Facts about high octane petrol

[Mikgwerd]

US and EU have different octane ratings systems noobs, it's why you see higher numbers vs the US numbers

[sickturboguy]

suburoo impretsa ?

[paulhunter123]

its a shame the imprezzas are good cars with great engines but they have such a council estate image.

[pimpmyforklift]

my toyota corolla 1979 ke55 has done 1million 2hundred and 56thousand km"s on the same engine , same mechanical fuel pump . My point is fuel these days are better refined arnt they ? ! , then why has my car not sht its self from all the crapy fuel in the past 30 years , most of my friends cars are newer and have had troubles beyond thoughts . so are cars getting weaker or is the fuel worse for the engine . cars get better in tech as we move forth ( dont they ! ) or made to last warranty !

[ajuk1]

Does the Clio have a knock sensor?

[ajuk1]

Did all the cars have knock sensors?

[aikenforjeff]

i do NOT want anything developed by a Formula 1 team. I have a Honda Accord haha

[TheInsider3000]

0:19 wow seeing the price on that sign in the background really hurts

[sebzero2]

shell optimax is best its prooven here, and i notice the diference inn my 500hp rx7fd3s. now hush

[REPOMAN24722]

Well your car wont last as long on 91 as it will on 95 or higher in Australia we have 91, 95 and 98, bp ultimate is 98 here and I dont buy shell crap it doesnt get me very far. y friend runs his car on 91 and his cars engine is the same as mine his is worse off than mine i use 95 because the manual states that lower than 95 will damage the engine the engine is a SR20DE.

[yellowmusicfreak]

Wow didn't know European fuel starts at 95 octane, no wonder its expensive, and here I always compared it to our 87, or in some states even 85 unleaded

[GunsOfThePhoenix]

@yellowmusicfreak The US uses a different rating scale, so its the same fuel but, its labeled differently. The highest we have is 97 octane unleaded which you can only find at select luxury gas stations or race tracks. There is also 110 octane leaded fuel.

[irocx29]

@yellowmusicfreak You or so Right ! { @Yellow,m,f,}

[Pinin500]

The subaru is mapped for higher octane so will suffer reduced power with lower

octane, a car mapped for ordinary unleaded will run happily on either, simple.

Although my alfa twincams do run smoother on V-power but at £1.50 ltr i will be

sticking with ordinary unleaded, still goes like a scalded cat so not a problem.

[x251kx]

damn the highest we have here in california is crappy 91 octane.. but just started running a 50/50 mix of 91 and E85 and my sti is loving it!

[kylereece22]

Thank you for posting.

[zooley]

wtf UK's average is 95 compared to the US's 87...

[HondaKillerG]

@zooley Slightly different grading system if I'm not mistaken.

[Aaroenz0r]

@zooley And here in Holland the lowest you can get is euro 95

[toyota420xp]

wow on the imprezza

[grabedigger]

Well...at least my 81bhp car will have a cleaner engine...

[PlatoTacitus]

Well, good video, but no surprises there....

In short: if You have N/A car with cr(compression ratio) less than 11:1 use cheap regular fuel(we call it 95 here), higher octane won't make any difference on low cr unmodified engine. if You have forced induction car, ALWAYS use higher octane fuel, it might not give you any more power, but it could save your engine when running lean or when having boost problems.

[1MPALASS]

so does the lt1 appreciate the difference and give me more trq and hp ?

[MiddleEasternBorder]

Just this week, the 100 octane fuel became available and is now serviced in Petron stations here in the Phils.

[Username93611]

Wow. 95 octane is the baseline in Europe? It's hard to find above 91 octane available as the highest end gasoline in many parts of the states, and the best you're going to find is 93 or 94, tops.

[67tr876]

BRING BACK LEADED FUEL ! FUCK THE EPA

[Username93611]

@67tr876

Yeah. That's what we need to do. Not only spew millions of tons of carbon into the atmosphere every year, but add thousands of tons of vaporized lead to the environment... everywhere there are cars.

If having a dilute mixture of chlorine gas (Just a smidge mind you. Only enough to cause some minor burning) in the interior of your car gave it an extra 10hp, would you be first in line to sign up?

[67tr876]

@Username93611 ya i would

[TheBartman47]

@67tr876 Leaded fuel simply isn't required anymore since all engines have hardened valve seats. Only older engines with cast iron heads and cheap valves would benefit from lead. The lead actually fills in the microscopic holes in the inferior metal used in older engines.

