boosting problem

[nick-barnes07]

hi , ive just bought a ibiza cupra , photeks old one , and adam k s old one so ive been told , when the car comes on boost it goes upto over a bar then drops to 0.5 bar within seconds , the car has got a print out for 217-219 bhp , but it feels more like 160-180bhp , any one had this problem

 

[acidstrato]

what remap is it?

most probably a boost leak somewhere but could be a few things, depends if the map requests it

 

[nick-barnes07]

jabba sport map ,

 

[acidstrato]

that should be boosting much higher then, leak in the piping is the most likely cause and easiest thing to diagnose without the use of vagcom.

if you have access to vagcom however you can log actual vs requested boost pressure and this will clear a few things up

theres no specific cause for loss of boost, so looking for a leak is the easiest thing to start with.

 

[nick-barnes07]

bill plugged vag com into it the other day and only found 1 fault , which was maf , but that is now fixed

 

[truCido]

have you got the standard dv on there?

 

[acidstrato]

ok but scanning for fault codes only helps if theres fault codes to be read..... and unfortunately not every issue will flag up a fault code. thats why logging is a very helpful tool. logging boost allows you to see what the map is requesting and what the car is actually producing.

logging maf airflow for example would confirm whether the maf is still fecked or not. although unplugging it is another method

still a leak from a split or disconnected hose is very possible or a leaky dv for example

 

[nick-barnes07]

have you got the standard dv on there?

no i got a forge tip , and a 007 re circ

 

[nick-barnes07]

not a leaky dump valve , i will have to ask bill if he can log it to check for leaks, and to check what boost it asking for , cheers

 

[acidstrato]

if you dont have immediate access to vagcom, checking for leaks can be as simple as listening to the engine while its running and locating any hissing on idle or whooshing on throttle. any vac hoses on top of the engine could be causing one.

but like i said it could be something else...try unplugging the maf and seeing if its any different.

 

[nick-barnes07]

ill try swapping a few bits over from my leon , checking bits like n75 and that

 

[nick-barnes07]

unplugged the maf and it is still exactly the same , if anything it boosts a bit more