E10 and older engine management

[100SRV]

From the News sub-forum where there is a thread about E10 petrol...

jsf said:

You need to inject 4% more fuel for E10 compared to plain petrol to achieve the same lambda, it's lambda that the engine management system targets.
So on a modern engine which targets lambda 1, you will use 4% more fuel using E10 over plain petrol, 2% more compared to E5.
You can run a higher ignition target under load with more alcohol so can pick up some torque, but that doesn't change the fuel economy impact on cruise and if wanting to take advantage of the extra torque potential you will inject even more fuel than previously.

I refuelled my Bowler with E10 in France a few years back, it ran really badly. It's got 14CUX EFi in open loop configuration with distributor (lumention) ignition.

I'll guess that there is no avoiding E10 so what is the best way to adapt the engine management to run better on E10?
- fit Lambda sensors and run it closed-loop?
- get a fuelling map specific to E10 and adjust the ignition accordingly
- something else
I'm just fitting a new 3.9 engine so changing to a later type with knock sensors is not financially viable.

[stevieturbo]

100SRV said:

I refuelled my Bowler with E10 in France a few years back, it ran really badly. It's got 14CUX EFi in open loop configuration with distributor (lumention) ignition.

I'll guess that there is no avoiding E10 so what is the best way to adapt the engine management to run better on E10?
- fit Lambda sensors and run it closed-loop?
- get a fuelling map specific to E10 and adjust the ignition accordingly
- something else
I'm just fitting a new 3.9 engine so changing to a later type with knock sensors is not financially viable.

Screw E10...we need E85.

Simplest method to add fuel....add fuel pressure.

[anonymous-user]

IME, the average aftermarket ECU is way more than 4% out in terms of base cal already, and most just leave the closed loop fuelling to mop up the errors, which is will do automatically. I also bet that most peoples LBT/BLD ignition map is a good few percent away from optimium as well.........

[100SRV]

Max_Torque said:

IME, the average aftermarket ECU is way more than 4% out in terms of base cal already, and most just leave the closed loop fuelling to mop up the errors, which is will do automatically. I also bet that most peoples LBT/BLD ignition map is a good few percent away from optimium as well.........

Good points!