[switchgrassfuel]

Tun your car to run E85 or E98 ether one will beat any one of those fuels. E85 is 105 octane and sold everywhere around Southern Minnesota and it is the cheapest fuel around.

[blyndrotor]

@switchgrassfuel

Yeah true but make sure you have a fuel system that can handle the need for increased fuel delivery. Especially if you are turbocharged. You can whack in a fair bit more timing and get power and torque gains everywhere (especially in the mid range) but you need to increase flow.

[switchgrassfuel]

@blyndrotor that is very good advice. thank you.

[blyndrotor]

@switchgrassfuel

No worries. Saw an article on this and they were tuning a skyline for E85 and had good results but had to up fuel delivery which meant drinking more fuel. Don't know how much of a trade off it was.

To all reading: It's a good idea but if you run out of fuel flow and get a big lean out on boost it could be costly. Upgrade your fuel pump.

An ounce of prevention.

[jamesthq]

@blyndrotor Im having my celica vvti upgraded to 400bhp and I've just had a rebuilt GTFOUR engine conversion done and Im watching this cause I can only use 97 or higher otherwise it'l wreck my engine same as diesel would. Picking her up after the new year once the weather is better but maybe I hsould get shares in BP since Im going to be fueling up from there from now on

[blyndrotor]

@jamesthq

Whats your point?

Do you have a question or just filling me in on your plans.

Have fun with the torque steer. That sort of power level in a FWD is a bit pointless if you cant put it to the ground.

You may want to look up WTF Performance in Western Australia. Doing some interesting things with Toyota 4s and v6s.

I prefer my Rotors and Toyota straight 6's.

Toyota never did give much choice on the conversion side of things when it came to FWD but RWD is a different matter.

[DarkKnightBob1o1]

High octane is meant for high perfromance cars.

if your car can't handle 200-300hp then it bloody won't be able to handle a petrol designed for that engine.

your 1.2 litre will be CONSTANTLY running rich from the fact your ECU will most likely get confused and add more fuel to deal with the lack of ignition.

All you do is muck up your engine

Also vice versa you will get knocking on a high performance car fouling up your electrics.

[Skid00everest340]

in sweden we got 95 octane 96 octane 98 octane and ethanol E85. diesel city diesel acp diesel trucking diesel. and red diesel wich makes the engine go smooth like a huming bee BUT iligal in sweden but who the f"#ck cares just drive over to finland fill her up and cross the border when they dont have any controls at the tull stations

[oddsource]

my motorcycle has 12:1 it needs a lot of high octane expensive though. I just buy pump gas super and add additives. It works fine no knocking :)

[ejuoi]

That goes for every car that is recommended for premium, not just Subaru.

[ejuoi]

Wat so in Europe they're running around with 95/98 octane while here in the U.S we're with 87???

[HSDDTS]

Why does the old guys head move around so much! Fark me

[gahloot]

Is that guy a fucking raccoon!

[adfadfewfrewafawefaw]

its funny how he has no idea what hes talking about

[Salpeteroxid]

Is he on amfetamin?

[1700iDiGuy]

bring back 98 RON lead!! my car pings and splutters on this shitty eco tree huggers unleaded!

[Topazman12]

Regular Gasoline: 18$ - 20$ per week. High Octane (Premium): 15$ per week. Same average distance. Car 2004 Nissan Sentra 1.8L engine. 4 cyclinder. Guess what I am buying Hi Octane gasoline.

[kostis007]

higher octane doesnt give more power,it makes the engine work properly so you wont lose power,and that ONLY if the engine requires that fuel

[nubbtard]

Whats interesting is (if I have my facts correct);

The first car was an N/A engine.

The golf GTI uses a turbo.

The scooby uses a turbo too.

I am wondering if that made a difference (I have an RX8), this is NA so I dont want to waste money just for +1-3hp.

The gains they got on the scooby were pretty damn good though !

[mstngs351]

@nubbtard you won't see a gain unless your car calls for that high of an octane rating. What happened in this vid was the Subaru and VW were loosing power because they needed better gas. Lets say your car needs 90 octane gas. If u use 87 it will loose power because the computer in the car will dial back power so the 87 doesn't ignite too soon and damage the engine. If you use (say) 92 then your car will make full power because it wont have to detune your car. RX8 =10:1 compression+requires 91oct

[Krakaklat]

Did the golf hit the building at 1:03 ?

