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925 posts

Ultimate Geek
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  Reply # 518398 8-Sep-2011 09:09 Send private message

ok, what i was getting at though is a lot will detune themselves to cancel out detonation (you may still get slight pinking) and running them on 98 will allow the ECU to run it at better efficiency.
Models such as I suggested will do that, they run ok on 95 with no dentonation, maybe some slight pinking under certian conditions. But they will always run better on 98.
Basically if it's a sporty model in Japan it will be made to run on 100 octane.

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  Reply # 518400 8-Sep-2011 09:16 Send private message

TheUngeek: ok, what i was getting at though is a lot will detune themselves to cancel out detonation (you may still get slight pinking) and running them on 98 will allow the ECU to run it at better efficiency.
Models such as I suggested will do that, they run ok on 95 with no dentonation, maybe some slight pinking under certian conditions. But they will always run better on 98.
Basically if it's a sporty model in Japan it will be made to run on 100 octane.


Sure.  But the only reason they retarded their timing in the first place was because they detected detonation.
Putting 98 in stops the detection of detonation and the engine un-retards itself and you get the full performance the engine is capable of.

I still stand by my statement that Higher Octane doesn't make your engine perform better.  It could well make your engine stop under-performing.  Which to most people would appear to be a performance improvement, which I what I guess you're trying to say?





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849 posts

Ultimate Geek
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  Reply # 518402 8-Sep-2011 09:20 Send private message

Given that how you drive, how much additional weight, your type of driving (motorway vs town) and whether you have the airconditioner on will have more of an effect on the fuel efficiency of the vehicle than the fuel you use.

I track every tank of gas, and mileage for my Nissan and my scooter, and neither show any particular variance in mileage (over 3 years) with different fuel (I tried three tanks each about a year ago).

Personally I think the age of the fuel has a much larger influence on the performance.

Jon 

925 posts

Ultimate Geek
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  Reply # 518404 8-Sep-2011 09:21 Send private message

It will allow it to run in its optimum design efficiency range is what I'm getting at.
Case in point, late 90s 20 valve Toyota Levin. Running on 95 gets roughly 500km per tank, runs fine
98 can see 600.
95 is a "can do" for alot of cars, whereas 98 is a "should do" on the same ones.
It depends on the car, a lot will run fine on 95 and show no improvement on 98. likewise some for 91 and 95.

925 posts

Ultimate Geek
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  Reply # 518405 8-Sep-2011 09:22 Send private message

jonherries: Given that how you drive, how much additional weight, your type of driving (motorway vs town) and whether you have the airconditioner on will have more of an effect on the fuel efficiency of the vehicle than the fuel you use.

I track every tank of gas, and mileage for my Nissan and my scooter, and neither show any particular variance in mileage (over 3 years) with different fuel (I tried three tanks each about a year ago).

Personally I think the age of the fuel has a much larger influence on the performance.

Jon 


Sorry, not so. If you have a car that needs 98 and run it on 91 it will make a huge difference.

And obviously  those vehicles are tuned for 91.
 

Hawkes Bay
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  Reply # 518418 8-Sep-2011 09:42 Send private message

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.




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  Reply # 518533 8-Sep-2011 13:23 Send private message

I have a VY V6 Supercharged Commodore. Never had 91 in it, but there is a noticeable difference in performance between 95 & 98. Not sure about economy. Economy is very dependant on how you drive with the s/c :-)

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  Reply # 518538 8-Sep-2011 13:35 Send private message

I find I get better economy using 98 instead of 95. Unfortunately when I convert the improvement to dollars it basically just covers the price difference.

When I used 91 the car seemed to run OK but it stuffed the oxygen sensors. My mechanic told me this was because it wasn't able to burn cleanly.

457 posts

Ultimate Geek
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  Reply # 518545 8-Sep-2011 13:43 Send private message

use diesel Wink
performs better
potentially costs less
better for the environment esp. biodiesel




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Ultimate Geek
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  Reply # 518546 8-Sep-2011 13:47 Send private message

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





Only if you can afford to buy a new diesel. 
And there is plenty of debate about biodiesel  

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Ultimate Geek
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  Reply # 518559 8-Sep-2011 14:01 Send private message

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





Only if you can afford to buy a new diesel. 
And there is plenty of debate about biodiesel  


yes plenty of debate on biodiesel but at least in NZ all Biodiesel is made locally and where it uses Canola/Rapeseed that land used isn't competing with food crops. I wouldn't use biodiesel if it was imported



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  Reply # 518562 8-Sep-2011 14:05 Send private message

xlinknz: use diesel Wink
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.

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  Reply # 518566 8-Sep-2011 14:16 Send private message

Watch this:

http://www.youtube.com/watch?v=dDHwCWdrtdg&feature=related

Short version is that cars with higher compression will make more power on higher octane. They'll also be more efficient (although that's not tested in this linked video)

Cheers - N

457 posts

Ultimate Geek
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  Reply # 518573 8-Sep-2011 14:24 Send private message

graemeh:
xlinknz: use diesel Wink
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 ?





Hawkes Bay
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  Reply # 518600 8-Sep-2011 15:13 Send private message

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




My VE might not like that. 




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