Ask Lemmy
A Fediverse community for open-ended, thought provoking questions
Rules: (interactive)
1) Be nice and; have fun
Doxxing, trolling, sealioning, racism, and toxicity are not welcomed in AskLemmy. Remember what your mother said: if you can't say something nice, don't say anything at all. In addition, the site-wide Lemmy.world terms of service also apply here. Please familiarize yourself with them
2) All posts must end with a '?'
This is sort of like Jeopardy. Please phrase all post titles in the form of a proper question ending with ?
3) No spam
Please do not flood the community with nonsense. Actual suspected spammers will be banned on site. No astroturfing.
4) NSFW is okay, within reason
Just remember to tag posts with either a content warning or a [NSFW] tag. Overtly sexual posts are not allowed, please direct them to either !asklemmyafterdark@lemmy.world or !asklemmynsfw@lemmynsfw.com.
NSFW comments should be restricted to posts tagged [NSFW].
5) This is not a support community.
It is not a place for 'how do I?', type questions.
If you have any questions regarding the site itself or would like to report a community, please direct them to Lemmy.world Support or email info@lemmy.world. For other questions check our partnered communities list, or use the search function.
Reminder: The terms of service apply here too.
Partnered Communities:
Logo design credit goes to: tubbadu
view the rest of the comments
Factory tuning is done the way it is for fuel compatibility, engine and component longevity, and a wide range of consistent performance at any reasonable altitude.
Changing the timing of the ignition, altered valve timing, and changing to a higher octane fuel can give you more power and better crusing economy at the cost of longevity, not being able to use a lower octane fuel, and possible issues if you drive at an altitude far different than the one it was tuned at.
Higher octane fuel shouldn't give you any more power; it just prevents pre-ignition. If your engine is very high compression and needs high octane fuels, then usually something like an anti-knock sensor is going to be present to cut engine performance--retard timing, I think?--if you have the wrong fuel in your car.
OTOH, a less energy-dense fuel like pure alcohol can increase power because you can increase compression in the engine even more than you could with high grade gasoline. That means that you can get more benefit from turbo- or super-charging.
IIRC, most fuel injected cars can now make some kind of adjustment to the fuel:air mix if you're at high altitude so that it shouldn't be an issue (unless you're at altitudes outside of their range of adjustment). Carbureted engines can not do that.