new shell OCTANE 100

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Originally Posted by aaronng

The only problem with G-Tech testing is that you have a gap of a few days in between tests in order to empty your tank... :(

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This is not a problem at all if it is not a 'timed' run also I'm ultra patient! - I was suggesting about max G-Force pulled during in gear acceleration, which gives a good consistent reading everytime as long as the G-Tech / G-Sensor in RSM is levelled correctly.


If the G-Tech meter has 3D X/Y/Z accelerometers and automatically calibrates and calculates even better.



i.e. when I was driving my S15 with small mods, but no ECU, full tank, at least 2nd tank of new fuel being tested (no point putting in 1 tank with remains of other fuel IMO?). Put Mobil Synergy 8000 in, consistently pulled 0.02G in 3rd gear more than Optimax 98 and BP Ultimate 98. Note this is std ECU.

When tuned with PowerFC, Mobil Synergy 8000 could take more timing as well, hence more power. I find Optimax 98 better than Ultimate 98 in Turbo car, I wouldn't be surprised if in the EURO Accord things would be different again?


We or I should say I just don't understand how the fuels work!!

Got to rely on the equipment to test!



The only issue with G sensor test with EURO is - not really sure if it is sensitive enough to pick up any differences between the fuels.

When the Synergy 8000 pulled barely 0.02G more than other fuels on the previous S15 200sx, it was obvious already from 'seat of pants'.




I honestly can't feel much between Vortex 95/96? (Vic) and Optimax 98. I THINK Shell Optimax 98 pulls very smidgetly better than Shell 95 though on the EURO... might be real, might be placebo effect haha! :wave:

As long as it contains ethanol, I will not use it on my car. Even if it is safe to use, it is lower quality stuff. The gain in performance of the 100 octane will be offset by the 2-3% loss in performance and economy (as quote from Honda) of the ethanol

Give us the unblended 100 octane. It's called market segmentation. There are people willing to pay for better fuel, despite everyone's complaints about rising fuel costs.

Hey.... honestly I don't understand why we shouldn't use Ethanol blended fuel.


It has higher Octane level. (Yes I admit Shell shouldn't be selling Extreme more than Optimax 98, using Ethanol as a cheap Octane enhancer.)

The Ethanol component burns better, completely.

An Ethanol blend can give better performance due to above two reasons in theory, but also might not. I'd put it on a Dyno-machine before making conclusions.

Ethanol component burns cleaner. Less pollution.

Ethanol IS renewable energy.

Producing Ethanol from vegetations, even when considering processing and embodied energy, still ends up with final Ethanol product being energy positive. All cars should run on 100% Ethanol!


Ethanol at approx. 68% of contained energy level compared to regular petrol, when used at a 5.0% blend will only decrease fuel consumption at 1.6%. But only on theory and speaking purely in terms of embedded potential energy.

In real life, because Ethanol blended fuel will burn slightly better than regular Petrol, it might achieve same or even higher mileage when the ECU compensates for this. Again, road/dyno testing has to be carried out before making a conclusion.

No ECU adjustments on older cars however.

The only people who have done these testing namely V8 Supercar Teams seem to carry the consensus that they show positive results in terms of power. As for economy some tuning has to be done from my interpretation. Yes they're Shell sponsored, how believable can it be? Well it may just be that they're correct.

But then again the V8 Supercars are highly tuned.
Which might not apply to our cars, which runs different Air Flow Meter/ECU designs, cruise mode vs full throttle mode, etc.



ANYWAY - I DON'T THINK WE SHOULD DISCOUNT THIS FUEL YET, UNTIL FULL TESTING HAS BEEN COMPLETED.

Ethanol is the way to go for the future. But Shell I reiterate shouldn't be selling this fuel at higher price than Optimax 98 IMHO.

one thing that is not mentioned above is the down side to using ethanol blened petrol. I have seen first hand the damage done over an over again in outboard motors. You see the problem lies with the alloy an lil plastic parts most commonly found in outboards and lawnmowers but also some newer car motors.it just litrally eats them away with corosion.
Another major factor we find with the outboards that would not be so noticable in cars. Is that most regular fuels last about a month an they so 2 months later when u run your boat it runs like shit. however optimax last upto 3 months stored we only tell people to use optimax

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Originally Posted by A.G.System

Written and authorised by the People For John Howards Dodgey Fuel Propaganda

I mean seriously dude have you asked them about becomming an official spokes person instead of Dick Johnson?

