mit

iTrader: (10)

Hi, quick question, if i import a MY2000 Forester S TB, will it be reliable on UK RON 95 fuel?

Thanks,Mit

Koi Performance

I would advise to use minimum of V-Power or Tesco 99RON fuel. Even look at using a bottle of Octane Booster with each tank to reach the 100RON fuel used in Japan.

Other than this, if you want to run on UK 95 fuel I would speak to your local tuning specialist and discuss getting it bookeds for a remap.

Best,
Team Koi

mit

iTrader: (10)

Ah, thanks, i did think this would be the case.

Thanks,Mit

rewindnottm

Hi,

Open-mapping.com offer a service where they 'flash' your JDM / import car with a UK / EDM fuel complient map to solve the fueling issue for £125.

send them an email.

mit

iTrader: (10)

Thanks for that, I'm in the process of importing the car now, so may give them a try!

stinger_sweaty

yes it will be fine to run on 95ron, octain booster is just a waste of money and will ruin your cat in the long run, yes the car will run better and give a very slight increase in mpg if you put shell v-power in, i would say stick at least 97ron in, but 95ron wont harm the car it will just not have has much power, in japan there normal unleaded is actully worst than the uk's normal unleaded, and not every petrol station in japan does 100ron fuel about 1 in 15 only do it, they have 3 types of petrol, normal (less ron than the uk), super 97-98ron and premium 100, and some places do 102ron.

allsop83

iTrader: (9)

I personally wounldn't run it on 95RON.....

Don't think any well known Subaru Specialists would advise it either.

It's not for any power increases or MPG figures I would be pushing a remap or Octane Booster but simply to protect your engine from knocking!

The subaru engines of this time are well known for big end failures when running on cr@p fuel. MAF's are notiriously weak also so I'd look at changing that aswell when the vehicle arrives.

Post or search in the Technical section on here and you will find numerous threads about the effects of using poor fuel.

jonny_693

iTrader: (5)

How do you come to this conclusion?

Simon 69

RUBBISH. The S-Turbo was intended to run on Premium Unleaded which is 100RON. If you run it on 95RON itll detonate itself into destruction and the ECU doesnt have sufficient range of adjustment to compensate. New Age ECUs were superior but a MY2000 wont cope with anything less than V-Power or Greenergy 99RON.

stinger_sweaty

hows it rubbish??? has long has you stick sul in it will be fine, even with 95 ron, loads of my mates have imports and and use 95 Civic type r's ek9, skyline r33 gts, alot of them run it on 95 ron and that hasnt caused any harm to there cars, i even once ran my sti 3 on £25 of 95ron only because i had no choice and it ran with no problems, yes you should be using sul in subaru's, but using octane boost is a pure waste of money and will defo ruin ur cat in the long term.

jonny_693

iTrader: (5)

Your advice goes against the grain of every subaru speicialist in the country. Of course the car will run on 95 but at high revs/boost/load it will knock its **** off. I agree that octane booster is not a necessity when using 99 ron but who's bothered about cats? They are cheaper than a bottom end rebuild.

allsop83

iTrader: (9)

Agreed, Engine health is the most important thing here and it really doesn't matter what a Civic or Skylines will do on 95RON, these are Subaru engines and every specialist in the country will tell you that 95 kills Subaru engines.....

I even managed to nuke an MR2 Turbo engine on 95RON....lol. Didn't find out til after that I really should have been using a higher grade of fuel.....that's where my education began....

Simon 69

Im not going to argue with you. After 7 years and 15,000 posts here Im happy that I know what Im talking about, when it comes to imported Imprezas, importing Imprezas and their day to day care.

"...my mates did it it was alright..." type comments identify you as someone with little idea as to what theyre talking about.

