28-10-2015, 11:06 PM
You have a HDi, the MAF measures the amount of air passing over it by measuring the amount a heated wire mesh is cooled down.. faster air flow, cooler wire, means more air is going into the engine.
it knows the surface area of the inlet hole (given area) and can then meter the amount of fuel being injected to match the air being sucked in, hence issues with bad performance if you have a faulty one (it thinks its getting more air than it is) or air leaks post MAF (it thinks its getting less air than it is)..
the rattle is pre-injection and i am betting as soon as you hit 3250rpm it completely dissapeared.. i know mine did,
with a new map the injectors are MUCH quieter, but its still there..
when i had the stage1 map they were noisy as hell and then shut up completely at 3250 as pre-injection turned off then.
As it happens, in the real world (ragging the absolute tits off of the car most places) i get 43-44 to the gallon.. if i drive it on a long run this will be nearer 50... if i drive it like an absolute saint on a long run, on a full tank of fuel i can get up to 55 (i have had that once in 15000 miles)..
people who claim that all HDis do 55+ mpg regardless are flying kites in their estimations.. if i drive mine only around town my MPG is shocking, 38-40, if i dont let it warm up in the morning before i pull off, my MPG is shocking... but as above, if its between 40 and 45mpg i would say you are on to a winner.. standard this should be nearer 50 in my estimation but thats an absolute max with a mix of driving styles and situations (stop start rush hour, around town, medium to long journeys etc)
bearing in mind this is stage3 with a bigger turbo and all that's associated it running 25psi... its running rich too
it knows the surface area of the inlet hole (given area) and can then meter the amount of fuel being injected to match the air being sucked in, hence issues with bad performance if you have a faulty one (it thinks its getting more air than it is) or air leaks post MAF (it thinks its getting less air than it is)..
the rattle is pre-injection and i am betting as soon as you hit 3250rpm it completely dissapeared.. i know mine did,
with a new map the injectors are MUCH quieter, but its still there..
when i had the stage1 map they were noisy as hell and then shut up completely at 3250 as pre-injection turned off then.
As it happens, in the real world (ragging the absolute tits off of the car most places) i get 43-44 to the gallon.. if i drive it on a long run this will be nearer 50... if i drive it like an absolute saint on a long run, on a full tank of fuel i can get up to 55 (i have had that once in 15000 miles)..
people who claim that all HDis do 55+ mpg regardless are flying kites in their estimations.. if i drive mine only around town my MPG is shocking, 38-40, if i dont let it warm up in the morning before i pull off, my MPG is shocking... but as above, if its between 40 and 45mpg i would say you are on to a winner.. standard this should be nearer 50 in my estimation but thats an absolute max with a mix of driving styles and situations (stop start rush hour, around town, medium to long journeys etc)
bearing in mind this is stage3 with a bigger turbo and all that's associated it running 25psi... its running rich too
Given the choice between Niall and the sheep. I would choose the sheep!
/Toseland
/Toseland