[UberApe]

@Krakaklat It did look bloody close. But then it came out after fine.

[L3g4cyTT]

Tesco 99 ftw

[weblefeck]

It would have been interesting to see the results between Supermarket slops and high quality, but normal octane fuel such as Shell or BP. I find my car runs best just using normal, but better quality fuel.

[devo4g63]

What a knob!!!!!

[ecksdeechree]

Was this video was sponsored by Shell?

[johnmiller1985]

it was made by the Discovery Channel so only fact here

[iomag]

Hole, not whole...

[mattmatt115]

I haven't watched this video, and i won't, but i will tell you this: The only way higher octane fuel will boost power is by tuning the ignition the form of advancing timing and not getting detonation (dieseling), inreasing compression ratio.

Those of you with Turbos or Superchargers, and too cheap to buy high octane fuel, you will be kicking yourself when your blast a whole in your piston, or the wrist pin shears off the skirt, or the connection rod just snaps in half.

[enginemasterbuilder]

man there are too many factors to get this right. it should be done on a engine dyno. and atmospheric conditions Must be the same

[johnmiller1985]

i wouldn't really say thats rite. if you think about it when you go to a dyno you engine is in your car. so you want to know what the stuff does when in a running car.

[fridogg]

it has to do with compression rating in car engines

[ashccc11111]

its not a chassis dyno at all.

stupid journo's

[bwade88]

i wonder if my ka24de can apreciate the difference,i hope so because i feed it 93

[marooncorsa]

to me petrol is petrol is petrol it all burns the same way and it all pollutes the sky

[kave999]

thats coz you drive a corsa... if you had a jap car then you would HAVE to run super because the compression ratios are different.

p.s. you could prolly run your "petrol corsa" on diesel and not tell the difference haha

[marooncorsa]

i generally try to find the best fuel i can, i.e from texaco. Do yourself a favour, stay away from tesco fuel. i also put redex in indefinatley too. the results? The emissions were cut exactly in half.

I've been buying fuel from the same station, from the same pump now for nearly a year.

[fordmoparguy]

the higher compression ratio you have in an engine the higher octane you HAVE to use! - a lower octane rating is easier to ignite-if you have a high compresion enigne on low octane the fuel will prematurly ignite because of the heat of the compressed air and fuel before it has completed its full stroke which streses the shit out of your piston assembly

[mugametal]

yes

[weblefeck]

and as a result sounds like a bag of spanners! lol

[gpzDave]

@fordmoparguy and if you have a large aftermarket turbo, which makes the compression ratio rocket, you will have to consider 106 race fuel!

[TheCorollaXRS]

@fordmoparguy

Not always true. Engines with with direct injections have very high Compression ratio yet they can take 87. Example GM LLT, Toyota 2GR-FSE, 2012 hyundai accent... etc

[CVRealMan]

@fordmoparguy then you melt your pistons! YAY! :p

[auglendsveien]

anyone know where that Shell station he filled up is?

[Timar123]

That's cool :) now I know what to get when I get my STI.

[muttgusse]

petrol sucks

[THUNDERDOMEXXIV]

now i have corolla 85 hatch back i run it on 95 yeah it goes good my car use to run on 92 super, runs very good. now i run it on 98 bp ultimate damn wat a huge difference.

[publicanimal9]

Used to run mine on BP Ultimate then changed to V-Power - another huge improvement!

[LancerMRWong]

@publicanimal9 V-Power is the best.

[Dante1969]

30 hp lost! Infact the golf gti is 200 hp and not 172

[type17]

Again, 200 BHP is quoted at the flywheel (most manufacturer's figures are) - measured through the gearbox and front hubs, 172 sounds about right.

[marccobley]

good video could have told torque on other cars but it did raise alot

[cgd2007]

276 at the flywheel dude...you're gonna lose some of that ...even with a chassis dyno

[PAULABCDEFG12]

So its probably 276 at flywheel with reg 95 then? So its probably over 300 BHP at flywheel with optimax. Unless manufacturers give figres with optimax.

[cgd2007]

more than likely they optimize the fuel and lube so that they get the best result....marketing man...all about the marketing

[PAULABCDEFG12]

249 BHP from an 06 STI? It should be 276.

[THUNDERDOMEXXIV]

yes i know but he aint a mechanic yes it should be 276 hp straight from STi in japan