Standard Unleaded in Euro

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Originally Posted by V205

Putting power output aside:

If the higher octane is able to get more mileage that equates or betters the cost value, then it's worth it in terms of less time going to the stations?

ie. If they made a fuel that cost me a mth's normal fuel pump price but allows me to only need to pump once a mth, why not? :)

As mentioned be others, the extra octane is insurance against extreme conditions that cause pinging like very hot days and sudden acceleration needs going uphill

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For the Euros which were specced to run with 95 octane, 98 is good enough insurance already. :)

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Originally Posted by V205

Putting power output aside:

If the higher octane is able to get more mileage that equates or betters the cost value, then it's worth it in terms of less time going to the stations?

ie. If they made a fuel that cost me a mth's normal fuel pump price but allows me to only need to pump once a mth, why not? :)

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This is from a test they did on TV (today's tonight or smthg similar) a while back. Basically they are comparing the 98, 95, 91 ron, 5% ethanol, and 10% ethanol. The test is done on the same car brand and model (but of course not necessarily the same timing etc because the ecu might have slightly different mapping) running constant (60 kph if not mistaken). To my surprise, car with 98 ron went out of gas first, followed by 95, 91, 5% ethanol, and lastly 10% ethanol. Now this somehow proves that 98 ron doesn't give you the extra milage? The cars they use to test are commodores.

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Originally Posted by euro77

This is from a test they did on TV (today's tonight or smthg similar) a while back. Basically they are comparing the 98, 95, 91 ron, 5% ethanol, and 10% ethanol. The test is done on the same car brand and model (but of course not necessarily the same timing etc because the ecu might have slightly different mapping) running constant (60 kph if not mistaken). To my surprise, car with 98 ron went out of gas first, followed by 95, 91, 5% ethanol, and lastly 10% ethanol. Now this somehow proves that 98 ron doesn't give you the extra milage? The cars they use to test are commodores.

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lol read the previous few pages....higher rated fuel gives less power so the engine has to work harder and will thus use more fuel...that was half the point of what i was saying dude

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Originally Posted by Mr_will

lol read the previous few pages....higher rated fuel gives less power so the engine has to work harder and will thus use more fuel...that was half the point of what i was saying dude

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so are you saying that if the the test was done on a car that has ecu which can advance its timing based on the fuel, you'd get more milage from ron 98?

also, since we are on this timing topic, aftermarket air fuel controller, if tuned when running 98 ron, surely would give the right timing, thus giving more power and more milage?

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Originally Posted by euro77

so are you saying that if the the test was done on a car that has ecu which can advance its timing based on the fuel, you'd get more milage from ron 98?

also, since we are on this timing topic, aftermarket air fuel controller, if tuned when running 98 ron, surely would give the right timing, thus giving more power and more milage?

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i understand what youre getting at - but youre not quite expressing it in the right way. heres how it works -
take my LS integra for example. it aint putting out huge amounts of power, so to get decent acceleration i need to rev to 3-4 (normal-ish driving)

HOWEVER if i was to get myself a turbo conversion (setting aside the particulars of where turbo power arrives in the rev range, it doesnt matter if the power increase comes from cams, turbo, super whatever, its just not relevant for this argument) -

then if all i wanted was similar acceleration, i wouldnt need to rev as high to get the same power level, and thus it would be reasonable to assume that id use less fuel (and its important to take into account that the fact that im making more power means that more fuel will being injected into the cylinder in every injection cycle, however this effect will be less than the amount of fuel that wouldve been used had i had the need to rev higher)

SO if what youre aiming for is mileage, then advancing timing and using 98 ron as opposed to 95 or 91, then the fact that your power is arriving earlier and potentially you are getting more of it, then youll need to rev less and as a result youll use less fuel and get more mileage

however if power is your aim, things are a little different. considering that you will need to rev lower to get the same power as you were getting before (and obtain similar acceleration), if you want to feel this power increase then you will need to rev higher, which means using more fuel. you cant have it both ways.

air fuel controllers as im sure you are aware actually only control fuel. theyre not really designed for this scenario. you wont really see significant, if any gains from using an air fuel controller if all youve done is advance the timing and increase the rating of your fuel. im going to claim that you wouldnt see any increase in power as a result of this at all, UNLESS you had incorrectly advanced your timing, dont forget that it can be advanced as far or as little as you like.

sad to say but my euro is running on standard unleaded.

Something went balls up with refinery over here, and all stations/brands in my local area (as of thurs) have no Ultimate 98 and not even any premium.

Only put $10 in and the guy there could not tell me when the supplies would be back.

There is a noticble dif in performance too.

In Melbourne, most BP and Mobil run out of 98Ron late last week. But as of yesterday, the supplies seems to be back and I quickly pumped a full tank of BP Ultimate.

Perth Euro, have u considered some octane booster for the time being? I'm just worried about the damage it might cause to the engine.

Aaron

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Originally Posted by PERTH_EURO

sad to say but my euro is running on standard unleaded.

Something went balls up with refinery over here, and all stations/brands in my local area (as of thurs) have no Ultimate 98 and not even any premium.

Only put $10 in and the guy there could not tell me when the supplies would be back.

There is a noticble dif in performance too.

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if you value your engine you will get some octane booster quicksmart :thumbsup:

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Originally Posted by PERTH_EURO

sad to say but my euro is running on standard unleaded.

Something went balls up with refinery over here, and all stations/brands in my local area (as of thurs) have no Ultimate 98 and not even any premium.

Only put $10 in and the guy there could not tell me when the supplies would be back.

There is a noticble dif in performance too.

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Looks like there will be supplies from today although it will take a while for all the deliveries. I wouldn't worry about booster it you only put $10. Presumably your car had some 98 ron still in the tank (ie it wasn't dry). Even though the car has a knock sensor perhaps keep the revs under 3000rpm until you can fill up with premium.

http://www.fuelwatch.wa.gov.au/news/...fm?news_id=131

my car is not going or doing anything.. taking the GFs car instead

With no Ultimate stock in Perth I have run on 95 ron Shell today.

It is definately a step down from Ultimate - whether it is the ron, detergents I don't know (does it matter?). Mr Will I wish you had a Euro to feel the difference - it is definately there in responsiveness.

well all i know is that all Vtec engins should run with premium coz of its timing so how would you run it on standard unleaded .......