Does anyone here in the dyna forum know enough about powervision settings to tell me how to run a richer mix yey maintain the closed loop calibration?

I was told to try tricking the ecm into thinking I had a bigger bore than it does but I don't know what value I should be useing.

I was also told to trick the ecm by changeing the injector size so it will work harder to deliver fuel to the chamber, but again which value will most likely work with no adverse effects?

 

Wow so... nobody huh?

 

I'm not familiar with the Power Vision, nor am I an expert on EFI tuning, but if you can edit your Closed Loop Bias table, you can modify the AFR across closed loop operation. Raising the CLB will richen the mix.

 

Thanks man, I waited like 40 minutes on hold yesterday and got a tek from dynojet to talk me through some stuff. He actually took control of my computer and showed me some things, including the CLB. He explained quite a few things and made a bunch of tweaks. I haven't gone out to really try it yet but so far it feels like a race horse busting out of the gate at meadowlands!

Those other two meathods were actually dis- reccomended by him, and he said he would be having a conversation with the guy about that.

I appreciate your help!

 

I have a power vision but haven't messed eith it much yet. Just got it yesterday. Can you tell us what the tech did tell you to do?

 

I wish man. The whole EFI tuning strategy is incredibly complexe. There is no easy answer to engine knock or AFR, VE tables and so on and how they all have to be balanced. People take courses to be able to get a good grasp of the situation, or learn it all hands on, but it takes time.

First you need to start datalogging and you will likely have to make some calls and it took me hours of reading stuff and playing with the PV and it's respective software, just to start logging. Below is a link to a guide which is pretty much the same as the one on fuelmoto's website.

https://www.box.com/shared/i66qvn4xf1s2xp7fgy8v

 

Raising the closed loop bias will only make a very tiny difference. 45o mv represents 14.68 closed loop afr. The highest 02 mv youre stock sensors will read is 798, which represents 14.25 afr. So, yes, it will work, but only to that limit.

 

Yes he explained that but he made adjustments on several tables including VE front and rear, the actual afr table, and the spark timing tables,and so far it is like he worked some majic on in htose 20 minutes he spent on the phone with me. i'm going out to ride soon and try it out of town and I will then check my plugs. If I get no knocking or hesitation and the plugs look good My datalogging for this setup will be pretty much a thing of the past. My fuel tables were already spot on with a maximum difference of 2% in one single cell. There really should be a how to book written for us noobs on how to understand what to do with the information the PV offers us--- But I suppose that is why people go to school for months to understand this stuff!

By the time you pay for the course and spend the time studying you could have bought a set of carbs and been done with the whole thing, but thats not a soloution, FI is the future!

 

Fuelmoto sets closed loop bias at 700 across the board.

 

CLB is one of the messiest tables to play with because of the narrowband O2 sensors in use.

You tend to want to run the values as high as you can (about 800mV) to richen to 14.25 or so and yet this is just where the bias is going to start making the sensors' readings inaccurate. There is is also the chance of reducing the life of the sensors if you run them outside their tolerance.

The relationship between bias and AFR is also very non-linear. All the adjustment is up near the 800 limit:

450 - 14.68
730 - 14.62
761 - 14.53
786 - 14.39
799 - 14.24

So, even with a bias of 700 suggested by someone above, you have only made a change in AFR from about 14.68 to 14.63. Barely noticeable.

I run my bike at 780, which is about 14.4. But I know some people just stick it at the max of 800.

But does it matter? There is no point in throwing fuel at the bike when you don't need it. Closed loop is when you are cruising and gently accelerating so higher performance isn't needed.

Rather than getting too hung up on the CLB tables its more useful to take the first two and last row (1000 & 1125 & 4000 rpm) of the AFR table that are currently in closed loop out of closed loop and put some values around 13.8 in there. This will reduce the idle/low-speed engine temp much better than you can achieve with the CLB tables and will also give you a performance boost at a lower RPM than before.