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#31 | ||
Banned
Join Date: Sep 2005
Location: Ipswich QLD
Posts: 4,697
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I tend to use 98 and weve never really checked kays tho. Occassionally go 95 if its really expensive but learnt a bad leason with terrible economy from half a tank of 91 once. We deff get at least .5l better economy around town with the new cai airbox tho. It even shows on some hills on the instant economy readings that I got. Took down some readings before the airbiox was fitted. Pretty cool if you ask me.
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#32 | ||
Spooling...
Join Date: Jan 2013
Location: Perth NOR
Posts: 28
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I use united p100 fuel, gets me an extra 50kms to a tank and it is usually 6-10c a litre cheaper than 98! Only problem is trying to find a united servo in perth that sells it haha
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Fg xrt 50th anniversary ute Needs about 30k then ill be happy 😂 Ran a 12.9 no tune, no spool on launch with "bolt on mods". Made 382rwhp on byes dyno WTB: FG MK2 XR FRONT BUMPER, Prefer silhouette. |
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#33 | ||||
Banned
Join Date: Feb 2010
Posts: 5,801
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Quote:
1. Is it really worth driving out of my way to buy 98 Octane, closest bowser is 8 km's away and with the very short range of the SC car around the city it kind of defeats the purpose both in respect of time and money if you have to drive a return trip of 16 km's just to get it while to be fair I acknowledge from time to time I go that way anyway. 2. Is there really any point in the (apparent according to my bum-o-metre), very slight improvement in top end kick this fuel gives me over winter when about 7 days of of 10 I'm struggling for traction on wet roads. As you can see, there's a little bit more to it than just a free cup of coffee. And who says 98 Octane is better for your FPV or Ford car than 95...it wouldn't happen to be BP would it ??? Quote:
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#34 | |||
FF.Com.Au Hardcore
Join Date: Dec 2004
Posts: 12,077
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Quote:
First one is that petrol tends to age VERY quickly and 95 or 98 for that matter does not stay that way for more than a few weeks. Second is that it is your choice what you use. The extra 8km comes down to money which as an accountant is something on which you focus. When there was not a lot of 98 or even 95 in Australia I would always plan my trips to ensure availability and carry up to 60l of "spare" petrol when needed. Third is that while all "domestic" cars are quoted at suitable for 95 as if they were not there are a whole heap of potential legal issues running them on the "wrong" fuel quite a number have quoted their "power" and "torque" with a disclaimer that these figures are on 98 not 95. I suspect there is a reason for this. As far as who says it is better...... I have done almost 500,000km since 98 came out much of which was repeating the same 800km trips at the same times of day. I experimented with many different fuels and as I was using log books it was easy to go back over long periods to compare. The core of what I found was: BP Ultimate & Vortex 98 were the best and about the same. Shell Optimax was next Then all of the 95s Fuel economy was better in cold weather and when keeping the revs about 2000, lower was actually worse. Fuel economy was better when the tyres were at a higher pressure. So on the road I run my cars on Ultimate or Vortex and keep the tyres at 36-38. It may be different for you as you are in a different country so the petrol and climate might not be the same. |
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#35 | ||
FF.Com.Au Hardcore
Join Date: Mar 2005
Posts: 1,216
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I have experienced no difference between 91, 95 & 98 octane fuel when used in my AU XR6. I believe it was tuned for 91 so if it was not designed to run on it then I wouldn't expect to see any benefit. I primarily use 98 once every so often in the XR for it's detergent value based on a statement by someone with credibility in the fuel chemist profession.
Still I do feel a sense of empowerment when I do use it ![]()
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AUII XR6 VCT ute 20 years and still going strong! |
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#36 | ||
The one and only
Join Date: Dec 2004
Location: Carrum Downs, Victoria
Posts: 9,053
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I have made more power out of 95 (twice) than 98 ever did.
I have since dropped comp but will keep the boost the same. Until it's tuned I run the LTD on 98. I suppose it could be safer? Dunno. Myth maybe? Dunno. The tune will be set up (hopefully) for response and not top end kw's.
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1992 DC LTDHO 360rwkw built by me Tuned by CVE Performance Going of the rails on a crazy train Other cars include Dynamic ED Sprint, Dynamic DL LTD, Sparkling Burgundy DL LTD, Yellow, Red & Blue XB sedan & Black XB Coupe
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#37 | |||
Banned
Join Date: Feb 2010
Posts: 5,801
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Quote:
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#38 | ||
the average bloke
Join Date: Aug 2005
Location: sydney
Posts: 115
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http://www.youtube.com/watch?v=WuCUGcqO5SE
great explanation of why we should care about octane ratings for our motors. My opinion....as my wife keeps telling me R.T.F.M. ![]() It's up to the ECU maps as to the full usage and really it's the type of driving that will dictate the amount of fuel used. I'd also back what Flappist has said look up his threads good stuff to learn |
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#39 | ||
Starter Motor
Join Date: Oct 2012
Posts: 11
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Trying to be as consisted and possible, I get about another 80km -130km per tank extra for using 98 Octane
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#40 | ||
Thailand Specials
Join Date: Aug 2009
Location: Centrefold Lounge
Posts: 49,086
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I was running Shell 98 in my Falcon before it was tuned, but my tuner filled it up with BP98 and said its much better than the rest of the other 98s and tuned my car to run on that.
He showed me some dyno graphs across multiple cars and he could get higher figures out of BP98 than the other 98 blends. So I ran it on BP98 for a while, but this tank I filled up with United 100, to see any difference, so far my idle seems to be a touch less rough, its more expensive though. I got 590km out of 67L on BP 98, average speed 54km/h, average indicated use 11.5L/100km. I'm going to give Caltex E85 a shot soon, one of my workmates run his modified EL on 50/50 98/E85. Our Fiestas say you can run them on 91, but come into the small car section and ask anyone here who has tried it, they idle like crap and stall when cold on our early year WS Fiestas, mine has only ever been run on 98. Also seeing the difference on Hondas when I was working at the dealership, cars which have always run on 98, vs the people who don't want to spend the extra 10 cents for the good stuff, you can tell the difference when you look at fuel delivery components, and things like fuel regs which rusted over etc. |
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#41 | ||
FF.Com.Au Hardcore
Join Date: Aug 2012
Posts: 2,374
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Don't use 98 and Caltex mixed use United 100 and E85....much better blend.
If your car is tuned for a certain gasoline then don't go adding ethanol based fuels to it even at the low number of 10%...it will run leaner than the number settled on when on the rollers. Caltex E85 is only low 70% ethanol so not as high as United's 85% min all year round. Your tuner should have seen the same results from United P100 over BP 98...P100 is a better fuel at making torque/power.
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#42 | ||
Thailand Specials
Join Date: Aug 2009
Location: Centrefold Lounge
Posts: 49,086
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Unfortunately I can't get United 100 at my closest united, only their 100.
I'll keep that in mind about the 100 with the ethanol. |
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#43 | ||
BANNED
Join Date: Jul 2012
Posts: 2,886
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Any modern car that uses a knock sensor will automatically adjust for fuel types.
91.95,98,100 the ecu will simply advance until it pings then back it off a bit. Using 98 with forced induction and high compression will yield the best high end performance....but normally aspirated? waste of money. |
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#44 | ||
FF.Com.Au Hardcore
Join Date: Aug 2012
Posts: 2,374
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Id rather use the correct fuel than rely on a sensor to save my motor somewhat.
Zilo....100 from United will give better results than any 98 from the bowser.
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03 BA Turbo 6466 external gate Hi comp motor Built BTR 4k TCE stall FG inlet and exhaust manifolds |
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