does super unleaded make a difference?

[RAFkev]

I know this has prob been asked a thousand times before but i cba searching!

had a bit of a "debate" in work today but no one seems to have a definitive answer.

What are your ideas on it?

Kev

[smiith]

yes....

[smiith]

higher octane, burns better + faster = abit more power

[RAFkev]

yes....

care to elaborate!!!???

[RAFkev]

higher octane, burns better + faster = abit more power

there it is! lol

[WestCoastJosh]

I heard it cleans the injectors too??

[Peejous]

On a VTR or lower powered engines not really.

On high performance engines with more power yeah it does.

[Alanapone]

I notice a bit of a differance between the normal 95 ron compared to the 98 ron. the best is 98 ron with some of that NOS octain booster! you will notice a difference than:)

[RAFkev]

On a VTR or lower powered engines not really.

On high performance engines with more power yeah it does.

Why?

I have a thirst for knowledge sometimes! lol

[WestCoastJosh]

On a VTR or lower powered engines not really.

On high performance engines with more power yeah it does.

Thought that. For saxo's its the 1.4 and vts that get better results using super unleaded i think. higher compresssion

[wicked-vtr]

I notice a bit of a differance between the normal 95 ron compared to the 98 ron. the best is 98 ron with some of that NOS octain booster! you will notice a difference than:)

i have a bottle of that nos octane stuff, is it actually any good? i thought it might be some shitty gimick and end up damaging my engine

[smiith]

Because a VTR engine doesnt produce enough power anyway, for the gains to be noticeable. On some cars such as Imprezza's and Evo's, they are mapped to run on the 98ron stuff, because that is standard fuel in japan, so all the imports are built to run on it :)

[smiith]

i have a bottle of that nos octane stuff, is it actually any good? i thought it might be some shitty gimick and end up damaging my engine

probably wont feel any extra power, maybe a few milliseconds knocked off 0-60 at the most, at best it will clean your injectors abit, but dont use it too much, or it will wrot seals

[NICK2506]

Because a VTR engine doesnt produce enough power anyway, for the gains to be noticeable. On some cars such as Imprezza's and Evo's, they are mapped to run on the 98ron stuff, because that is standard fuel in japan, so all the imports are built to run on it :)

some guy on the internet has a mk2 golf with an audi S2 engine in, and he has different saved maps on his ECU for each type of petrol, bp 98, bp 95, shell 98, shell 95 etc. crazy!!

[Gabbastard]

Higher octane doesnt "burn better"; it allows use of more advance before knocking.

[M1VT]

some guy on the internet has a mk2 golf with an audi S2 engine in, and he has different saved maps on his ECU for each type of petrol, bp 98, bp 95, shell 98, shell 95 etc. crazy!!

lol,MK2 GOLF POWER
Mine gets the cheap nasty stuff,its old n slow
it deserves no better

[VTRelite]

NOS octain booster! you will notice a difference than:)

take it you didnt see the fifth gear test when they tested a load of the octane boosters and there was an average power loss of 2%

http://www.youtube.com/watch?v=2jbcCr2ll3c

[ryanmt]

Higher octane doesnt "burn better"; it allows use of more advance before knocking.

what he says, the higher octane resists knock better.. so you run more advance and make more power. If you dont remap it for the fuel then gains will be minimal.. maybe just a little bit of mpg due to it being of better quality or something.

[Colin]

Higher octane doesnt "burn better"; it allows use of more advance before knocking.

True.

The more octane you have and squeeze with oxygen on turbo cars, the more power. As with forced induction your compressing the gasses and fuels more, creating a more violent reaction.

[Easty]

My Car is mapped for 98, as are many other "higher spec" cars... especially Jap ones

Wouldn't make much if any difference on a VTR . VTS I wouldn't have thought.

[carter]

i can feel a big difference in the beemer i try to put it in as often as i can.

[Mr_X]

In a saxo nope, in a scooby/evo yep

[Dasher_VTR]

on my cammed VTR it did make a difference, on my MR2 it doesn't really notice that much even though it seem to really like sainsburys fuel lol.

[VTSTomE]

When mapped for high octane is when u can tell the difference between the 2, if i put 95 ron in mine idles very badly and doesnt fire properly when i put my foot down.

[Mardgee]

On a standard saxo no, if you have it mapped to the stuff yes it should. jap imports are mapped on higher ron than what we get over here so they will run worse than in japan on it but better than normal unleaded. The only way for super unleaded to give full gains or any is for the car to be mapped to it or be the fuel its supposed to run on standard.

[Alanapone]

i have a bottle of that nos octane stuff, is it actually any good? i thought it might be some shitty gimick and end up damaging my engine

I used it and it felt a bit better, I usually am very pesimistic about things like this but honestly... in my 98 reg VTR using shell 98 ron fuel and the nos road octain booster, it felt a little bit quicker.

take it you didnt see the fifth gear test when they tested a load of the octane boosters and there was an average power loss of 2%

http://www.youtube.com/watch?v=2jbcCr2ll3c

Soz dude but i won't even watch that clip as fifth gear is a bunch of toss... and that's besides the fact that i don't care if someone tells me something is good or bad, I'll try it and if it works i'll use it again (car wise). This stuff deffo made the car run a bit smoother and as you can see from the post above, i don't normally think stuff like this will make much difference but "for me" it did so i'll deffo be using the 98 ron shell fuel and every now and again, i'll dump some of the nos octain booster in there too. :)

Anyone that reads this and is thinking "should I or shouldn't I?" just try it and see for yourself.

