Does anyone know what this is??? - Suzuki Z400 Forum : Z400 Forums
 
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Old Yesterday, 11:33 AM Thread Starter
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Does anyone know what this is???

This is an FMF power programmer that customer service says was made by dynojet. It was plugged onto the battery of my 2012 ltz400 EFI but the pigtails were just looped and wasn't plugged into anything tucked under the tank, and I was gullible enough to believe the guy when he said it was "tuned already" when I bought it and I never actually looked at the pigtail ends to make sure its plugged into the injector. What can I do with this? I have no idea what it's for or IF it really fits this bike, etc etc. Help!
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Old Today, 12:58 AM
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Originally Posted by Blinsenb View Post
This is an FMF power programmer that customer service says was made by dynojet. It was plugged onto the battery of my 2012 ltz400 EFI but the pigtails were just looped and wasn't plugged into anything tucked under the tank, and I was gullible enough to believe the guy when he said it was "tuned already" when I bought it and I never actually looked at the pigtail ends to make sure its plugged into the injector. What can I do with this? I have no idea what it's for or IF it really fits this bike, etc etc. Help!
It's definitely not working, if it's not plugged in. My guess is someone else didn't know what to do with it either. Your best bet is to look up instructions for it, or call the company and inquire. With simple mods like a pipe, they may have settings available that would have it close.

This type of tuner is not super accurate. It will get it running about as well as a carburetor. It's fine for many people. I'm not dogging on it. However, if you want to tune it with accuracy, a Power commander 5 tuned on a dyno costs more, but will be perfect.
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Old Today, 01:11 AM Thread Starter
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Totally cool with buying one of those, I have lid off with K&N and a slip on fmf Q4 and plan to buy a new exhaust at some point anyway, so I know I could use a tuner. But definitely no access to a dyno. So maybe auto tune is the best option?
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Old Today, 12:15 PM
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Autotune is definitely helpful. I wouldn't say it's perfect, but it will steer you in the right direction. I have a dyno, and I tune these, and I can explain a couple of the challenges of these.

So with 1 cylinder, pulling from 1 throttle, it's important to understand that the flow through the intake is not smooth, it's in very dramatic pulses. There are pressure waves traveling through the intake, kind of like when you slap your hand over the end of a pipe. You hear a tone, and you can feel it with your hand. That energy is happening in the intake, but at a far greater energy.

The length of the intake, cam timing, and even the exhaust system, all manipulate those pressure waves.


A carburetor "feels" these waves, and somewhat adjusts accordingly, but they throw it off also, because the carb doesn't care which way the air is going through it, it gets fuel mixed either way. This is why carbs are not real accurate, and if you look at a dyno sheet, you see the A/F ratio bouncing all over the place. Ideally, it stays within a certain range and is called good enough.


With this efi system, you get the opportunity to account for this, but it makes tuning them kind of tricky. That 3 button controller you have will not account for that effect. It will get as close as a carb, but no closer. A power commander 5 has a map. The ECM has a map, much like it that is operates off of. At each throttle position, and each RPM, it knows to inject X amount of fuel. The map in the ECM can't be changed, but it will always do the same thing, and will account for temp and barometric pressure differences.

The values in the PC5 map, are a reflection of the percentage of fuel that it will add or take away from what the ECM is injecting. So it's important to keep in mind that the numbers on the PC5 map do not show how much fuel is given, but how much it's manipulating things.


The autotune will record while you ride, and it will come up with recommendations for changes to make. If I remember right, it won't kick in until a certain rpm, because reversion, and over scavenging can affect it's readings. So you're on your own for the range that it doesn't reach. However, after accepting it's changes a few times, it should have things pretty spot on. You should see much smaller differences being made.

One thing to watch for is known as "yoyoing". If you get into a part of the map where there are big swings in what is going on, the autotune can be tricked, and it may overreact rich lean rich lean, until it gets back in line. So if you see huge swings in your map, you may want to smooth them.


All of that said, you can double check all of this with a wide band, which is handy anyway for the range that the auto tune doesn't reach. In the end, you will have a far better tune than a carb or 3 button tuner could ever hope for. As an added bonus, you can tune for any future mods that you decide to do.
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