Any idea what can cause this lads !!!!! i have a D....cat full sym bigger (intercooler MTIC from a v4 sti) and a v4/5 inlet air filter cone HKS bov Z4 Ecu thats about it i think hits fuel cut now and again if im given it some BOOST

drive in 5th on the mot way sweet!!!! but if i drop it down to 4th and really push it in to 5th it hits fuel cut do i need a remap ? or can this me sorted iv gone from not a lot off boost to 2much lol runs sweet driveing around town and given a little boost now and again will boost 1.2 bar then sits a 1 bar

Also what is bar is fuel cut ?

 

you may need a HKS Fuel cut defender, has it only started now the air is colder?

 

Yes remap is the safe way to stop it happening and get it sorted, although you could use a fuel cut defender to stop it hitting the cut. Problem is there is a reason that is there and really the solution is a mappable ecu of some sorts.

Graham

 

What car is it to start with?
And any of the above can and will cause you to overboost.

Tony

 

It's a wrx 1995 import pal

 

Question ! The boost solinoid should it be clicking all the time when the engines on ?

 

I had the same issue with my V3 Sti many years ago - ended up fitting a Blitz DSBC under dash (hidden so I wouldn't be tempted to tinker) and set at max of 1.3 bar - ran like a dream after that

 

do you have a manual boost controller fitted? dawes device or similar?

 

doesnt sounds like spike, sounds like over boost full stop. z4 should only boost to 0.9bar. check the boost pipes are connected to the solenod correctly and check the restrictor is fitted in the bottom hose still.

 

z4 will boost to 1.1 ish without hitting the cut if a mcb is used, 1.2 will deffo be hitting the fuel cut, check for vac leaks as a tiny leak can raise the boost in the same way an mcb will

 

Its boosting higher due to the mods.

Get it mapped or remove some mods until you can afford to have it mapped properly.

Simon