cant figure out what this damn stuttering is!

[Octanee]

hi guys, well i need ideas, and basically need help to figure out what it is, the top of my list right now is the fuel controller box

basically, my 1st 2 trips out with turbo working, 1st day was 3 pounds then turned to 4 pound sboost, had 0 issues, i could open it up WOT and it ripped,

2nd day, 5 pounds boost all day and it ripped, was fast, pulled hard, turbo spooled up fast, i was very happy with it,

then the next trip out, i forgot to put knock sensor on after pulling head to check wash and domes, but i had caught that the knock sensor was not on, 1 minute after the truck, and that day it started to do it, boost was slow to come on, not like day 2, it was fast and agile, and i try to open it up and it just stutters out, 3/4 throttle, barely fine, it does hit powerband but lower 7300 or 7200 and as soon as you open it WOT instant stuttering out hard

also i get some stutter like hesitation when i try to get moving some times, its kind of choppy and hesistant some times

so, even to this day its still doing the same old crap, ive checked my det sensor, thats all fine, check blow off valve, RAVE VALVES are working, i just cant figure it out

now i see that at 7 pounds boost later on yesterday it wasnt fueling right, it seemed like at times it did and other times it would shoot up to 1300F FAST, like 2 seconds on throttle fast

So i have NO IDEA whats going on! i believe my slow spool and that i dont feel like much power is due to this stutter issue, im thinking fuel controller box at this moment, what do you guys think?

of course this is useless with out vids, so heres 1 TRYING to play in some powder, and 2nd vid is 100% basically dedicated to showing off the damn friggin stutter i get, i greatly appreciate all the help because this is my only issue i cant solve and i need to solve before doing anything like clutching, its driving me nuts.....

http://www.youtube.com/watch?v=l4GtPfIlR84

http://www.youtube.com/watch?v=lJINJQFSZ0I

 

[Wheel House Motorsports]

check pipe for cracks, leaky exhaust etc. makes it fuel like garbage, laggy, and no top end power.

 

[Octanee]

check pipe for cracks, leaky exhaust etc. makes it fuel like garbage, laggy, and no top end power.

i will, but the biggest problem is the stutter, i knwo the exhaust is not causing that issue, its starting to piss me off

 

[Wheel House Motorsports]

that thing sounds like it is INSANELY rich on the top end. like your fueling is ok down lower and as soon as you try to get into the top end it just floods it in fuel... what do your plugs look like if you hold it WOT and then kill it? also, pig rich fueling = laggy.

im betting that the plugged up filter is not helping you any, just a fine mist of snow over it will make the sled run much richer. also, plugging and unplugging with snow = inconsistant fueling.

and to save yourself a LOT of time and headaches. cap intake and exhaust and pressure test your whole system. prevents lost days on the hill and chasing your tail.

 

[Octanee]

that thing sounds like it is INSANELY rich on the top end. like your fueling is ok down lower and as soon as you try to get into the top end it just floods it in fuel... what do your plugs look like if you hold it WOT and then kill it? also, pig rich fueling = laggy.

im betting that the plugged up filter is not helping you any, just a fine mist of snow over it will make the sled run much richer. also, plugging and unplugging with snow = inconsistant fueling.

and to save yourself a LOT of time and headaches. cap intake and exhaust and pressure test your whole system. prevents lost days on the hill and chasing your tail.

i dont really have a way to pressure test the system, and i know its not rich, i even Leaned stuff out, but on the egt's it was showing it on the trail leaning out fast, and at that time i know that teh filter was breathing perfectly fine, also on that hill after playing around like that i checked my egt's i remember it being like 1276 or just under 1300

 

[jskattum606]

All you have to have is some duct tape and compressed air. Tape off the inlet of the Turbo and the end of the down pipe. Then pump air into one of your reference lines. I pull the one off of the fuel pressure reg. And blow air into it. Until your guage shows 10psi.
Its irritating you keep wining about this problem but you won't perform this simple task.
Do it now!!! Haha

Also, clean your prefilter material with gas or dawn soap and hot water. I've had those plug up and make stuff run poorly. They look clean but need cleaned every other ride or so.

