Date: Mon, 13 Oct 2003 08:59:33 +0100
From: MeatballTurbo <>
Subject: Re: any one know what 93 Octane in the US is, in RON?

In article <>, says... > If you want to know what RON BP Ultimate is, there's a thread on Saab > Central. I gather it's 97.5 RON (from VW and Saxo forums, found by > colleagues) but with the "additives", you get the equivalent of 100 RON. I > gather the petrol is like adding one of those "octane booster" products to a > normal tank of Super. OK, sounds about right. > I've yet to try the petrol, but my impression of other similar products, > such as Shell Optimax, are that they're good for the odd tank here and > there, but you're better with normal super unleaded at 97 RON. Yeah. Wasn't overly impressed with Optimax after 2 tanks. MPG went down, and performance didn't alter much. > I measure petrol performance as a combination of MPG and number of > embarrassed Bimmers, although I'm starting to pick more on Mercs now :) Fun isn't it. Anything less than a 325, or a 530 is fair game. > Actually, I find that Optimax produces a less controlled (wandering needle > on my calibarated gauge) and sustained top boost compared to normal super > unleaded on my car. I'll post my impression of BP Ultimate for the classic > 900 when I've tried a couple of tanks. Optimax had pretty much the same effect on mine. Not stable at all. I read on the Ultimate website that they will be replacing all SUL pumps with Ultimate pumps eventually. Strange thing happened after I filled up to. Gave it a 10 of BP SUL, while I was trying to find a garage that sold Ultimate. then stuck 20 of ultimate in (was down to 1/4 tank of Sainsbury's SUL before) when I found it. Next day the car would not idle cleanly when cold, and wouldn't idle at all when warm. Since it had been in for a new timing chain the day before, it was running particularly well on the last bit of Sainsbury's SUL. Only other change I have made was I found the rubber seal that is supposed to go along between the inner wing and the engine bay, and had fitted that. Wonder if it might have air starvation. Upped the idle a bit and it ran fine. Later I got some corrugated aluminium foil 100mm hose and hung it from the come filter, across the edge of the inner arch and down into the lower part of the inner arch, so it is working like a budget induction kit. Didn't try it yesterday, but this morning going to work it seemed a lot better, and idling slightly higher when warm than I had set it, so maybe it was the lack of air getting to the filter. Now of course I've lost a lot of the woosh from the cone filter. Going to see how it goes this week, and maybe tweak the warm idle down a bit next week end if it stays consistant. -- The poster formerly known as Skodapilot.

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