davyboy

Petrol - is such an emotional subject, people are bound to get upset.

Bartop

I hope that was delivered with a healthy dose of sarcasm

ARM-Scooby

well i will give it a go if some comes to the leicester area.

BROOKS1E

have a look at this web site ....www.imoc.co.uk it might help some ppl understand all bout fuel and its properties and all bout ron/octane ratings ...its heavy going but worth a look look under the tech section ...and no i dont have an MR2

WRXtra power

Could you just tell us what you found out? Went to have a look but didn't know where to start.

Pretty Plezzzeeee

BROOKS1E

Look here ok www.imoc.co.uk/technical/article/octane.htm scroll down ok there is lots of it will keep you busy for ages ....lol

WRXtra power

Thanks... Did anyone else actually know that RON = Research Octane Number meaning that "99 RON" & "99 Octane" are the same? Lets hope this will clear the air a bit.

Nice one BROOKS1E

BROOKS1E

If you are already using the proper octane fuel, you will not obtain more power from higher octane fuels. The engine will be already operating at optimum settings, and a higher octane should have no effect on the management system. Your driveability and fuel economy will remain the same. The higher octane fuel costs more, so you are just throwing money away. If you are already using a fuel with an octane rating slightly below the optimum, then using a higher octane fuel will cause the engine management system to move to the optimum settings, possibly resulting in both increased power and improved fuel economy. You may be able to change octanes between seasons ( reduce octane in winter ) to obtain the most cost-effective fuel without loss of driveability.

Once you have identified the fuel that keeps the engine at optimum settings, there is no advantage in moving to an even higher octane fuel. The manufacturer's recommendation is conservative, so you may be able to carefully reduce the fuel octane. The penalty for getting it badly wrong, and not realising that you have, could be expensive engine damage.

highlander68k

Verdict - Pressure regulator, which had been set at 3.2 bar @ atmospherice pressure, had suddenly dropped to just over 1 bar @ a.p. No known cause, nothing loosened. On it's way to manufacturer next week.

Lighting up - fuelling was slightly under desired AFR. Cabin noise is excessive and knock was not audible. There was no noticeable difference in power at that instant.

Brain dead - maybe

Engine failure - I have a power FC. There is no 'safe mode'/ automatic ignition retard. Are you sure it wouldn't blow?

boomer

It doesn't actually clear anything up!

I expect that many people on this board know what RON stands for. They also probably know what MON stands for. Both contain the work "octane" - and so does AON (Arbitrary Octane Number) which i just made up

Putting "99 octane" on a pump does not have any scientific or legal meaning.

Maybe someone should write to Tesco to find out for sure (but it won't be me, 'cos i won't be using the stuff).

mb

WRXtra power

Yes ok I noticed that after adding my last post. Not bothered anyway, this thread is getting old and boring. RON or Octane 99 I'm sticking with my clubcard points.

BROOKS1E

I didnt say it would clear anything up ...just that it MIGHT help ppl understand more about the science behind the ratings after all we`re not all rocket (fuel) scientist`s sorry next time i will keep out of things i know nothing bout

StickyMicky

LMFAO

StickyMicky

ps. has anybody actualy properlly tested it yet??

little'un

iTrader: (9)

I filled up with 99 octane last night and noticed a marked reduction in knock-link activity at high rpm and high load.

By the way the car is MY00 with TEK3, full decat, TD05.

It was 88.9p a litre, cheaper than my local Shell.

Mind you, don't really fancy the round trip to Camberley every time I want to fill up. Just wanted to test it!

Lin

StickyMicky

can anybody tell em if this fuel is safe for my engine

i will give the full spec for those who require it

97wrx on standerd ecu mapped for 100+ron
vf23 turbo swap
samco inlet
k&n pannel filter
sti8 fuel pump
full 3" decat
Dawse device running 1.4bar boost
recent NGK 7b plugs
full samco pipe set
scoobymonitor
7.5kg flywheel
fueling is at 875mv on the lamda @ full boost in 5th gear


runs 12 sec quarter miles if thats any help
seams pretty nippy and well setup to me, and most other people.

if its indeed safe for me to use, what about after i fit the ported headers, zerosports oversized uppipe and the lightend billet alloy crank pulley i have in the garage?

is it worth me useing this

StickyMicky

what octane fuel is your car mapped for and what were you comparing it with?

little'un

iTrader: (9)

It was mapped for Optimax, which is my normal fuel of choice.

Lin

StickyMicky

good, how much of a "marked reduction" was there?

optimax is supposed to be garenteed to be at least 98.6ron
can a increase of 0.4ron give a "marked reduction"?
is this reduction still in effect, and can you post back up and tell us what happens when you go back to optimax, ie: is there another increase in higher load "noise"

Dark Blue Mark

Pete, just a point on modifying / remaps - the Prodrive PPP upgrade for the STi is actually an ECUTEK remap so its no different to what others are doing by having TEK remaps done on earlier cars....

MB

little'un

iTrader: (9)

In general, when using Optimax I can get the two bottom green lights and occasionally the first orange to light up, when 'pushing on' in top gear

If I put BP Ultimate in the car, it goes off like a christmas tree in the same scenario.

Last night using Tesco Finest* (with clubcard points to boot! ), I could only get the KL to display background noise - which is full illumination of the first green light above 5000rpm at WOT.

Occasionally using Optimax, if I 'stroke' the car along the motorway in 6th gear, I used to see the bottom green led flicker regularly. Using the 99 I have'nt seen this "yet"!

I have'nt got any problems using Tesco fuel, other than the fact that it is a 30mile round trip to fill up.

In the next couple of weeks I'm fitting a PFC to my car....it will interesting to see if we can get any more ignition advance out of the Tesco stuff

Dark Blue Mark

I reckon its the cleaning additives in the ultimate causing "carbon related det" - have a search for that one Its the other form of det that's a little less known about...

MB

highlander68k

Only if you collect computer vouchers for schools and club card points :P

StickyMicky

now thats the kinda of stuff i want to know about, cheers
any mods scince your last remap which could affect ign?

little'un

iTrader: (9)

BTW - I get det using any SUL fuel!

little'un

iTrader: (9)

Hi

No new mods, exactly the same setup as when it was mapped.

Have always had a flickering KL with Optimax. My other half has had a listen with Detcans and it's only a light sparkle.

StickyMicky

wholesum info coming through

highlander68k

If you're going to fit a PFC, what ECU do you have at the moment and what fuel was it mapped for?

little'un

iTrader: (9)

TEK3 on the standard ECU mapped for Optimax.

aaronhowe

Just filled up with this a little while ago in my03 sti. Will let you know how it feels once i have taken it for a bit of thrash
probably need a couple of tanks though till it gets rid of all the optimax thats left in the tank.