guillaumeber
Vendor
Hello,
I'm trying to setup my car for best economy, I don't care about performance.
The 2 basic settings I read about were IQ and injection timing.
I got VCDS, managed to adjust timing in the middle of the top half of the graph. All this is fine.
My problem is with the IQ. I read a lot, especially on the well reputed ''myturbodiesel'''s how-to.
I REALLY don't get it. They insist that increasing the IQ will give less fuel. Lowering IQ would increase fuel delivery. Well...I get confused because the IQ is in mg/stroke, so my perception tends to think that more milligrams/stroke means more fuel injected. I finally decided not to try to understand why and go like they say.
But,
While adjusting the IQ to a higher number (near 4.4), I saw in a measuring block on the VCDS that increasing the IQ does, in fact, RAISE the consumption in ''litres / hour'' in one of the box. So my questionning came back... how the hell more L/hour consumed results in less fuel injected...!?
Suddenly, I got hit by my old physics classes, and I got confused more than before!
To run at a steady RPM, any rotating mechanism needs a fixed amount of ''added'' energy to overcome the forces of friction sustained by the different parts.
With this in mind, the engine should need a fixed amount of fuel to keep it's steady 903 RPM idle speed. Adding fuel should result in more RPM, and vice-versa.
All this mesmerizes me, and I can't untangle that puzzle. I tried reading but the only explanations I can find are either very unclear, or on the other side, requires to be an astrophysicist, which I am not.
If anyone can manage to sort this out, I'd be moreeee than happy!
Thanks a lot!
G.b.
I'm trying to setup my car for best economy, I don't care about performance.
The 2 basic settings I read about were IQ and injection timing.
I got VCDS, managed to adjust timing in the middle of the top half of the graph. All this is fine.
My problem is with the IQ. I read a lot, especially on the well reputed ''myturbodiesel'''s how-to.
I REALLY don't get it. They insist that increasing the IQ will give less fuel. Lowering IQ would increase fuel delivery. Well...I get confused because the IQ is in mg/stroke, so my perception tends to think that more milligrams/stroke means more fuel injected. I finally decided not to try to understand why and go like they say.
But,
While adjusting the IQ to a higher number (near 4.4), I saw in a measuring block on the VCDS that increasing the IQ does, in fact, RAISE the consumption in ''litres / hour'' in one of the box. So my questionning came back... how the hell more L/hour consumed results in less fuel injected...!?
Suddenly, I got hit by my old physics classes, and I got confused more than before!
To run at a steady RPM, any rotating mechanism needs a fixed amount of ''added'' energy to overcome the forces of friction sustained by the different parts.
With this in mind, the engine should need a fixed amount of fuel to keep it's steady 903 RPM idle speed. Adding fuel should result in more RPM, and vice-versa.
All this mesmerizes me, and I can't untangle that puzzle. I tried reading but the only explanations I can find are either very unclear, or on the other side, requires to be an astrophysicist, which I am not.
If anyone can manage to sort this out, I'd be moreeee than happy!
Thanks a lot!
G.b.