TD5 Air Filter Housing Lid

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What if your gauge is missreading? or the MAP sensor reads higher? If the real boost is 1.25 and it goes to overboost it means that the boost calculated by the ECU is 1.42 which means the AAP must be very low, below 90
 
sierrafery said:
What if your gauge is missreading? or the MAP sensor reads higher? If the real boost is 1.25 and it goes to overboost it means that the boost calculated by the ECU is 1.42 which means the AAP must be very low, below 90
Click to expand...

It wasn’t far off that, it seemed better with the high flow air filter though

tom1979 said:
Well I got the right air filter lid, fitted nicely and also fitted the AAP sensor properly fitted now. Now I don't know what damage leaving it cable tied in the engine bay has done but I don't think my AAP sensor is reading right! Drops down from 99 to 90 kpa, which in turn is causing overboost! Is this kind of drop normal ?? The overboost occurred at around 2:24 and 3:47 in the file, when the AAP was at its lowest! I would have thought a low AAP reading would allow more boost not reduce it

View attachment 146776
Click to expand...
 
The only relevant log is to see all the data at the same time to be able to extract the AAP from MAP ...i should have said ''well below 90''
 
sierrafery said:
The only relevant log is to see all the data at the same time to be able to extract the AAP from MAP ...i should have said ''well below 90''
Click to expand...

Here's a file from a run this morning. As usual the Nanocom readings are all over the place. https://www.dropbox.com/sh/6p87yg2uqxd1zvz/AADMjxlzrfEu4p-or5EymdtFa?dl=1

One thing I did notice was that by the end of the journey I was able to make very nearly 1.5 bar on the boost gauge (good quality VDO unit). With my wastegate actuator rod set as in the photo below I would only normally get 1.25 bar.

I am sure that the reason I have never noticed any of this before is because of the AAP problems I have had and the fact the sensor has never been located within the air filter box.

_4170009 by Tom Cross, on Flickr
 
Standard is 13 but after some time depends how dirty inside or ''tired'' the diaphragm is cos then the wastegate will not open as it should... wind it back 1-2 threads cos normally the max boost under load should not drop just that you avoid the overboost
 
sierrafery said:
Standard is 13 but after some time depends how dirty inside or ''tired'' the diaphragm is cos then the wastegate will not open as it should... wind it back 1-2 threads cos normally the max boost under load should not drop just that you avoid the overboost
Click to expand...

It was a new turbo in September I would hope the actuator would last a bit longer than that! Do you still use that Forge one? How does that compare to standard?
 
Maybe that's worth looking into then as I can't see why it's overboosting, presumably you don't touch the rod (leave it as it comes) and make adjustments only to the manual controller?
 
Yes, the adjustment is through the MBC even though the modulator is there too and the rod just a bit longer than std as the boost curve ti be smoother.
How old is the depression control valve? ...if the engine had a period of excess crankcase gasses those are going into the wastegate valve too and used to mix up things inside
 
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