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Opti E85R is a premium blend of oxygenated and non-oxygenated chemical molecules and it adheres to the oxygen specification of traditional E85. The non-oxygenated part of the fuel is comprised of high-quality hydrocarbons which have been chemically engineered for superior performance. As E85 is not available at service stations, the traditional way to produce an E85 fuel is to mix 85 volume % ethanol with 15 volume % 95 RON pump fuel. The RON of pure ethanol is reported to be in the 113 – 116 range.
Diluting the ethanol to 85 volume % with 95 RON pump fuel reduces the blend to a RON of 102-105 depending on the composition of the pump fuel. By using high quality non-oxygenated hydrocarbon components, Opti E85R preserves the high RON of ethanol and the theoretical RON of Opti E85R is calculated to be 116.
(Please note that ASTM laboratory RON measurements were not designed for highly oxygenated fuel blends and hence computational evaluation provides the most accurate assessment of RON)
Opti E85R was scientifically blended for competitors who chase records and are demanding maximum performance from their modified vehicles. In addition to having extraordinary anti-knock characteristics as described above, Flex Fuel is engineered to result in:
A faster combustion speed – leading to complete combustion and more power at high RPM’s.
Improved in-cylinder and exhaust gas temperature – The latent heat of vaporization of Flex Fuels has been optimized.
Cylinder air filling is promoted leading to an enhanced volumetric efficiency.
Lubricity and anti-corrosion additives have been added to protect your engine and fuel system.
Opti E85R is a consistent blend that will increase power and torque without any modifications whilst custom tuning will enable the full potential of Opti E85R to be realized.
Opti E85R is an unleaded fuel. It contains no metal additives and does not foul plugs. It does not harm catalytic converters and oxygen sensors.
Opti E85R is suitable for vehicles tuned for E85 fuel or higher.
Do not use any E85 fuel on tunes designed for pump fuel or tunes not calibrated for E85 fuel.
If you are on pump fuel, it’s best to run as much fuel out of your tank as possible (estimated distance to empty should read “0” or “……….”) before switching to Opti E85R. On many vehicles, as soon as your instrument cluster shows “0” distance to empty, your fuel tank will still contain 1 gallon (3.8 L) of fuel.
It is recommended that your tank should be filled to the maximum to dilute the effect of the residual fuel in your tank. Take care and ensure that all dead volume fuel (fuel in the lines between you LPFP and injectors) is used up before applying load.
Containers of Opti E85R should be tightly sealed and stored at ambient temperatures. It should be stored out of direct sunlight. Due to the hydroscopic nature (absorbs water vapour from air) of Opti E85R, it is not recommended for extended storage in your fuel tank. A good practice is to periodically switch out E85 fuel with pump gas. If you forced to keep E85 stored in you tank, its best to minimize the fuel vapour head space by filling your tank up to the maximum.
Firstly, some of the biggest companies on the stock market once had humble garage beginnings.
Google, Microsoft, Apple, Amazon and Walt Disney to name a few. Flex Fuel however, was developed in a fully equipped analytical laboratory. ASTM testing standards are used to characterize the physical properties of our race fuel and every batch of fuel produced, undergoes rigorous QC to ensure consistency and adherence to internal specifications. Rather than write volumes here, we prefer to let Flex Fuel speak for itself in the form of data logs and dyno graphs.
Also see the “About Fuel Flex” section on our website for credentials of the Fuel Flex Founders.
Of course, we can. Whether you want a higher oxygenate content or lower oxygenate content, Flex Fuel can produce exactly what you need. If you want a high RON/MON fuel with a higher density or a fuel that reduces your EGT’s more, we can support you.
a) If there is still residual fuel left in your tank, this can have a significant impact on your oxygenate concentration. As an example, if you have just 2 L of residual pump fuel left in your tank and you top up with 20L of Opti E85R, this dilutes the oxygen concentration down to 77 %.
b) Modern ethanol sensors contain capacitive sensors. The dielectric constant or relative permittivity of the fuel passing through the sensor is measured. The relative permittivity of the fuel changes with the ethanol content. This is then measured and processed into an output signal of Ethanol content.
In addition to ethanol, Opti E85R contains components which influence its relative permittivity and this leads to a deviation observed on your ethanol sensor. This deviation will not be more than 4 %.
(Note that if you add a few ml of a high polarity molecule (water) to an E85 fuel, the ethanol sensor quickly reads 100 %).
Consequently, if you are confident that no dilution has taken place and you see a slightly lower reading on your ethanol sensor, the true oxygenate content will be close to 85 % and more importantly you will have sufficient octane for your tune. This can easily be verified by logging your tune.
Should you have true flex fuel mapping, you can advise your tuner accordingly although if you are custom tuning your vehicle with Opti E85R your tuner will be fully aware of its octane potential.