In the meantime I had to go somewhere and decided to run the car with the vaccum thing disconnected from the arm (since the arm was stuck at the top). So I have a spare turbo so I took apart the flappers and cleaned them up and had every intention of changing turbos this weekend. I previously disconnected the vacuum thing from the actuator arm and the arm would move a little from the top, but would be very sticky 1/4" after you started moving it to the point where you had to pull on it pretty hard to get past the sticky part. Let me shed a little light on the previous statement. BTW I did disconnect the vacuum thing from the actuator arm and the arm seems to go from stop to stop with little effort now, which it wasn't doing before. I will wait to hear from you before I reset it. While I had the car on the computer I checked my timing and it is a bit retarded from where it was initially set 80k ago. Got a boost gage? Fluttering sound on wot, or decel?ītw: 001 = fuel, 003 = mass air flow, 004 = start of injection (or pump timing), and 011 = to expand.Logs sent. Fluttering sound could be overboost if actuator is stuck. You can also observe if the actuator is leaking vaccume and not holding. Get a handheld vaccum pump (mityvac) and pull vaccum on the line from the n75 to vnt actuator and test movement. I don't like it when I get 6 files of only one field recorded cuz they won't share the same time/rpm base.ītw: 001 = fuel, 003 = mass air flow, 004 = start of injection (or pump timing), and 011 = turbo is probably clogged up and not giving full stroke on the vnt. 001 and 003, tells me if you're getting proper fuel and air flow Make sure each run is obtaining 3 fields together on the same rpm base. You can learn alot from watching duty cycles in field 004, and 011. That way I can see part throttle, and idle conditions. Make sure you start log while idling before you drive and let it log the entire trip and let it collect some idle time when you return from testing. If you have vagcom, please vaglog fields 001, 003, and 011 for wot pull in 3rd gear, and then 001, 004, and 011 for good 3rd gear pull. Got a boost gage? Fluttering sound on wot, or decel?Īlot of speculation going on, but guesswork wastes time. ![]() Your turbo is probably clogged up and not giving full stroke on the vnt. If I disconnect the Maf and drive the car around with no Maf the fuel economy goes up to normal the stumbling goes away and the smoking goes away (just makes no boost) which leads me to think it is something electrical? Temp sensors? This problem happened suddenly not gradually. Not sure what you mean by clean the egr, but I will look into that. So that leaves plugged exhuast or stuck open egr? I did not "clean" the egr. Boost seems fine at about 17lbs of boost at full throttle. As far as the turbo actuating correctly I addressed that in my prior post and it is working fine. ![]() No air bubbles from the pump, well no more than there have ever been before, there are always a couple. I put on new injector nozzles around 60k car now has 200k, maybe time for a cleanup. I have checked all boost hoses already in an attempt to solve this along with the entire exhaust egr system. Base timing is just above the middle where I set it 80k ago. I have a new air filter and cleaned intake. You hear it at 9,13,21,32, and 36 seconds.Ĭlick to expand.To address a few of the above. If you watch this video you will hear the noise after he revs it up: Now what would cause that on a non blow off valve/non waste gated turbo? The cavitation or "flutter" can be fixed by either fitting a blow-off valve onto a system that hasn't got one, or making sure the blow-off valve is matched to the output of the turbo and is not working outside its flow capacity and ensuring the blow-off valve is set up correctly. This process, more commonly called "cavitation" places enormous loads on the turbo and can lead to premature wear of the turbo bearings and other load-bearing components. The consequent back pressure forces the air back through the turbine blades. The "flutter" occurs when upon shutting the throttle, air caught between the free-spinning turbo and the shut throttle. The "flutter" noise reported by many excited enthusiasts may sound good but is actually very unhealthy for the turbo. As copied and pasted from the Turbosmart web pages:
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