Boost it 850 knowledge thread

[ironkid96]

Hey guys,
purchased a slightly used 850 towards the end of last season with a boost it kit installed. With not a ton of info available anymore and boost it shutting down I'm just looking to gain some knowledge from others running this setup. Maybe one post of info could save me or someone else from learning from mistakes..

ive been thru the machine. Replaced reed petals for the season. Was just off break-in and they were strating to chip and crack slightly.

previous owner reccommended a 50:50 blend of good premium and avgas.
i planned blending the best premium i can get with 130LL avgas. Thoughts?

plugs looked good at the end of the season, replaced them anyways out of habit.

I installed a boost guage more to monitor boost levels off the hop. Help diagnose any problems i might encounter early on. Want to find what works, leave it the hell alone. That being said, what is everyone running for pressure?

I was lucky enough to grt the Latest XIC parameters for the machine and put them in the controller. I dont really plan on messing with it for the fime i own it. Sounds like guys do more bad than good.

clutching? Sounds like maybe they just added weight to the stock clutch? What is everyone doing with their clickers? Are you still using this clutch setup?

any knowledge, experience, or somthing to take away from guys running this kit would be appreciated. Thanks.

 

[maierch]

Hey guys,
purchased a slightly used 850 towards the end of last season with a boost it kit installed. With not a ton of info available anymore and boost it shutting down I'm just looking to gain some knowledge from others running this setup. Maybe one post of info could save me or someone else from learning from mistakes..

ive been thru the machine. Replaced reed petals for the season. Was just off break-in and they were strating to chip and crack slightly.

previous owner reccommended a 50:50 blend of good premium and avgas.
i planned blending the best premium i can get with 130LL avgas. Thoughts?

plugs looked good at the end of the season, replaced them anyways out of habit.

I installed a boost guage more to monitor boost levels off the hop. Help diagnose any problems i might encounter early on. Want to find what works, leave it the hell alone. That being said, what is everyone running for pressure?

I was lucky enough to grt the Latest XIC parameters for the machine and put them in the controller. I dont really plan on messing with it for the fime i own it. Sounds like guys do more bad than good.

clutching? Sounds like maybe they just added weight to the stock clutch? What is everyone doing with their clickers? Are you still using this clutch setup?

any knowledge, experience, or somthing to take away from guys running this kit would be appreciated. Thanks.

I just bought one at the end of last season too so I don't have a ton of time on it but from what I've seen the sled runs pretty flawless. I have an intercooled sled and there still is virtually no turbo lag whatsoever, not even a stumble right from a dead stop. If yours didn't come with a boost gauge I assume its a non intercooled version. You should be able to run that one at 4-5lbs of boost with no problems mixing 50-50 AvGas with premium (FYI- 100LL and 130LL are the same grade of AvGas see the link below). I typically run 6 to 7lbs running a 60% AvGas to 40% Premium. I have also run 40% C12 to 60% Premium with no problems.

I believe you're correct they changed the high altitude clutching to sea level (added more weight) for the non intercooled versions. I think they also changed the secondary spring for the intercooled versions as well. Most guys are running around clicker 4 as the primary has a firmer grip on the belt. I'm waiting to get some testing done with cooler temperatures and some deep so before I make any changes to the clutching.

In all I believe the Boost-it sleds are well set up. Neil and TJ do a good job of configuring for the steep and deep. One recommendation I would make is to add some sort of rear suspension modification to the sled as they can be a handful with a stock rear skid.

Good Luck!

http://www.shell.com/business-custo...centre/technical-talk/techart12-30071515.html

 

[snopro]

Chris couldn't have said it any better. Run it at 5 lbs and just ride it. 50-50 Av gas/premium and its a trouble free turbo system .

 

[ironkid96]

I just bought one at the end of last season too so I don't have a ton of time on it but from what I've seen the sled runs pretty flawless. I have an intercooled sled and there still is virtually no turbo lag whatsoever, not even a stumble right from a dead stop. If yours didn't come with a boost gauge I assume its a non intercooled version. You should be able to run that one at 4-5lbs of boost with no problems mixing 50-50 AvGas with premium (FYI- 100LL and 130LL are the same grade of AvGas see the link below). I typically run 6 to 7lbs running a 60% AvGas to 40% Premium. I have also run 40% C12 to 60% Premium with no problems.

