5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
__________________ <span style='font-size:11pt;line-height:100%'><span style='color:blue'> theres no replacement for displacement </span></span>
im so hardcore. i dont even have cup holders
<img src='http://madmansrealm.com/forums/uploads/1101610420/gallery_18_1_1103159534.jpg' border='0' alt='user posted image' />
A. If we run our cars on low octane, we will end up with a ping/s aka detonation.
B. But we also know knock sensors do work hard at compensating for some via ignition timing.
C. High octane is NOT cleaner than low octane.
D. High octane has LESS energy than low octane! No? but has better detergents.
E. High compression engines demand high octane.
A. Due to high oil prices, can zoom zoom find the lowest possible octane at which his engine does NOT knock with? (Forget about what his manual says for now; think OPEC, knock sensors; high/low compression ratios/chips etc) if yes then
B. Can zoom zoom get better results with higher octane? In terms of Performance?
C. Remember no knocks here since these sensors are taking care of his ignition timing and he is running with relatively high compression engine…advance etc? Any thought?
This is the kind of question that can often get as many different responses as people you ask. However, despite your car having a knock sensor there probably detonation occuring at lower-levels that you are unaware of. I have heard many cars with knock sensors pinging. If I run anything less than 91 in my 540i, which is the highest octane you can get in California you will hear significanting pinging. Regardless, a 545i is a 60k thousand car and an X5 4.8 even more. Buying cheaper gas will save you a little bit of money over the long haul, but it probably isn't worth it when you consider the cost of your cars and the potential long-term wear.
I having a racing car and after my last trip to the track I had 5 gallons of left over 100 octane (5.95 a gallon). I decided to put it in my BMW when the tank was near empty. I feel a pretty massive difference...much fatter torque curve.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.