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 that were suggested 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.
cant figure out what this damn stuttering is!
- Thread starter Octanee
- Start date
i plan to pressure up the system, and on saturday, my previous trip out, and where those vids came from, i started on Clicker 1, because its 1st ride i turned it up to 7 pounds from 5, so i put it at 1, then started to bring them up to try to get my rpm, i mean, hell, i know somethings not right, i mean 2 pounds more boost, and 1 clicker?... that dont make sense
i talked to brad @ aero and he said that chances are it might be the intake, and yeah saying that if its not sucking air freely and being forced to suck, that it can create backpressure, reduces power, which ive been having i feel, increases the charge temps, which i did notice my charge tube was warmer then it usually would be, and by that i mean my charge tube has always been cool to the touch when ever i touched it but that day it was fairly warm
so going to try to pressurize system and clean that filter out as best as i can, and if that dont do it i will see about something like not running with the pre filter on and see how that might change something,
i had also thought of trying it with out the filter on, on saturday but with all the powder i was bound to suck alot of snow in so not a good idea
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its only the pre filter, nothing else, dont need a actual air filter i figure because its winter, the dust and dirt is hopefully 7+ ft below
I dint realise your running an aerocharger. From the little experience I personally have and also from talking to guys with more experience withthe Aerochargers, I have found they are very sensitive to a snorkle. which is why you rarley see them with anything but that little screen on them. I know a few guys that tried to run snorkles and went back to the screen. I do know that the plumbing from the filter to the turbo has to be big, 3" or larger. if you try to run anything smaller than 3" it seems to really choke the Aero's.
Knowing you are running an Aero make my first suspect the snorkle now!
yeah, not a aero, a garret 2876, i talk to brad because even though its aero chargers, he still has alot of knowledge towards issues in general, and from the turbo, its like a 4" 90 elbow, to a 4-2.5 inch reducer i think? then straight up into the snorkel
My bad! Jumped to the wrong con clusion I guess!
Does seem like it is starving fer that there air stuff fer sure though! Yep!
Does seem like it is starving fer that there air stuff fer sure though! Yep!
You might be to small on the intake, a 2.5 inch flows 31% less than 3 inch and the small filter on the end ,your makin your turbo suck hard, go with what comes off your turbo 3 or 4 all the way, and put a big surface area frogskin deal on the end,or just run open turbo to try it out.
well, i got the 2.5" or so becuase when i ordered the boondockers snorkel thats the biggest they went, and they say it should be absolutely more then big enough, or so you'd think, but i dont know where to get a 3" snorkel? i mean i could do that if i wanted to,
just put a screen over the inlet and call it good. mesh the panels out good, your sled will run a hell of a lot better then it does right now.
Yes 3-1/2 will work, but he is starting an inch smaller than you, I'll bet its just too much restriction especially when you add the blockage fromthe powdery snow.
By the way cool idea for your snorkle, simple yet effective, I like it!
We got a intake that will work for ya. Will sell any part you need.
What is your fuel pressure doing when it starts to do this? Is it consatant or fluttering?
what is your pipe pressure also?
These are the things that i have seen cause this over the years
not enough weight in the clutch
not enough air
bov spring to light
pipe pressure to high caused by to small of inlet pipe or down pipe or max out cfm's
injector timing off
head design.
hope this helps
What is your fuel pressure doing when it starts to do this? Is it consatant or fluttering?
what is your pipe pressure also?
These are the things that i have seen cause this over the years
not enough weight in the clutch
not enough air
bov spring to light
pipe pressure to high caused by to small of inlet pipe or down pipe or max out cfm's
injector timing off
head design.
hope this helps
We got a intake that will work for ya. Will sell any part you need.
What is your fuel pressure doing when it starts to do this? Is it consatant or fluttering?
what is your pipe pressure also?
These are the things that i have seen cause this over the years
not enough weight in the clutch
not enough air
bov spring to light
pipe pressure to high caused by to small of inlet pipe or down pipe or max out cfm's
injector timing off
head design.
hope this helps
Just measured my intake for the filter, and it is 3", odd i could of sworn it was a 2.5" intake, but nope its actually a 3" intake, i cleaned out my pre filter and its looking much better now, so hopefully it does the trick,
dont know fuel pressure, or pipe pressure, but im thinking the whole, intake restrictive, causes turbo to work harder to suck air, exhaust flows less, back pressure increases, charge temps increase,
i know my intake wasnt sucking, and this stuttering has been a issue getting worse and worse, my charge tube felt warm last ride, usually its always cool, and i know my 1st 2 rides where sled ran 100% perfect that charge temp was always nice and cool to the touch even after a 10 sec pull or 15 sec, then it started to go downhill,
i do plan to get a fuel pressure gauge but i dont see that happening this week now sadly
, and i will give yeah a call if need be bryce for sureand my blow off valve, was giving me issues i was getting bog and stuff before, i had to return to idle basically for it to kind of fix its self, i havent had that issue yet now that i put a spring in it, more of a home made one as the one it came with was certainly too stiff
also i look back to this video, like i said earlier my 1st 2 trips it wasnt the snow that was coming overh teh ood so filter did not get snow on it, also that was the 2nd time filter ever been used so i would hope it would not of been plugged up yet....
at 1 min in looking at that vid, you see boost comes on fast, hits hard, pre filter does not look like its being sucked in at all, its flowing very nicely
http://youtu.be/-9EydbG3lG4?t=1m
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How are you doing with it ?
eh so so, today i figured out what hte bog was, it is the fuel controller, i leaned stuff out, and how much fuel per pound of boost, but yeah it turns out that when it stuters it was going pig rich like from 1000f to 500F, (i should of looked at my gauge before but i was also worried it was damaging my engine so i usually didnt let it stutter) it was just dumping alot of fuel in, which i dont know why, other wise the setting i got it at right now after about 10 seconds or so its at about 1250F so i ened it richer but when i try to go richer it starts to get stuttering a bit but clears out of it
also today was a slight powdery day, mainly what was untouched from last weekend and i cleaned out my pre filter and i would say it deff helped alot, i did not get any issues with the pre filter today
aside from that stuff, the sled does not go like i would think it should @ 7 pounds of boost, my dads 09 M8 pulls, say a 72-75 KM/hr track speed on this hill, i pull a 95 km/hr track speed, and if 1 figures 10 hp per pound of boost or even 9 or so, i mean i got 60-70 hp more and 20 km/hr track speeds??? i would think i should have more track speeds then that
so im wondering about my clutching now, my rpm's are on 8,000, odd thing is, is i went from 5 pounds boost, clicker 6, to 7 pounds boost now im on clicker 5.... i would think i would be more like clicker 4 atleast?, in theory i added like 18-20 hp...?
did you try adjusting your clickers higher??
i know i ran mine with some terrible clutching and it was pulling 8k all day, changed primary springs which theoreticall dropped like 1200 rpm, still pulling 8k. turbo motors need load to make power, if you dont load it, it wont make power.
so just sounds like you need some more time playing with the box and getting it tuned right?
i know i ran mine with some terrible clutching and it was pulling 8k all day, changed primary springs which theoreticall dropped like 1200 rpm, still pulling 8k. turbo motors need load to make power, if you dont load it, it wont make power.
so just sounds like you need some more time playing with the box and getting it tuned right?
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