which fuel is best 95 0r 97 Octane..!

[Mipel]

Hi Lads i have just bought a 2005 Civic type R......i was just wondering if anybody knows if it prefers 95 or 97 Octane fuel.....apart from the small extra cost for 97 grade octane does this give any good benefits like performance and reliability or does it run just aswell on 95 octane.......many thanx....

[Grovsie26]

It's a UK car made in Swindon, no point at all in putting anything more than 95ron in, unless it has Kpro and has been mapped to run on a higher octane rated fuel.

[thatsprettyshady]

on my '05 Civic type r -

with 95 octane I get 26mpg
with 97/99 octane I get 29mpg

i have not yet figured out if this is worth the extra 6/7p extra per litre, but its something to definitely think about.

[Sam1990]

I'd so go for the higher octane stuff. Tesco Momentum works well in my car (5th gen Prelude), better MPG and smoother power delivery lower down. The car certainly responds better when fueled with higher octane fuel. The best method is to try it and see, you will have to run each type of fuel from an empty tank over a couple of weeks to see some consistent results.

[Grovsie26]

LOL.

A Koenigsegg CCX might need Super unleaded. Your Honda certainly doesn't.

[No Face]

I tried both, made no noticeable difference to the power delivery or mpg whatsoever. I believe there are other benefits that I don't understand (stronger detergents?) but as the ep3 manual says use 95, I'd save your money.

[sevros1981]

But if you don't put super in it, when you come to sell it you won't get the chance to state on the advert "always run on 99 ron fuel" and try to charge an extra £500. This seemed to be the done thing when I was buying mine...

[TomS09]

Grovsie26 said:

LOL.

A Koenigsegg CCX might need Super unleaded. Your Honda certainly doesn't.

Mine does, and it was made in Swindon

[Grovsie26]

Hahahahahaha.

[itsnotarace]

As above, if it has been mapped to use it then SUL is better. If it hasn't been mapped, it doesn't make a blind bit of difference so 95 is fine

7 years ownership, 5 of which I had KPro fitted.

[nottyash]

Sam1990 said:

I'd so go for the higher octane stuff. Tesco Momentum works well in my car (5th gen Prelude), better MPG and smoother power delivery lower down. The car certainly responds better when fueled with higher octane fuel. The best method is to try it and see, you will have to run each type of fuel from an empty tank over a couple of weeks to see some consistent results.

A UK Prelude is mapped for our unleaded, there is no performance advantage at all from using higher octane stuff.
The JDM market cars use 100 octane unleaded, and generally have higher power outputs.
(I had a Civic EK9 Type R and it pinked if i put normal 95 ron in it)
Ive have had 2 Gen 5 red top manual Preludes (still got one) and a gen 4 2.2vti manual all uk cars and not one has made any difference using Super.
Only way to make a car run faster with super unleaded is to have a car designed to run on it in the first place OR remapped to run on it.
Its called a Placebo I think with most people.

[deeps]

Higher octane fuel doesn't give more power anyway (the calorific value is not greater) and most people with UK cars are using it for no gains at all. Personally I always use 99 though, because I run Jap cars with raised boost.

[Lewtyper]

Grovsie26 said:

LOL.

A Koenigsegg CCX might need Super unleaded. Your Honda certainly doesn't.

Jap cars WILL make more power on super.

[deeps]

As said above, 99 octane fuel doesn't have a higher calorific value than 95. The way you'll make more power using 99 is to compress the air more, but doing so with 95 will be more prone to detonation.

[Mipel]

Thanx to all u Lads for the knowledgable info you possess.....

[nottyash]

Lewtyper said:

Grovsie26 said:

LOL.

A Koenigsegg CCX might need Super unleaded. Your Honda certainly doesn't.

Jap cars WILL make more power on super.

Since when?
JDM car probably yes, as its supposed to use 100 octane fuel as its readily available in Japan, UKDM cars probably not.
There are a few cars available from the manafacturers in the UK which recommend 98 octane,Ive owned a couple an M3 actually does and a Mini Cooper S with the John Cooper Works pack. The Mini JCW had a factory kit put on afterwards basically remapping it for more power and more power is available using higher octane fuel.
Putting it in a car not built or mapped afterwards will have no effect.
I had my Golf Turbo remapped last week at Revo. i could have a 95 ron remap, or a 98 ron. I would have got slightly more power if I opted for the Super unleaded but It was of no intrest to me as there are very few garages with the stuff where I live.
TBH if you want more power a remap on a car with LPG will achieve more power still

[Grovsie26]

Lewtyper said:

Jap cars WILL make more power on super.

Than a CCX?

[Old Gregg]

Does anyone know what grade of fuel Japan used in the early 90's? My car is a 1990 JDM import with a B16a DOHC VTEC - I would assume that back then it might be no higher than 95RON, but does anyone actually know?

I must admit, I mostly use 95 but occaisionally use Super, 'cos I'm never quite sure, albeit common sense says to me that 95 is fine. I guess SUL might be force of habit/paranoia after having owned a JDM DC5 and DC2...

[nottyash]

Old Gregg said:

Does anyone know what grade of fuel Japan used in the early 90's? My car is a 1990 JDM import with a B16a DOHC VTEC - I would assume that back then it might be no higher than 95RON, but does anyone actually know?

I must admit, I mostly use 95 but occaisionally use Super, 'cos I'm never quite sure, albeit common sense says to me that 95 is fine. I guess SUL might be force of habit/paranoia after having owned a JDM DC5 and DC2...

I know that back in 1989 I bought a Suzuki Swift GTI new in the UK, and in the magazine tests it said that they actually had more power in Japan because of the higher octane fuel, so I think its been there a while,

[Old Gregg]

nottyash said:

I know that back in 1989 I bought a Suzuki Swift GTI new in the UK, and in the magazine tests it said that they actually had more power in Japan because of the higher octane fuel, so I think its been there a while,

Hmm, interesting. Thanks.