Quote:
Originally Posted by Watsey
Difficult to tell what could be causing the differences between the claimed outputs and the actual performance from your car.
There are several possible causes :
Boost leak.
Low boost, i.e. not leaking but boost pressure aspect of the remap not operating correctly.
Stuck (or poorly programmed) EGR.
Clogged DPF.
Dirty air filter.
IC seat soak.
Real-time diagnostics and adjustments to the remap while running on a dyno can identify whether there's a problem, and possible root causes.
You could try data logging the car yourself. A V-Gate V2 OBD dongle and the OBDfusion App can real-time log a wide range of data points which can then be exported to Excel. From there you can plot the data in graphically to see what's happening.
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Thanks! Going 1-by-1:
Boost-leak -> likely not so, since I do get sufficient 0-100 times. And I don't hear any "boost-leaky" sounds
Low boost -> I think similar would apply - I would already see issues at 0-100
Stuck, or poorly programmed EGR -> could you elaborate? Don't understand it
DPF clog -> will try to clean
Dirty air filter -> would having a look at it identify a possible problem? Saw a tutorial how to change it, so I thing I could get to it
IC heat soak -> I have aftermarket ATM FMIC - it previously helped to push down 100-200 times vs stock by 0.5s so I don't think it could be the case
Also maybe an important point -> if I look at the sports displays it shows 250-270kW which is 340-368hp (not BHP). If I got a tune for 375-390hp - and I got any of the above issues, wouldn't the sports displays still show me 375-390hp? To my understanding, sports displays show the engine output - i.e. the power it is trying to make based on its setting. If thats the case, it would indicate the tune is not putting the power it should.
Or would it be the case that e.g. clogged DPF would make the engine show 350hp even though the tune tells it to make 375hp?