Because a higher octane rating is going to take more time to detonate after the spark, you can advance timing safely to produce more power. If you advance timing with regular gas, the lower octane gas will ignite before Top Dead Center, causing knock. That's just what exodus was trying to say.
Higher Octane = Harder to detonate = More delay between spark and detonation = less volatile.
I leased Pontiac Wave from September 2006 to August 2011.
lol thank you...i noticed that you posted whilst i was posting lol. i had a couple discussions with peers and it definantly helped and your explanation is the best so i applaud you. lol i guess my argument is...how many pony's are you actually gaining...and is it really worth the xtra 20-40 cents a gallon in gas.Originally Posted by exodus
on a side note i've lost alot of respect for ppl that claim they know about cars that really go to a shop and think that every performance part is gonna give them a set X amount of horse. but i'm come to find that really to gain that power you have to have it running with something else and have the engine balanced in a sense...
Simply advancing ignition timing and using a higher octane fuel may or may not give you extra power (anyone care to chime in on this one...)... it will however give you your power quicker.
whether or not it's worth the extra money depends on the driver and situation. If you're a competitive auto/rallycrosser who doesn't want to spend 6Gs on a short ratio gear set, then I'd say yes.
Horsepower is how fast you hit the wall. Torque is how far the wall moves after you hit it.
ya know thats interesting that you mentioned that becuz i was having a pretty heated debate with a friend about how it produced power and i was arguing that it would only increase acceleration not actual power. since higher octane fuel as the same amount of btu's as a lower octane fuel. and i was thinking about how you could get more power by having more burn time of the fuel. but it seemed to really contradict itself as you have more time..but a slower burning fuel rather than a shorter time and a shorter burning fuel. lol honestly i really want to experiment and see how much faster lower octane fuel burns in comparison to higher octane...i need to do more research on this.
so you guys are saying taht all we have to do is avance our ignition timing and switch to higher octane and we make power? i dont think so
Ummm.....no. That's not what they're saying. Are you actually reading the words or just looking at the screen blankly?
Simply advancing ignition timing and using a higher octane fuel may or may not give you extra power (anyone care to chime in on this one...)... it will however give you your power quicker.
While advancing the ignition will give you slight gains, it will also increase the combustion temperatures and increase the risk of predetonation, which a higher octane fuel can help fend off.
On the other hand, once you turbo a car, you will need to retard the timing a bit since the compressor will heat up the air and cause detonation. The retarding of the timing DEFINATELY decreases power so a higher octane fuel allows you to keep it.
For example, I was pulling about 14 degrees of timing at 17psi on my Subaru, but at 5psi I didn't have to pull any at all. 17psi was the max boost I could make power, anything above that I had to pull even more timing which decreased the power so it was no longer worth adding boost.
Ummm.....no. That's not what they're saying. Are you actually reading the words or just looking at the screen blankly?
Simply advancing ignition timing and using a higher octane fuel may or may not give you extra power (anyone care to chime in on this one...)... it will however give you your power quicker.
lol well it took a while for that to actually come out. most ppl were saying it added power instead of increased simple acceleration... lol i'm actually glad this came up..i know that much more about engines.
Does anyone think it's popular for kids in japan to put USDM parts on their cars?
I heard some cars they do... like their verson of the Scion
Posting Permissions
LinkBack URL
About LinkBacks
Reply With Quote
2006 Chevrolet Aveo