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1.4 TSI - super unleaded?
- Thread starter paulov
- Start date
I always use Tesco Momentum 99, runs really well with no flat spots, both wife and daughters Fiesta's also use it again with no flat spots.
Even in my 1.8 TSI I can't really tell much difference. I mainly used Shell V Power in my 1.8 for the first few months when it was new. I then visited my sister in the West of Scotland where all that was available anywhere near was standard Jet unleaded. I soon noticed than my car ran just as well on this standard Jet fuel driving around the West of Scotland for a few weeks and then back down the motorway to Nottinghamshire. I've never used any super unleaded again for over 2 years. Why pay between 10 and 15 p a litre extra for something that to me makes no noticeable difference. Perhaps others will think differently.
use what the book tells you which is 95 as thats what the car is tuned for
if it was tuned for 98/99 you would see a difference and benefit from it
you are wasting money
if it was tuned for 98/99 you would see a difference and benefit from it
you are wasting money
The ECU is adaptive. It will alter the ignition mapping if higher octane fuel is detected (via the knock sensor).
Allegedly, a good 1.8 will clock 195PS on 98 RON fuel with the factory ECU firmware and map.
Allegedly, a good 1.8 will clock 195PS on 98 RON fuel with the factory ECU firmware and map.
Mine feels like it runs better on Shell Nitro compared to standard Unleaded. Seemed to be a bit more reluctant on acceleration with 95 RON somehow so I've stuck with the super unleaded even if it does cost a bit more.
On a 65 plate 1.4 ecoTSI SC FR
On a 65 plate 1.4 ecoTSI SC FR
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I've run VPower on my 1.8 from new mainly for the cleaning qualities as my mileage during the week is quite low and it supposedly helps reduce deposits on the valves/cyls etc. No Tesco 99 round here for me else I'd give it a go.
I did hear some time ago that Super benefits engines with a power output ratio of 100bhp per litre or more, though I don't know of the truth in that as it potentially goes for most turbo engines these days yet most have 95 inside the fuel flap.
I did hear some time ago that Super benefits engines with a power output ratio of 100bhp per litre or more, though I don't know of the truth in that as it potentially goes for most turbo engines these days yet most have 95 inside the fuel flap.
I've always used 98e5 RON and Vpower 99, i do not notice any difference but price.
I would not use 95e10 RON when car is a tuned though.
I would not use 95e10 RON when car is a tuned though.
Probably true a few years ago - my previous 1.4 TSI engines were twincharged and really did benefit from using 98 or greater (it was recommended for the Fabia and it really didn't like running on 95 but certainly the Scirocco went a lot better on 98 or better - fuel economy alone paid for the increase in cost and the performance was also markedly improved). I've not tried the 1.4 in the Leon on anything other than normal 95 though but it's a different engine completely and not sure it would give any tangible benefit?
I'm the same, but I change every 2-3 times. Don't really notice any difference - but I guess I wouldn't really alternating between the 2 like that
Used Super on the first fill and again for a long run recently, other wise I stick to Gulf or Esso....I never use supermarket petrol as I don't think the car runs right on it
Mine runs fine on Tesco 95 to be honest and that's where it gets filled 95% of the time. Partly because it's over the road from home..
Just watched a repeat of a Fifth Gear episode when they tested fancy fuels against normal and Asda fuel (cheapest supermarket). the difference was hardly noticable even on the track and the consensus was for every day use, buy the cheapest 95 RON even in a so called performance car. It does have 98/95 RON on the flap of the Cupra anyway.
I only ever used Tesco Momentum 99/Shell V-power/BP ultimate in my mk2 1.4Tsi sport.
It wont do any harm to run on the higher octane fuels. My car ran very smooth on those fuels.
For me its not about any alledged bhp gains, its about using the fuel additives in the higher Ron fuels to keep the fuel system as clean as possible.
Think of it this way......
You could use ordinary unleaded in your car, but then, if you want to clean out any harmful deposits from the fuel system, you'd have to then buy a fuel additive like Redex or similar to run through your system with a tank of fuel (if using 95Ron all the time)
Worse case is that you may have to get a carbon decoke service like Terraclean done eventually.
Whats the point in spending extra money on Redex to run through a tank??
You may as well just run your car on the good stuff from the off, its not that much more expensive & at least you'll know that your fuel system is kept as healthy as it can be without the need for buying any Redex or risking having to spend extra on a Terraclean service
It wont do any harm to run on the higher octane fuels. My car ran very smooth on those fuels.
For me its not about any alledged bhp gains, its about using the fuel additives in the higher Ron fuels to keep the fuel system as clean as possible.
Think of it this way......
You could use ordinary unleaded in your car, but then, if you want to clean out any harmful deposits from the fuel system, you'd have to then buy a fuel additive like Redex or similar to run through your system with a tank of fuel (if using 95Ron all the time)
Worse case is that you may have to get a carbon decoke service like Terraclean done eventually.
Whats the point in spending extra money on Redex to run through a tank??
You may as well just run your car on the good stuff from the off, its not that much more expensive & at least you'll know that your fuel system is kept as healthy as it can be without the need for buying any Redex or risking having to spend extra on a Terraclean service
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Fill it with whatever the fuel cap recommends. The Cupra always gets Super in some shape or form.
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