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How Much Power Loss Using 91 Fuel

ascenion24

By ascenion24,
in Engines & Forced Induction

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ascenion24 Enthusiast

ascenion24

Posted
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Not saving 20 a week on fuel, costs 20 dollars to fill the tank up. So saving 50 a week on fuel. Probably a whole lot more depends how much driving I do.

And fair enough, i know the arguments, maybe ill buy a V8 instead, still tossing up what to do.

How the hell is running 91 fuel going to cause any damage if the car is tuned for it? the only thing running 91 fuel will do if its tuned right is a loss of power, thats it.

I was just trying to find out how capable the skyline computer system is in pulling out enough timing to make running 91 safe before a custom comp could be installed to set it up right.

Id love to know how running 91 ron with the right tuning could do damage?

Edited by ascenion24
Beer Baron Grand Master

Beer Baron

Posted
Posted
assumption on my behalf, guess 100ron is standard then

lol! it's the other way. japan is not a magic land with gold plated pumps! Yes they have nice fuel available, but it's not cheap, and it's not 'standard'. it would be crazy to be driving around tokyo in your toyota hi-ace on 100RON $2.50 a litre fuel! They don't use quite the same rating system, but as best I can recall regular unleaded is about 93 or 94 RON. most 'performance' models run fine on that, but some are more suited to japanese premium of either around 98, or 100RON. but any standard skyline will (should) run fine on 95RON premium. Don't forget these cars were made (mostly) in the early 90s, fuel quality and availibilty was not quite the same as it is now.

RellikZephyr Proficient

RellikZephyr

Posted
Posted

its not so much a loss of power with 91 RON ... more of cant make (high) power safely (that word again...detonation)

and...wait...your saying to FILL your skyline tank with 91 RON (regular unleaded) its $20?? so based on the assumption r33 tank is approx 50L ... your saying that fuel where you live is 40c/L

98RON is at very most 20c/L more than 91RON so based on 100L (whih skylines dont have!!) its only a saving of $20

RellikZephyr

Devils_Advocate21 Mentor

Devils_Advocate21

Posted
Posted

Here the dif between 98 and 91 bp fuel is only 10.5 c per L difference hell just shop a docket your fuel get 4c or more off thats the easiest way to COMBAT fuel prices if one is so concerned

Beer Baron Grand Master

Beer Baron

Posted
Posted
Inside the filler cap on my 32gtst it says minimum 95RON, what that is equivalent to here I don't know.

95RON = premium unleaded in most states. that sticker is most likely placed there during compliance by the aussie workshop.

ascenion24 Enthusiast

ascenion24

Posted
  • Author
Posted

yes thats right, i can get 91 petrol for under 40 cents a litre. from a familys workplace through his business, but im not suppose to get it but its family so he lets me.

Now can everyone keep on topic.

Obviously it says 95 ron minimum because anything less and it will start to ping/detonate whatever you want to call it. This is because of the timing the standerd computer uses.

But if tuned to run on 91 then it wont detonate, so how could it cause damage? fi you dont know anything about this then can you please stay out because this thread is just starting to get crowded with bullshit now.

RellikZephyr Proficient

RellikZephyr

Posted
Posted

well ok if specifically tune it to the 91RON then yes you shouldnt come by any problems... although when "spirited" driving you will still run a higher risk of detonation...and with detonation comes great detruction

also...you say with the money you save by gettin this cheap fuel you will mod your car...fair plan...but once modded you wont be able to take advantage of the mods because of the 91RON fuel i.e cant run high amounts of boost cause the fuel just isnt good enough

infact pretty much any performance mod you might chuck on would be a waste of that saved money

new computer...still has to be detuned to utilise 91RON

new turbos...can run high boost fuel wont cope

bigger injector and fuel pump...still pumpin 91RON so...detuned to suit

all the above with 91RON would give little to no power increase

might work well to save to buy suspension,clutch,zorst,bodykit etc...

but performance mods like above just wont increase performance

RellikZephyr

Sydneykid Grand Master

Sydneykid

Posted
Posted

Since you have not supplied any information on what mods you have, what mods you intend ot have, what tuning you have and what your usage patterns are it is impossible to answer this question properly.

Some things for you to think about;

A 91 ron tune on a Skyline is not very common, you may well be the first person that you tuner will have ever done it for. So it might cost you $5-600 to get it tuned for 91 ron as well as the $5-600 for a 98 ron tune. That cos tduplication re=occurs every time you do an upgrade and need a tune

If you want to swap between fuel, you will need to keep both sets of maps available for uploading. That means laptop tuning software (eg; Datalogit for Power FC's) and a laptop itself, of course.

Talking about 20 rwkw loss is excessively simplistic, think about HALF AS MUCH POWER at 3,000 rpm as being more indicative.

If you are thinking that the standard computer will save your ass, then you are right as far as that goes. But the knock driven rich and retard will KILL the performance and KILL the fuel economy. Much much more than a tune for 91 ron will.

So, fill in the information gaps and we can go from there.

:D cheers :D

Zas)-( Community Regular

Zas)-(

Posted
Posted

man just add some vegetable oil should be sweet makes your car pinge less and raises octane ahahahha

ahh well i've always tried using shit tight methods of 91 ron, yes it saves you money, some reason bp 91 ron fuel was better then the rest and through my experience of the ecu shitting itself after a month it was just crap and so many headaches and just MORE PROBLEMS!!!. :P

So i decided to run her only with BP ULTIMATE.

YES I CATCH THE TRAIN SO MY BABY GETS BP ULTIMATE i dun care if it says 95 ron as standard but based on past experiences, its always better to be safe then sorry p.s bp ultimate has less pollution too :laugh:

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