Which type of petrol?

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Stu

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#518619 8-Sep-2011 15:39

tonyhughes: I have a VE Commodore. I put 91 in it, and am only assuming thats what it needs!

Empty now, might put some 98 in it and see how it goes!

My VX SS was dyno tuned on 98, and suffered noticeable power loss on 91/95.

Running my VE on 98. Runs noticeably cleaner than it did on 95 and I've never run it on 91. I'm sure I get (slightly) better mileage on a tank of gas. Always ran the old VT on 98 also.

Pretty sure my VE doesn't like the Bio fuel (E85 petrol/ethanol blend), but I believe the 3.0-litre V6 and 6.0-litre V8 VE Series II SIDI engines handle it. Mine is an older 3.6-litre model (2007).

graemeh

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#518664 8-Sep-2011 16:19

xlinknz:
graemeh:
xlinknz: use diesel
performs better
potentially costs less
better for the environment esp. biodiesel

Vehicle costs more to buy, higher (more expensive) maintenance and need to pay road usage charge separately.

The difference between a diesel and petrol is now as little as $2K on a new vehicle. Maintenance costs are now for some manufactuers e.g. Hyundai comparable. Whats the issue with paying RUC seperately ?

It's a pain in the bum, that's all.

Good that the prices are a lot closer now and that the maintenance is comparable.

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#518765 8-Sep-2011 20:34

I can tell the difference between 91 and 95, but the line between 95 and 98 is blurry. I know if I run 98 I can smell a very strong smell of unburnt petrol in the exhaust fumes, so the nissan must not be tuned for 98 at all.

I suspect 98 octane induces some form of Placebo. Mate was running 91 in his RB25det, filled up with 98 and said after about 20 seconds that it felt much much better. I'm sure the diluted 98 didn't reach the cylinders for some time after that.

TheUngeek

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#518781 8-Sep-2011 21:23

91 in an RB turbo?? It would be an almost instant feeling!

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#518787 8-Sep-2011 21:51

corksta: Yes

i am surprised, i was told that new cars (toyota, kia, hyundai, subaru, honda, volkswagen) should be able to run on unleaded '91, '95 or '98 with no issue. 91 is cheaper and more economical if you driving less than 60km/h. if you go on motorway and driving >80km/h, it is better to run on higher octane fuels for perfomance.

TheUngeek

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#518789 8-Sep-2011 21:52

nakedmolerat:
corksta: Yes

i am surprised, i was told that new cars (toyota, kia, hyundai, subaru, honda, volkswagen) should be able to run on unleaded '91, '95 or '98 with no issue. 91 is cheaper and more economical if you driving less than 60km/h. if you go on motorway and driving >80km/h, it is better to run on higher octane fuels for perfomance.

Sorry, that is plain incorrect

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#518796 8-Sep-2011 22:09

TheUngeek:
nakedmolerat:
corksta: Yes

i am surprised, i was told that new cars (toyota, kia, hyundai, subaru, honda, volkswagen) should be able to run on unleaded '91, '95 or '98 with no issue. 91 is cheaper and more economical if you driving less than 60km/h. if you go on motorway and driving >80km/h, it is better to run on higher octane fuels for perfomance.

Sorry, that is plain incorrect

Not necessarily some newer cars, like my mums 2010 suzuki, the ecu is able to compensate between petrol types by looking for detonation and pining, that will then adjust the fuel pump flow.
e.g. there is no real difference between 91 and 98 that makes it worth while apart from it being a cleaner burn.

My 1999 subaru b4 rsk which I've done a single turbo conversion, rebuilt the block intake etc had an instant detonation after Id completed all the mods. it ran fine on 98 + some octane booster but anything less would cause detonation. The link ecu has now been retuned for 98 octane but will run crap on anything less than it.

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#518799 8-Sep-2011 22:18

s.joseph:
Not necessarily some newer cars, like my mums 2010 suzuki, the ecu is able to compensate between petrol types by looking for detonation and pining, that will then adjust the fuel pump flow.
e.g. there is no real difference between 91 and 98 that makes it worth while apart from it being a cleaner burn.

My 1999 subaru b4 rsk which I've done a single turbo conversion, rebuilt the block intake etc had an instant detonation after Id completed all the mods. it ran fine on 98 + some octane booster but anything less would cause detonation. The link ecu has now been retuned for 98 octane but will run crap on anything less than it.

1.yup.

2.spot on, it is important to differentiate between recommended and required fuel. read the manual for details. they normally state that the car must run on unleaded and recommended for higher octane level for performance. you will not notice any performance difference between '98 and '91 if you are driving around town, ie less than 60km/h.

TheUngeek

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#518804 8-Sep-2011 22:30

I'm sorry but you are incorrect. There is a massive difference between 91 and 98.
The speed you drive will not effect the type of gas needed. I've been over it in this thread already.

Running a car that is tuned for 98 on 91 will show a massive difference at any speed.

s.joseph

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#518805 8-Sep-2011 22:34

yes on some older cars, but not on many modern cars, the ecu mostly compensates for it these days. Ive tested it on my mums suzuki twice on 91 and then 98 and there is minimal difference if none.

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#518807 8-Sep-2011 22:35

Yeah if you read back my previous posts I cover that. It is applicable to some cars, but not all.

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Batman

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#518819 8-Sep-2011 23:17

oh dear this is turning into a use GTX 480 460 or 420 (sorry assuming they all exist) ...

depends on which game you play. if the frame rate maxes out (assuming it maxes out) on a 420 then using a 480 is overkill. some people say a 460 will compensate for a game that "recommends" 480 ... yes but you are getting a lower frame rate.

assuming "knocking" is like jerky graphics ... some games will knock with anything less than GTX 480 on certain resolution/settings ... those cars tend to be jap turbos.

of course some people don't care what frame rate and resolution as long as they can play the game.

having said that higher octane is said to be cleaner and in the long run (10's to 100's of thousands of kms) causes less dirt in the internals of the engine. myth? how much time and money does it cost to do a controlled experiment!

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#518828 9-Sep-2011 00:35

Thanks for the advice and debate so far guys! I might try a few tanks of BP Ultimate and see if the extra cost can be offset by gains in fuel economy/mileage. If it can't be justified I'll stick with 95!

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