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170 posts

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  Reply # 1483482 2-Feb-2016 12:46
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kharris:

 

Did you have it re-tuned or was this done by a previous owner.  What was the point of this retune? Racing?

 

lagbort:

 

richms:

 

US octane is measured totally differently to the rest of the world so cant be compared by numbers

 

 

 

 

Exactly

 

Octane rating is generally measured as either RON (Research Octane Number) or MON (Motor Octane Number) with slightly varying figures between the two.
Here in NZ, we use RON as our standard rating, the US uses a figure called AKI (Anti Knock Index) which is derived as the average of RON and MON.

 

In practical terms this means that fuel rated 85-87 Octane in the US is equivalent to 91 here and US rated 93 octane is equivalent to our 98.

 

Most cars will see no benefit from running an octane rating higher than they were designed for unless they have been modified or re-tuned and in fact it can cause problems with excess carbon build up due to incomplete combustion.

 

The other one to watch out for are Japanese performance cars from the 90's to early 2000's before flexible fuel mapping was widespread as at the time 'premium' fuel in Japan was ~100 octane RON and many of these cars will have been tuned for it.

 

 

 

My car (2000, Subaru Impreza STi) has to be run on 98 as it has been re-tuned and the mapping setup for 98, this can be a bit of a bother if I go on a long road trip, but generally BP has enough stations along the main highways to avoid too many issues, running a lower octane could result in engine damage.

My bike on the other hand (2014 Hyosung GT650RL) actually likes 91 octane and runs rough on 98.

 

 

 

 

 

 

 

I had it retuned. A previous owner had put on a boost controller and a blow off valve with no apparent tuning done. Speedtech in Wellington offered me a Dyno tune for basically the cost of replacing/removing those two components anyway.

 

Gained power, responsiveness and fuel economy so pretty happy overall.


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  Reply # 1483503 2-Feb-2016 13:04
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91RON has just dipped back below $1/L today in Melbourne :) Great news for my 3.6L V6 that spends most of its time idling in traffic





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  Reply # 1483504 2-Feb-2016 13:05
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I would be wary of using Ethanol, older cars will have issues as the fuel lines break down as they were not designed to have ethanol running through them.


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  Reply # 1483542 2-Feb-2016 13:48
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Sometimes I wish it was back at $2.20 per litre - crush hour traffic was considerably lighter undecided





My thoughts are no longer my own and is probably representative of our media-controlled government


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  Reply # 1483551 2-Feb-2016 13:55
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ajobbins:

 

dickytim: Gull 98 seems to be discounted but BP generally doesn't. The difference there makes using Gull a no brainer as my car can safely run on an ethanol mix.

 

You're comparing quite different fuels. Also, Ethanol has significantly less energy for a comparable unit than petrol, so any savings at the pump are almost certainly cancelled out (and then some) by the increase in fuel burn you'll have.

 

 

 

 

Gull are the Jetstar of the petrol world. Cheap petrol but YMMV.

 

 


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Reply # 1483553 2-Feb-2016 14:02
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sbiddle: Gull are the Jetstar of the petrol world. Cheap petrol but YMMV.

 

Poor comparison. With Gull you milage WILL vary. With Jetstar, there is a good chance you get the same or better service than their more expensive budget alternative, Air NZ. Not always, but far from out of the question.





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Ultimate Geek
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  Reply # 1483567 2-Feb-2016 14:11
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TimA:

 

myopinion:

 

996

 

 

Early 00's 911 aye. I see a lot of them every day.
my opinion is this or nothing.

 

 

 

 

 

 

TimA, you'll want to have a watch of this then

 

https://www.youtube.com/watch?v=MX0TSp2fBtk

 

 


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  Reply # 1483581 2-Feb-2016 14:30
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WyleECoyoteNZ:

 

TimA:

 

myopinion:

 

996

 

 

Early 00's 911 aye. I see a lot of them every day.
my opinion is this or nothing.

 

 

 

 

 

 

 

 

TimA, you'll want to have a watch of this then

 

https://www.youtube.com/watch?v=MX0TSp2fBtk

 

 

 

 

 

 

Driven a few 991 GT3 RS's and a Gt4, And every other Porsche under the sun in the last 30 years. (Excluding 918 and Carrera GT.)
GT2 would be epic tho!





 


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  Reply # 1483807 2-Feb-2016 18:56
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TimA:

 

WyleECoyoteNZ:

 

TimA:

 

myopinion:

 

996

 

 

Early 00's 911 aye. I see a lot of them every day.
my opinion is this or nothing.

 

 

 

 

 

 

 

 

TimA, you'll want to have a watch of this then

 

https://www.youtube.com/watch?v=MX0TSp2fBtk

 

 

 

 

 

 

Driven a few 991 GT3 RS's and a Gt4, And every other Porsche under the sun in the last 30 years. (Excluding 918 and Carrera GT.)
GT2 would be epic tho!

 

 

I used to go to Le Mans every year.

 

I remember one year watching on the big screen as one of the prototype cars came down the Mulsanne behind a GT3.

 

Now, the Mulsanne used to be about the longest straight in motor racing until the FIA in their wisdom messed it up by insisting the ACO put kinks in it. It's still pretty fast and a GT3 is no slouch.

 

The dash cam in the Audi or whatever it was showed it come up behind that GT3 like the GT3 was a Mini Metro with the handbrake on and shoot past it like it was just parked! Frightening.






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  Reply # 1483809 2-Feb-2016 18:58
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As an odd aside, Stihl recommend 95 for their chainsaws!








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  Reply # 1483834 2-Feb-2016 19:38
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frankv:

 

Hopefully there will be a "Gull effect" on other petrol stations in Bulls.

 

 

 

 

And it has come to pass! All petrol stations in Bulls now pricing 91 at $1.59 :)

 

 


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  Reply # 1484013 3-Feb-2016 06:54
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Petrol is being discounted at Gull today until midnight Thur.

 

BP have increased their discount to 10c a litre.

 

Pretty happy, it is petrol day today so it works well for me!

 

Will need around 72 litres today so saving an extra $7.20 might get myself a coffee...


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  Reply # 1484455 3-Feb-2016 15:10
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I drive a Toyota Mark X which has a compression ratio of 12.0:1, and I only ever put 98 in it. On the inside of the petrol flap it says "Premium" (in Japanese), which in Japan I believe means at least 96 RON.

 

It's true that most modern cars will alter timing to prevent knock, but there is only so much they can do. Mine should compensate for 95 (but would not perform as well), but I would be asking for trouble putting 91 in it.


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  Reply # 1484642 3-Feb-2016 18:12
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Behodar:

The local (Whakatane) Caltex has been $1.64 with Smartfuel* for the past couple if weeks. It dropped to $1.63 yesterday


And now it's $1.54. I jumped at that, even though the tank wasn't completely empty :)

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  Reply # 1484643 3-Feb-2016 18:16
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I find sensible driving and fuel economy habits will save a lot more long term than 10cent drop here or there.




Mike
Retired IT Manager. 
The views stated in my posts are my personal views and not that of any other organisation.

 

 Mac user, Windows curser, Chrome OS desired.

 

The great divide is the lies from both sides.

 

 


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