Early dyno reports (850R)

[max rolph]

Example of one of my Data LogsView attachment 173964

Why is you CLP at 124.8, this indicates you need your tune adjusted.... for a perfect tune, the closed loop should only have to make minimal changes. in my eyes you should richen it up on the tune and have the CLFM change allot less.... just a thought for you.

 

[Confused]

Enjoy your stock sled. They're plenty fast. But, getting a tune is night & day. The Speedo digits flip past so fast, it's basically a blur. And obviously more work to maintain, as everything needs to be gone over twice vs stock. jmho....but the work is worth it.

Yes, I'm happy with it right now. I bought an extended warranty so stock is fine. If I'm unable to score a '25 SRX, I'll start dumping money into the '21.

 

[sideshowBob]

Why is you CLP at 124.8, this indicates you need your tune adjusted.... for a perfect tune, the closed loop should only have to make minimal changes. in my eyes you should richen it up on the tune and have the CLFM change allot less.... just a thought for you.

I think I, and others, have badly hijacked this thread....most of the guys data logging the big tunes in the colder weather are seeing the closed loop adding additional fuel at full throttle. I think with the headers, big free flowing mufflers, intake mods ect these sleds are making bigger power in the colder weather, more then the fuel systems are able to respond to with stock regulator hence I am adding an adjustable fuel regulator to bump up the fuel pressure. When just cruising the trails the data logging indicates fuel being pulled most of the time.

 

[max rolph]

The CL multiplier will only add or subtract fuel to achieve the desired preset AFR at any given tps position/rpm, the adjustable fuel regulator will help a little but your injectors will only flow a max amount of fuel based on the pulse width.... for it to be adding that much fuel from what the tune is saying means the tune is set to lean in that area of the map and the auto tune is trying to tell the injectors to stay open longer to reach the afr dictated.... you would much rather have fuel pulled then added... or not being able to add enough.... thats when bad happens.lol

 

[NYTurbo]

May not be the tune , could be a fuel delivery issue. Also the closed loop as far as I know will only add 125 percent so your at its max .

What AFR were u targeting ?

 

[Turboflash]

Or going downhill on railroad grade or road?

 

[sideshowBob]

Or going downhill on railroad grade or road?

That data log was on the flat groomed trail on the lake and those speeds are being achieved with a 141 x 1 3/4" track!
The sled is obviously making big power and actually data logs as high as 20 lbs boost at times.

 

[sideshowBob]

May not be the tune , could be a fuel delivery issue. Also the closed loop as far as I know will only add 125 percent so your at its max .

What AFR were u targeting ?

I also don't think its a tune issue, or the Closed Loop would not be adding so much fuel, and I agree the sled is having trouble supplying enough fuel for the Tunes target AFR.
Looking for a target AFR in the mid to high 11s

 

[NYTurbo]

U have to set your target . Do you have the stock pump still ?

 

[earthling]

The CL multiplier will only add or subtract fuel to achieve the desired preset AFR at any given tps position/rpm, the adjustable fuel regulator will help a little but your injectors will only flow a max amount of fuel based on the pulse width.... for it to be adding that much fuel from what the tune is saying means the tune is set to lean in that area of the map and the auto tune is trying to tell the injectors to stay open longer to reach the afr dictated.... you would much rather have fuel pulled then added... or not being able to add enough.... thats when bad happens.lol

I doubt its the tune . MAP sensor ? The actual AFR in any case is too lean. The injectors are getting there as they are adding tons of fuel in correction for the actual AFR reading.

 

[sideshowBob]

U have to set your target . Do you have the stock pump still ?

Hurricane high output pump

 

[sideshowBob]

I doubt its the tune . MAP sensor ? The actual AFR in any case is too lean. The injectors are getting there as they are adding tons of fuel in correction for the actual AFR reading.

I will start the season with a new O2 sensor as well in case it is sending false info.

 

[sideshowBob]

Thanks guys for all the input/info but I have hijacked this thread too much already.
I will open a new thread if needed once the riding season progresses.

 

[Motorhead]

Yes, no tune in my SW but maybe someday

You have proven part of my point in that most on here enjoy comparing their tuned sled to another stock sled.

When I first got my 2017 Winder, I would say how deceptive the speed and power were!

Then after the 270ish tune, I could no longer say that, it demanded much more respect!

Even with my milder tune, I agree that 105-110 on a hard packed surface doesn’t take 1/2 throttle at all!

 

[Doc Harley]

So...I'm watching a muffler install video for Comp R. Please tell me that's not rust on that support in pic!
If it is, it sures says a lot in terms of Ski-Doo's quality development team.