Just bought a Pro and now what?

[NM]

I picked up a Pro 800 and will eventually turbo it, but I want to install a wideband and run it stock for a while. What should I expect for numbers while cruising on the trail, part throttle load in snow, and wide open? What is the fuel/ethanol plug in deal? Does it change timing? Can the det sensor be disabled?

Sorry for all of the questions, but I have been on Yamaha's for the past 5 seasons.

 

[jskattum606]

I picked up a Pro 800 and will eventually turbo it, but I want to install a wideband and run it stock for a while. What should I expect for numbers while cruising on the trail, part throttle load in snow, and wide open? What is the fuel/ethanol plug in deal? Does it change timing? Can the det sensor be disabled?

Sorry for all of the questions, but I have been on Yamaha's for the past 5 seasons.

Ive seen that these motors run pretty lean. On a wide band on the trail should be between 13.5 and 14.5, partial load in snow should be 13-13.5 and wide open should be about 12.5.
As far as i know, the ethanol plug tells the ecm to richen the fuel mixture 5%. No timing adjustments. The only way to disable the DET sensor is to take it off of the head. I wouldnt recommend that.

Please tell me your gonna play with the Boost-it system in the two stroke world

 

[NM]

Ive seen that these motors run pretty lean. On a wide band on the trail should be between 13.5 and 14.5, partial load in snow should be 13-13.5 and wide open should be about 12.5.
As far as i know, the ethanol plug tells the ecm to richen the fuel mixture 5%. No timing adjustments. The only way to disable the DET sensor is to take it off of the head. I wouldnt recommend that.

Please tell me your gonna play with the Boost-it system in the two stroke world

The plan is to play with it on this Pro. Our new fuel controller has fuel trim every 250 rpm from 3000 to 9000 rpm. Between this and the datalogging on the controller I should be able to tune it.

 

[Kestrel2126]

Sounds cool, good luck. Only thing I have to add, is that I believe the Ethanol plug actually richens it by 10%. The det sensor is extremely sensitive on these sleds, but when tuned correctly they are not an issue.

 

[flying frenchman]

Let us know how it works out for you. Seen you sled on another post ,Looks good.

 

[mod03rmk800]

I will see this weekend as one of the guys has the gauge on. Only thing I can for sure say is that he is at 12.2 on multiple heavy climbs. Only mods are clutching(which is working pretty well). "Chip" plugs only adjust the fuel.

 

[NM]

I will see this weekend as one of the guys has the gauge on. Only thing I can for sure say is that he is at 12.2 on multiple heavy climbs. Only mods are clutching(which is working pretty well). "Chip" plugs only adjust the fuel.

I am going to assume that a boosted sled would be in the 11's at wide open then. I know the Yamaha's make the best tourque at 11.4-11.8 under boost.

Because we will be starting with a one off turbo kit, what should we be doing with the sensor that goes in the stock air box? My understanding is that it may be a atmospheric pressure sensor which shouldn't really see positive pressure? If it is a air temp sensor, then it would be better off mounted outside the intercooler so it would not recognize warmer charge temps, but colder ambient air. We are running a pretty nice intercooler with the injectors mounted in the tank.
Once again, sorry for all of the questions.

I have the 4 strokes nailed...but would really like to know more about these 2 smokers.

 

[mod03rmk800]

I am not sure where the sensor is getting moved to, but I would mount under the hood with a bit of pre-filter wrapping it. I run in the low 12's on my Dragon which puts the EGT's in the high 1200's to low 1300's. Any richer and it started falling on it face after 4-5 seconds and plugs fouled quicker of course. Iridiums get spendy.lol I also like swain tech.

 

[R_8_N]

I am going to assume that a boosted sled would be in the 11's at wide open then. I know the Yamaha's make the best tourque at 11.4-11.8 under boost.

Because we will be starting with a one off turbo kit, what should we be doing with the sensor that goes in the stock air box? My understanding is that it may be a atmospheric pressure sensor which shouldn't really see positive pressure? If it is a air temp sensor, then it would be better off mounted outside the intercooler so it would not recognize warmer charge temps, but colder ambient air. We are running a pretty nice intercooler with the injectors mounted in the tank.
Once again, sorry for all of the questions.

I have the 4 strokes nailed...but would really like to know more about these 2 smokers.

on my dragon my A/F is best at 12.5 under full boost on a good pull. runs decent from 12.0 to 12.8. mid to high 13's on the trail but ive been told im still fat there. no sence on running hard on a trail ride imo. the air sensor has been moved to the plastic cover over the electronics above the clutch....just reading air in that area.

 

[Boyko]

I think were you are going to see a challenge is when you start adding fuel, If you raise the threshold to much you will end up with a critical lean condition at specific cruising points. To low and ya get the bog, the window for A/F is tight on a 2-smoker they are not to forgiving.

Dobeck boxes can do a lot of tricks the end user does not see, there is no fuel map in the traditional sense that is programmed into them.

Be forwarned, If you get the pro working you might have a hard time getting back on the Yamahas, good luck with it.

 

[NM]

I think were you are going to see a challenge is when you start adding fuel, If you raise the threshold to much you will end up with a critical lean condition at specific cruising points. To low and ya get the bog, the window for A/F is tight on a 2-smoker they are not to forgiving.

Dobeck boxes can do a lot of tricks the end user does not see, there is no fuel map in the traditional sense that is programmed into them.

Be forwarned, If you get the pro working you might have a hard time getting back on the Yamahas, good luck with it.

Thanks Boyko, this box really does not have a traditional map either, so it adds fuel based on rpm and boost. The cool thing is now we can change the parameters to which it adds fuel in a specific rpm range. I do realize sleds will make different boost levels at different rpm based on load, and this is why being able to tweek fuel in a matter of seconds will be nice for different snow conditions.
I am really hoping that I do not have to do alot of tuning from the base settings. I did not have to change anything on the Nytro aside from changing the base fuel curve setting and threshold. Once I set threshold, i never touched it again in 7 days of riding and the sled is smooth as butter when boost comes on. It makes no difference if you stab the throttle or roll on smooth, it is the same result everytime at any elevation and any snow condition. It is also smooth when chopping on and off throttle, but I am sure this 2 stroke will be a different animal.
I can set the threshold wherever I want with a hard #, so that part should be simple.
I really like my Yamaha's, so this thing would have to be pretty special to make me want to switch full time! We are going to give it our best shot though. I just have to figure out some clutching. I have ordered a set of adjustable Daltons from 77-83 gr and two different clutch springs. I would like to find a straight cut 48 deg helix, but no luck so far.

 

[mod03rmk800]

What is your plan for the skid?

 

[NM]

What is your plan for the skid?

The skid is going to Racers Edge monday to get one of there arms installed. We have to modify the rail tips slightly and add a anti stab kit to allow clearance for the bigger drivers, the 3 inch track, and the Avid chaincase. Should have it on the snow next weekend if all goes well.

This was a skid we put in one of our Nytro's.