Leaning Out The Mixtures Vs Fuel Types

[lordsnipe]

Just something that popped into my head this morning...

Many people when tuning their Skylines will lean out the mixtures as the stock maps tend to be on the rich side.

If you put shit fuel in (normal ULP), the engine may ping its tits off. If you take too much fuel out of the map, it'll ping its arse off. This leads me to believe that it achieves the same outcome.

My question is, on a relatively stock Skyline, would running 95 octane be better than 98 octane, simply because the engine would be running a little leaner?

Please post up your thoughts...

[kimbod]

Just something that popped into my head this morning...

Many people when tuning their Skylines will lean out the mixtures as the stock maps tend to be on the rich side.

If you put shit fuel in (normal ULP), the engine may ping its tits off. If you take too much fuel out of the map, it'll ping its arse off. This leads me to believe that it achieves the same outcome.

My question is, on a relatively stock Skyline, would running 95 octane be better than 98 octane, simply because the engine would be running a little leaner?

Please post up your thoughts...

You are confusing mixture and timing. You could pour the 95 in and still get it to ping. Remove some timing and it would go away. That's what the knock sensor does, retards timing when it starts knocking. That's a simplistic way to look at it

Edited July 22, 2006 by kimbod

[maccattack]

The RON values of fuel are nothing more than an indication of its anti-knock characteristics. The higher the RON value the higher the anti-knock. This has nothing to do with running leaner or richer.

[mad082]

the same amount of fuel goes in no matter what fuel it is.