Been doing some tweaking on the TMax. I bumped the timing at high RPM/WOT back a few degrees.

But, the real news is the drivability, responsiveness, and fuel mileage! I changed the map and bumped the cruise A/F up to about 14.3 (from 1,280-3,584 RPM, and only between 20 to 28 degrees of throttle position. It took a little tweaking of the ramps before and after, but it now transitions pretty well, has some good power, and on my last fill-up, it worked out to around 41 mpg. Now we're getting somewhere. It's likely not perfect, but it works much better for me than the canned tune #642.

Here's a screen capture of the basic A/F ratio. Idle is set around 13,5 and then these maps take it from there once the RPM rises. They are not all identical, but very much the same between 1,280 and 3,584 RPM. You can see I even added some fuel at WOT. The yellow dots are the original "canned" tune from #642, so you can see how much I altered the fuel map. Transition is nice from idle through all RPM ranges, no popping, and nice power. A small twist of the throttle makes a difference you can feel!





Interestingly, I checked a few of the tunes for an 88ci with the 8-degree injectors and they all had the same numbers for A/F. It didn't matter whether it was for a Road King or a Dyna, stock head pipe or true duals. Either way, the timing and A/F changes are definitely working for me. Just thought I'd share the info -- for posterity and all. =)

 

So what kind of fuel milage are you getting now?

 

My last fill-up yesterday AM showed 41 miles per gallon as figured on my calculator. I usually check with each fill-up to get an idea of the average, so we'll see how it plays out long-term. Of course, I did a little bit of wrist-twisting this time around to make sure everything was happy.

 

How much is a used Tmax worth? It's an older one 309-340 with A/T 309-350. It worked fine but I went with a Power Vision to have multiple maps for my new engine.

 

Luckily I don't think they marry to the bike so they can be re-used. I would think around $250-300.

 

Agreed. You install the VIN, but that can be changed out through the software. While it may not retain the warranty due to its age (and possibly only for the original purchaser) it is my understanding that it can be used on another bike, so long as it fits that application. That is why I decided to go with it in my 2006 Road King. If I sell the bike, I can keep it to use in another bike and put the OEM ECU with a Stage 1 tune back in the bike. I'd think $600 would be ringing the bell on a used TMax, but if you can get it, go for it! Likely $450-$500 would be more like it. IMHO. Good luck!

 

I got a great deal on mine $625. new. I was thinking about $300. used. I was just wondering if it was fair. I don't want to go too low. It did work fine when I took it off.

 

The last Gen II unit I sold, I sold for $250 plus shipping. I've bought a few used for between 200 and 300. If the O2 sensors are beat up, you end up blowing $100 for a pair of new ones.

 

The O2's are fine. I'll post it for 300 and go down to 250. thanks.

 

Thanks for the clarification Max!