I don't know about everyone else but this is how I do it. Fill up with gas, reset trip odometer, drive around, when you fill up again divide your trip mileage by the amount of gallons you put in.

 

Exactly how I do it.

 

Exactly how I do it, too. Sometimes I get around 125 or so miles per tank and sometimes it's 175-180. Mostly, however, it falls between those extremes. That's just the way it happens to be. Pretty normal, I thought. Even when my bike was stock, the gas mileage was all over the place, depending on how I drove.

 

interesting...

 

i installed a thundermax w/ auto tuner a few months ago, although my ride runs better i feel that its not quite right. fuel millage is low and i still get deceleration pop around 2k rpm's. ive thought about getting it dyno tuned. ive heard two sides to getting it tuned: 1) the right tuner can get it mapped out perfect and improve performance and gas millage better then the downloaded maps. 2) there is no need to get it tuned, the thundermax adjust its self for the best performance. im a little confused can anyone help?

 

It just needs some tweaking for the performance you want to achieve. If you want better mileage then it needs to be adjusted in those areas for the type of riding you do. You might try zippers for support.

 

Hey Gents,

First I want to say thanks for all of your great comments regarding your prior experience with the Thundermax AutoTune EFI module, they all lead me to the ultimate decision of making the leap financially.

Now for the results, I have a 2013 HD FXS Blackline w/ a Stage 1 Screaming Eagle Heavy Breather and V&H Big Radius True Dual 2->2 exhaust. Since I've had the bike, its always ran a tad lean and gas mileage has been (on a 5 gl. Tank) 180-ish miles per tank, which is around 36 mpg. I've never had any pinging noises or issues, but the deceleration and acceleration you will hear alot of backfiring from the exhaust.
Now post install, the idle alone is much calmer, and consistent. Once warmered up and taken on her maiden voyagé, the instant increase in torque is scary impressive, and as you ride longer you completely notice the bike modifying its dynamics for even better performance. As you power shift through gears and slam on the throttle, be sure to hold on tight as it wants to leap off the line from every gear.

Simply put, the EFI is a beast and has greatly increased performance. I'm hoping to see better mpg's as the weeks and months progress. I'll keep you all informed!

 

For the new guys, the Thundermax uses wideband sensors and is always tuning your bike for the conditions which you are riding in. The thundermax learns these Air/Fuel set points (A/F) and keeps them in its knowledge center. After you riding your bike for x amount of miles, you can go in a do an Autotune, where your laptop takes the learnt A/F,s for each 100 rpm and % of throttle opening and saves them and writes them back to the bike. Now this is your bikes map that your Thundermax is using. But still, from there, if you drive down to the coast or up to Denver, the Thundermax is always reading and learning and adjusting. It has to be the best dam tuner around in my opinion. Live tuning! No dyno needed.
Now there are little and big tweaks that can be made, but this is best left to a tuning master or a call to or upload to Thundermax. All of this is possible through the software when you hook up to your Thundermax. You can capture you maps and info and send this to the factory with your questions and they will come back to you with the tweaks you need to make. Great support. Great Tuner.
I am installing mine this week on my 2008 CVO Ultra that has had much work done to it and finding a map to match or tune it with a regular Power Commander tuner would be such a hassle, just ask me.
Last thing I wanted to say, is that your normal idle rpm should be about 1050 or so.
This is because of the design of the Harley oil pumps. The new M8 motor has a totally better oil pump and can idle down there at 800 rpm.
But do what works for you.
One note on low idle for the thundermax is that when your bike gets hot, the Thundermax will drop your rpm and add more fuel to cool the engine. This is what they developed for this overheating issue.
If you have a popping issue, you can go in on your laptop and tweak up the setting for this. So from 0, which your probably set up with, go up to 1 and try that.
Youtube has a few good videos to watch, take an evening or two to look at them.
Continue success to you all.
Trev

 

I am looking at this and the Power Vision. Did a search and read a few horror stories of people being left stranded when this thing $%^& the bed. Most carry the stock ECM with them for this reason. My question is, if this happens, will the stock ECM work with the wide-band O2 sensors?

 

I don't believe the Thundermax O2 sensors have the same connector as the OEM but I would program my stock ECU to work in open loop all the time if I were to carry it around as a backup.