A small miracle

[adam quantrill]

Well, after fitting my inlet pipe I have noticed I only need to fill up every 6 days, not 5. By my calculations my MPG has gone up from 17.25 to 21.55! So I can use the load pedal much more!!!

Edited by adam quantrill on Wednesday 27th March 19:42

[Trickie Dickie]

What pipe do we have to fit to get more MPG, Adam?
(for us non techy people)

[adam quantrill]

Sorry I did try to share a piccy but it's stopped working.

Let's try again... the new pipe is the stainless one hanging off the air meter.

[beacon]

Hi Adam , Hope you are well.

How exactly does that impact on your mileage positively, What's going on there to do that? I am a different type type of engineer :@) but always keen to understand.

[pwd95]

Must have been an air leak between AFM & engine.

[beacon]

pwd95 said:

Must have been an air leak between AFM & engine.

That simple,pity, I was expecting something wizzy and scientific :@(

[adam quantrill]

Yeah I reckon so too - and I had to reduce the throttle bypass as after fixing it the idle revs rose to about 1300. The strange thing is that the first pipe had the problem from when I bought the car, and so had a replacement bodge pipe that I put on (some ex-SDi trunking) despite being careful about leaks. Also if there was a leak then shouldn't it have been running lean (less air metered) so somehow it doesn't stack up at least in my mind....

[Danny Hoffman]

A few uneducated theories/guesses:

1) Air leak on the old pipe, if the engine was running weak maybe you had to open the throttle more to compensate and this used more fuel. A weaker mixture wouldn't always use less fuel.

2) Turbulence in the new pipe, the new set-up might be generating turbulence which leads to improved fuel/air mixing and more efficient combustion

3) Less restriction in the new pipe, the new set-up allows better air flow maybe because the metal pipe is smooth