 

[Octanee]

All you have to have is some duct tape and compressed air. Tape off the inlet of the Turbo and the end of the down pipe. Then pump air into one of your reference lines. I pull the one off of the fuel pressure reg. And blow air into it. Until your guage shows 10psi.
Its irritating you keep wining about this problem but you won't perform this simple task.
Do it now!!! Haha

Also, clean your prefilter material with gas or dawn soap and hot water. I've had those plug up and make stuff run poorly. They look clean but need cleaned every other ride or so.

ah good ol duct tape, ok i will try that and i will also try washing my pre filter, good ideas, keep em up

 

[doo runner]

What size intake pipe 3" ? looks like your filter is collapsing a bit every time boost comes on, you might be starving for air thats why you flooding. What you r afr say when your into boost ,you can have high egts when rich with fuel burning in exhaust.

 

[Octanee]

What size intake pipe 3" ? looks like your filter is collapsing a bit every time boost comes on, you might be starving for air thats why you flooding. What you r afr say when your into boost ,you can have high egts when rich with fuel burning in exhaust.

yeah i see that, i know my 1st 2 days or rides there was not any powdery snow, snow was hard, those days after it was a bit of powder that would get up onto the filter,

i mean maybe the snorkel could be all of my problem? but ive been keeping it clean, i bag er when its on the truck to keep everything off it, only time its not bagged is in the garage or out on the snow

and my charge tube is i think 2.5" i believe?, ill measure it soon here

 

[NITROSKIDUDE]

Maybe try taking out some gap out in your plugs you may be snuffing out the fire.

 

[Octanee]

Maybe try taking out some gap out in your plugs you may be snuffing out the fire.

i had some plugs that i left at factory gapping, they where 28thou, i had made them 20 thou, same results also why i had tried 20 thou, also bought new spark plugs for 20 thou to rule out the spark plugs

 

[spacehog21]

I had intake problems in deep snow with my 1200 as well with a single cylindrical prefilter for an intake.
This would happen when the snow flowed over the handlebars.


I radically improved the design to improve my intake airflow surface area tenfold.

I might have to post a pic up later this week to better explain but it is a very good system.

I used dryer ducting from the turbo, a plastic skeleton on top of the right side panel, course foam (similar to the old revs intake) and then I stitched prefilter fabric over the whole surface of the intake.

I also used a 4" tee and placed a 5" diameter metal cage in the side panel covered also with prefilter material.

Feeding this second filter are two 4" pod filters with prefilter skirts on them as well.


This may seem excessive to some but we have had so much snow fall this year that it broke previous records back to when they first kept track in the town I live in.
When you get off the sled the snow is up to the chest. This intake system really shines when I clear a mountianside gully midclimb and hit the other side at full boost.
The sled disappears and I just keep holding on to the throttle. Soon after that it shoots up on top breathing healthy at 20 psi.




increase the surface area of your intake and let it breathe

 

[Octanee]

I had intake problems in deep snow with my 1200 as well with a single cylindrical prefilter for an intake.
This would happen when the snow flowed over the handlebars.


I radically improved the design to improve my intake airflow surface area tenfold.

I might have to post a pic up later this week to better explain but it is a very good system.

I used dryer ducting from the turbo, a plastic skeleton on top of the right side panel, course foam (similar to the old revs intake) and then I stitched prefilter fabric over the whole surface of the intake.

I also used a 4" tee and placed a 5" diameter metal cage in the side panel covered also with prefilter material.

Feeding this second filter are two 4" pod filters with prefilter skirts on them as well.


