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Old 04 Jun 2004, 08:57 AM   #16 (permalink)
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Well SUL can give your car a bit more peformance by allowing the cars ignition timing to stay a tad more advanced. To give you and idea you have a Knock Sensor on your car and if lets say you put a dodgy batch of fuel in your tank then the ECU would rely on the Knock Sensor to spot the problem and the ECU retards the timing thus reducing your power.....its a way of the ECU protecting your engine. Once a good tank of fuel goes back in then the ECU will do one of 2 things. If it is the earlier of the Classic Imprezas then the ECU will generally take a very long time to restore the ignition if it has retarded, hence it is good practice in this situation to reset the ECU. On the later Imprezas MY99/00 they have a built in feature which means that literally a tank of fuel later the ECU can restore the power, a rest however doesn't take very long which is what I do . So with this in mind the same goes for the RON rating of the Fuel. Standard UK Imprezas are built to run on our low rated NUL 95RON Fuel, hence the reason why the UK's are a lot less powerful than their Jap cousins (JDM cars are built and mapped for 100RON Fuel). My Scoob however whilst running the PPP needs to be filled up with SUL or 97 RON Fuel because of the extra power over the standard UK, the timing is further advanced and the Map of the ECU is looking for a higher grade of RON from the Fuel to allow the extra power. This generally goes for anyone who may have a modded UK Impreza too....always worth running them on SUL/Optimax as a minimum.

I don't think I've explained this too well and if you want anymore information on this - let me know and I'll post up some info. regarding the Rating of Fuel and the differences it makes to your engine
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Old 04 Jun 2004, 09:10 AM   #17 (permalink)
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no more reasons needed nelson :? lol so what your saying is stick the sul in instead then yes? not to bothered about the price it gussles it anyway pmsl
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Old 04 Jun 2004, 10:09 AM   #18 (permalink)
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It certainly doesn't do the car any harm with the higher rated fuel and some standard UK Turbo owners have said they have found the car to be a bit more responsive and smoother running when using SUL or Optimax.

Just my 2p worth
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Old 04 Jun 2004, 10:58 AM   #19 (permalink)
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Wish i had the oppertunity to use the premium stuff..... only sell 95 ron around here.... keep buying octane boost :shock:
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Old 04 Jun 2004, 11:25 AM   #20 (permalink)
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Hmm, Ok thats food for thought.

I was under the impression that it was less impreative running SUL oni Imprezas but I might have imagined that.

Would be good if u can post some more about all that Nelson. I will fill mine up with SUL this weekend and next week and post back and let you know if it was any different. :idea:
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