Fascinating, and I'm looking forward to the diagnosis from the experts.
To the untrained eye it looks as if the biggest difference is in the reported AFR; is this an indication that the WI is affecting the lambda reading?
It looks as if there is slightly less back pressure at the top end with WI on, in other words less boost for the same torque, this is the sort of effect that was predicted. Personally I'd have hoped for a more dramatic effect, could it be that we are not seeing huge gains here because the turbo is adequately sized in the first place, and because it has an adequate intercooler?
It might be interesting to contrast this with a car that has an undersize turbo?
Also intrigued about the pinking. It's something I've noticed on mine and I have put it down to a lot of upstream evaporation i.e. the cooling effect of the water is being spent increasing charge density rather than suppressing in-cylinder knock.
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Peter Humphries (and a green V8S)
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