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I think the government has tapped your phone line and agents have now surrounded your house.

btw any of u guys have JDM engines like, JDM b16a, b16b, b18c used it?
and how does it feel?

If your engine was tuned for 100 octane originally, then Extreme should let your car run back at original timing. Using 100 octane over 98 won't give you a power boost. I think it's a placebo effect. But when you are using other mods such as turbos, upping compression and leaning out mixtures using a programmable ECU, then Extreme will help. The extra power comes from the mods, not the fuel. The higher octane will let you run with those mods without preignition.

u guys tried the fuel from UNITED ? i duno if its available in other states but in MELB they have quiet a few.

united 95 wif 5% or 10% (i forgot) ethanol is 4cents cheaper than normal 91unleaded
they have boost98 also but thats same price as normal BP ultimate / optimax

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Originally Posted by ek4-guy

one thing that is not mentioned above is the down side to using ethanol blened petrol. I have seen first hand the damage done over an over again in outboard motors. You see the problem lies with the alloy an lil plastic parts most commonly found in outboards and lawnmowers but also some newer car motors.it just litrally eats them away with corosion.
Another major factor we find with the outboards that would not be so noticable in cars. Is that most regular fuels last about a month an they so 2 months later when u run your boat it runs like shit. however optimax last upto 3 months stored we only tell people to use optimax

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Yeah thats all true, but ethanol has more oxygen in it than ULP or PULP so its going to liberate more power as there is greater oxygen in the burn to encourage more complete combustion. If you are the type of person who only owns cars under warranty there is no issue for you as the corrosion will either take longer than 3 years to manifest or will be repairable under warranty anyway. Dodgy news for used car buyers, but I can see a market for it for new car buyers, especially as its cheaper.

If buying a car as a long termer I wouldn't use it without modification to the engine internals first. Holden sell cars to NZ with different alloy engine internals to combat corrosion from the ethanol blended fuels available in NZ. They cost more for this change, but the change ensures they don't fix warranty corrosion all the time.

The oxygen in ethanol doesn't liberate into O2 form to produce more power. Ethanol doesn't act like nitrous oxide in combustion engines. You are burning ethanol directly, not producing O2.
C2H5OH + 3O2 --> 2CO2 + 3H2O

Every ethanol molecule is gobbling up 3 O2 molecules. And the combustion of ethanol gives less power than when burning pure petrol.

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Originally Posted by aaronng

The oxygen in ethanol doesn't liberate into O2 form to produce more power. Ethanol doesn't act like nitrous oxide in combustion engines. You are burning ethanol directly, not producing O2.
C2H5OH + 3O2 --> 2CO2 + 3H2O

Every ethanol molecule is gobbling up 3 O2 molecules. And the combustion of ethanol gives less power than when burning pure petrol.

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Glad to see we're dealing with one of my favourite subjects -- Chemistry. :D

Ethanol, as you mention does not contribute it's bonded oxygen molecules to further enhance the combustion process. However, I fail to see how you come to the conclusion that because ethanol combustion (in the presence of sufficient oxygen) is gobbling up more oxygen than the most common compound in fuel, octane (formula C8H18) that it somehow reduces the ability of the fuel to act optimally.

One C8H18 molecule with ignite with
2C8H18 + 25O2 --> 16CO2 + 18H2O

Thus two molecules of octane will react with 25 oxygen molecules. Using your arguement, octane would be an inefficient fuel compared to ethanol (which we know is not the case).

What isn't being addressed here is that the combustion within an engine is not optimised for the least amount of oxygen consumption, but instead for the most amount of expansive force (to power each piston) per unit volume of fuel used.

This expansive force is provided via the combustion process by the fact that the products occupy more volume than the associated reactants, both by there molecular properties (octane is a liquid at room temperature, with high density compared to CO2 and H2O - steam - at high temperature) and the temperature change as a result of the enthalpy of reaction (basically, the reaction creates heat).

If we look at enthanol, we have a lower heat of combustion than octane. Also, ethanol has a lower density than octane at room temperature. Overall this results in a reduced density per unit volume of fuel to produce expansive force.

For more on combustion go here

Ok, guys,
I finally found the DYNO result using optimax vs 100 base on Hondata master-James.
Go to his site and it explains www.racefuels.com.au/dynodetail.

More etahnol will give no more power but rather a detonation agent(based on James conclusion). But 100 still will>98 in performance once tuned.