[HawgToth330]

Anyone ever use Hyperfuel Octane Booster in their BMW?

Live Easy, Drive Fast!

[AWD Addict]

xylene.

[Tom K.]

Why? Unless your motor is tuned for it, there is no performance benefit so anything above 91 is a waste of money.

Tom

[Blubaron79]

Originally Posted by Tom K.

Why? Unless your motor is tuned for it, there is no performance benefit so anything above 91 is a waste of money.

Tom

The minimum requirement is 91. I thought if you used a 93, compared to a 91; you'll see a difference. I could be wrong.

[Tom K.]

Originally Posted by Blubaron79

The minimum requirement is 91. I thought if you used a 93, compared to a 91; you'll see a difference. I could be wrong.

Check your manual. 89 is minimum (some possible timing retardation under extreme conditions) with 91 being recommended for your 335i.

While I use 93 in both my 128i & 328i as 91 isn't locally available, I've noticed no difference whatsoever when running 91 in the midwest & west; either in fuel economy or perceived power.

Like I said, save your $$.

Tom

[Bobble]

Personally would not run octane booster in anything. Leaves a nice residue all over the components, almost rust colored, and you need to run a ton of it to make any movement in the octane factor. Waste of money IMO. If you want higher octane find higher octane fuels to start.

[4DR Assassin]

On an NA car, probably won't notice much if any difference. On a turbo car, you might see some difference in timing. Especially at the onset of boost in a car not tuned for race gas.

As for Octane Booster, those "boosters" you get from Autozone or the like....not much gain if any. Only "Octane Booster" i've ever used that worked is the Torco Accelerator

http://torcoracefuel.net/1-pix-torco...or-bottles.jpg

It would come in handy when I wanted to run my 100 octane tune on my S4 with short notice. One 32 oz can would make 10 gallons of ~100-102 octane out of 93 octane unleaded fuel. Downside is as Bobble said, it will leave a kind of copper/rust color residue on components in the combustion chamber.

[ABerry]

kinda random.. but do all states have 10% ethanol in their gas? I feel it is so damn high here in Oregon

[Titanium3Series]

Originally Posted by ABerry

kinda random.. but do all states have 10% ethanol in their gas? I feel it is so damn high here in Oregon

I think so for the most part.....our pumps in georgia also state up to 10% ethanol, but it just states that it may contain up to 10%.

[Bobble]

Ethanol values vary even within the stated values on the pumps. If you're bored and want to be scared to death about the quality of your fuel research it on the internet. Lots of info on variances being above or below the stated values. Excessive ethanol is a concern for the longevity of seals and such. On the bright side you can use additives to lubricate your fueling systems and top cylinder components to counteract high ethanol content.

[Legion5]

Originally Posted by HawgToth330

Anyone ever use Hyperfuel Octane Booster in their BMW?

Live Easy, Drive Fast!

Octane booster is usually unreliable and shoddy, just get racing gas if you want higher octane.

Originally Posted by Tom K.

Why? Unless your motor is tuned for it, there is no performance benefit so anything above 91 is a waste of money.

Tom

Our engines auto tune unlike 95% of cars out there. High octane gas isn't a waste. The bad news is from my engineering training I learned that the effect of going up a bit in octane is about the same difference as between getting gas from different stations (which can vary a few % in performance), so really it's not even guaranteed to be better and not really worth it unless it's only a few cents more.

[dcat151]

Originally Posted by Titanium3Series

I think so for the most part.....our pumps in georgia also state up to 10% ethanol, but it just states that it may contain up to 10%.

Yeah, I think all of the ones I've been to locally are watering down the gas with 10% ethanol.

[tony176000]

OH, I though everyone knew that you get about a 1.89% increase in power for each point of octane you go above 91...

[Tom K.]

Originally Posted by Legion5

Our engines auto tune unlike 95% of cars out there. High octane gas isn't a waste.

Source?

I ask because if that is the case, then why doesn't BMW claim increased power & economy using octane above 91 AKI? They quote a reduced peak power rating when running a BMW R1200RT on 87 vs. 93, but no increase above 93.

The only "auto tuning" I'm aware of is the knock sensor and resultant timing retardation when necessary.

Tom

[Tom K.]

Originally Posted by dcat151

Yeah, I think all of the ones I've been to locally are watering down the gas with 10% ethanol.

This site is quite interesting (not sure how often it is updated). If it is correct, my nearest corn free gas is about 100 miles away. But it seems like you have a few more options in GA.

http://pure-gas.org/index.jsp?stateprov=GA

Tom

[idrift4wd]

Originally Posted by Tom K.

Source?

I ask because if that is the case, then why doesn't BMW claim increased power & economy using octane above 91 AKI? They quote a reduced peak power rating when running a BMW R1200RT on 87 vs. 93, but no increase above 93.

The only "auto tuning" I'm aware of is the knock sensor and resultant timing retardation when necessary.

Tom

Tom. 93 will make more power then 91.

just like race gas (100+ OCT) will make more power then pump(93 and lower)

its common sense.

[ceb]

Commonly available octane boosters will increase octane by a couple of points. There are 10 points in one octane rating, so to go from 91 to 92 octane you'd need to raise the octane by 10 points.

Adding octane boosters is much more expensive than buying higher octane gas in the first place.

[TotalPower]

Originally Posted by idrift4wd

Tom. 93 will make more power then 91.

just like race gas (100+ OCT) will make more power then pump(93 and lower)

its common sense.

Octane is a measure of a gasoline's ability to resist auto-ignition, auto-ignition can cause engine knock.

Vehicles are designed and calirated for a certain octane value. When an vehicle uses octane level lower than that required, knocking may result therefore our engine are "tuned down" or simply retard the timing so to not lead to severe engine damage.

This does NOT mean that using higher octane will cause your vehicle to Tune-UP beyond the point that your engine was calibrated to.

Our cars are calibrated to 93 octane I believe. Anything more than that w/o a tune (jb3, piggy back, etc) is a complete waste of money.

[dcat151]

Originally Posted by Tom K.

This site is quite interesting (not sure how often it is updated). If it is correct, my nearest corn free gas is about 100 miles away. But it seems like you have a few more options in GA.

http://pure-gas.org/index.jsp?stateprov=GA

Tom

Interesting. It looks like the only one near me is at the marina, but maybe there will be more before too long.

[PINeely]

Octane booster is bullshit. Buy race gas.

There are plenty of dynotests that show 100 octane fuel making significant power over pump gas.

Most stations around here sell 93 octane.

[tony176000]

Originally Posted by idrift4wd

Tom. 93 will make more power then 91.

just like race gas (100+ OCT) will make more power then pump(93 and lower)

its common sense.

AKA the enemy of science and educated thought.

[Bobble]

Originally Posted by dcat151

Interesting. It looks like the only one near me is at the marina, but maybe there will be more before too long.

Same in Cali. Need to find a boat marina or race fuel place if you want higher than 91 and no ethanol what so ever. Fuel conditioners do however counteract the drying effect of ethanol on your fuel delivery systems.