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      04-11-2012, 09:30 AM   #30
Voytek
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Drives: 2012 BMW Z4 20i
Join Date: Jan 2012
Location: Belgium

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Quote:
Originally Posted by Kalem View Post
I've checked the difference between 520i and 528i is in the compression ratio 11:1 vs 10:1
All parts are the same including engine blocks, crankshaft, cylinder head, head gaskets, drive shafts and transmission etc. The only part I find different is the piston, there are two types of pistons; one for lower compression engines (S858a=yes). Given the head gaskets are the same, the piston should be the part that reduced the compression ratio in 528i. Don't know if the quality of the two pistons are the same or not? Maybe just changing the head gasket to reduce compression ratio to 11:1 and remap ECU will do, any other thoughts?
Thing is not many tuners seem to be busy releasing the full potential of the N20 in the Sdrive20i version? Too bad... I would really like to get it up to the 28i performance. I don't need 300bhp configs but 240-250 would be perfect!
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