i just had my car mapped and its fair to say my vf35 didnt like my wing mounted induction kit it was fine on my td 04 but now its causing to much turbo judder has any mapper come across this before the boost gauge needle flutters about like mad at about 1.3 to 1.4 bar on full boost
so im going back to standard airbox and i am gutted cos its sounds real nice has proper mounting for maf sensor i may try and narrow the pipe were it meets the cone filter from 70mm to say 40 mmweld some tin over it or something any ideas anyone thanks chris

 

at a guess, it sounds like turbo surge, but am only a noice on this, sure someone will be along soon to tell other wise

 

what induction kit and who mapped it?

 

yes da one turbo surge is what is it and who mapped it is not important

not sure which induction kit it is it has metal pipe leading into wing area behind wheel with brand new cone filter on would making the inlet pipe smaller as i mentioned help or should i resort back to std airbox

mapper has got rid of the surge as in you cant feel it but it still shows on my boost gauge it flicks around at high end of boost and to get rid of it he had to reduce the timing so it lost power was told to put airbox back on and he will tweek the map for me so think i need to do some tests with it just wondering what a few mappers on here thought

 

ok if you think it not important then cool. Been through the same thing.

and got it sorted by using someone else to map it

im using an aps cak 70mm thats why i asked.

the maf scaling for these can be very unusual.

Thats why i asked who mapped it.

 

Mine was fine for about six months and then started this...
soon to be slaughtered on the altar of higher performance...

DunxC

P.S. Don't know the cure, just have to keep mine up on the limiter LOL

 

anyone have any input on this would be greatly appriciated

 

Easiste way to fix surge is to reduce the target boost to below the surge line on the compressor map (funnily enough!), alternatively junk the intake system and go back to a standard one that has never been known to cause surge on a VF35!

Have you kept the stock under manifold to turbo pipe?

Simon

 

How is the boost controlled? via the ecu or an avcr or other boost controller?

Do not reduce anything towards the maf as i imagine this will really mess your maf scaling up and probably result in the car being worse (possibly fatally so as well)

Best bet is to run it as is at present (maybe reducing the boost if possible) until the mppaer can revist and then swap over to the standard airbox at the time mapping commences (2 min job)

 

what do you mean by the stock

 

stock anyone !

 

original

 

seems ive cleared it now reduced pipe were it meets cone filter in wing reduced it with a plate from 70mm to 50 mm and its stopped surging
the boost pressure has dropped slightly to around 1.2 or 1.3 bar is this normal going to tweek the map now as the mapper said he reduced the timing when it was surging hopefully it will be ok going to take std airbox along just in case it returns when he advances timing again

 

Sounds like bad boost control in the mapping.