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Board: Porsche - 911 - 997 - Turbo
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Re: Gasoline Problem
Quote:
intouch1 said:
Hi everyone,
we only have 95 octane gas in our country. how many bottles of over the counter octane booster should i add to my tank to come up to the recommended 98 octane ????
octane boosters will only add a few points: (1 point = 0.1 octane point) and I think the most powerful ones will add 15 points or so which will bring your 95 octane to 96.5 octane.
Not worth the risk in my opinion.
Re: Gasoline Problem
Quote:Agree - many US cars run just fine on 91 octane (suggested octane of 93) - the ECU adapts to the lower ratings.
AAHTT said:Quote:
intouch1 said:
Hi everyone,
we only have 95 octane gas in our country. how many bottles of over the counter octane booster should i add to my tank to come up to the recommended 98 octane ????
Not worth the risk in my opinion.
Re: Gasoline Problem
You don't need to add much. I put a can of ST104 in my tank one day (I had it leftover from when I really needed the stuff for a turbo) and it made a significant difference. No more of that nearly stalling sound when nearly stalling it. In fact, it's a lot harder to stall it with that in it. I suspect that the Variocam is adjusting itself so far out to handle our crappy gasoline in California that it weakens the nengine to the point of stalling,--nearly. What a difference it made. If I were racing it regularly I would top off the tank with that,--or aviation gas.
dan
dan
Re: Gasoline Problem
Quote:
roadtrip said:
wouldnt do it either...95 oct consider youself lucky 91 is the standard around here but the tt runs great on 91vpower
You may not be comparing apples with apples. In Australia the top regularly available fuel is V Power Racing with a RON number of 100. If the same fuel sold in the US the rating would be around 95 or 96. The following is from Wikipedia:
The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel through a specific test engine with a variable compression ratio under controlled conditions, and comparing these results with those for mixtures of isooctane and n-heptane.
There is another type of octane rating, called Motor Octane Number (MON) or the aviation lean octane rating, which is a better measure of how the fuel behaves when under load. MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, a higher engine speed, and variable ignition timing to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern gasoline will be about 8 to 10 points lower than the RON. Normally fuel specifications require both a minimum RON and a minimum MON.
In most countries (including all of Europe and Australia) the "headline" octane that would be shown on the pump is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, this means that the octane in the United States will be about 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, would be 91-92 in Europe. However most European pumps deliver 95 (RON) as "regular", equivalent to 90-91 US (R+M)/2, and even deliver 98 (RON) or 100 (RON).
Re: Gasoline Problem
Quote:
intouch1 said:
the problem i was referring too is that 'our' 95 octane equals US 88 or 89 octane. so its the minimum required by Porsche.
However, I want to extract maximum performance from my car.
How many bottles of the booster must i add to my 62 l tank ?
I've used octane booster in previous cars and I don't like it. You have to use a hell of a lot to notice even the most minimal difference, it's quite toxic and unhealthy to be around, and it's expensive.
If you live near an airport you may be able to get Avgas (DON'T use Jet A1; it's kerosene!!). I used to buy it years ago and it was available in 100 and 130 octane (RON) as I recall. At another time my local gas station was able to order in 44 gallon drums of 100 octane race fuel for me, from which I would fill my car using a hand pump which screwed into the top of the drum. That actually worked pretty well, and they would just keep a drum or 2 in reserve. Maybe that option is worth checking out? My advice would be to avoid regular use and handling of off the shelf octane booster.
Naturally you should talk to the service manager at your Porsche dealership or seek some other opinions before doing anything too extreme.
Re: Gasoline Problem
Quote:
intouch1 said:
the problem i was referring too is that 'our' 95 octane equals US 88 or 89 octane. so its the minimum required by Porsche.
However, I want to extract maximum performance from my car.
How many bottles of the booster must i add to my 62 l tank ?
If your octane level equals US 88 or 89 you are below Porsche' s required octane level in the US (91-93).
You should check with your dealer to find what is the minimum recommended level. You may find higher octane in private aviation gas, but do check with your dealer because your ECU may be biased to the low value available in your country and its range may not go as high as aviation (say US 100).
Re: Gasoline Problem
Quote:
intouch1 said:
the problem i was referring too is that 'our' 95 octane equals US 88 or 89 octane. so its the minimum required by Porsche.
However, I want to extract maximum performance from my car.
How many bottles of the booster must i add to my 62 l tank ?
your 95 octane does not equal 88 octane in the US, it equals 91 so you're fine.
for extracting max performance, you need real high octane fuel (race gas). maybe you could buy some online and have it shipped to egypt
.
Re: Gasoline Problem
Some octane boosts contain MMT which can be harmful to the 02 sensors and cats above a certain concentration. You may cause more problems down the road if you dump in multiple bottles of MMT laden boost.
http://www.epa.gov/otaq/regs/fuels/additive/mmt_cmts.htm
http://www.epa.gov/otaq/regs/fuels/additive/mmt_cmts.htm
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