I believe you're correct they changed the high altitude clutching to sea level (added more weight) for the non intercooled versions. I think they also changed the secondary spring for the intercooled versions as well. Most guys are running around clicker 4 as the primary has a firmer grip on the belt. I'm waiting to get some testing done with cooler temperatures and some deep so before I make any changes to the clutching.

In all I believe the Boost-it sleds are well set up. Neil and TJ do a good job of configuring for the steep and deep. One recommendation I would make is to add some sort of rear suspension modification to the sled as they can be a handful with a stock rear skid.

Good Luck!

http://www.shell.com/business-custo...centre/technical-talk/techart12-30071515.html

the sled came with the racers edge skid and i didnt like it at all. I dont care to do tailstanders all day but man the skid kept it planted flat. Great if you were a chute climber i guess. Ive never had a problem with the stock skid so i upgraded to
Elka shocks this year and will run it like that.

you dont seem to have a problem changing your fuel mixtures slightly hey? I would think that too much avgas wouldnt be good for you either. Both on injectors and for your air/fuel mix. Im learning with it this year too. Just trying not to learn a few things the hard way..

one other question. There was mention of adding boost to hit your high rpm in diffrent conditions and altitudes. Do you find you are adjusting your clutches at all on the hill?

Thanks

 

[maierch]

the sled came with the racers edge skid and i didnt like it at all. I dont care to do tailstanders all day but man the skid kept it planted flat. Great if you were a chute climber i guess. Ive never had a problem with the stock skid so i upgraded to
Elka shocks this year and will run it like that.

you dont seem to have a problem changing your fuel mixtures slightly hey? I would think that too much avgas wouldnt be good for you either. Both on injectors and for your air/fuel mix. Im learning with it this year too. Just trying not to learn a few things the hard way..

one other question. There was mention of adding boost to hit your high rpm in diffrent conditions and altitudes. Do you find you are adjusting your clutches at all on the hill?

Thanks

I didn't have any problems changing fuel mixtures. The two blends are only 3 Octane points apart AvGas 96.4 vs. Race Gas 99.4. I had a 2013 XM with a TSS side mount kit that I ran straight avgas in for over 4000km. The only problem I had was it was hard on Air/ Fuel sensors until I started mixing Decalin lead scavenger in my fuel.

I believe the premise of the altitude compensating (non intercooled) kits was that you set your boost each day so that your sled is pulling 7900 - 8000 rpm in the conditions you will be riding in (snow depth, temperature, altitude, humidity, etc), then you leave it for the day. That should have you in the 4-5lb range that Ken was talking about above. The idea is that you only have to adjust the boost Tee to get your sled tuned for the day rather than messing with clickers, etc.

If you wanted to go above that you would have to add some weight to the clutch and possibly adjust the spring in the secondary. Cranking the boost without an intercooler you run the risk of detonation on long pulls where charge temperatures get high. Also my personal experience has been that non intercooled high boost sleds are more prone to popping reeds that intercooled sleds. There is a lot of talk in the industry right now about intercoolers not being necessary; I'm just stating what I've seen riding with various kits from Boost-it, TSS, Impulse, Redline, and Aerocharger.

 

[800dragon_rmk]

Ill buy that racers edge skid off you. Pm me

the sled came with the racers edge skid and i didnt like it at all. I dont care to do tailstanders all day but man the skid kept it planted flat. Great if you were a chute climber i guess. Ive never had a problem with the stock skid so i upgraded to
Elka shocks this year and will run it like that.

you dont seem to have a problem changing your fuel mixtures slightly hey? I would think that too much avgas wouldnt be good for you either. Both on injectors and for your air/fuel mix. Im learning with it this year too. Just trying not to learn a few things the hard way..

one other question. There was mention of adding boost to hit your high rpm in diffrent conditions and altitudes. Do you find you are adjusting your clutches at all on the hill?

Thanks

 

[Caper11]

Having a boost gauge is critical even with a non intercooled kit. Cranking on the boost to get proper rpm is wrong imo. You can easily overboost the sled and not know it, and as mentioned above its hard on reeds and also hard on rods.