2016 viper trail turbo dyno results

[Studroes144]

Dyno results from a 2016 w/ mpi trail turbo. any chance they're programming them differently for the 2016 engines?

 

[cannondale27]

Well haven't heard any complaints of kickbacks or any rough idles but what do you see different in the results?

 

[Studroes144]

This one shown on the sheet is 10-12 hp down from some other trail turbos that have been dynoed, I know the poor muffler design robs power but curious why there so much difference from sled to sled.

 

[Joe ltx-le]

This one shown on the sheet is 10-12 hp down from some other trail turbos that have been dynoed, I know the poor muffler design robs power but curious why there so much difference from sled to sled.

Is this the stock gems settings?

If so I was told by mpi that yamaha had them program the gems very rich.
This is just what I was told.
For experience my sled does not feel like 190 hp. It's very close to an apex, maybe 10 hp more. Hopefully ulmers pcv upgrade will help this year.

 

[Joe ltx-le]

This one shown on the sheet is 10-12 hp down from some other trail turbos that have been dynoed, I know the poor muffler design robs power but curious why there so much difference from sled to sled.

Is this the stock gems settings?

If so I was told by mpi that yamaha had them program the gems very rich.
This is just what I was told.
For experience my sled does not feel like 190 hp. It's very close to an apex, maybe 10 hp more. Hopefully ulmers pcv upgrade will help this year.

 

[Studroes144]

Is this the stock gems settings?

If so I was told by mpi that yamaha had them program the gems very rich.
This is just what I was told.
For experience my sled does not feel like 190 hp. It's very close to an apex, maybe 10 hp more. Hopefully ulmers pcv upgrade will help this year.

To my knowledge all settings are stock. It was at 12.1 afr at wide open, maybe a tad richer in the mid rpm range but nothing crazy. I know that since I had the different exhaust done and the pc5 it's a whole different machine. With the quiet muffler and gems controller most I ever went to was 7 psi. Now with the 2.5" exhaust and pc5 even at just 8 psi its way more responsive and pulls much harder up top.

 

[Joe ltx-le]

Great! hopefully this is will be my last engine upgrade for a couple years. It would be nice to spend some time ( money) on getting the ltx to transfer better and get the skis lightend up a bit. It's got way to much ski pressure.

 

[Joe ltx-le]

To my knowledge all settings are stock. It was at 12.1 afr at wide open, maybe a tad richer in the mid rpm range but nothing crazy. I know that since I had the different exhaust done and the pc5 it's a whole different machine. With the quiet muffler and gems controller most I ever went to was 7 psi. Now with the 2.5" exhaust and pc5 even at just 8 psi its way more responsive and pulls much harder up top.

My 16 wouldn't get any better then 12 afr at w/o. Like you say that's safe and not far off. The big problem is cruising mid rang. I was running mid 9s afr.

 

[Studroes144]

My 16 wouldn't get any better then 12 afr at w/o. Like you say that's safe and not far off. The big problem is cruising mid rang. I was running mid 9s afr.

Ya that is extremely rich for cruising speeds. With the taller gearing mine will at 60-70 mph and only build maybe 1 psi, so no need at all for it to be rich when cruising like that. With ulmers pc5 map mine cruises right around 12.5-13. Wot is still a bit rich so will more than likely lean that out a little more but all dialed in right it is a very efficient setup, just gotta get it to that point.

 

[Yamadog]

My stage 1 was like that when it was first built and would not brake 8 mpg when others with leaner maps were getting 12 and 13 running just as hard

 

[Joe ltx-le]

My stage 1 was like that when it was first built and would not brake 8 mpg when others with leaner maps were getting 12 and 13 running just as hard

That's good to know. I've gotta wait and see now.
Sitting at the camp ground drinking beer sounds great but I'd rather be drinking a frozen pop on the side of the trail.