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Posted: Thu Aug 24, 2006 9:02 pm
by khunjeng
Premium ULP is a special blend of petrol designed to bring high octane, and hence high engine power, as well as knock- free performance to unleaded cars with a high-octane requirement.
A knocking noise can occur in an engine when there is a mismatch between the fuel characteristics and the engine's design, particularly its compression ratio, resulting in pre-ignition (also known as 'pinging').
Selecting fuel with the correct RON for your engine will prevent the knocking fuel effect caused when the fuel combusts in the compression chamber too early.
Many imported cars, and particularly those with turbochargers, are manufactured to run on premium unleaded petrol.
PULP has a Research Octane Number (RON) of 95+
RON is a measure of a fuel's compression performance and the RON rating translates into the amount of engine power. RON requirements vary according to engine type.
Posted: Thu Aug 24, 2006 9:54 pm
by jonowong
lawrencetlc wrote:hmmm, dont think that will make such a big difference though..
have been using 91 since i got the car (few months ago) and i can have an average of 550km per tank and sometimes i can even get more than 600km!
hmmm, for what i know, these octane numbers are a symbol of the "burn-ability" of the fuel... 98 being hardest to be burnt and 91 being easiest to be burnt... and the reason they produce 91 and 98 is because some cars when they use 91, their car get "knocking" which the fuel explode before it is being ignited...
But so far i dont find it a problem in my car... hmmm, maybe i shall try once using 98 and i shall update you guys ya
sorry if i am wrong but if there's any chemistry expert here, please correct me ya...
haha depends on the driver too...
im a very mivec happy driver... the car sees mivec multiple times a day
Posted: Thu Aug 24, 2006 11:18 pm
by sublime19
FTO338 wrote:This topic been cover heaps of time already, FTO ECU are designed to run on 100ron, so by using 91, you are slowly killing your car.
hmm.. so if we're using 98 then we're still slowly killing our cars
Posted: Fri Aug 25, 2006 12:37 am
by khunjeng
sublime19 wrote:FTO338 wrote:This topic been cover heaps of time already, FTO ECU are designed to run on 100ron, so by using 91, you are slowly killing your car.
hmm.. so if we're using 98 then we're still slowly killing our cars
the ecu can adjust for 2-4 RON easily...not 9-10 I don't think
Posted: Fri Aug 25, 2006 10:18 am
by DeFunkeD
from what Shell say, their Optimax is the only fuel in australia to be 100RON. my baby runs looooovely on it. i tried BP Ultimate (98RON) when i first got it, but the car didn't like it, and im obsessed about funny noises from a car and thats what the engine was doing. so, i tried optimax, 3 weeks later noises completely stopped. works 4 me...
Posted: Fri Aug 25, 2006 10:41 am
by FTO338
I had the complete opposite, one of my car had been using Optimax since day one as Optimax was the only 98ron back then, it idle a bit funny, but after I change it to Ultimate, its all fine. One of my old car love the Synergy, so I guess it’s depend on the car.
I don't have a problem of running Ultimate in FTO or any other cars.
Posted: Fri Aug 25, 2006 11:21 am
by khunjeng
FTO338 wrote:I had the complete opposite, one of my car had been using Optimax since day one as Optimax was the only 98ron back then, it idle a bit funny, but after I change it to Ultimate, its all fine. One of my old car love the Synergy, so I guess it’s depend on the car.
I don't have a problem of running Ultimate in FTO or any other cars.
I agree Kev.
I ran Optimax Extreeme for a few months in both the FTO and the R33 and found little differnce between that and BP Ultimate which is what I use now. From my reserach BP is a better product which seems to be back'd up by nemuerous other performance car friends.
etheir one would be good...
Posted: Fri Aug 25, 2006 11:47 am
by DeFunkeD
FTO338 wrote:I had the complete opposite, one of my car had been using Optimax since day one as Optimax was the only 98ron back then, it idle a bit funny, but after I change it to Ultimate, its all fine. One of my old car love the Synergy, so I guess it’s depend on the car.
