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FN2 Best fuel?

Right never even considered this....so i use morrisons and tesco 95 because it's cheap and that's wrong? So should i be using a higher octane at all times??
Confused.com
 
R(x)Ady said:
Right never even considered this....so i use morrisons and tesco 95 because it's cheap and that's wrong? So should i be using a higher octane at all times??
Confused.com
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You should be running you car on super unleaded with an Octane rating of 97RON at least really. Jap imports are mapped to run on 100RON back in the land of the rising sun, so I have not a lot of choice but to run on 99RON otherwise I run the risk of getting engine knock.

From wiki about octane rating and knock:

Higher octane ratings correlate to higher activation energies. Activation energy is the amount of energy necessary to start a chemical reaction. Since higher octane fuels have higher activation energies, it is less likely that a given compression will cause autoignition.


It might seem odd that fuels with higher octane ratings are used in more powerful engines, since such fuels ignite less easily. However, an uncontrolled ignition is not desired in a spark ignition engine.


A fuel with a higher octane rating can be run at a higher compression ratio without causing detonation. Compression is directly related to power and to thermodynamic efficiency, so engines that require higher octane usually deliver more motive power and do more work for a given BTU or calorie of fuel. Engine power is a function of the fuel, as well as the engine design, and is related to octane rating of the fuel. Power is limited by the maximum amount of fuel-air mixture that can be forced into the combustion chamber. When the throttle is partially open, only a small fraction of the total available power is produced because the manifold is operating at pressures far below atmospheric. In this case, the octane requirement is far lower than when the throttle is opened fully and the manifold pressurehttp://en.wikipedia.org/wiki/Manifold_pressure increases to atmospheric pressure, or higher in the case of supercharged or turbocharged engines.


Many high-performance engines are designed to operate with a high maximum compression, and thus demand high-octane premium gasoline. A common misconception is that power output or fuel mileage can be improved by burning higher octane fuel than a particular engine was designed for. The power output of an engine depends in part on the energy density of its fuel, but similar fuels with different octane ratings have similar density. Since switching to a higher octane fuel does not add any more hydrocarbon content or oxygen, the engine cannot produce more power.


However, burning fuel with a lower octane rating than required by the engine often reduces power output and efficiency one way or another. If the engine begins to detonate, that reduces power and efficiency for the reasons stated above. Many modern car engines feature a knock snesorhttp://en.wikipedia.org/w/index.php?title=Knock_sensor&action=edit&redlink=1 – a small piezoelectric microphone which detects knock, and then sends a signal to the engine control unit to retard the ignition timinghttp://en.wikipedia.org/wiki/Ignition_timing. Retarding the ignition timing reduces the tendency to detonate, but also reduces power output and fuel efficiency.


Most fuel stations have two storage tanks (even those offering 3 or 4 octane levels), and you are given a mixture of the higher and lower octane fuel. Purchasing premium simply means more fuel from the higher octane tank; the detergents in the fuel are often the same.
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R(x)Ady said:
Right never even considered this....so i use morrisons and tesco 95 because it's cheap and that's wrong? So should i be using a higher octane at all times??
Confused.com
Click to expand...

My car has been remapped on higher octaine fuel so will perform better on it. That doesn't mean my car will explode if I put 95 Ron in or anything, but I won't get the 220bhp I got when it was tuned.

Edit: I'm too slow for Jermal's posts! Paul at TDi mentioned the knock retard on the K20 engine, so I'm trying to be cautious.
 
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Great thanks (again) Loxy. I've just started a new thread anyway so i'm sure everyone will say the same. I'll run the Flashpro as you suggested on group n and possibly get a tune done at some point. So 97 it is then....but from a supermarket or well known...?
 
R(x)Ady said:
Great thanks (again) Loxy. I've just started a new thread anyway so i'm sure everyone will say the same. I'll run the Flashpro as you suggested on group n and possibly get a tune done at some point. So 97 it is then....but from a supermarket or well known...?
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That's what I'm debating. It's always been V-power on my FN2 and my EP3 previously. :lol:
 
[video=youtube;gQghB4asSnI]http://www.youtube.com/watch?v=gQghB4asSnI[/video]
 
I run my Eco wagon on Tesco 99 mainly because i get another 40 odd miles to a tank even though most put 95 in these sorts of cars.
All modern cars adjust to the fuel you put in so putting in higher octane fuels will only be better for your MPG and performance.

Most tight a*ses see the price and buy the cheap stuff thinking it costs less to run the car but in the long run putting in higher octane fuel gives you more miles to the tank therefore offsetting the cost of the expensive stuff.

Cars like the Type R should only ever be run on Super as its not worth owning a car like that if you are going to skimp on fuel. The same can be said about these people that stick cheapo tyres on performance cars, its a complete waste of time.

Just my opinion, probably why i had to sell my S as i couldn't justify the running costs of premium products because i would accept anything less.
 
I use either Shell fuel save or Tesco 95 in my EP3 and it performs just fine.
 
I use vpower but only because it's more cost efficient than fuelsave. Obviously this is down to the difference in price between fuelsave and vPower in my local area, might be different for others
 
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Shaenei said:
I use vpower but only because it's more cost efficient than fuelsave
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Depends on your situation though, sitting in traffic in Watford, it's not going to make much difference, but when you're on faster roads it will.
 
Am i right in saying that although vpower and the like is better, the FN2 can run without problems on standard unleaded. sorry if this sounds daft...i havent got a ctr just yet. thanks.
 
cheers for that. am sick of running my STi only on vpower at the extortionate rate it currently is. another plus for eventual FN2 ownership.
 
As has been said in this thread though, you can get higher mileage from higher RON fuel.
 
Personally, I definitely get better MPG from higher octane fuel, but I run a re-mapped JDM S2000.

Also the performance feels dulled ever so slightly, a definite 'punch' is missing from the throttle response.
 
For the extra 15 pence a litre for v power I can get more milage by not buying it and saving money by using normal unleaded lol
 
MilanoChris said:
Depends on your situation though, sitting in traffic in Watford, it's not going to make much difference, but when you're on faster roads it will.
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I agree with you mate.... Traffic in Watford can be hectic. What car you drive? I might have seen you around... =P
 
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