Some very odd behavior from the Super Charger??

[christopher]

Been too busy to post these comments from the Togwotee Forum ride a couple weeks ago, but looking for some 2nd opinions.

Nytrocity ran STRONG on Friday and Saturday under all conditions and exhibited no bad behavior at all.

Then on Sunday during a smallish hill climb the engine shut down in the middle of the climb and the sledd tumbled down the hillside. Key was ON, kill switch was UP, and she started after a couple of trys.

Made several much larger/longer pulls with no problem in the next half hour.

half an hour later while going over a series of large rolling hillsides the engine started to "Bog Down", it would loose power on nearly any uphill run, regardless of how steep it was. To the point that the engine would stall or be VERY hard to keep at idle. Then, when I would get on flat or downhill it would roar back to life again. This went on for a good hour or so of riding.

It felt like it was starving for fuel. Push the throttle and it had nothing to give you.

Monday rode it again with MotoPyscho and his first thought was that the clutch wasn't shifting down, so we opened it up and took a long look at that it it didn't seem to be the problem. It never bogged down on Monday, rode reasonably strong all day, but there were points on every climb where the engine would absolutely "miss" or drop out for a moment here and there.

Like one of the fuel injectors would just "turn off" for a moment and the sled would loose power then come right back a second later. He thinks I have a fuel mapping problem..


Also.
Nytrocity has one REALLY odd behavior since I installed the SuperCharger.

The engine shuts off 100% of the time after appx. 6 seconds of running.!

If you start the engine and let it idle, it will die at 6 seconds on your watch.
Then if you restart it, it will hold idle and be fine.

If you start it and hit the gas, the engine will die at 6 seconds and then come right back to full strength a moment later.

This happens 100% of the time with no exceptions at all.

=======

THOUGHTS???


I am wondering if I got some water in my fuel saturday night?
I have added a bottle of HEAT to the tank on the small chance that it was something that easy, but have not had the sled out since then to test this.

 

[CANDYMAN]

Been too busy to post these comments from the Togwotee Forum ride a couple weeks ago, but looking for some 2nd opinions.

Nytrocity ran STRONG on Friday and Saturday under all conditions and exhibited no bad behavior at all.

Then on Sunday during a smallish hill climb the engine shut down in the middle of the climb and the sledd tumbled down the hillside. Key was ON, kill switch was UP, and she started after a couple of trys.

Made several much larger/longer pulls with no problem in the next half hour.

half an hour later while going over a series of large rolling hillsides the engine started to "Bog Down", it would loose power on nearly any uphill run, regardless of how steep it was. To the point that the engine would stall or be VERY hard to keep at idle. Then, when I would get on flat or downhill it would roar back to life again. This went on for a good hour or so of riding.

It felt like it was starving for fuel. Push the throttle and it had nothing to give you.

Monday rode it again with MotoPyscho and his first thought was that the clutch wasn't shifting down, so we opened it up and took a long look at that it it didn't seem to be the problem. It never bogged down on Monday, rode reasonably strong all day, but there were points on every climb where the engine would absolutely "miss" or drop out for a moment here and there.

Like one of the fuel injectors would just "turn off" for a moment and the sled would loose power then come right back a second later. He thinks I have a fuel mapping problem..


Also.
Nytrocity has one REALLY odd behavior since I installed the SuperCharger.

The engine shuts off 100% of the time after appx. 6 seconds of running.!

If you start the engine and let it idle, it will die at 6 seconds on your watch.
Then if you restart it, it will hold idle and be fine.

If you start it and hit the gas, the engine will die at 6 seconds and then come right back to full strength a moment later.

This happens 100% of the time with no exceptions at all.

=======

THOUGHTS???


I am wondering if I got some water in my fuel saturday night?
I have added a bottle of HEAT to the tank on the small chance that it was something that easy, but have not had the sled out since then to test this.

Try unplugging the GEMS controller from the factory harness and put back to stock. If it starts and idles fine, then you know it is the fuel controller.

This only takes a few minutes to do and will determine if it is the fuel box. When we used Dobeck boxes on our Yamaha's we wouldn't leave the parking lot without a spare.

 

[towerrigger]

Also.
Nytrocity has one REALLY odd behavior since I installed the SuperCharger.

The engine shuts off 100% of the time after appx. 6 seconds of running.!

If you start the engine and let it idle, it will die at 6 seconds on your watch.
Then if you restart it, it will hold idle and be fine.

If you start it and hit the gas, the engine will die at 6 seconds and then come right back to full strength a moment later.

This happens 100% of the time with no exceptions at all.

=======

THOUGHTS???

My sled with the PC3 has done this as well right after installing it. Only when the sled is cold, first thing in morning or after it has been sitting for an hour or so. Pretty much any nytro I have seen with an aftermarket fuel controller does this.

 

[←snow∞motion→]

Keep the GEMS box dry, does crazy things when "moist"

Or better yet ditch the GEMS and get a BOOOOOST-IT!!

 

[motojunkie101]

If you read back a few years, there has been historic issues with the MPI fuel controller. I thought they had the issues ironed out...but maybe not.

