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can our bimmer use RON 95 fuel??
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<blockquote data-quote="astroboy" data-source="post: 371509" data-attributes="member: 4527"><p>Tried yesterday in my mini 1.3L VVTi MPV. Engine quieter, lesser horsepower and lesser torque felt ~ butt dyno. After refueling on LDP, saw an E90 325i Sport, decided to keep up. My MPV was struggling badly, entire stretch from Kelana to Damansara my transmission keep kicking down when I push, finally decided to off O/D to run the balance stretch of LDP. Even in 3rd gear, engine is quieter... no more garang vroom..vroommm... lio. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p><p></p><p>I would say my 1.3L just lost 100cc. Cannot play with Wira 1.5 lio..</p><p></p><p>The minimum RON index specified in the user manual only tells us whats the maximum timing retard the engine can cope to keep the engine running smoothly, but performance suffer big time with my compression 10:0 VVTi engine :-/ Low RON fuel is vulnerable to high compression engine like ours to suffer from premature detonation.</p><p></p><p>All newer generation engines are designed with high compression to improve combustion efficiency. That's the only way to develop new engine with higher horse power. Look at power output from today's engine compare with say 10 years ago. For the same CC, how to get more horsepower? The answer is increasing compression ratio and of course some meddling with the cam timing for the so called variable timing.</p><p></p><p>Effort from these engineers are wasted if the fuel can't keep up.</p><p></p><p>What a waste!</p><p></p><p>By the way, my E90 also refueled with RON95 last night, will see how it goes, big possibility of switching back to RON97 next week, before my ECU becomes "cacat" due to too much timing retard. Retard timing doesn't prevent premature detonation, instead its to time ignition to ignite along with detonation, while the piston still on its way up to complete the compression cycle. I am very disturbed with this.</p><p></p><p>I just checked Suzy Swift Sport compression ratio is 11.1:0 and openly declare not suitable for RON95. Civic Type-R is running 11.7:0, also declared not suitable for RON95. Skoda 2.0 FSI 11.5:0 while Range Rover is a mystery which I can't solve. </p><p></p><p>E90 4-potter running compression 10.5:0 and if my 10.0:0 VVti 1.3L MPV can feel the difference, what else can I say about the E90?!</p><p></p><p>Mitsubishi AirTrek Turbo also listed as vehicle not suitable for RON95 despite running 8.8:0 compression while EVO X is on 9.0:0, maybe due to the force induction.</p></blockquote><p></p>
[QUOTE="astroboy, post: 371509, member: 4527"] Tried yesterday in my mini 1.3L VVTi MPV. Engine quieter, lesser horsepower and lesser torque felt ~ butt dyno. After refueling on LDP, saw an E90 325i Sport, decided to keep up. My MPV was struggling badly, entire stretch from Kelana to Damansara my transmission keep kicking down when I push, finally decided to off O/D to run the balance stretch of LDP. Even in 3rd gear, engine is quieter... no more garang vroom..vroommm... lio. :( I would say my 1.3L just lost 100cc. Cannot play with Wira 1.5 lio.. The minimum RON index specified in the user manual only tells us whats the maximum timing retard the engine can cope to keep the engine running smoothly, but performance suffer big time with my compression 10:0 VVTi engine :-/ Low RON fuel is vulnerable to high compression engine like ours to suffer from premature detonation. All newer generation engines are designed with high compression to improve combustion efficiency. That's the only way to develop new engine with higher horse power. Look at power output from today's engine compare with say 10 years ago. For the same CC, how to get more horsepower? The answer is increasing compression ratio and of course some meddling with the cam timing for the so called variable timing. Effort from these engineers are wasted if the fuel can't keep up. What a waste! By the way, my E90 also refueled with RON95 last night, will see how it goes, big possibility of switching back to RON97 next week, before my ECU becomes "cacat" due to too much timing retard. Retard timing doesn't prevent premature detonation, instead its to time ignition to ignite along with detonation, while the piston still on its way up to complete the compression cycle. I am very disturbed with this. I just checked Suzy Swift Sport compression ratio is 11.1:0 and openly declare not suitable for RON95. Civic Type-R is running 11.7:0, also declared not suitable for RON95. Skoda 2.0 FSI 11.5:0 while Range Rover is a mystery which I can't solve. E90 4-potter running compression 10.5:0 and if my 10.0:0 VVti 1.3L MPV can feel the difference, what else can I say about the E90?! Mitsubishi AirTrek Turbo also listed as vehicle not suitable for RON95 despite running 8.8:0 compression while EVO X is on 9.0:0, maybe due to the force induction. [/QUOTE]
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