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Originally Posted by LotusBMW
Quote:
Originally Posted by froop
If you're running map 5 on the JB4 it should self tune for the small ethanol percentage and extra octane in the fuel.
You are probably safe trying an E30-40 mix with a stock fuel system on map 5. Just remember that this does not mean 30-40% E85 and the rest pump fuel and especially doesn't mean the rest United 100. You need to get a calculator so you can correctly mix the right amount of E85 and other fuel to get 30-40% of ethanol.
Also make sure you datalog so you know your fuel system is handling it.
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Been considering all of this over brekkie this morning. Do I take it from the above it's not a matter of mixing XX% by volume of E85 versus 98? You're aiming for (say) 30% ethanol, not 30% E85?
Owner's manual says it's a 63 litre tank with 8 in reserve (presume this means you actually have 8 litres left when trip computer says empty). So let's say you fill up with 60 litres of fuel as an example. If you're aiming for 30% ethanol, that's 18 litres out of 60. Given that E85 is (fairly obviously) 85% ethanol, you need to add 21 litres to get the 18 litres of ethanol (that's 18 / 0.85). That how it should be approached?
Is 30% conservative enough due to the different calorific and therefore flow rates? Stock fuel system but running JB4 map5, CLDPs.
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Correct. E30 means 30% ethanol and not 30% E85. Though, if you're using map 5 on the JB4 it won't make a huge difference what percentage you have since it self tunes. Provided your fuel system is handling it ok.
Generally E30 should be fine on a stock fuel system without any backend flash. Any higher and you'll want to datalog to make sure your fuel trims are in check. It's possible to go up to maybe E60-E70 on a stock fuel system provided you have a backend flash to adjust the fuel scalars. With the right fuel scalar and an upgraded LPFP, people have been knows to run straight E85 on stock turbos.