I don't have a problem of running Ultimate in FTO or any other cars.
yeah, it's funny how that works... don't quite get that...
one thing i have noticed is that where i live, bp is always 1c higher than every other fuel. even on a strip of 4 service stations (eg. mulgoa rd), all the other stations price match, and bp stick 1c higher.
Posted: Fri Aug 25, 2006 3:55 pm
by sublime19
well i use BP ultimate and I'm happy with it
get about 530 in a bad week and around 660 in a good one.. average about 590ish
Posted: Fri Aug 25, 2006 6:30 pm
by lawrencetlc
hmmm, okay i will try... but its so bloody expensive
will try it next tuesday or maybe this sunday and will let u guys know after that ya..
by the way, the ECU really looks smart!! didnt know that engine actually differentiate between 91 and 98 as well!!! that's... too surprising for me!!
Posted: Fri Aug 25, 2006 10:23 pm
by bobz
Also in winter with cold ambient temps you will not get knoking as much as in summer, so on a 40 deg day, say hello to holes in pistons....
BobZ
Posted: Sat Aug 26, 2006 12:13 am
by bigpitty1
dag nabit, I only get premium where I live so only 95 octane for me which is a bit sad, but I don't really have any problem yet, I don't get any pinging in the FTO but my liberty does sometimes, that when you spray some upper engine cleaner after you service it, its apart of a subaru service.
Posted: Sat Aug 26, 2006 3:10 pm
by lawrencetlc
how does "knocking" or "pinging" feels like??
does it feel like a shaky car when the RPM is less than 1000 (when you shift to a wrong gear?)
Posted: Sat Aug 26, 2006 10:53 pm
by leinad
jonowong wrote:lawrencetlc wrote:hey, just got a question here...
anyone knows whether there's a difference in using a 91 octane fuel, or a 95 octane fuel, or even a 98 octane fuel?
The price is a huge difference though...
Thanks!
91 will causing pinging... and the ecu will retard the timing to avoid the pinging... my man filled up with 91 once... and i got 250kms out of a full tank... from F to E it was pretty bad... and the powerloss omg...
95 is ok u still get about 400kms per tank... but i didnt like the powerloss...
98 gets me about 450km per tank and its more responsive and gives more power... the kms have been tested but the power is just from feeling
Fuel here in Mildura is usually $140 for unleaded, I never look at price of Premium either
Left the car with my parants to mind and dad filled it up with Woolworths 95 EEeeEkK It seemed to have survived..
Posted: Sun Aug 27, 2006 1:54 am
by khunjeng
lawrencetlc wrote:how does "knocking" or "pinging" feels like??
does it feel like a shaky car when the RPM is less than 1000 (when you shift to a wrong gear?)
u will know...under load it will make a funny sound and the engine will feel totally wrong...like its miss firing...u will know. Under a light load u might not know the difference..
Posted: Sun Aug 27, 2006 2:16 am
by Hello_Kitty
In conclusion. BP ultimate is the best??
Posted: Sun Aug 27, 2006 2:19 am
by Hello_Kitty
my fto is dying, i normally pump caltex premium.. coz i used to use the 4 cents off voucher off woolworth.... U guys taught me a lesson again...
Posted: Sun Aug 27, 2006 11:01 am
by FTO338
I've use this example before and i'm going to write it here again.
Using normal unleaded petrol is like driving your car on space saver. Sure it will run, but for how long and what happen when you give you car a bit of a push?
Posted: Sun Aug 27, 2006 12:36 pm
by Wi11iam
BP ULTMITE is the best
but i have been using caltex 98 and my car is fine havnt noticed the difference between the both but then i probably havnt put my mind to noticing i just drive
Posted: Sun Aug 27, 2006 1:09 pm
by khunjeng