I applied a blacksmoke map last night, and as some people have said they've seen spikey boost etc, I thoguht I'd post some VCDS logs up here.  First off here's the boost, this is third gear foot on floor.

 

 

I'll work my way through other measuring blocks as and when, but if anyone has any particular requests for channels let me know.

Your turbo is not being controlled correctly! It's expected to probably get to 2.6bar in your log. (You need to remove the 1bar of atmospheric pressure in real terms). Your hitting 2.9bar which is unsafe.

Since the turbo is not being controlled correctly it will cut the fuel at 3200-3500, this is seen as the dip in the graph but you will feel like someone has pulled the handbrake on at this point.

From the graph you most likely have sticky vanes which need freed up to bring the turbo under control.

Your turbo is not being controlled correctly! It's expected to probably get to 2.6bar in your log. (You need to remove the 1bar of atmospheric pressure in real terms). Your hitting 2.9bar which is unsafe.

Since the turbo is not being controlled correctly it will cut the fuel at 3200-3500, this is seen as the dip in the graph but you will feel like someone has pulled the handbrake on at this point.

From the graph you most likely have sticky vanes which need freed up to bring the turbo under control.

Thanks for the comment aham_uk. The car's done 95k miles so I guess a gunky turbo is to be expected. What is the safe limit for boost pressure? Presumably the 2.6 the map is asking for is OK?

I just looked back at the pre-remap log, and it was peaking at around 2.9 even with the lower demand.

Cheers,

Mark

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Edited 30 November, 201312 yr by MarkBT

Since the turbo is not being controlled correctly it will cut the fuel at 3200-3500, this is seen as the dip in the graph

Nope. Turbo boost is control by the N75 map, if that fails then it goes into open loop and the PID takes over. No fueling is cut to control boost.

But yes car has a boost issue that needs to be resolved.

Oh group 8 shows fuel requests. 3 shows MAF, 4 shows duration and start of injection. 1 shows injection quantity and duration.

as a comparison 2.6 bar absolute is approx. what the ibiza cupra 1.9 tdi pd160 runs with the gt1749vb turbo as standard

The level requested is about 2.5 bar, when the turbo spools up it should over shoot slightly (roughly 2.6) then follow the request level all they way.

These levels are fine, your currently running at nearly 3 but it could honestly be anything as it not being controlled.

My advice is temporarily remove the map until te turbo is cleaned out/freed up. Although you have recorded the same overboost before and after a remap, turbo spool rates are higher on the map putting the turbo at risk.

I think I'll try the Innotec kit as my first step in sorting the sticky turbo.  Meanwhile, for what it's worth, here are another couple of logs.  I have realised my clutch slips if I boot it from 1500 rpm in third, so these may not be quite as clean as they should be - that might explain what look like odd dips in the injection demand if I subconsciously modulated the throttle to avoid the slip?

 

 

For whatever reason the clutch was in a good mood today, so here's group 8 - fuel demands.