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98 is pretty high, it should hoever around 20-30 tops. check if the knock warning is turned to on under etc. also check your engine light works, should come on when you turn key to acc3

The light works but i have never seen it come up while driving. Also i have a few overboosting issues at the moment so i should proably sort them out then get a tune up. Also it wouldnt hurt to run bp ultimate together with a bottle of octane booster per tank?

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you could use that as a temporary work around but if you need to add octane and its knocking that much then it needs to be looked at by a mechanic. ive read your overboosting problem but arent sure why its doing that. with avcr off (assuming its plumbed correctly) when you should just be running whatever the wastegate spring is, wouldnt be a 1.7bar spring?

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