Found some comments:

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Should have bought an STI

Huh?

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Bye bye betty blue. Hello F6.

And the good thing about this. It will be free to use

This:

GM has developed a Virtual Flex Fuel Sensor (V-FFS) software program that calculates the ethanol content in the fuel, instead of using a sensor to measure it. When the fuel level in the tank increases as the vehicle is refueled, the computer recalculates the percentage of ethanol in the fuel and automatically changes the air/fuel ratio. To do this, the computer temporarily stops the operation of other emission systems and monitors the oxygen sensors to determine ethanol content. The test is done several times until calculations remain stable. This can take several minutes when the engine is idling, but much less time at higher fuel flow rates."
Quote:
In 2006 GM changed the way ethanol percentage of fuel was calculated by their trucks. This new system was deemed Virtual Flex Fuel System. Instead of using an additional sensor in order to measure ethanol content, the ECM had a software upgrade which allowed it to make this measurement by utilizing the fuel tank pressure sensor and level sensor signals. At a key on event the ECM looks to see if the fuel tank level sensor signals atleast a 2 gallon change from the last key off. If so, the ECM shuts the tank vent solenoid, monitors the fuel level and fuel tank pressure. These readings are applied to a formula which gives an ethanol percentage. The commanded air/fuel ratio is then changed according to ethanol percentage of the fuel.



^^ That obviously didn't work out too well in 2006!........ GM Brands use the Continental Ethanol sensor & it's mounted on the return line at the tank itself on current 2014/15 vehicles.



This part number suits 90% of the Current Chevrolet, GMC & Cadillac in the USA & the Holden Cruze and Commodores here in Aus, it was introduced in 2011.

Anyone who's dabbled with E85 tuning knows that you tune for the same AFR's as you do on 98 - the difference is that you need to add around 30% more fuel to achieve the same AFR's on E85 as you do on 98.

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

A little more info on the no-ethanol sensor E85 systems that were tried early on:

They used a wide-band oxygen sensors (Bosch LSU 4.0) & a broad O2 based fuel trimming map to adjust for differing fuel ethanol content (increasing fuel to bring the AFR's back to pre-set targets).

This system was a bandaid solution & did not vary the ignition mapping like current Flex vehicles do - so the gains were minimal, but E85 was cheap back then in the US of A.

This type of system was never used in nor intended for boosted applications.

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

Gm is the sensor my flex setup uses

using the Perth-WRX mobile app

The latest virtual flex is meant to be run on any full house 207/257.

Will have to wait and see how it goes but it is currently installed on test vehicles.

Can not wait to fit one to the S204 powered Liberty kramer
Should make the mum mobile motor along

Not a bad idea. She already thinks it has some get up and go. This would add a wall of torque too.

Any updates Gordon? RJ?

Is the blown motor out?
Is the new motor fitted out with forged pistons?
Is it ready for dyno tune?