Roosie

iTrader: (8)

in general are they higher than petrol cars?

reason is i have a 330d E46 BMW and it has a hesitation under load. ive had a diagnostic machine on it and no noticable faults on it.


ive done a live datastream on it whilst driving and i dont know if its normal but do desiels always show Absolute Pressure ie dont vacuum? when on boost its about 29-32psi ??? is this high or normal for a derv engine?

i know this would be high on a petrol std engine but i know nothing about dervs?

Cossie Sean

thats overboost, perfectly fine.
i`d check the map or boost sensor..... probebly full of sludge, quite common on them
backs off after about a second or two when accelerated hard in high gears

Cossie Sean

oh and no throttle bodie so no vacuum mate

J1mbo

iTrader: (1)

peugeot 307 2.0 hdi i checked ran 1 bar boost

jammerrs

dervs run big boost, in america they have ones running 250psi

Roosie

iTrader: (8)

yeah fairly similar to that it will hesitate a few times then just suddenly power up like vtec lol but its turned gutless lowdown.

dont know were map/boost sensor is on these.

J1mbo

iTrader: (1)

that was like the 307 i mentioned above was like,

very sluggish till just before 3k then it would get 3k and off it goes, it was maf sensor

Roosie

iTrader: (8)

ive been stuing over maf BUT it will cost me circa £350 to have a new one and software update from the stealer as they have to do it and i dont want to get it and find out its not done nothing.

J1mbo

iTrader: (1)

bloody hell, thats a bit more than this one was, want to get it right first time then !

Cossie Sean

just buy a moody one from Euro`s?
i will speak to a mate on tuesday who is a master BMW tec down here if you like?
Sean 07563 799 485

Roosie

iTrader: (8)

you still need to update software when you get it from anywere apparantly!

yeah if you could. ive put up with it for about 4 months now my mpg as got shit and just want it running right again lol

Cossie Sean

well text me or ring me on tuesday cos i will forget, will defanitly ask for you though no probs fella.

taittsierra

the 1.8tdi runs normal about 15-17psi an petrol cars ie. glanza'a boost at about 8psi,.evan

Cossie Sean

i used to remap a lot of diesels and boost pressures varied from 18psi std right upto 35psi on VAG tdi`s!!!!

martysmartie

iTrader: (1)

As said no vaccum, this is why vaccum pumps have to be driven to provide for brakes etc, I never thought they run 29PSI though!!! I presume that's standard?

I'm sure a modern TDDI Ford or the like runs around 10PSI.

Martin

Cossie Sean

no way, most modern diesels run 2-3psi on tickover lol

Roosie

iTrader: (8)

mine runs 8psi on tickover

AlexF

bost sounds right

They dont need the maf recoding...