Boonedocker Turbo XM runs rough at 3-5000 RPM

[kfa670]

Thank God, I thought I was the only one that felt this way. I have read thread after thread, post after post about this "low end bog" on the turbo etec and have to say, I have maybe experienced it about 3 times in 300 miles of hard abuse on my '12 with an Aerocharger. The only time I ever had this bog was when I was loaded with snow and I hadn't screened and vented the body, and I was moving slowly in the tress. If I gave it the onion, I'd get a little gurgle and sometimes a small pop and then it would pull through. It only makes sense to me with all the warm air and steam under the hood from not being vented, that when it gulped this nice fat load of warm air/steam, that it would run a little rich for a second. I even tried pinning it from a stand still a few times to simulate what others have been experiencing and really... Can't say I get much of a bog, maybe a little gurgle. Does it feel like an 1100 big bore on the bottom? No. Is it a little slow to spool? Yes. Am I trying to drag race in the mountains? No.

This "bog when pinned from idle" was something that worried me quite a bit before I put the kit on. And afterwards, when I couldn't really simulate this problem, I was worried that maybe I just rode it like a nancy or maybe my thumb was constructed differently than everyone else. Its good to know that at least I have a normal thumb I would say this is a very small, possibly irrelevant issue (at least for me) with a turbo'd etec application. I love the way it works. I'm not pumping brands here either. Kudos to all the builds out there for making these things as easy to tune as a new car.

am i missing something? is there a real world situation where you go from idle to pinned when mountain riding? we've had n/a sleds with unreal throttle response but that being said, always found the most effective deep snow clutching (before starting to move the track) actually "clutches" for 1/2 second so you don't trench (unless a full-on drag setup where you have the traction). the aero setup we're running (felker based), imho has exceptional throttle response. if your rpms are high enough to move the sled, the response is there. i don't care what happens below engagement. the video posted above with the tss kit sounds like it has exceptional throttle response as well. not sure if it's possible to get any better. if you have a two-stroke at idle, with a turbo thats not spooling/ partially blocking the exhaust, how do you produce a situation with no hesitation/gurgle/lag when you mash it? get a supercharger/ripcharger to work i guess? five years ago, if someone told me you could get a two-stroke turbo to go almost 2k miles with no failures at 8 lbs of boost, no fuel adjustments after the initial settings, same reed setup since day one of boost, phenomenal rideablility, and unreal fuel economy i would have asked if you lived in oz. i have seen/heard the rigs of the big names on the pros and cats and don't hear any difference in their rideability. maybe ours and the tss kit work better than the average etec kit? other than making it lighter and an intercooler that keeps charge air temps consistant no matter what without adding lag (not sure if this is possible either), i honestly don't know what else i would want from ours. enlighten me if i'm not getting it. btw, i'm have not sold a single aero kit and am not a tss dealer.

jeff

 

[TRS]

I know this isn't my side of the bench.
But the idle to wide open stab, bog, will get you in trouble at the most in-opportune time. I have been there boondocking steep, thick tree covered hills. When you head back down through the trees and need to stop and change directions fast. Your anticipation of the hit has your body already in motion, and nothing happens. You are now in a vulnerable position when the hit comes on. Sure you can hold the brake enough to spool it, but that is not always possible.
We all learn to ride/throttle around problems. We become oblivious to them, in time, until someone else rides it and reminds you.
When a fix is found and applied successfully, the master will be well compensated.
The 2012 BD kit I am riding now is getting really close, to all smiles, but every once in a while it throws me a curve.