All Things Mk5 > How to Guides / Troubleshooting

Troubleshooting - what is 'load control'??

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muckipup:
Hi,

I am hoping that a 'techy' can help me work out what I believe is a running problem with my car.

In short, I see erratic AFR plots on the Dyno which has been described as a problem with "load control" by the experienced mapper who did the remap for my car. On the road, the car runs great up to about 5000 rpm then appears to run out of puff as it accelerates.



This got me thinking about this "load control" that was mentioned. I don't have a clue what this is other than what the name suggests or what hardware/sensors directly influence this. Despite this, I went out and logged the Specified vs Actual Engine Load in VCDS.



Does this look right?

I logged a bunch of other stuff and can see no issue with misfires (coilpacks and plugs seem ok), actual vs requested boost (tracks very closely although requested is lower than I would like for a Stage 2+), MAF values are a bit low for an ITG intake (200 g/s max) but not sure if this is cause or effect, fuel rail pressure actual tracks very close to requested (although requesting about 10 -15 bar less than the Autotech HPFP can produce) and low pressure stays up well too.

Any ideas please??? Does anyone alse have figures for actual vs. requested load that I could compare with? Is this likely to be hardware/sensor on in the map?

Thanks

Richn83:
Mines a standard K03 mate but see logging graph, the engine load specified and actual is clearly off on yours also very odd that the values have such a dominant plateau to the graph nothing is normally that perfect.



 Also just done you a graph of my load specified vs actual

muckipup:
Thanks Rich,

This is the first comparison of engine load that I've seen. As you say, my figures appear to be way up there and almost look like they are hitting some kind of limiter. I have still got no idea what 'controls' load control.

Richn83:
When i did my logging I tried to look into what engine load was but I couldn't find a decent explanation, do you have any of the other figures to go along with your load values such as boost fuel pressure lambda etc to see if there is any that looks off in those values?

muckipup:
Hi Rich,

Was out tonight and did a bit more logging. A bit tricky as I had to do 4th gear pulls (third just ended up with wheelspin) - thank heavens for the disused airfield in my back garden  :innocent:

I'll post up some graphs from one of the runs as plotting out the others showed them to be almost identical in every respect. Will get these posted tomorrow when I get a moment  :happy2:

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