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Ski-Doo: TURBO Turbo discussion for Ski-Doo aftermarket turbo sleds
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Old 01-27-2018, 09:34 PM
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Default Silber 850 knock sensor

Full throttle pull for 20 seconds 4' of powder stated to fall on its face and blinked a knock sensor on the gauge. Anyone have this happen??


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Old 01-27-2018, 10:30 PM
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What elevation, and boost?

What fuel?



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Old 01-28-2018, 02:03 AM
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5000' 50av-50pump 5 psi


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Old 01-28-2018, 06:11 PM
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Gear up two teeth on top sprocket, hitting rev limiter..

Sibler should of added more gearing to there kits, especially for guys running under 7000’
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Old 01-28-2018, 07:12 PM
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Default Sled turbo sputtering

No that’s not the problem it’s a lack of fuel not gearing your afr are to high if you keep running it like that you’ll fix it for sure it will go boom
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Old 01-28-2018, 07:51 PM
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Just got off the phone with the guy that hit the over rev/ knock sensor, he uses 120 octane fuel and since gearing up problem solved..
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Old 01-28-2018, 08:05 PM
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I have the 26 tooth to gear from TKI
To go to 2.4 gearing running 2.52 now
Running SHR weights 6 gram screw 2 gram on bolt clicker 3
Pulls 8000 ever time I look down but the recall says 8440


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Old 01-28-2018, 08:15 PM
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Ya this pdrive is defiantly I think leaving something on the table, my stock 850 is also showing 8400 max rpm, but only shows 8-8100 on a big pull when looking

I looked at my stock primary after the last few days of hard 100 second pulls and the belt is up less than 1/2 inch from top of primary... thee is no way in hell that it can’t over rev with a turbo added making another 50 hp..

Why Sibler needs to add some gearing, my other two turbo xm sleds run 2.03 and 2.10 gearing and belt goes one inch from top of primary on a good pull at 7000’
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Old 01-28-2018, 09:23 PM
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Talking with a tech tonight, he says after 8300rpm ecm starts pulling fuel, this would also lean out and hit knock much easier, possible det plug damage you seen

Gearing up was on the top of his list of things to remedy problem
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Old 01-29-2018, 07:27 AM
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Old 01-29-2018, 09:08 AM
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