At a loss on my problem

[jsandgren10]

Hey guys,

When riding last weekend I shut my sled off and went to start it again and it wouldn't hardly run, and wouldn't run at idle. I have a silber kit on it and was running great before. I thought my stator failed and so I took it to my dealer. I removed the turbo and oil tank to make it easier for them to put in a new stator. I left the controller, airbox and injectors in place because I figure it would have no effect at idle. Anyways he just called me back and said the stator checked out fine, seemed the reg/rect. was fine, hooked it up to the computer and got some codes about straining the pto cylinder, a couple det codes, but have good compression in both sides. He went and started it and said it is just dumping raw fuel out of the exhaust and won't idle and with motor turning so slow it flashes my gauges cause the flywheel isn't spinning enough to keep them on but if he taps throttle it they will stay on but continues to just dump fuel out of the exhaust.

Anyone have any thoughts? He is going to test the TPS because I believe the dobeck box runs off it.

I told him if its not that I will take it back home and see what I can find, but was hoping those with these kits have a better idea of what it might be. He also recommended the "fix" kit with the stress I have put on the motor with the codes he saw with the turbo.

I am junking the dobeck controller for a boost-it setup but wanted to see if you guys thought that might be it or could be something else.

Thanks.

 

[gmustangt]

Sounds like Tps to me.. It takes the dealer 2 seconds to see if it's in spec, so don't know why he didn't do that as part of trouble shooting.. I wouldn't point the finger at the dobeck box.. Unlikely that's the cause..

 

[Going West]

Could be reeds, but i would unpluge the box and see if it runs fine on the factory cdi

 

[NapaMatt]

Injector... Stuck open!!!

 

[jsandgren10]

They calibrated the TPS, and is still dumping fuel. Sounds like an injector is hanging open, any idea on how to make it close?

I'm heading down to pick it up and figure it out so I don't have to pay shop time.

 

[jsandgren10]

Got my sled home, unhooked the dobeck box and it idles and runs just fine. Not sure what is wrong with the box, but am going with a different fuel setup anyways so will wait for it to come in.

The dealer hooked it up to the computer and found these codes:

P1337 Max Det correction limit reached PTO Cylinder (2 times)
P2337 Cylinder 2 (PTO) knock level critical (18 times)

I have only seen the det light twice, which I assume is the P1337. What do you guys think on the other error code? I am running 10psi at about 105 octane I shoot for 50/50 of 91 pump/110 sunoco race, but since I am usually only down half a tank and put a 5 of race in each time I am closer to 105 than 100 octane.

Also had a couple codes of it engine over temp fault but know when I was in IP it was running really hot when we got somewhat lost in the clouds and had to slowly find out way back down.

 

[Going West]

The det code does not come on every time you hit det, it only comes on when there is no more timing that can be pulled, the computer however will note when it happens and thats were your other 18 codes prob came from.

 

[jsandgren10]

That makes sense. What do you guys think the culprit of it is, need more octane for the boost? Bad fuel mapping?

I'm running at 6000-8000 feet with 10psi on 105 octane. And don't think anything is touching otherwise it would throw the det light more I would think.

Thanks.

 

[Going West]

You should be fine for fuel. The one in our group runs 10psi on av and has no det issues but he is running a timing retard modual..

 

[mattymac]

pump gas has a more adverse affect when mixing with race fuel. just cause you take say 5 gallons of 90 octane and 5 gallons of 100 (to make the math easy), mixing them wont get you 95 octane in theory.

since pump is more prone to ignite sooner, it has a tendency to start the burn on the race fuel alot quicker.

I was gunna say that the doebeck was the culprit right off the bat!

BTW where did you take it to?

 

[bmanke]

Is there any fuel blown back into the air box. If so could be a broken reed. Just did this on a silber. Ran pretty good then started getting erratic. Finally lost a cylinder. Lost part of a reed.

 

[gus bohne]

ALL the det you silber guys are seeing is a direct result of a small compressor overheating the charge and a much too small turbine.. get one flowed and you will see just how OFF target that turbo really is...

drop the turbo in a box and put it back on EBAY where he found them, get a 2871 and smile with 100 degree lower charge temps..

lots of guys have done the testing for you already with results posted of charge temp reductions JUST from getting rid of that pachinnko turbo..

you get what you pay for is soooo true in the turbo game..

