same engine as in the CTR? really?

 

back to the OP's query.

i also accept that UK scoobs can and will run on 95RON fuel quite happily for normal road driving. and have done so since subaru introduced their turbo cars into the uk

but, they run at their most efficent with as high a ron as possible in them, and less likely to cause damage during extreme usuage of the car

 

Totally different engine. CTR uses a K20, S2000 uses an F20. The only similarity between them as that they're both a 2 litre.

Also, the S2000's ECU will adjust timing on the fly based on the fuel rating. It was originally mapped for 98RON so that's what will it run most efficiently at, but if you dump 95 in there for extended periods it will do it no harm at all - it simply won't run as efficiently and will feel slightly less perky. I've yet to hear of any S2000 engine suffering damage simply from using 95RON fuel, I ran mine on it most of the time (due to poor availability of SUL) with no problems whatsoever.

 

Sorry for the confusion, the engines aren't the same, but the parts to this equation are.

The K20 is set up for FWD and the F20 for RWD and I think the S2000 cams rotate in the opposite direction to the crank and it has a different coolant and oil feed etc. but the engine design (bore, stroke) etc. are the same.

Anyway I am only passing on what it said in the handbook and on the filler cap of the car I had. It said 98RON and no less.

 

Or Tesco Momentum 99

 

what i dont understand is why does my02 uk wrx say in the manual 95 ron is fine but on the petrol cap it says super unleaded

 

yup shell v power 99 or tesco finest 99 for mine only as its a 02 uk sti with ppp not worth damaging stuff for a couple of pence saving at the pump but tbh i get to go a lot further with it so actually i proberbly save by using the 99 ron ones

 

Using 97 local **** water in the uk turbo and momentum in the sti.

 

The prodrive performance pack says they advise running on a minimum of 97 ron so i assume these were mapped for it . but my 2003 sti says 98 on the petrol flap to , i never put any less than super unleaded in mine . the other day i was filling up the sti and this bird came in behind me in another blob sti looked up saw it was super unleaded and moved over to another pump and put 95 ron in i couldnt believe my eyes . i once saw this with someone running a classic sti i also couldnt believe it so i had to say something he didnt no the numpty but how many people out there buy these cars and do the samething

 

Mine too, and mine is a 2007 sti type uk PPP. Never put normal unleaded in. UK STI and non-STI WRX cars are not designed for it. You will risk detonation or at very least pinging (or pinking) and long term damage to the engine. Sounds like the seller was not clued up on this. I'd personally tread cautiously, or more likely move on to the next one.

You actually get better economy with super any way, plus a bit more bhp.

 

bugeyes have super unleaded on fuel cap yet you can run them on 95 with no mods standard i always used 99

 

My old wrx-s had 95 Ron on pet cap so I put 14000 miles through it on 95 Ron

It was only when I had it serviced the guy said as it's the ppp you should be using 98

My new saloon is 98 but I think that's the import sticker

When you get the 320r pack cosworth stick a 97ron on ya cap so you can go use diff fuel

But as the lads say use the best u can get only use 95 if you need to and dont thrape it it'll be fine

 

Not worth the risk though imo. My old standard N/A golf vr6 used to suffer significant pinking on normal unleaded (it "could" run on 95 but on a rolling road diagnostic it was found to be pinking badly due to the normal unleaded fuel) and my other half's polo ran badly on 95, causing most of the coil packs to go regularly over a 3 year period. 95 isn't the best quality to be putting into these expensive machines (Subaru's that is, not Polo's ).

 

What about mixing the fuel?
Say like fill the tank with super then when its half full sticking in unleaded, then fill it back up with super and so on.
Would the fuel mix ok?

 

yeap so's mine but all the premium go go juice seem to be 97 ron v power and the like.

 

why bother either risking damaging an engine long term by using lower grade petrol? use high octane it costs a couple a pence more a litre for christ sake, not much in comparison to an early rebuild due to knackered pistons.

if in doubt carry a bottle of octane booster such as NF or millers JUST in case you have to use a lower grade. not worth risking it at all to save a few pence

 

where can one get that in Northern ireland pray tell?

 

FFS, here we go again.........

Just put SUL in. Job done. For the sake of a couple of pence........

If you dont have a garage that sells SUL near you or cant afford SUL, dont buy a Subaru.

 

It doesn't, it says unleaded super and in Europe that is what they call 95 RON unleaded.

 

Does have a point though I've thought about this as I normally fill up religiously wit vmax the cars never had anything else

But how much would it drop if u did half n half