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Ethanol & Flex Fuel Tuning: Introduction

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00:00 - In this worked example we're going to be looking at performing a full flex fuel tune on this VW Corrado race car using a Link G4 Plus ECU.
00:09 We're going to be using Link's modelled multi fuel equation here to perform the flex fuel tuning.
00:16 Now while we are performing a full flex fuel tune, we are actually expecting this car is going to run predominantly either on E85 or on pump gas.
00:27 Probably nowhere in between so full flex fuel capability isn't strictly necessary.
00:34 However the reason we have opted to do a full flex fuel tune is that the car's already fitted with a fuel composition sensor, and doing a full flex fuel tune is going to mean that if the ethanol content does vary slightly then the ECU's going to be able to account for this, ensuring that the tune is still accurate and most importantly safe.
00:55 This is particularly important when a car goes from E85 for example back to pump fuel.
01:01 It's quite likely that there will be some residual ethanol in the tank and the final ethanol content may be somewhere in the region of E5 to perhaps E10.
01:11 This can have a reasonably significant effect on the required fuelling.
01:16 A little bit of background on the car itself, it's fitted with a 1.8 litre engine from a 2002 Audi TT.
01:25 It's been fitted with a two litre crankshaft, and slightly overboard so the final capacity is right at two litres.
01:32 It's also fitted with a Garrett GTX3071R turbo charger, and a set of expert 1600cc injectors.