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Cold Weather VS Tunes (Race)

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75northface

75northface

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Location
Sudbury, Ontario
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Canada
Snowmobile
- 2017 Sidewinder XTX SE
- 2016 SR Viper LTX DX
- 1997 Mach Z
It has been an exceptionally cold start to the winter, and in most cases we are seeing record low temps hanging around for the past couple of weeks.

These temps combined with questionable fuel is a recipe for disaster. That being said, how are the heavier tunes holding up in these temps?
 

You are right. At -35 motors definitely get some added stress. I did see this earlier today.
 

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Going back to early dyno tests it was know the stock fuel pump can't supply enough fuel at sub zero temps boosted up. So go lean on bar gas in the UP at WOT and it's over. It was like -20 up there this morning.
 
Never Satisfied said:
Going back to early dyno tests it was know the stock fuel pump can't supply enough fuel at sub zero temps boosted up. So go lean on bar gas in the UP at WOT and it's over. It was like -20 up there this morning.
Click to expand...
That's not true... Thats why field testing is critical. We are running plenty rich with a stock pump stock regulator on the new TD max 17 which is extremely powerful. I was testing the new max 20 on a stock fuel pump 20psi two weekends in a row. Tons of power but now it's out of fuel...

I recommend a fuel pump above 19psi to be safe...

Sent from my SM-N950W using Tapatalk
 
Turbo Dynamics said:
That's not true... Thats why field testing is critical. We are running plenty rich with a stock pump stock regulator on the new TD max 17 which is extremely powerful. I was testing the new max 20 on a stock fuel pump 20psi two weekends in a row. Tons of power but now it's out of fuel...

I recommend a fuel pump above 19psi to be safe...

Sent from my SM-N950W using Tapatalk
Click to expand...
Is there anything to be aware of in regards to the cold weather when running the TD Powertrail? I've been riding in -30C all week. Just short rides like 10- 15 miles. The only issue I had was a blew belt.
 
But you have upgraded pumps in all your sleds - haha. Mine ran fine all weekend beating the snot out of it. I'm happy with the power, you have to respect it. I'll turn it down when I want the idiot proof tune.
 
From Dynotech - not tune related, it's the physical capability of the pump.

Also note that while not shown here, the 271hp level taxes the stock fuel pump capacity--there is only 21 lb/hr of bypassed fuel at 60psi fuel pressure and 120+ lb/hr fuel flow (the higher the fuel pressure, the lower the pump output in lb/hr). So practical limitations suggest that 250hp might be max safe in frigid sub-zero winter temps for the stock fuel system
 
lhdriller said:
Is there anything to be aware of in regards to the cold weather when running the TD Powertrail? I've been riding in -30C all week. Just short rides like 10- 15 miles. The only issue I had was a blew belt.
Click to expand...
Zéro issues powertrail has been tested and proven for two seasons un every weather conditions. We have finalized our new aggressive maps td max spool 17 and td max spool 20 for extrême cold... We had dips of - 40 Celsius.

We have a version for the stock fuel pump and a version for the td big pump upgrade. We will start updating guys later this week.

Sent from my SM-N950W using Tapatalk
 
Running the 240race tune extremely hard for 3000+ feet in -30, only issues are belts.
There's so much bullsh&t on who's tune is better that it is so hard to filter through the BS.
If this FB post is actually true then I think more info is needed before you fault the tune.
The 280 tune is 93+ octane, if you're putting 91 or less in and driving it hard then you're not following the recommendation of the tuner and risk doing damage.
 
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Turbo Dynamics said:
Zéro issues powertrail has been tested and proven for two seasons un every weather conditions. We have finalized our new aggressive maps td max spool 17 and td max spool 20 for extrême cold... We had dips of - 40 Celsius.

We have a version for the stock fuel pump and a version for the td big pump upgrade. We will start updating guys later this week.

Sent from my SM-N950W using Tapatalk
Click to expand...
I'm extremely happy with the TD Powertrail. I have the 2.5" turboforce exhaust and installed the Dalton weights. The sled hauls like z freight train and sounds like a Boss
 
The guy posted it was filled up with fresh 91... Non ethanol.... What I think the tune was advertised as requiring?

And was trail riding... And looks to not be a novice... Just saying
 
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