Unleaded Fuel???

[attyallanlatras]

All gasoline being sold today are all unleaded. Lead being used before offer better combustion but comes with a health hazard. Long-term exposure will lead to neurological deficits esp. in children.

What the manufacturers do is to put in additives to make more efficient burning of the fuel. This makes up the varieties we had at the pumps.

Personally experienced ko lang, I found out that 93 RON unleaded madaling maubos so I shift to the higher 95 RON (Petron XCS, Caltex Gold). Recently, when my dad used the other car of similar make, and put in V-power matipid daw but it was basically on long highway driving.

Hindi kaya psychological lang yan... I am actaully confused since some would say that addt'l higher octane is beneficial only on long drives (highways) but would merely mean burning money in city driving...Anyway thanks for sharing your thoughts...

[Gerbo]

Psychological?

The previous generation EFI engines like in the old bigbody Corollas are programmed to be more fuel efficient at around 80kph which is easily achieved at highway speeds.

The current VVTi technology supposedly take the economy thing to a much higher level by having the fuel-fed adjusted even at low rpms.

I remember Niky (a very knowledgeable Tsikoteer here) explained the mechanics in easy to understand and in simple terms in one of the threads here --if i'm not mistaken its was "war of the engine displacement" which I am the TS.

check it out.

[attyallanlatras]

Psychological?

The previous generation EFI engines like in the old bigbody Corollas are programmed to be more fuel efficient at around 80kph which is easily achieved at highway speeds.

The current VVTi technology supposedly take the economy thing to a much higher level by having the fuel-fed adjusted even at low rpms.

I remember Niky (a very knowledgeable Tsikoteer here) explained the mechanics in easy to understand and in simple terms in one of the threads here --if i'm not mistaken its was "war of the engine displacement" which I am the TS.

check it out.

Thanks for the info...

[niky]

It all depends on engine programming and type.

Carburated engines cannot adjust for octane, but the age of the engines means that carbon deposits can have built up over time. High octane fuels have additives that can help clean out these deposits and promote smoother running.

EFI engines use electronic metering, meaning that they should inject precisely enough fuel for the amount of air coming into the engine, as long as the air meters are working properly. These are programmed for specific grades of fuel, though... some will run better on 95, some will run better on 92. This is because of the way they are programmed. Many mid-90's japanese cars are optimized for 95 octane, but they will accept lower octane with no damage.

Newer EFI engines with O2 sensors can adjust even better to different gasolines, and will run leaner at cruising, promoting better fuel economy on the highway. They will also have electronic ignition systems which can vary spark timing to take advantage of higher octane (spark occurs earlier as high octane is resistant to detonation... equates to more power) or adapt to lower octane (spark occurs later, less power, but safer).

These engines can run on lower or higher octane fuels than specified in the manual, but there's a limit to adaptability. If it doesn't feel like it likes the gas, use a different one. Some manufacturers will also specify what particular brands of fuel are proper for their cars, as some newer cars are very sensitive to fuel quality.

[Gerbo]

Hey, here is is:http://tsikot.yehey.com/forums/showthread.php?t=52836. Check post #16.

Sorry have to edit. Nasagot kaagad ni Niky....

[sum1_27]

same experience here...yung xtra unleaded ng petron eh parang mas madaling maubos hindi katulad ng petron blaze...kaya sa ngaun lagi na akong blaze...

[s_quilicot]

I don't think it's misleading since I believe all gasoline being sold here are all unleaded. It's a matter of branding to distinguish the source and grade/RON. Unleaded is the generic name. Just familiarize with the brand names.

93 RON
Petron Xtra Unleaded
Caltex Silver
Shell Super Unleaded
(take note Caltex doesn't mention unleaded)

95 RON
Petron XCS
Caltex Gold
Shell Super Premium

96 RON
Petron Blaze
Shell V-Power

DIESEL
Shell Diesoline Ultra
Petron Diesel Max
Caltex Power Diesel


:yawn: [SIZE=1]4013[/SIZE]

Correction lang bro J_A

shell super premium has only 93RON same as unleaded and V-power has an octane rating of only 95.

[impulzz]

buhayin ko lang tong thread...

about shell premium unleaded its 93 octane nga based on pump sticker... so what's the difference from e10 unleaded since both are unleaded??

been using xcs for about a year na. yesterday i had to fill up at shell since malapit na empty and shell was the only one near. filled up with super primium. and parang mas maganda takbo ng makina. maspino at mas malakas hatak...compared to when i was using xcs .

[aejhayl17]

another question pala: napansin ko noon pakalat pa lang ang e10 sa phil market ah. nung naging e10 na ang xtra unleaded ng petron, it have a 95 O.R. on its pumps, ngayon laganap na e10, bakit bumalik ng 93 O.R.?


and tama si sir impulzz, bakit pareho lang ng ocatne rating ang shell super unleaded and super premium? anu pa pinagkaiba nila?

[niky]

another question pala: napansin ko noon pakalat pa lang ang e10 sa phil market ah. nung naging e10 na ang xtra unleaded ng petron, it have a 95 O.R. on its pumps, ngayon laganap na e10, bakit bumalik ng 93 O.R.?


and tama si sir impulzz, bakit pareho lang ng ocatne rating ang shell super unleaded and super premium? anu pa pinagkaiba nila?

Octane ratings can change depending on testing and inspection by the DOE (remember when Petron claimed Blaze was 97-98?) and depending on additives and fuel composition. All of our fuels have the same base stock. It's the additives that determine their final octane rating.