Hi All,

 

I use the TTS MasterTune2 on my 883 Iron that has the V&H Big Radius 2-2 and K&N AirCharger fitted.

The intent is to ensure I have the VE and AFR Tables are correct to suit this combination.

I have done a number of Datalogger runs to understand what’s happening with the current fuel map.

I look at the O2 Sensor Voltage and see it a lot around 1,100 mV which is way higher that what the Bias Tables are set to.

This sort of voltage - does it suggest the mixture is rich at that point or lean??

Pete

 

Those voltages are the actual signal strenght that the o2 sensors are sending back to the ECU to tell it what mixtures it has. As Harley run narrowband sensors for feedback they are only accurate across a small range so you need to be careful when using them for tuning.
Cheers- Ant. Hope that answered your q's

G'Day Buznuts,

Thanks for the response. Yea, I have now got my head around what the O2 Sensors provide and tells the ECM what's going on with the AFR.
Now what's shitting me is working out what I need to do with my Bias numbers. At the moment I have both the Front & Rear the same at 540mV.
Now I need to work out is if that is a good number or I need to Richen or Lean it out for best results.

I have tried +/- a few hundred and can feel the difference in the pants but don't know how far off the mark I am.

Any ideas on how to approach this??

Pete

I have run closed loop bias @ 720 across the board for all my maps, but on another forum I frequent, a few of the guys are @ 681. I've attached a link to the thread I'm referring to. It is quite long if you read it from the first page, but very informative, There is quite a bit of information on this forum from a few years back on TTS also. - Rob

http://www.hdforums.com/forum/ignition-tuner-ecm-fuel-injection/302165-tts-mastertune-information.html

G'Day Rob,

Thanks for the link - have seen this a few weeks back but never digested it - I will definitely look at this and study.

As you have stated, you run 720 while others use 681 which is only 39mV between the two. So we are only talking small numbers.
As I have a 2013 883 Iron, these values are of no use to me.
How did you come up with 720 Rob? Did you run DataMaster a few times to get your numbers or is there a better way to do things?

I'm off to take a look at the link :-)

Pete

720 was a number that was trialled by several TTS users on this forum some years back, so I just stuck with it. Might try a lower setting next time I VTune. To me it is a good compromise between mileage & cool running but when you start going too high with the close loop bias (particularly above 780) it shortens the o2 sensor life quite considerably I believe. In the manual, it explains how to adjust the bias tables & also the effect the numbers have on the running engine. It's trial & error for this table, lower number = mileage, higher = cooling.
Might pay to do a search on this forum for the TTS threads in this section, especially from ozrodder (RIP) as he, Hilly & a few others were very good with their information & tips regarding TTS.
I still believe it is the best system for the DYI rider, because you can either leave all the tables as they are & have a really good running bike, or you can play with the tables, EGR, timing, closed loop bias etc & have an awesome running bike. A dyno tune with TTS should be better still. - Rob.

G'Day Rob,

How did the Friday treat you..... all good over here. Went down to The Lions Football Club (AFL) after work to have a few Pints. Looking forward to the NRL season and I see you guys are look'n good for this season.

Thanks for the post - I have discovered an area where I had been stuffing up, I had been doing Data runs then adjusting the CLB to a value instead of the other way around.

I have basically gone back to square one and gone back to the generic calibration that comes with TTT. It's CLB had been set to 600mV so I have gone a tad richer to 620mV.

I will do a few data runs tomorrow and re-develop the VE Tables.

Fritzables.

G'Day Rob,

How did the Friday treat you..... all good over here. Went down to The Lions Football Club (AFL) after work to have a few Pints. Looking forward to the NRL season and I see you guys are look'n good for this season.

Thanks for the post - I have discovered an area where I had been stuffing up, I had been doing Data runs then adjusting the CLB to a value instead of the other way around.

I have basically gone back to square one and gone back to the generic calibration that comes with TTT. It's CLB had been set to 600mV so I have gone a tad richer to 620mV.

I will do a few data runs tomorrow and re-develop the VE Tables.

Fritzables.