Simon 69

Clue here for the hard-of-thinking. Please read, ingest, research: and then stop posting such potentially harmful rubbish on forums.

scoobychick555

i've got an import and got it remapped for VPower.

i would NEVER put 95 ron unleaded in it because its not good for the engine, imports dont like it.

also, if i was going to buy another import, fueling would be the first question I would ask.
I would walk away from anything thats been running on normal unleaded, no matter how great the car is.
Its not worth the gamble.

imy

scooby546

iTrader: (1)

+1 saving for a remap just now myself, but has always been run on v power and always will be; its simply not worth the risk running it on lower grade fuel given the costs of a rebuild vs the cost difference of v power compared to other fuels

mit

iTrader: (10)

Thanks for the replies!
I am importing the car, so know it's not been run on iffy uk fuel, and want to keep it that way!
I went for a MY98 car in the end, which is a bad year for mapping. New ecu time!
I'll be using v power in it, so hopefully will be ok. I saved a large amount of cash on importing, so don't mind using expensive fuel(v power's the only fuel i've ever used in my RA)

stinger_sweaty

okok point taken guys, i know that you should run the car on sul and i know people in japan do but 100ron wasnt avaiable til the late 90's in japan, and iv been running my sti 3 on 97ron because thats the best i get where live and i dont get any problems.

sponners

iTrader: (4)

you shouldnt make comments like this on a open forum if you dont know what your talking about!

someone may read it and think the information your giving is correct.

1. fuel economy wont change be it run on 95, 97 or 99 ron.
2. higher octane doesn't give you more power! - it provides better resistance to knock (it allows you to run more power)

so to the original poster, safest to get it remapped to run on lower octane fuel.

Simon 69

100 RON was available from 1996 in Japan. It makes me smile to now see this stated on forums (if only I could get the credit for it)..... With regards to the comment above. Octane rating does affect mile per gallon figures, with higher octane fuel usually paying for itself.

eggy790

iTrader: (20)

mit you selling your ra? pm me if you are etc. with price.

cheers

mit

iTrader: (10)

No, the RA's staying, sorry!
The forester's going to be the ladys car, good for the dogs, will be our every day car. Oh, and it's white too, best colour!

scooby546

iTrader: (1)

Thats a nice forester mate

sponners

iTrader: (4)

please explain how a higher octane fuel will alter the IDC and give better fuel economy?


(the only way higher octane fuel will give you better fuel economy is if the fuel your runing is causing the engine to knock and the ecu is adding extra fuel to try and combat the knock)

Simon 69

As youre obviously feeling clever, explain why most people report higher MPG figures using SUL, particularly Optimax/V-Power, if hti sis not the case. I too have noticed similar benefits in everything from old Porsches to Imprezas.

Whilst youre at it, you might want to edit post #19, so that it makes sense; or at least isnt full of foolish contradictions.

sponners

iTrader: (4)

now now

regarding fuel economy, your imagining it.

foolish contradictions?, please explain

allsop83

iTrader: (9)

I'm afraid he's right spooners....

A smoother, more economically run engine will ultimately improve mpg (admittedly not always anything major but just think about it........)

Also, the whole convo here is about a Subaru engine so you, by saying that the only way MPG will be improved because of the ECU using more due to knock have failed to realise that you are giving reasons it would, will and should imporve MPG but on the other hand saying it won't change.....

Bit odd to sy it won't improve but then in the same comment explain exactly WHY it WILL change

sponners

iTrader: (4)

lost me now mate,

an engine mapped for 95ron that runs safely on 95 ron uses x amount of fuel

put 99ron into same engine, same map and it will use the same amount of fuel.

if a car was mapped for 99ron and you put 95 in it, it will then knock and the ecu will add more fuel.

so if your engine is knocking on a lower ron fuel then adding higher octane fuel will make it better on fuel.

(above make sense?)

The Trooper 1815

iTrader: (31)

Back to the original OP. I like Foresters and had a JDM MY04 STi for a while, Litcho job with the full 330/350 engine mods

A few people have already said about doing a search in the archives to highlight the problems running JDM cars on crap UK fuel. You'll be there for a long time reading the tales of blown this and that and the common thread is UK low RON fuel.

Err on the side of caution and spend a couple of hundred now not thousands later.

One point though, early cars will probably need a good undersealing

allsop83

iTrader: (9)

But JDM cars will be mapped for a higher grade of fuel.

Not feeling this is enough to warrant a huge spiel.