This may seem excessive to some but we have had so much snow fall this year that it broke previous records back to when they first kept track in the town I live in.
When you get off the sled the snow is up to the chest. This intake system really shines when I clear a mountianside gully midclimb and hit the other side at full boost.
The sled disappears and I just keep holding on to the throttle. Soon after that it shoots up on top breathing healthy at 20 psi.




increase the surface area of your intake and let it breathe

good ideas, but to increase my surface area i figure might be hard, but i will have to see what i can look at doing

 

[turbo800]

i had some plugs that i left at factory gapping, they where 28thou, i had made them 20 thou, same results also why i had tried 20 thou, also bought new spark plugs for 20 thou to rule out the spark plugs

Try running some Iridium plugs. The stockers tend to blow out the flame over a few lbs of boost.

 

[Wheel House Motorsports]

i would highly doubt plugs are the problem, run plenty of plugs, swapped between em. seen it done. chasing your tail.

your going pigs rich because your filter is clogging. put it under the hood behind some vents or something. might be a little warmer, but you can actually get a real tune on it. i battled many issues with plugging intake before on my old rx1/rt sled. inconsistant power and tuning that was never the same. your leaning out on the trail as there is actually getting air(not covered in pow) then you hit the deep and its chocking out.

 

[turbo800]

I agree Ski-dooin it, I didn't watch the vids til now. It is definitely starving for air!

I stand by the ECS plug vs an Iridium

 

[Octanee]

I agree Ski-dooin it, I didn't watch the vids til now. It is definitely starving for air!

I stand by the ECS plug vs an Iridium

i called boondocker and the guys like well we've used ours on even bigger turbo;s runnign alot more boost, etc, guys like we havent had any issues and his bets that its some how clogged, so he told me to basically give it a good cleaning because other wise he couldnt see why it would be so horrible flowing???

so i guess i shall try cleaning it and hopeing for the best, i would just of thought i would get some bogging out NOT a stutter out, but i dont know after all you guys are the turbo guys, this is my 1st turbo gig

i guess when i tihnk to my self, what has changed since day 1 or 2, is well, nothing really, so i guess if its not getting the air flow nice and easy then maybe boost will be SLOWER coming on? rather then the nice quick fast responsive boost i had before?

 

[Tonysnoo]

I had the exact same thing happening on my tm8. I kept screwing around with fueling and looking at all kinds of things(including the turbo size).

Found out that I was running too light of weight and hitting some kind pipe overrev phenom... The tach was indicating a normal rpm, but the motor acted like it had a stutter box rev limiter built in.

I put bigger weights in it and instant fix. I know it sounds crazy, but its an easy thing to try.

 

[Octanee]

I had the exact same thing happening on my tm8. I kept screwing around with fueling and looking at all kinds of things(including the turbo size).

Found out that I was running too light of weight and hitting some kind pipe overrev phenom... The tach was indicating a normal rpm, but the motor acted like it had a stutter box rev limiter built in.

I put bigger weights in it and instant fix. I know it sounds crazy, but its an easy thing to try.

weird, i know my sleds not too high in rpm, i can hear it, and im running clicker 5 on the primary to get the rpm's so i mean it still has more clickers if i need to go to them, but who knows

 

[maniac mechanic]

Short of having an actual problem with the design of the turbo kit, I would say the problem is one of the few already mentioned. If I were you, I would try some of the easy things first. I would install a filter right on the turbo, eliminating the snow ingestion/filter plugging. Warm air might not be great, but it would let you know if it was the prementioned air starving issue. I would then turn your clickers way down, if your on 5, then turn them to 2 or even 1 and see if it still studders. You might think your not over revving, but sometimes it might sound ok, but can actually be over revving. besides how hard is it to loossen, turn and retighten three bolts, to eliminate that as the cause. If the problem still persists, then I would check for leaks. a boost or an exhaust leak can cause all kinds of tuning issuse. Trust me, you cannot always hear a leak. The best way is to check all hoses and connections, or pressure up the system, as mention before.