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Discussion Starter · #1 ·
Hi guys, i was recently told by a friend that he was getting more mpgs and better performance from his 1.8 ivtec after using super unleaded but i have also been told it does not work, can anyone please tell me if it does work and if so how you reset the ecu if you have to reset it. ( heard lots of different stories of what to do ) any help would be much a appreciated.
 

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I use it and get more mpg and a little more responsive engine. You don't need to adjust anything as the engine will do this itself. The car has a knock sensor and this allows the engine timing to advance more with higher octane fuel. It will self adapt.
 

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i use it cause my car runs smoother with it, dont get better mpg or more bhp though...if your car is standard it will be mapped to 95 octane...
The timing of the engine is advanced until it detects a knock then it backs off. The sensors allows continual adjustment, many times a second. Higher octane fuel will allow the timing to advance further however gains in bhp will very limited for non turbo engines.
 

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Muscles From Brussels
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ive always used it in all of my cars (even crappy 1.2s) and it does get more mpg not sure that much on performance due to N/A. My old astra 1.6 16v that used to splutter and act up on regular after running 99 momentum for a year
 

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R.I.P - (User sadly passed away)
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My 1.8 definitely runs smoother and a bit quieter on 98 \ 99 ...

More power ? - no - but the engine does feel more 'responsive' ...
 

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Filled mine up with vpower unleaded just before xmas to pamper her. wasn't untill i had payed that i remembered it's a DIESEL. Luckily didn't start it but had a 3 hour wait and cost me just over £300. So not always a good idea lol.
 

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R.I.P - (User sadly passed away)
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Filled mine up with vpower unleaded just before xmas to pamper her. wasn't untill i had payed that i remembered it's a DIESEL. Luckily didn't start it but had a 3 hour wait and cost me just over £300. So not always a good idea lol.
:facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm::facepalm:
 

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It's not just the ron rating but also the quality of the fuel. I have an M200.

I ran several tanks of Tesco Momentum (99ron) and it was rubbish for mpg (21mpg) and mid range torque. Went back to Vpower and instantly got better mpg (26+mpg) and more mid range power. I find on crap fuel I get quite alot of misfiring and kangarooing on cold mornings during the warm up process, with Vpower this is almost non existent.

If you have a Type-R FN2 then really you want to be running it on Vpower.
 

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Arfurs right hand man
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using high octane petrol will not really affect but using it regularly will improve ** performance a little go for good petrol shell bp i dont buy tesco anymore ot texaco....
Not BP down the Godstone Road (A22) I hope? Worst garage in the UK.

Absolutely hate how BP have led the way in turning petrol stations into mini M&S superstores. You go in for petrol and have to stand in the queue behind 600 little old ladies who are doing their weekly grocery run. The Godstone Road one seems worse than others for some reason, plus its on the way to the M25 so is usually about 1-2p a litre more than the Shell 2miles back down the road!!
 

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Another argument you hear in favour of using 98/99 RON is that they often have better additive packages.

I have tried but it's really difficult to establish exactly what these additive packages are. All fuel has a basic mix of detergents, anti foaming agents etc but it's nigh on impossible to get a detailed spec from any of the main suppliers.
 

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It depends on your ignition system and how sophisticated its knock sensors are (could be per cylinder or just one on the block).

Don't assume it will make more power as some cars can reach their knock limit and back off the timing and can make less power!

One would assume a type R would unlock the full potential of high octane fuel. As for additives, I just use STP or any other decent fuel additive every 10,K miles or so (works out cheaper than using high octane fuel just for the better additives)
 

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I've just cleaned my fuel system out with this

And now use super unleaded (sainsburys I must admit)
My early morning kangaroo jumping has gone.
 

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Not sure about the 1.8 but using higher octane fuel does make a small difference to the CTR at least.

If you understand how the honda knock logic works, then you can see that the system runs a knock retard system and the higher the octane rating, then less knock retard will be run.

If you run flashpro and datalog you can see this knock retard having its effect.
 

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Not sure about the 1.8 but using higher octane fuel does make a small difference to the CTR at least.

If you understand how the honda knock logic works, then you can see that the system runs a knock retard system and the higher the octane rating, then less knock retard will be run.

If you run flashpro and datalog you can see this knock retard having its effect.
The 1.8 is able to utilise the higher octane fuel. For the past 15 or so years cars with knock sensor have been able to gain from it.
 

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Bantersaurus Rex
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1,567 Posts
I've only ever put normal stuff in my motorbike once and it felt rubbish, high octance definitely makes a difference!
I drive an oil burner on a day to day basis, what you have to weigh up is the cost vs the extra small amount of performance/mpg you may get!
 

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Premium Member
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The 1.8 is able to utilise the higher octane fuel. For the past 15 or so years cars with knock sensor have been able to gain from it.
In the manual it says "95 RON or higher"

The "or higher" implies that there would be a benefit to me or am I barking up the wrong tree?

Also, if you look at density figures, on Greenergy's website (they supply Tesco and others) Momentum has higher density than 95 so that seems to indicate a bit more bang for your buck although whether it is enough to justify 5p per litre extra I don't know.
 

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I use Shell vpower most of the time and my 1.8 ex runs smoother on vpower, i have also noticed i get about 2 mpg extra on vpower when compared to shell standard unleaded, which offsets extra 8p i pay for shell vpower these days.
 
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