers really have their hands and feet full trying to stay off the walls.  And no, he is not new to this stuff.  He is an ex SCCA national champion.  He has no significant sponsors other than his wife.

That car has a data logging dash.  I can ask if he got the logs off of it.  A different guy helps him with the chassis stuff.

Andy

Looks like 3 laps of the same section of data.
Just curious, what's you driver's name? I know a lot of SCCA drivers and national champs.
Bob

[whittlebeast]

Looks like 3 laps of the same section of data.
Just curious, what's you driver's name? I know a lot of SCCA drivers and national champs.
Bob

Chuck Mathis.  I was not involved in those days.

http://www.racer.com/mathis-earns-first-scca-g-production-national-championship/article/141700/

http://www.ncs-stl.com/racecardata/ChuckRaceData.png

http://www.ncs-stl.com/racecardata/ChrisStripChart_05_30_11.jpg

[FLTRI]

Chuck Mathis.  I was not involved in those days.

http://www.racer.com/mathis-earns-first-scca-g-production-national-championship/article/141700/

http://www.ncs-stl.com/racecardata/ChuckRaceData.png

http://www.ncs-stl.com/racecardata/ChrisStripChart_05_30_11.jpg

Is this data from an autocross? (Parking lot with cones)
Without the signal key it's hard to tell what some of the signals are like the dotted line.
I assume the blue line is lat g?

Bob

[whittlebeast]

This is rather cool.

http://www.14point7.com/

Look at the Spartan Lambda Sensor.  Way cool stuff.

AW

[whittlebeast]

Is this data from an autocross? (Parking lot with cones)
Without the signal key it's hard to tell what some of the signals are like the dotted line.
I assume the blue line is lat g?  Bob

Here is data off a rather rapid autocross car.

http://www.ncs-stl.com/racecardata/Gary%20GG.jpg

Andy

Bob, sorry but the Chris plot was an autocross car.  I copied the wrong link....  The Chuck GG link was Chuck Mathis.

[FLTRI]

OK Back to the OP.
Can we agree we can target a specific NBO2 voltage to end up with a variance of 12.8-13.8 WOT AFR?

Bob

[whittlebeast]

OK Back to the OP.
Can we agree we can target a specific NBO2 voltage to end up with a variance of 12.8-13.8 WOT AFR?

Bob

I would never trust that on my bike.  I would trust MAPxRPM vs DC

Andy

[whittlebeast]

Hopefully we can get sam280z to join in this conversation.  Trust me, he is far from a Noob at this sort of thing.

AW

[FLTRI]

I would never trust that on my bike.  I would trust MAPxRPM vs DC

Andy

Please address the OP:
Question:
If a tuner were to put a bike on the dyno and measure WOT AFR with his broadbands and record the voltage from the sensors...can that voltage number be used in reverse to get to the previously measured AFR?

If this is possible to use to get close to a dynoed WOT AFR for those DIYers who do not have the equipment it may provide a way for them to tune WOT after v-tuning to the 83kpa limit.

[whittlebeast]

A NB sensor is way too sensitive to exhaust temp to ever be trusted away from 14.7 AFR.  The answer is no, don't do it.

Andy

[Doc 1]

 

A NB sensor is way too sensitive to exhaust temp to ever be trusted away from 14.7 AFR.  The answer is no, don't do it.

Andy

 

[mayor]

Any word from Mayor as to how his testing is coming?

my testing didn't quite go as planned.  Due to time constraints, I didn't get to try to target a sensor voltage.  The previous mV target trends that was posted on the lambda DBW bikes still seem to be good though, based on the data I collected.  Looks like a safe lambda DBW target voltage at WOT is going to be 1720-1760mV.  I do not think that reported sensor variance at wide open is going to be an issue.  How to get enough data to make informed decisions on the street is going to be the tough part IMO, in addition to having available a library of sensors values for target ranges for various bikes.

OK Back to the OP.
Can we agree we can target a specific NBO2 voltage to end up with a variance of 12.8-13.8 WOT AFR?

I see Andy's point based on the common use of these sensors, but I have yet to see anything in reviewing actual tested data at wide open from HD's to suggest that this can't be done based on the perimeters spelled out in the OP (wide open). 

[hogasm]

What would cause the rear O2 to read 3200mv @ 3000rpm's and the front to only read 1700mv @ same rpm

[FLTRI]

What would cause the front O2 to read 3200mv @ 3000rpm's and the front to only read 1700mv @ same rpm

The front sensor is not on line due to too rich or too lean AFR or dead.
Do you have a data log to view?
Bob

[joe_lyons50023]

Or to cold for some reason.