 

[jsandgren10]

I don't see it being just the 2860 considering the other brands that also use the 2860 such as boondocker on both their pros and pro climbs and all the m8s out on the snow.

 

[powerfuldodge]

ALL the det you silber guys are seeing is a direct result of a small compressor overheating the charge and a much too small turbine.. get one flowed and you will see just how OFF target that turbo really is...

drop the turbo in a box and put it back on EBAY where he found them, get a 2871 and smile with 100 degree lower charge temps..

lots of guys have done the testing for you already with results posted of charge temp reductions JUST from getting rid of that pachinnko turbo..

you get what you pay for is soooo true in the turbo game..

I don't really agree with this statement...I run the silber kit at 1000ft just running 4.5 PSI. Ill winter long I was doing a mixture 91 and 144 octane..But over the weekend I couldn't get any race fuel so I ran straight 91 octane with the stock head...I put 320miles on the sled and it worked perfect...I'm not running that high of boost but I don't think the charge temps are that hifg that it would cause DET..

 

[hobbes]

I've been running mine at 12lbs boost for 700+ miles now, 7000 and up altitude on 100% Av. If you are hauling fuel anyways, why not run Av? It's cheaper, way easier to deal with (you aren't always mixing, guessing at what you have in the tank), and you can be 100% sure you are getting a MOR of at least 103 or better. It just makes sense. I've only been put into DET limp a handful of times and that was all due to over rev.

Now back to your original problem, a stuck injector is obviously not caused by the size of your turbo. I have heard of some problems with injectors on the Pro's, both on turbo'd and stock sleds. The question will be which injector is it, a stock one or one of your auxillary ones. If I had to guess, the sticky injector is on cylinder 2, possibly causing those codes. The other thing is you may have a bad Dobeck box. I had a bad box do the same thing to me earlier this year and just dump fuel, I ended up having to remove the box completely and babying the sled out of the backcountry that way. Good luck and let us know how it goes.

 

[jsandgren10]

I like the idea of AV gas, which I may go to later. It is just I can buy a 55g drum of race for $370 so is pretty much a wash on price. And where I live and head to ride there are no county airports, I would have to remember to pack cans down the hill when I knew I was going to ride, where with a drum at my house I know I got fuel and then top off at the gas station.

Yea I'm not sure if it is a stuck injector because I removed my dobeck box and it is running fine now.

 

[hobbes]

I've had it with the Dobeck controllers, I actually have a spare in my backpack at all times. I ran them on my turbo Apex also and had the same kind of problems. They are good guys to deal with and usually take care of you if something goes wrong, I just hate having to dick with it all the time. And as with anything, Murphy's Law prevails and those damn boxes go bad at the worst possible place and time. I'm going to give Neil's Boost-It system a try next year...

I hear you on the avgas thing also, I'm just spoiled because our small local airport has a credit card machine so I can go fill my totes any time I want. Most of the time it runs about 4.90-5.00/gallon. I've been running 100% av for the last 6-7 years on both this sled and my apex at 18 lbs. Nothing but good luck with it. If you do get setup to be able to use it I'd sure recommend it... you just never know what you are getting at the pump.

 

[jsandgren10]

Yea I didn't want to have to worry about the dobeck box anymore so have a Boost-It setup in the mail, should get it next week, will install it and see how it runs.

 

[jsandgren10]

pump gas has a more adverse affect when mixing with race fuel. just cause you take say 5 gallons of 90 octane and 5 gallons of 100 (to make the math easy), mixing them wont get you 95 octane in theory.

since pump is more prone to ignite sooner, it has a tendency to start the burn on the race fuel alot quicker.

I was gunna say that the doebeck was the culprit right off the bat!

BTW where did you take it to?

I took it to Bill down at Adrenaline. Hows the apex running?

 

[hobbes]

Yea I didn't want to have to worry about the dobeck box anymore so have a Boost-It setup in the mail, should get it next week, will install it and see how it runs.

Keep us informed, I'll be ordering mine up soon.