Setting-up the PCV-AT for mileage and cooling

quiksilver235

New member
I've been wanting to do this for some time, so here it goes. The point of this write-up is to explain how I've configured my PCV with Auto-Tune (PCV-AT) for good gas mileage without taking a hit on performance or cooling. For me one big advantage of the PCV as a tuner option is the ability to easily set-up a map or hardware switch and be able to toggle between two maps. With the basic PCV you can load two distinctly different maps, but this write-up is about setting up the switch with Auto Tune (AT), which is very different in operation. DynoJet calls it a "map switch" for the basic PCV (no-AT) and a "hardware switch" for Auto-Tune. To use Auto-Tune with or without a switch the Map Switch option under Device Tools > Configure must be disabled and to use a switch with Auto-Tune go to the Enable Hardware Switch option under the Auto Tune section and check it. They are two completely different features and you can't use the Map Switch option (two different base maps) with Auto-Tune.

With AT, instead of having two different base maps to choose from you have the option of running the base map in open-loop mode (AT inactive) and that same base map in closed-loop (AT active) using leaner target AFR's. The way I approached it was to create a rich base map for those rare times when you need extra cooling and lean, mileage-optimized Target AFR tables to run on most of the time. Compared to the basic PCV that switches between two different base maps, this effectively accomplishes the same thing when set-up properly, but first let's look at a few fundamentals. The PCV-AT software is divided into three pairs of tables, each representing front and rear cylinders--the base map, target AFR, and trim. There is also one ignition-advance table for both cylinders, but although it it does not auto-tune it retains the bike's on-board knock-sensing capabilities.

Open-loop: No AT, no feedback from the O2 sensors, runs on the base map only. All EFI bikes without O2 sensors
run in open-loop mode.

Closed-loop: AT with feedback from the O2 sensors, writes to the trim tables on the fly.

Base Map: This is the basic map from which the PCV operates.

This is my base map for Cyl. 1. On the x-axis you can see throttle position (TP) and on the y-axis RPM's. If you'll look at 2500 @ 10% TP you'll see a value of "8", which means the PCV is demanding 8% more fuel than the ECM is dictating for that RPM and TP. You have a range of
 
Well written. I have done exactly the same thing. The only differences for my maps is that I use 14.2 AFR where you have the 14.6 since I dont have an oil cooler. The other difference is that I dont use any values in the ignition table except in the abouve 60% range since I have the stock cams.

Good writeup.
 
Dennis, did you set-up your rich base map with 13.5:1 in the cruise range or something different. I was guessing on this, as Fuel Moto typically sets that range to 13.7-13.8 for their maps. I felt like 13.5 would be about right.
 
Good write-up ICLICK....

This will help me out a lot when I throw in the new cams in a couple weeks.
I'm actually going to try a few of your changes in my current map to see how it acts....
 
Keep us posted on your progress. Before making the cam upgrade I had my bike running well at 14.7:1 in the cruise-range, so you might be able to bump it up a bit. But watch oil temps if you don't have a cooler. Where I have it now, 14.5-14.6 works well in my bike with the 255's, and mileage is in the upper end of what people are reporting here.
 
I tried AFRs from 13.5 - 13.8 and ended up leaving it at 13.8. I didn't really see the benefit at 13.5 so I run it at 13.8 now. Got the cooling and saved a little gas. I plan to monitor it on the hotter days this summer.
 
I thought with the auto tune you could set a map for every gear, is this something you can do yourself or a specific option for a dyno tuner. If you can set a map for each gear cant you leave 1st and 2nd maybe 3rd gear rich and lean out you cruising gears. Would this help with fuel mileage also? That is if its even possible.
 
Bob,
Another awesome write up! I am going to be doing my cams when I get back from Laughlin I don't have the auto tune yet but it is in my future and I am tagging into this post. Thanks again for all your input dude.
 
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