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I figure higher octane is better for my car at any rate. Anybody know a place in san diego to fill up with higher octane? The norm for premium here is 91, that's pretty low. How about octane booster? Worth it? Since I run at 91 octane, if I found octane booster claiming a 7 octane boost, will it work the same way as if I found a place using say 98 octane? I run my car from full to maybe 50 miles to the tank left till I fill up to full again, if I use octane booster, any special tips on how to get all I can out of it. (get it to mix a dilute best)<BR><BR>
[Modified by biggerhurt38, 5:57 PM 12-15-2002]
 

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Re: higher octane (biggerhurt38)

When octane booster says 7 points it means it would take you from 91 to 91.7........its not worth crap.<br>
 

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Re: higher octane (mrmandmman)

98 is quite easily available over here (they call it super unleaded), but I've heard that makes the car run very hot.<p>Is this true?<p>Can you really notice a performance difference between the two?
 

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Re: higher octane (topless_tart)

i have 104 unleaded in my car right now.<p>don't worry i got it for free, but i wanted to see what it's like on a stock-boost application.<p>The only real differences is less city mpg, better hwy mpg and much better downshift throttle/boost response.<p>I know BSR_RCKT runs 100 on a constant basis, but hey when you've got pretty much everything that can be bolted on to that badboy, why not go with the safe and effective fuel.<p>In all reality, it should definitely not run hotter and if anything will keep your turbo car from pinging. under load or high heat.<p>Lots of people i know in SoCal run 100 during the summer even on stock boost cars to be safe.
 

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Re: higher octane (topless_tart)

Your engine is designed to use 98 it will consume less, and give more perforrmance, better trotle response. <IMG NAME="icon" SRC="http://********************/smile/emsmile.gif" BORDER="0">
 

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Re: higher octane (BenES)

So where do we find it!?! <IMG NAME="icon" SRC="http://********************/smile/emsmile.gif" BORDER="0">
 

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Re: higher octane (Kaizai)

The highest I have seen in CA is 91 also, I'd love to find something higher to use on a daily basis.
 

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Re: higher octane (topless_tart)

I'm not sure if it runs hotter with higher octane. But i will say this: My car will ping at about 17 or 18 with 93, but with 100 unleaded race, i can go 20+ and its stays very smooth. Higher octane should resist detonation.
 

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Re: higher octane (mtbman11)

<BLOCKQUOTE>quote:<HR>The highest I have seen in CA is 91 also, I'd love to find something higher to use on a daily basis. <HR></BLOCKQUOTE><p>there is a shop in my area selling 100 and 103(or sumthin) octane... at least they used to.<p>cost about 5 bucks per gallon back then.. when regular prices were 1.25 for premium... <p>not sure about now. or if they still sell it, i dont see the sign saying they had racing fuel anymore
 

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Re: higher octane (GShyneDM)

For unleaded 100, its about 2.95/gallon, here anyway. Leaded 108 is about 4.95/gallon, i think. Make sure you get unleaded (unless u want an excuse to buy a new cat <IMG NAME="icon" SRC="http://********************/smile/emwink.gif" BORDER="0"> )
 

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Re: higher octane (biggerhurt38)

I'm not sure if you are familiar with Audiworld but on that side of the fence, APR makes a ecu upgrade that lets the driver use the cruise control stalk to adjust the program in the ECU. stock, modified and race (100 octane fuel). They may have dyno graphs on their website ( <A HREF="http://www.goapr.com" TARGET="_blank">http://www.goapr.com</A> ). You could also do a search in the S4 forum for 100 octane and see what kind of results folks have been getting.<p>You car can run hotter using 100+ octane fuels. Fuel additives, like 104 Boosters, etc, may help with occassional detonation (pinging) but don't expect significant HP gains. If you want to take advantage of performance mods and get more power you need a true 100 octane. Although I have heard that adding Theuline (sp?) - available from a paint supply store can offer some benefits.<p>100 octane is overkill for dailying driving. 93/94 should do the trick unless you are really modified but then you are getting into fuel delivery discussions at that point.<br>
 

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Re: higher octane (83caddy16v)

<BLOCKQUOTE>quote:<HR> ......may help with occassional detonation (pinging) .........<HR></BLOCKQUOTE><p>Please can somebody educate me???<p>I'm not very smart... <IMG NAME="icon" SRC="http://********************/smile/emsad.gif" BORDER="0">
 

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Re: higher octane (topless_tart)

It's when the fuel/air mixture in the cylinder combusts before the spark plug fires, usually because of high temps caused by high compression or high boost. Not good for an engine. The higher octanes are supposed to be better in not combusting until the spark fires.
 

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Re: higher octane (c70pusher)

some folks might call it pre-ignition. I blew a out the fire ring cylinder #3 on my headgasket in my VW last year from detonation. Basically there were small explosions happening on the top of the piston and eventually these explosions blew through the metal ring in the head gasket and ultimately allowed the head gasket to fail. <p>The problem was that my #3 fuel injector was not delivering enough fuel, creating a very lean condition as compared to the other cylinders.<p>If you use low octane fuel, say 87, and have a car that requires 91, you may hear slight detonation until the knock sensor retards the timing to compensate.
 
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