Quote:
Originally Posted by K.P.
Yeah, it's a s*it with dual fuel cars, always worrying about stale fuel. I just top it up with $5-10 every 2-3 weeks. Been using Special 91 cos it's enticing to add that "extra" at the bottom of the cycle vs 98 but 98 should last 3 months. Mobil told me that topping up the way I do with their 91 everything will be fine for 12 months (by which time what you've added a year back is gone)...but I miss 98 esp. given the unique stock tune of an FG Barra:
91 RON is 195 kW and 391 Nm
95 RON is 201kW and 409 Nm
98 RON is 208kW and 420 Nm
Bought mine in VGC at 84k already with SVI but nearly bought a demo black XR6 Mk 11 at $26k with under 200ks on it (showroom car) and was going to get LPI on it, not Orbital the other one. Black is a cow to keep clean and I wanted a "hero" colour so she's a Nitro FG XR6, some nice body/CAI upgrade mods plus Redback straight-through exhaust (which I'd have added) by previous owner and Ford leather seats etc through a Ford connection so essentially the Luxury Pack, plus Technology Pack.
I must admit I miss the 98 kick!
(My friend's just-closed shop was Dawson Prestige, not Automotive)
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You see the Octane rating and power figures are correct as to what Ford says, now why one may ask is such so ?
Well this engine is not truly designed to run on 91 octane at it's best efficiency over all, it was suppose to run 95 but the PM at the time put a stop to that, or we would of had 95 as our lowest rating, 91 was supposed to finish due to ADR law that was to come into play, but PM Gillard stoped that. so I don't know how many ducks act and people she has killed indirectly, specially in Sydney as boy is that a heavily polluted City that stinks. I think that they at least have run E10 now down their.
But when a engine has to go and retard the spark advance from it's best mapping, so it is reducing it's efficiency and therefor wasting fuel to be sure.
Now we come to summer or winter temps, so one can getaway with running lower octane in colder days and the timing will not most likely retard as much but on hot days it may retard so much more or if driven harder and with the Air-con as well all comes into play.
So in reality what one want's to do is not make the engine have to retard the timing.
If we had a function showing up just how much the engine was retarding on the run one could pop in and top up with a higher octane to help keep efficiency up.
That would be the main point of the fuel octane thing, but their is more to it again but I will leave it at that for now.