Cosworth AFR gauge readings all over the place basically if you gradually build up the revs it drives and pulls fine but if you try and give it the beans instantly it will splutter and AFR readings leans out and the goes rich. it also fouls the plugs very thick dry black soot. i have replaced a load of things on it sensors etc it will just not sort itself out. any help would be massivley appreciated! Thanks.

 

have you checked for leaks?

 

hi mate, as in boost leaks?

 

I would be looking for boost leaks and inlet leaks based on the above poster.

 

there is no boost leaks and sprayed for vacuum/air leaks cant find anything

 

the car has had NEW
CTS
PHASE
CPS
ROTOR ARM
MAP SENSOR
SPARK PLUGS
FUEL TANK & BOSCH 044 REWIRED.
FUEL LINES
HEAD GASKET
however ive just done a compression test and its reading approx 125 psi that seem low?