Hey Guys,

Has anyone put in 100 octane gas on our E63 with TT? I was wondering if:

1: Will this hurt the car for street driven and not track driving.

2: Does it make a difference with 91 or 100 octane during street driving ?

3: Is it worth the try?

Thanks for your input.

 

it will always make more power on higher octane. if you use 100oct the stoich value is close to pump gas so air fuel will be fine.

 

i just put 98 octane in mine, if i want that lil extra umph i just add octane booster for the street

 

1. No
2. Not a bit, except driving costs more per gallon
3. Only if you want to pay more $ per gallon

There are hundreds of articles like this one but this is a short one :

http://www.motoring.com.au/advice/20...ar-faster-7513

That being said, you might need higher octane if your chipping has raised boost pressure and you are running higher compression ratios. Especially if you ever have had a "knock" or more correctly predetonition. Odds are, that the change is such that 91 RON is fine. and it's not needed. It definitely is not needed on stock.

There can be a difference in performance and engine wear between Top Tier Gas and gas from retailer chains and gas discounters that bid lots on the market. That is all about the additives and detergents.

http://www.autoguide.com/auto-news/2...-gasoline.html

From a performance standpoint, you are far more likely to gain performance by dropping weight by not filling the tank completely. A 20 gallon tank filled only to 10 gallons drops about 70 lbs in weight from the car. Most engineering calculations and speed testing is done with 1/2 full tanks (like Nürburgring runs). Engineers can struggle to drop 125 lbs from a car's frame/weight. The difference in weight is more noticable on performance with lighter sports cars (think Ariel Atom) than big ***** like ours.


* In track parlance- Fat Azzed German Sedan

 

not if the car doesn't knock on 91/93.

 

Thanks Guys. I'll stay with Mobile 91.

 

100 octane will make more power in modern engines. They will advance the timing automagically as they adapt to their fuel. Even little Civic engines make a little more power on higher octane.

 

How much more power are we talking on a stock e63S engine?

 

3-5whp more u get with octane booster i know that.

 

And 100lb weight reduction is good for 5-8 whp (i.e. Running on 1/4 tank)

 

Can you produce a dyno chart, from a modern passenger car with a production engine meant to run on regular or premium gasoline, that shows horsepower gains based upon fuel grade ( running higher octane or added octane booster) alone?

Would love to see one.

 

They exist, just google or YouTube and you'll find them.

 

All I could find

 

Their STI made 26lb/ft more, going from 95 to 98 octane.

So yes they do make more power, even small stock motors. Turbo cars benefit the most though.

 

( RON Octane Rating x 0.95 = AKI Octane Rating )
98 RON Octane x 0.95 = 93.1 AKI Octane (US measure)
100 RON Octane x 0.95 = 95 AKI Octane (US measure)

The video shows that car one designed and recomended to run on regular octane gains no HP going to higher octane.

The STI (designed to run on premium 93 AKI/98 RON) loses HP running on regular. This is expected, as the knock sensors and ECI algorithm will retard timing to avoid engine damage if the wrong fuel (regular) is put in. It makes more HP on the correct premium grade fuel (98 RON=95 AKI Octane). It is stated in the owners manual.

If tested on 100 AKI Octane ( @105 RON) you could expect the STI to show the results seen with car 1 when going from 95 RON (90 AKI Octane) to 98 RON (93 AKI Octane). No HP increase whatsoever.

The E63 is designed to run 96 RON minimum in US spec (91 AKI Octane) to meet Cali standards. In other states, 98 RON (93 AKI) is available. I have also seen 95 AKI Octane and 100 AKI Octane.

Unless the AMG engineers were incompetant (they are not), you could expect that running your car on 87 AKI would result in spark retardation and a drop in HP to prevent knock. Same dyno results but since it is a percentage decrease the absolute HP numbers would be higher. Running your car on 100 AKI-see results for car one above.

 

I'll find a dyno video, that shows a stock Civic SI making more power with higher than rated recommended octane.

Not all cars will make more power, it all depends on their ECU adjusting to the fuel, but I imagine all modern turbo cars will make more

 

I've ran 100 with my biturbo e63 before, and it defiantly feels much stronger. I'm only a p30 car, no flash. The citgo across from Eurosport in bensenville on irving park rd sells 100 octane. Its $6.99, for you Chicagoans. Only mod i have is Speedriven downpipes....

 

renntech rear diffuser adds 48hp...oh wait u got it already...strong work