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I just bought a Silber turbo for my 2016 Axys. I thought I would post some useful things I have learned and am learning in my setup process. Maybe this will help some folks. Maybe not. The setup rips, save for a couple little bugs to work out. I am running at 10000' and up. I have been playing with the 3 and 5 psi springs. I wont mess with the 7 until I get the lower boost dialed and we get more snow. I am also on a 155 so keeping the front end down in hero snow is enough work with low boost.
Turbo bark/ surge/ flutter: This is not a good thing even though it sounds really cool. I know a fair bit about this in my automotive experience. It will cause your turbo to slow and loose boost as well as put unnecessary stress on the turbine/ compressor wheel. notice that the Silber does this more than others. What I found is that the BOV spring is too heavy for the low amount of vacuum the 2 stroke produces. I have cut some coils off of my BOV (per Justin Silber's instruction) and the surge is much less. I will keep playing with this. It should open with about 7 PSI vacuum or just by sucking on it with your mouth (seriously though!)
. Mine was opening at around 15-17 psi in stock form which is fine on a 4 stroke. You should get a one time sort of psst sound when letting off the throttle. Google turbo surge, then google turbo blow-off valve. This Silber blow-off is fairly quiet as it is and internal BOV so you may not hear much of anything when letting off.
Waste gate Springs/ Gauge/ Boost controller: I have not put a boost gauge on yet, however I am almost positive I producing more boost than the spring rate. With the 3 psi spring, I was able to climb just about anything even with a couple feet of fresh. I have read other posts saying to add about 2 psi to whatever spring you are running. I plan to add a gauge and a manual boost controller to have full adjust ability on the fly.
Fuel: I tried standard 91 ethanol fuel. She ran great until making hard pulls at WOT. I got DET even with 3 psi whether in ethanol or non- ethanol mode . I switched to 100% avgas and no more DET. This however gave me a bottom end bogging whether in ethanol or non- ethanol mode. I believe the 100% 100LL is causing too cool of a burn at such high elevation that it is causing this effect. The best I can describe this is that it feels like a carb that is too rich and loading up the plugs. I will be tapering avgas until I find the perfect mix.
Clutching: Plan to spend 500.00 on some custom clutching. The Silber setup works and keeps the clutches cool, but has some less than desirable characteristics for boon docking. I find that it has a strange hanging effect when decelerating and engages pretty harshly. I have verified that all clutch parts are in stellar condition and moving freely. The stock setup worked flawlessly and was very smooth.
Quiet exhaust: I opted for the quiet muffler. It truly is quiet. Close to stock with a nice tone to it. My ears aren't ringing at the end of the day and less people are pissed at me.
Other Stuff: Silber will only use the tune they have built. Don't plan on them tailoring any tunes if you are having issues. My unit was a little off on fitment. I eventually hammered it into place. Silber offered to repair, but I don't want to disassemble and send back. Silber is fairly helpful on support, but will assume that most issues lie within your sled. I can understand this to an extent as there are a lot of folks who may attempt this install and not really understand how things should work. I would always suggest to go through your sled completely before installing a kit. Install new belt, set deflection, check cylinders, pistons, reeds, and clean ex valves.
Let me know if you have any further insight that can help me or anyone else installing and tuning a turbo.
Turbo bark/ surge/ flutter: This is not a good thing even though it sounds really cool. I know a fair bit about this in my automotive experience. It will cause your turbo to slow and loose boost as well as put unnecessary stress on the turbine/ compressor wheel. notice that the Silber does this more than others. What I found is that the BOV spring is too heavy for the low amount of vacuum the 2 stroke produces. I have cut some coils off of my BOV (per Justin Silber's instruction) and the surge is much less. I will keep playing with this. It should open with about 7 PSI vacuum or just by sucking on it with your mouth (seriously though!)
. Mine was opening at around 15-17 psi in stock form which is fine on a 4 stroke. You should get a one time sort of psst sound when letting off the throttle. Google turbo surge, then google turbo blow-off valve. This Silber blow-off is fairly quiet as it is and internal BOV so you may not hear much of anything when letting off. Waste gate Springs/ Gauge/ Boost controller: I have not put a boost gauge on yet, however I am almost positive I producing more boost than the spring rate. With the 3 psi spring, I was able to climb just about anything even with a couple feet of fresh. I have read other posts saying to add about 2 psi to whatever spring you are running. I plan to add a gauge and a manual boost controller to have full adjust ability on the fly.
Fuel: I tried standard 91 ethanol fuel. She ran great until making hard pulls at WOT. I got DET even with 3 psi whether in ethanol or non- ethanol mode . I switched to 100% avgas and no more DET. This however gave me a bottom end bogging whether in ethanol or non- ethanol mode. I believe the 100% 100LL is causing too cool of a burn at such high elevation that it is causing this effect. The best I can describe this is that it feels like a carb that is too rich and loading up the plugs. I will be tapering avgas until I find the perfect mix.
Clutching: Plan to spend 500.00 on some custom clutching. The Silber setup works and keeps the clutches cool, but has some less than desirable characteristics for boon docking. I find that it has a strange hanging effect when decelerating and engages pretty harshly. I have verified that all clutch parts are in stellar condition and moving freely. The stock setup worked flawlessly and was very smooth.
Quiet exhaust: I opted for the quiet muffler. It truly is quiet. Close to stock with a nice tone to it. My ears aren't ringing at the end of the day and less people are pissed at me.
Other Stuff: Silber will only use the tune they have built. Don't plan on them tailoring any tunes if you are having issues. My unit was a little off on fitment. I eventually hammered it into place. Silber offered to repair, but I don't want to disassemble and send back. Silber is fairly helpful on support, but will assume that most issues lie within your sled. I can understand this to an extent as there are a lot of folks who may attempt this install and not really understand how things should work. I would always suggest to go through your sled completely before installing a kit. Install new belt, set deflection, check cylinders, pistons, reeds, and clean ex valves.
Let me know if you have any further insight that can help me or anyone else installing and tuning a turbo.