This is probably a dumb question, but did you put electric grease on all the connections? After that I would see if you can get your hands on another box to see if it works. I would be willing to bet that you had some moisture in there someplace, and it could just need to be sealed up better.

 

[BOOSTD]

A few things going on that I will give my .02

First, I believe your gems box may be going out or is out. Like others have said, unhook and plug in stock throttle bodies and see if it runs better. More than likely moisture got in the box between rides and giving you fits.

Secondly, the whole shut down after 6 seconds is ridiculous. Ive had a few of the units we have built do the same and MPI will not address it. They say its normal and nothing they can do was what I was told, however no other turbo kit I use seems to have that issue but hey what do I know. They know its an issue, its been reported multiple times by more than one person but yet nothing can be done from what I gather. We were told to "deal" with it so we did and the guy sold his sled.

 

[hotmail]

Try unplugging the GEMS controller from the factory harness and put back to stock. If it starts and idles fine, then you know it is the fuel controller.

This only takes a few minutes to do and will determine if it is the fuel box. When we used Dobeck boxes on our Yamaha's we wouldn't leave the parking lot without a spare.

these boxes suck you should change to boost it

 

[BigFish BC]

these boxes suck you should change to boost it

does the sled have a fuel filter & did you put a new tank on with your build if so check the filter.

 

[apex jeff]

Don't know what your particular problem is Chris, all I know is my push kit has 2300 boosted miles and no problem with the fuel controller?

 

[judger101]

that boggles my head that they can say that that is normal and customers have to deal with it? crazy.

 

[christopher]

If you read back a few years, there has been historic issues with the MPI fuel controller. I thought they had the issues ironed out...but maybe not.

This is probably a dumb question, but did you put electric grease on all the connections? After that I would see if you can get your hands on another box to see if it works. I would be willing to bet that you had some moisture in there someplace, and it could just need to be sealed up better.

This has happened from the moment I installed in IN MY GARAGE before the sled ever saw snow. So its absolutely NOT a moisture issue.

 

[christopher]

Keep the GEMS box dry, does crazy things when "moist"

Or better yet ditch the GEMS and get a BOOOOOST-IT!!

Is this what your talking about??
http://boost-it.ca/products/mcx-boost-it-kit/

 

[←snow∞motion→]

Is this what your talking about??
http://boost-it.ca/products/mcx-boost-it-kit/

Yep but get the one for a super charger.

 

[motojunkie101]

This has happened from the moment I installed in IN MY GARAGE before the sled ever saw snow. So its absolutely NOT a moisture issue.

I was referring to the change in how it is running due to getting moisture in it rather than it dying on you after 6 seconds. That part I have no clue...it could be a fault in the controller, or the sled isn't seeing a certain signal and is shutting down...who knows? The older GEMS controllers would bog off the start if you didn't let it run for a few seconds to initialize. This sounds like the controller initializes and then shuts off or something along those lines. Anyhow, I figured you use electric grease since this isn't your first rodeo (never hurts to ask though). Your controller wouldn't be the first to fail because it got some moisture in it. If I remember right, most guys were taking extra measures to make sure they kept the water out and had some success with making them last awhile longer.


I know MPI has some folks here on the forum...hopefully they will chime in.

 

[christopher]

Looks like we are narrowing down the DIE at 6 seconds issue.

For the first 6 seconds of operation the GEMS controller is NOT active.
While the lights on the controller are still flashing back and forth, the GEMS is in standby waiting to take control from the main ECU. Just after the 6 second mark the GEMS turns on and seizes control.

That transitional moment appears to be when my sled is dieing.

 

[mattymac]

Looks like we are narrowing down the DIE at 6 seconds issue.

For the first 6 seconds of operation the GEMS controller is NOT active.
While the lights on the controller are still flashing back and forth, the GEMS is in standby waiting to take control from the main ECU. Just after the 6 second mark the GEMS turns on and seizes control.

That transitional moment appears to be when my sled is dieing.

so then why does it only do it the first time? Sounds like it should do it everytime?

I do know that the yamaha factory ecu's have a specific warm up fueling (and possibly timing) map, but im gunna bet it runs longer than 6 seconds before switching to the "motor warm" fueling map.

 

[bdoe22]

gems

two of the empty "pins" on the gems harness were not plugged on my MPI controller, sled started acting goofy after being literally submerged in powder for days on end....turns out water was running down the steering column area right onto the harness plug and it was FULL of water....called MPI and they said no way...i said check the ones on your shelf....turns out 2 out of the 10 they had didnt have the plugs in the empty pins and the others did....then they said "we dont handle any warranty claims on the gems" so off to doebock (sp) and who knows how long its gonna be.....

 

[christopher]

When talking to MPI last night WATER was his #1 concern.
He gave me a list of connections to check to be sure they are DRY, Sealed and lubricated with the elctroconductive grease.

 

[acutah]

My MPI Apex would stall much of the time after about 6 seconds too. If I would slightly crack the throttle it would almost die but not quite. It was kind of like when put a 2 stroke in reverse. I was told that this was the time when Yamaha ecu handed the ball off to MPI. Also if you take off prior to the hand off your sled will run like crap.

 

[christopher]

MPI just asked me to remove the GEMs controller and see if the engine runs without stopping.

heading down to pull the plug on it.