Originally posted by adam g
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DIY Mapping, I5 experience
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Originally posted by diesel des View PostIn that knock recording, at what time was knock heard? Trying to tune my ears. Arround 50 seconds?
like marbles in a coffee can.
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Originally posted by diesel des View PostGood stuff I picked out that one at 45-53 seconds. Too much timing getting into boost? Cheers des
What you are listening for is the same sound, but usually just one or two "plink!" noises in that same frequency range that is your clue to det onset.
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Originally posted by prj View PostStock ECU will not retard on idle no matter how hard you hammer it. There's a MAP threshold from which knock control is activated. Just thought i'd throw this in.
Probably not too relevant to what you said.
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Originally posted by GazzaG60 View Postok. tbh not tried this on s2. did it on corrado G60 a few times though. car quickly pulls timing.
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the best advice I can give is to listen to your engine on a slow sweep from idle to redline in neutral. this is your 'baseline', since its highly unlikely for your engine to be detonating in this condition. your engine at full load should sound pretty much the same... you are looking for a "new sound", just like you say. something out of the ordinary. the human ear is actually very good at this.
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Originally posted by GazzaG60 View PostI prefer open road to be honest.
I don't drive on a rolling road. I prefer to either drive and log or be the passenger and tweak as I go.
ive found that air, temp and other factors such as hills and driving style affect certain parts. granted rollers allow you to set rpm etc.
Any tips on 2 these points.
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Originally posted by adam g View Post1: the ability to keep a steady state as already mentioned which makes it difficult to tune each cell on the timing and fuel grids individually
2: knowing when you have reached the point when you stop making power and if you are better off tapering the boost down towards the top of the rev range.
Once it stops decreasing you've hit that point you're speaking of.
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im with prj
datalog the runs. thatll give you the info accurately.
general feel gets you a good way there.
think of it this way. when you drive about normally ie cruise, the odd blip etc you feel a problem, you see a problem. ie misfire, smoke from exhaust.
when you have done a bigger turbo you can feel the drop off easier. I find I can feel the turbo drop away and also the other side where the engine starts to run out of flow.
egt and afr dials tell you a lot and are for me easily legible up to about 470hp.
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