Casual shop discussion about relevant issues, pros and cons, mid season impressions, about Patriot Boost and Slash, includes fuel pump discussion and other problem issues. What we know and how we feel so far...
I know it’s not the type of videos you do but since it’s so relevant to clutching I’d love to see you do a short tutorial on belts, proper belt break in and most importantly when to replace a belt, what signs to look for indicating replacement.
That was a good watch! Thanks for putting in the time to make this, I personally ride an axys still but am playing with the idea of upgrading. I think I’ll wait until the fuel pump and primary issue is fixed tho. Anyway, when I do go boost I def am going to go to you guys for tuning!
How about some old fashioned Powder valves in the upper airbox to help with plugged air intakes? Better with warm air through the turbo then not enough air as you say. And they (might) stay closed untill the air intakes ar getting plugged, as opposed to just a frogskins covered hole in the airbox that always will provide some airflow...
I'm curious if about what I'm guessing is compressor surge. I haven't seen one of these in person yet but in videos as a boost is coming right towards the camera it doesn't sound smooth. Sounds choppy
That fluctuation is a function of the smart valve in the expansion chamber as it relieves pipe pressure to support a stable combustion event... I do tune them to have less modulation ...
I wonder if you know why the 2023 9R's and even boosts are blowing up clutches and they are eating spark plugs often. I believe there are harmonic issue going on; likely in the clutch. Have you found this and if so have you found a solution.
Thanks for the questions, regarding the spark plugs, the damage to the plugs is being caused by detonation. Clearly the factory calibration could use a little help in this department. Particularly at certain elevations and with certain locally available high ethanol content fuels. A good tuner and can alleviate these problems. We have available tunes for Boost to eliminate detonation but nothing for 9r available right now. Regarding clutches, that problem is somewhat complicated and is primarily an issue on the 9R models and somewhat rare on Boost. Based on what I have observed it appears to be related to the lightweight crankshaft and components on the 9R allowing a much more violent or harsh transfer of combustion energy to the drive clutch and thus ultimately damaging the splines on the spider allowing a minor amount of movement which ultimately leads to bolt loosening. Once the bolt works lose the problem obviously compounds... think of it like the reduction of flywheel Mass has allowed the individual combustion events to transfer a more focused spike or shock load to the drive and with the movable sheave assembly and spider being the heaviest component and that this assembly is meant to resist torsional shock by utilizing the compressive force and the small splines on the inside of the spider the constant hammering eventually has its way. This is at least my observation, I'm not one hundred percent certain about this but that is at least what I think is going on. That is likely the reason why we see far less instances on Boost.
@@TheVOHK Hmm interesting thoughts on the 9R clutch issues, I was thinking more like balance issues on the clutch or cranks that could be solved with a good balance job. That whole inertial idea does interest me. I wonder how Burandt is making out with his even lighter clutch assemblies. As per the plugs it makes sense as I see it more on the sleds with riders that hold them on the pin longer. All my riding is primarily Revelstoke, Golden and Sicamous BC, mostly 5k to 8.5k feet. I am really thinking I am going to keep my 2021 big bore skidoo for another year as I am just seeing to many of the 2023 sleds have way to many major issues. Thanks for your time.
Great video, very informative! Question on the fuel pump issue… My boost has been making the loud pump noise the last couple days I rode it but I have not seen any codes up on the dash yet.. Would you keep riding it till codes come up or get it to the dealer sooner than later? Thanks!
I imagine within the week you'll have a response from the manufacturer regarding what the best course of action is. But for now if you haven't had a low-pressure code then continue riding it...
We have done alot of testing with both p85 and p22. For many reasons we much prefer the p22 and have had very few failures on boost, now with the updated billet spider the p22 is even more reliable.
Awesome video. Wish you expanded on the pro vs khaos chassis difference and what that feels like. You are one of the few that actually clocked a significant ammount of hours on them....+ 165 2.75 vs 155 3.0 and whatvthat does to a pro chassis.
@@208SledHead yes, and yet I wanted their opinion given the nature of their work requires extensive riding and not just a one or two day test in 1 type of conditions.
@@208SledHead both Polaris ambassadors and both pro's with a tendency for custom sleds that tend to wheelie and be loose feeling that suit that level of a ryder, not much use for the rest of us....and I watched those ofc. Lets not drag this further, I understand what youre saying, but still I made the request that I think will benefit me and some like me, so if they have the time they will do it, if not, thats ok too.
Do you plan on just doing a rear bumper or is a front bumper also in the horizon? Is the pump issue just on the turbo models or is it turbo and N/A models too?
Unfortunately the manufacturer we typically work with on our bumpers is undergoing some significant change and ultimately I'm not certain of the final outcome regarding bumpers... sorry.
Is there any validity to the intake tube on the turbo collapsing under certain conditions and higher boost? I know there are aftermarket solutions to this already but I'm not sure if it's solving the right problem.
There is no reason to EVER have that much negative pressure in the intake tract! Modifications are a must in the upper airbox to prevent such things...
When the vents plug off in deep snow, the 90 degree elbow collapses with vacuum pressure. It needs a real silicone 90 like the rest of the automotive industry uses. Also, opening up the air box with some venting helps that issue.
The fix is not to add a stiffer elbow or a metal ring or any such thing, the fix is to eliminate negative air pressure event all together because of the adverse effects it has on turbo performance in general. We have found that strategically adding ancillary ventilation to the airbox solves the problem.
@TheVOHK I had the axys sidekick with the tunnel dump and your clutching and it was amazing. I'm hoping the new boost will come close. Thank you again I'll have to give you guys a call when I pick the new one up and get some parts on order.
You should take a chassis, maybe last yrs chassis and make a straight tube chassis! I miss tube chassis’s and big bore’s. A BB tube chassis or a turbo but I’d prefer a 9xx bb
Due to space constraints the factory incorporates the diffuser in the silencer. This component is generally incorporated into the exhaust housing of the turbo. For this reason it is more likely that aftermarket silencers will cause a loss of power rather than any potential gain...
Holy cow, I’ve don’t think I’ve heard of a 7200 LPH fuel pump in power sports. What’s that like 5000 % increase in flow to run this tank setup over an Axys eh. Wild. You wouldnt think it would need that much difference when an Axys turbo makes more power on way less fuel flow with same amount of injectors. The world we live in.
So my question is today is the 3rd day I rode my boost was on the trail and would hit 45 mph and it would bog out will not go over 45 it keeps boging out
It sounds like you've reached that point where the unit won't tolerate the break-in fuel. But it could be something more serious than that and the best way to diagnose it is by logging the data. The VTI is a great tool to diagnose problems...
Is it out of break in? If not just keep riding it until it is. If it is out of breaking you really should log that data and we can help you sort out what it is... feel free to email information directly to me erik@vohk.com
Just wanted to let you know I think I figured out the problem on my boost. The fuel selector got switched. Switched her back today and man she came alive!!!!. Just wanted to say thanks again for you're help.
Completely unrelated, but I REALLY wished "Skinz" would change their name. Whoever decided that was a good idea is HORRIBLE at marketing.....sounds like it should be a name for a condom company or something. I'll never own anything from them just because of the cringe factor. Gack.
