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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 06-17-2013, 05:07 PM   #1
Mddicted
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95 Octane Joy Ride

Added 9 gals of 100 octane unleaded and topped off with 91 - Full tank of roughly 95 octane and the concensus optimized octane for the factory tune. Cannot afford to do it all of the time but sure is an extra kick in the pants once in a while!
Highly recommended.
Mike
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Old 06-17-2013, 05:45 PM   #2
Alaska
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Where are you reading that 95 is optimum on a factory tune? Just curious. I really have no idea but would like to know.
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Old 06-17-2013, 06:09 PM   #3
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I copied this post below from the M5/M6 boards, I have seen similar reports on other forums for other BMW engines. It is definitely a seat of the pants difference in performance. Opinions differ on what ratio is required to achieve 95 Octane, I use basic math and figure I am close with 9 gals of 100 in a full tank.

"High octane gas / Trick Gas
I did a search and didnt come up with anything so here you go for sharing.

When I had my E39 M5, we experimented with higher octane gas.
We learned a lot so I thought I'd share it here too in case some of you are not aware of this.

Summary:
On E39 M5's S62 motor, we learned that the engine loves higher than 92 octane gas.
We learned that if we add 5 gallons of 101 octane then fill up the tank with 92 octane super unleaded gas - the BMW engine becomes really happy.

Acceleration is much smoother, throttle response is much quicker, the engine simply runs better with higher octane gas.

95 octane is pretty much it. Anything higher than 95 is a waste /no additional benefit.

So I have been trying 5 gallons of 101 octane to my M6 for a while now and I tell you - whoooaaaa!
The V10 S85 engine just loves it too.

I caution you - trick gas is addicting!

Hope that helps some of you."
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Old 06-17-2013, 08:07 PM   #4
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93 Octane all the time FTW.
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Coming Soon: Open to suggestions


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Old 06-17-2013, 08:11 PM   #5
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I get 92/93 depending where I'm at. Chevron usually has 93 available and shell is typically 92.
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Old 06-17-2013, 08:23 PM   #6
Dreamliner330
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I can't find over 91.
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Old 06-18-2013, 06:50 AM   #7
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I fill up with 94 octane here, unfortunately it has "up to" 10% ethanol -_-

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Old 06-18-2013, 08:46 AM   #8
Inflame
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93 is no problem here in Michigan, some Sunoco have 94.

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Old 06-18-2013, 08:58 PM   #9
Charlescrs6
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Never put anything except for 93 in here in CT. Us east coast guys at least have something going for us!
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Old 06-20-2013, 12:22 AM   #10
illestminimike
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95 Octane Joy Ride

I'll try this next track day.
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Old 06-23-2013, 12:51 AM   #11
aaronstarr
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i wish someone would just break down and do a dyno comparison. when i first got my car (e46 m3)it had very cheap gas in it and kept pinging so i put 3.5 gallons of c12 race fuel in to bring the octane up the mixture was enough to bring the octane way up but not really mess with the cats to bad. either way it sounded more aggressive and felt like it was pulling the front end up. Ive tried this in a 05 audi s4 4.2 as well and results were similar..
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Old 06-23-2013, 01:35 AM   #12
Steve///M
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95 Octane Joy Ride

There was a dyno study on the E46 M3 by either Turner Motorsport's or Jim Confortti, not 100% sure who, but they found that there were significant WHP gains by using up to 96 octane. The car would self adjust timing advance and retard automatically, anything higher than 96 would not yield any additional benefits. This was based off of a stock E46 M3.


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Old 06-23-2013, 01:43 AM   #13
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nice. i wonder how quickly it adapts and advances timing and what the perfect formula in mixing fuels would be for maximum results?
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Old 07-01-2013, 06:11 AM   #14
Steve///M
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95 Octane Joy Ride

Quote:
Originally Posted by aaronstarr View Post
nice. i wonder how quickly it adapts and advances timing and what the perfect formula in mixing fuels would be for maximum results?
Theoretically it would depend on your method of mixture and the time it would take to clear the lines and fuel rail of old gas. Say for example you were to put five gallons of c16 in first on an empty tank and then fill it with 92, that alone would obviously mix the fuel enough to where you wouldn't have to drive like an idiot trying to slosh the fuel around. The ECU will begin adjusting timing as soon as the car is started to optimize performance and reduce any chance of ping or knock. As far as max octane/mixture for best performance, going higher than 96 octane is pointless on a stock tune as you won't see any gains past that. Now if you have a programmer, shark ECU injector, or a nice evolve tune then you may yield more gain with higher octane than 96, either way be ready to watch you temp gauge run hot!!!


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Old 07-01-2013, 12:07 PM   #15
aaronstarr
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thats an untrue myth btw race fuel burns slower and colder if you were running thick aluminum spacers on the throttle bodies it would be freezing cold to the touch or form ice c16 is a very slow burning fuel that mixed with high velocity air would not cause the engine to run hot ive tried this and seen it on high comp 1000 hp cars....87 oct burns quicker and hotter temps and nitro meth is just ferocious lol
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Old 07-01-2013, 02:28 PM   #16
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My father was a pilot and kept his Cessna 172 at a small local airport, as a teenager, I regularly purloined a number of gallons of 100 octane avgas to add to Trans Am gas tank..........lol...good memories ........

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Old 07-01-2013, 04:43 PM   #17
MathewM3
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F.Y.I they actually have 98 octane available at gas stations in Europe (Germany and northern Europe, not sure about the rest of the continent).
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Old 07-01-2013, 05:32 PM   #18
//Maxwelljuppercut
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110 "racing fuel" is available at a few gas station by me
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Old 07-01-2013, 05:36 PM   #19
Elvin123
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95 Octane Joy Ride

Haven't even touched anything less than 93


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Old 07-02-2013, 12:03 AM   #20
Mddicted
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Quote:
Originally Posted by //Maxwelljuppercut View Post
110 "racing fuel" is available at a few gas station by me
Be careful with 110, at least here in Socal it is leaded and will destroy the cats. They register who they sell it to here and it must be used for track purposes only.

Our premium is only 91 no matter where you go.

I have heard they use a different method to calculate octane in Europe and that is why the numbers are higher.
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