Why 98 Ron ?
#1
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Why is it so important to use 98 ron petrol in my new WRX as stated on the Flap as I have just found out ?, the reason i ask is because the wife filled it up with normal shell unleaded i have filled my WRX 04 up twice once now with 95 ron will this affect my engine, and why does the engine need 98 ron ????
cheers.
cheers.
Last edited by skubyman; 03 July 2004 at 08:31 PM.
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Hello m8.... Not essential that you use 98RON but highly highly recomended... The higher the RON value the cleaner the fuel and the better the cars performance...
Its also most prob advised to use octance boost whenever you fill up on normal 95 RON fuel...
The car will go and go and go
on 95RON but you will loose a bit of performance as a result...
Hope that helps
Gareth
Its also most prob advised to use octance boost whenever you fill up on normal 95 RON fuel...
The car will go and go and go
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Hope that helps
Gareth
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Why is it so important to use 98 ron petrol in my new WRX as stated on the Flap as I have just found out ?, the reason i ask is because the wife filled it up with normal shell unleaded i have filled my WRX 04 up twice once now with 95 ron will this affect my engine, and why does the engine need 98 ron ????
Ive run it on nothing but optimax/Ultimate since and have had no repeat of the problem....
So my advice to you is to adhere to the fuel cap where its possible, otherwise when you put 95ron in it, dont drive it hard to long period cos it just wont feel right.
Neil.
P.S. Please dont get me wrong, it wont damage the car (to my knowledge) but you will feel that it stops pulling after 4000rpm when driving spiritedly.
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IIRC only the PPP maps are specific to 97\98 RON. The Subaru site states the WR1 needs 97 RON, and used to state 95 RON for WRX and STI. Since the website has been updated the fuel grade info has been removed.
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It's a topic of some debate and I'm not sure anyone has a definitive answer.
AFAIK most UK Imprezas will run on 95 RON without actual engine damage. They will, however, only deliver optimum performance on SUL or, ideally, Optimax. The difference is especially pronounced with PPP or STI cars.
PPP on UK cars pre-'97(?) does require SUL and could be damaged by 95 RON.
The sticker in the fuel filler says 98 RON in almost all cases - even on cars which will run happily without damage on 95, so it's far from definitive.
Japanese imports are a different can of worms entirely - they all require the highest octane available (at least Optimax, ideally plus octane booster) to avoid damage, unless they've been remapped
AFAIK most UK Imprezas will run on 95 RON without actual engine damage. They will, however, only deliver optimum performance on SUL or, ideally, Optimax. The difference is especially pronounced with PPP or STI cars.
PPP on UK cars pre-'97(?) does require SUL and could be damaged by 95 RON.
The sticker in the fuel filler says 98 RON in almost all cases - even on cars which will run happily without damage on 95, so it's far from definitive.
Japanese imports are a different can of worms entirely - they all require the highest octane available (at least Optimax, ideally plus octane booster) to avoid damage, unless they've been remapped
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Have had my MY98 UK Turbo with the FULL WR Sport Pack. ONLY EVER Run ON Optimax.
Its seems a general consensus....Higher the RON Rating the better the performance and long term engine maintenance...????
Dunno If that makes sense but Optimax ALL the way.....Even though It kills the pocket BUT the DRIVE more than makes up for it![Smile](https://www.scoobynet.com/images/smilies/smile.gif)
![Smile](https://www.scoobynet.com/images/smilies/smile.gif)
Its seems a general consensus....Higher the RON Rating the better the performance and long term engine maintenance...????
Dunno If that makes sense but Optimax ALL the way.....Even though It kills the pocket BUT the DRIVE more than makes up for it
![Smile](https://www.scoobynet.com/images/smilies/smile.gif)
![Smile](https://www.scoobynet.com/images/smilies/smile.gif)
![Smile](https://www.scoobynet.com/images/smilies/smile.gif)
#15
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The Pocket isn't the problem, I'm not that mechanicly minded on engines just thought i'd ask to see what the result was because of what it said on tha filler flap I used Opti first then the wife kindly filled her up after Only filled it up twice yet, but the last with standard only shell..
Thx for all ur views the wife has now been educated....
Thx for all ur views the wife has now been educated....
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Have had my MY98 UK Turbo with the FULL WR Sport Pack. ONLY EVER Run ON Optimax.
Its seems a general consensus....Higher the RON Rating the better the performance and long term engine maintenance...????
Its seems a general consensus....Higher the RON Rating the better the performance and long term engine maintenance...????
It's certainly true on all models that the higher the octane level, the better performance will be. There is, however, a big difference between reduced performance for the duration of that tank of fuel, and suffering engine damage!
#17
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Originally Posted by AndyC_772
Optimax wasn't available in '98...
It's certainly true on all models that the higher the octane level, the better performance will be. There is, however, a big difference between reduced performance for the duration of that tank of fuel, and suffering engine damage!
It's certainly true on all models that the higher the octane level, the better performance will be. There is, however, a big difference between reduced performance for the duration of that tank of fuel, and suffering engine damage!
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#18
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Originally Posted by AndyC_772
It's certainly true on all models that the higher the octane level, the better performance will be.
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The WR1 is mapped for 97 RON fuel, so what effect would using 98 RON have, if any? I mean, would it be better (either in terms of performance, or engine longevity), would it be worse (eg. running too rich) or would there be no difference (so using 98 instead of 97 is nothing more than a waste of money)?
Cheers.
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It would allow your timing to run slightly more advanced, ie more performance. ![Big Grin](https://www.scoobynet.com/images/smilies/biggrin.gif)
I don't think engine longevity would be affected, one way or the other.
It definitely wouldn't be worse, and it wouldn't cause it to run too rich.![Wink](https://www.scoobynet.com/images/smilies/wink.gif)
Here's the daft thing. In the Midlands, Optimax is cheaper than BP Ultimate and Esso SUL... !
![Big Grin](https://www.scoobynet.com/images/smilies/biggrin.gif)
I don't think engine longevity would be affected, one way or the other.
It definitely wouldn't be worse, and it wouldn't cause it to run too rich.
![Wink](https://www.scoobynet.com/images/smilies/wink.gif)
or would there be no difference (so using 98 instead of 97 is nothing more than a waste of money)?
#20
#21
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Originally Posted by The_Judge
It would allow your timing to run slightly more advanced, ie more performance.
Originally Posted by The_Judge
Here's the daft thing. In the Midlands, Optimax is cheaper than BP Ultimate and Esso SUL... !
![Big Grin](https://www.scoobynet.com/images/smilies/biggrin.gif)
#22
#24
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Originally Posted by The_Judge
Here's the daft thing. In the Midlands, Optimax is cheaper than BP Ultimate and Esso SUL... !
![EEK!](https://www.scoobynet.com/images/smilies/eek.gif)
#25
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Originally Posted by keith g
what about if you put normal 95 ron in the tank but also use oxtane boost asweel, is that just the same as running say 98 or 99 ron fuel like optimax etc?
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