I was wondering if i would have to have a tune to run 100 Oct ? They actually have VP 100 Oct. on tap at the Gas City near me, but i am a little skeptical about putting it in. I really don't feel like blowing any thing up or ruining my drivtrain. Any of you older guys know what the deal with it is. Its like $4.99/gallon which is a little pricey for a mistake.

 

no it wont blow you up, and unless you have decent mods, running high boost you dont need it.. its fine to run as long as it is not leaded..

 

It won't hurt anything; it's not leaded. It's actually very good if you can raise your boost and tune for it, but just using it randomly won't be of any help. Don't waste your money unless you can make use of it, and believe me, it can make a HUGE difference with the proper settings. Way back before you showed up, I was running 12.2s with a cat-back, mbc, and safc on a mix of 104/93oct. The knock resistance is huge compared to straight 93oct, which allowed me to run leaner while also running 23-24psi with no knock.

 

Cool hey thanks guys ! I guess i'll wait till i am a big boy and can make some use of the juice. I was gonna go the Flash then later on AEM EMS route, so i guess it would be best to wait.

 

You'll notice it more on the top end, but to take full advantage of 100 you'll need some kind of engine management that can accomodate two maps. For example, on my 100 map the boost isn't where it could be (boost tables are at 100% but I only hit 22.5 psi in 4th) but man the ignition advance you get to run in that car makes it so fun to drive.

I chose the XEDE as my solution, but there are many more available.

 

The real truth of octane is explained in terms of how it burns and why it is used.

Higher octane gas does not explode more violently, more quickly, burn significantly hotter or add power in any way shape or form.

High octane is used to RESIST explosions inside the combustion chamber. By that I mean it does not ignite prematurely and burn unevenly when the mechanical limits are increased, in essence more BOOST, high compression, advanced timing.

Lower octane levels will ignite prematurely, burn unevenly and at dangerous inervals, is essence working against the engine that is trying to make good use of a specific timed explosion event. By igniting and EXPLODING before the ignition event is decided to take place, damage to parts occur. By using high octane fuel, the user can increase the physical performance and mechanical stresses by maintaining a consistent burn and not being concerned about a "dirty" explosion happeneing too early, (before the specific measure of timing occurs and the ignition unexpectedly occures due to the contaminants of the fuel in the low octane measure fuel cause it to ignite).

I guess thats just blabbing but it made sense when I was thinking it,.

Basically low octane fuel is volatile and explodes. High octane fuel is resistant to heat and pressure so it burns cleanly and evenly allowing more power to be extracted from a motor without fear of damage. That was easy

 

No sir your are completely not babbling (trust me i have a tendancy to do it). Thank you very much for the information it makes some stuff very clear for me thank you !

 

I just hope Im accurate. Its been a long time since Ive studied, but that is the basic jist of it.

High octane fuels allow for the mechanical effeciency of an engine to be maximized by increasing compression, boost, timing advance. Essentially you have to TRY to make that fuel burn much harder, and in turn are generating more power due to the effeciency of the engine package making better use of expelled energy.Lowering boost, compression, timing advance will allow for cheap fuel to be used, less power to be made but a less knife edge solution.


I think that is a little bit less of a roundabout answer.

 

If you aren't running anything to tune your car, you only need maybe 94-95 octane. it would be a waste to fill your car on 100, use the 100 octane and mix w/ 92,91,93(whatever you have in your area) to get 94,95. your car will run much different on that alone cause the ecu will sense the difference and adjust.
I am so jealous of the midwest, and east coast where their premium is 94 octane.

 

Actually we get 93 as standard issue, and Sunoco is the onlt 94 octane that is available widely. Down by Englishtown which was close to where I lived had all types of fuels on tap for general consumption. Its by far cheaper to run alcholhol.

 

$4.99 A gallon?!?!? Where's this at? I've been paying $5.99 a gallon at the 44th Street and Chandler station.

 

Anyone? Bueller, Bueller, Bueller...

 

No kidding. That's a good price. Where's this Gas City you speak of?

 

so basically... running 100 oct fuel isnt bad, its just pointless for the price if you dont have that many mods?
im willing to try it just cuz i can, there's a bp station around here that sells 100 oct, dont know what price tho

 

Prettymuch, you might get a tiny tiny gain but nothing you're really going to notice, and it will also probably take your ECU some time to adjust to it before that tiny tiny difference even kicks in.