Hmm... 1.8mm-2mm would be good for a 8.6:1 set up. I'm not sure what does the mechanic meant by 1 more time skimming... Cause I don't know how much material is skimmed from ur engine head. But it won't be anything more than 1mm. If 1mm, the cylinder head cannot pakai liao...
Have i missed anything in my previous post..? I mean, he rechipped his ECU to 9krpm, but the e-manage only till 8krpm.
But I wonder if he tell the shop that he's gonna boost that high when he does the rechip. Cuz, if the shop knows owner's boosting so 7 high, he would have map for 9-10 AFR and retart the timing at top end within the ECU itself...
Anyway... that's just to let u know that any piston fails regardless of boost... it's the tunning... And BTW, whatever ECU u gonna use... There's no way of getting rid of detonation... U'll just reduce the risk. That's because u have full control over all the mapping within the ECU. Detonation is part of the thermal property of the fuel... Not the ECU.
i know who that guy, he3.. he already check that emange setting. 1) that emanange mapping only set till 8K rpm. 2)ignition timing setting on 0-0 (must set retart for hi boost). 3)injector setting also 0-0. 4)engine cc setting to 1900cc. 5) engine spec must set to turbo engine but set at vtec engine. 6) injector saiz set 560cc but use 700cc. hahahahaha this is the result why that gsr engine KEBOMMMMMMMMMMMMMMMM