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Standard Unleaded vs Premium Unleaded 

 

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 Post subject: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 12:27 am 
Stock as a Rock
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Location: Perth
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Premium Unleaded is "less dirty" than Standard Unleaded.

True or false?
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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 8:13 am 
Getting Side Ways
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Location: albion park, wollongong
NSW, Australia

I tried premium for a month and I'd rather unleaded, my car sucked the premium I got barely any distance out of it compared to unleaded, I've also tried e10 and that's s**t my car sometimes won't start on e10 and my car uses so much, so yeah for me unleaded is the best

 

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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 9:16 am 
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VIC, Australia

I'm a chem engineering student and have been told by a few lecturers, in a car which is not tuned for 98ron (ie e-series falcons) performance difference will be minimal, however there should be a small economy improvement, BUT they recommended running a full tank of premium just once a year because of the extra cleansing properties...they said there's no need to run it all year in a car which is designed for regular..


As for e10.... I work at a shell servo part time and am a chemical engineering uni student full time...and I'm against E10, it is both less economical AND makes negligible difference to the emissions...it's just a government ploy to appear as if they're doing something about the environment...

So here's the chemistry approach, for fuel economy:

Combustion of Ethanol:
C2H5OH + 6*(O2) ---> 3*(H2O) + 2*(CO2), this reaction produces 1368kJ per mole of ethanol heat energy.
1mole of ethanol is ~46grams. So Ethanol produces 29.74kJ heat per gram.

Normal petrol is a mixture of hydrocarbons ranging from 5-carbon chains to 12-carbon so we'll take an average of 8, octane.

Combustion of Octane:
2*(C8H18) + 25*(O2) ---> 18*(H2O) + 16*(CO2), this reaction produces 5430kJ per mole octane.
1mole of octane is ~114g. So octane produces 47.63kJ heat per gram.

You can see that octane produces a lot more energy per gram than ethanol...

In terms of emissions:
So octane creates 678.8kJ of energy per mole of carbon dioxide evolved, while ethanol generates 684.0kJ. But then consider, ethanol is less efficient so more will be used meaning more tankers to transport more ethanol meaning more emissions from them. Then I guess you could go into a whole life cycle analysis which I CBF doing but you get the idea, this is why Prius's etc suck a**, because their whole life cycle analysis gets pwned during production and during recycling.


My fairmont is tuned for 98ron, however i couldn't tell a difference because during tune i also had a cam done and gained over 15rwkw, dunno if any was due to 98ron tune...it does run more economically now though despite the extra power

 

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1: Mum's car: ED XR6 wagon.zorst,stereo
2: My cars: Holden Monaro CV8-Z 2005. ls1 v8 :)
3: Nissan 180sx.sr20det, ~180rwkw.Lotsa mods,0-100 in 5.2secs.crashed into pole :(
4: EB2 Fairmont. 5spd,2.5" zorst,hi-flow cat,extractors,wade977b,j3, plus a 152dB 200psi train horn

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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 10:13 am 
Getting Side Ways
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Location: Adelaide
SA, Australia

If I run regular, my car will ping under load when warm, if I run 98 it doesn't, it also runs smoother and i get better milage.

I have also been told that by the end of next year you won't be able to buy regular it will be replaced by E10, some states are already phasing it out.
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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 11:43 am 
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NSW, Australia

Difference is about $5 a tank. don't be a tight a**

 

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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 1:17 pm 
Getting Side Ways
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Ride: Supercharged EF Fairmont

Location: T.I. Performance HQ
VIC, Australia

Get a tune to suit Premium and reap the economy and torque gains!

Full disclosure: I sell these tunes :)
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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 1:24 pm 
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Location: Melbourne
VIC, Australia

galapogos01 wrote:
Get a tune to suit Premium and reap the economy and torque gains!

Full disclosure: I sell these tunes :)

yeah my 98ron tune was a j3 done by paul at cve...

but yeah like i said not sure how much of it was just due to the tune, because I did cam at the same time, but it did give a solid >15rwkw gain throughout the midrange :)

 

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1: Mum's car: ED XR6 wagon.zorst,stereo
2: My cars: Holden Monaro CV8-Z 2005. ls1 v8 :)
3: Nissan 180sx.sr20det, ~180rwkw.Lotsa mods,0-100 in 5.2secs.crashed into pole :(
4: EB2 Fairmont. 5spd,2.5" zorst,hi-flow cat,extractors,wade977b,j3, plus a 152dB 200psi train horn

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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 1:57 pm 
Stock as a Rock
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Ride: EF xr8

Location: Albany
WA, Australia

98 is way claner than norman unleaded. Iv proved it wen i changed my fuel filters after normal unleaded and there full of crap and after 98 it barely has any dirt at all!! I have to run 98 in my car anyway coz it pings with normal unleaded and runs like crap
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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 10:27 pm 
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Location: brisbane
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well i dont supose you can run on av gas anymore i used to use it in the 60s and 70s for street use and cheaper that super for me at that time
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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Thu Jul 15, 2010 11:51 pm 
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i run nothin but pulp (premium) in my cars , if i run ulp the cars run ruff ,idle ruff ping under load and use a s*%t load more fuel
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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Fri Jul 16, 2010 1:20 am 
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I went to the v8 supercars one year. Bp was sponsoring an fpr car and they had an exhibit with two bf gtp's on a dyno. They claimed they were both identical except one was running 91 and the other was running 98 ultimate. There was up to 20% difference in power, but they didn't let on that one car was auto and the other a manual. Hard to see but I could see one guy shifting and the other guy had both hands on the wheel. I am kicking myself now for not pointing that out in front of the crowd. But they gave me a $25 98 ultimate voucher for answering the question right.
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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Wed Jul 21, 2010 8:13 pm 
Stock as a Rock
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Ride: AU Mont 2000

Location: Perth
WA, Australia

So which station would have the best quality Premium Unleaded?

BP? Caltex? Shell?
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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Wed Jul 21, 2010 8:19 pm 
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cczfairmont wrote:
So which station would have the best quality Premium Unleaded?

BP? Caltex? Shell?


imo, bp...........
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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Wed Jul 21, 2010 11:21 pm 
Getting Side Ways
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I use shell or Caltex for PULP, only as I get a discount thru the vouchers there lol.
With a J3 tune and the AU motor I had it'd ping on 91 or 95, but not on either of those 2 98 ron stuff.

 

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 Post subject: Re: Standard Unleaded vs Premium Unleaded
Posted: Tue Aug 31, 2010 2:13 pm 
Getting Side Ways
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Ride: BF XR6,

Location: NEWCASTLE
NSW, Australia

if i run 91 for a while my car misfires and all the injectors stuff up, i run 98 it goes well and doenst drink as much, also i ran e10 for a while and it stuffed my fuel pump, ill never use the stuff again

 

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xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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