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Message: <blockquote data-quote="thomask" data-source="post: 78396" data-attributes="member: 530">Hi to all sifus, It is time for me to share what I’ve learned since you all has taught me a lot.  According to a friend of mine, if you were to upgrade your engine to a higher cc (and I mean E34 here) you also have to change the rear wheel gear ratio to a lower value.  If you don’t, you will have a higher rpm at high speed which leads to higher fuel consumption and under power during high speed, but you’ll have good acceleration la.  Not too sure whether it’s true but sounds logic.  His 525 auto reads slidely  more than 2000 in his rpm meter when reach 100km/h.  He has his e34 m20 520 converted to m20 525 and change to a lower gear ratio at the rear wheel.  The other thing I wanna share is, to convert from M50 2.0 to 2.5, you don’t have to change the whole engine.  Remain the top part, and change the lower engine block.  It will be cheaper that way. Anyway, I’m happy with my 520 but the thing is…really makan minyak…and with the increase of petrol price…wat lau eh…sometimes really cannot tahan la….thinking of a way to reduce the fuel consumption….my car is doing about 13l/100km…any suggestion?...</blockquote>