[Tommo87]

High octane fuel will only make a difference if the car is mapped to run on it. My eg6 import was mapped for japanese fuel which is 100+ so the best i could do was Shell V-power at 99 so that is all it ever got run off and my Accord has a sticker on the inside of the fuel cap saying to run 98+ octane only so again my Accord only gets V-power.
Anything else and the only difference is psychological 'it says it gives more power therefore i can feel a difference' just like putting a new exhaust on do you really think you'd feel 6-7hp in any car.

[JamesR]

Sorry for the epic bump, but have been reading into Fuel and octane ratings a lot:

Should clear a few things up:

"The higher the octane rating, the slower the fuel burns. High-performance engines typically have higher compression ratios (and hence longer piston strokes) which requires higher octane (slow burning) fuel to allow the piston power stroke to complete before the fuel is completely burned. If the fuel burns faster than the downward movement of the piston allows, then the pre-detonating fuel results in a loud "knocking" sound and vibration. A lower-performance engine will not generally perform better with high-octane fuel, since the lower compression ratio is fixed by the engine design."

[SaxoKez]

theres a thing on fith gear where they tested this, on shitty cars, makes about 1-3bhp diff, on higher performance cars such as scoobys, made like 13bhp extra, was all tested on rolling road, also improves torque

[JamesR]

Think it will only make a worthwhile difference if its mapped to run on that fuel. I have heard about it "going off" if left to sit for a while, as all the solvents evapourate or something :wacko:

[shaney_b]

take it you didnt see the fifth gear test when they tested a load of the octane boosters and there was an average power loss of 2%

http://www.youtube.com/watch?v=2jbcCr2ll3c

i seen that 5th gear and yep youre right mate! i fink the impreza gained abit of power tho iirc??

[stiffler69]

Likes of evos, scooby etc have knock detection in the ecu, they detect the fuel 95/97/99 etc and they adjust the map accordingly.

If your saxo has been mapped with super unleaded then the map has been altered to run with this fuel hence you will loose power if you use anyhing less, but i doubt saxos have knock detection built into the ecu to start with.

I could be miles wrong with this explaination but im pretty sure this is why most high performance cars run better and are recommended to be run on super unleaded only

[djmartin]

yes super unleaded is better. thast why jap imports should run on 100 RON. as thats what they get ran on over in japan.

its better in turbo'd or supercharged engines tbh.

resists knock better. knock if im correct is to do with the ignition/combustion of the fuel.
cleans the injectors
if the car is tuned up correctly you will get better MPG

most jap cars get remapped to around 97/98 RON as thast the UK's standard for super unleaded.

[VJOFurio]

Thought that. For saxo's its the 1.4 and vts that get better results using super unleaded i think. higher compresssion

For that, i'm going to try a couple of tanks of BP's high octane super fuel to see if it makes any difference!!

[ATFoxy106]

the reason some people will notice it or not in saxo VTRs and furios(it think furios not sure though) is that the early models (Blacktop engines) ran without nock sensors, the later silvertop engines all have knock sensors, for high octain ful to make a difference to MPI engines they require a nock sensor as an ecu can allow 5-10% self learning thus allowing it to run high octain fuel to maximum.

We run the peugeot road rally car on bp ultimate on road rallys and the Astra stage car on Carlos 100 octane fuel the astra is mapped to run on this and runs majourly shit without it, the peugeot runs ALOT better on BP ultimate, however it is quite well tuned for a fast road car. i would have to say that running on BP ultimate will prolong the life of your engine, the fuel is more lubricant heavy and offers a cleaning ability for the engine.

[djmartin]

yep thats the only fuel I use to BP ultimate.
113.9 at the moment tho lol

[saxokid100]

yep thats the only fuel I use to BP ultimate.
113.9 at the moment tho lol

good stuff that bud.............:y::y:

[ashleypink]

on the crx vtec it makes a diffrence with v-power in;)

[evans1089]

Very noticeable difference in my cupra.

[tobomoto]

i used bp ultimate the other week and it actually made my car feel more sluggish. maybe it was just a dodgy garage. i put some 97 from sainsburys in it and it seemed to run better than 95 fuel.

[Chuffy]

Just depends on what the ecu is mapped for

I've stuck in normal unleaded in my car just to see what it's like and it was a slightly juddery. As if it didn't like it.

Went back to V-Power and it was much better. Was most noticable when engine was cold

[Josh-VTR]

It makes a difference to your pocket! I filled it up by accident once was 1.21 a litre I was well annoyed!

[Chuffy]

It makes a difference to your pocket! I filled it up by accident once was 1.21 a litre I was well annoyed!

Ah joshlunn, will you ever learn?