hi lookin for help n my saph cossie. recently the turbo has become real laggy it eventually reaches peak boost but the boost is building up really slowly and peak boost wont come in til around 5k rpm. im aware the turbo may require some attention as there is slight play in shaft. but just wanted to see if there were any known problems as the car has been perfect since ive had it. the car is running a stage 1 tune any help is apreciated thanks

 

No leaks between turbo and inlet manifold?

 

doesnt seem to be theres new intake hoses and the intercooler looks like it has been refurbished recently. you think there could be a chance tht theres a crack in the turbo or that there could be a leak between the inlet and exhaust side of the turbo?

 

It's a possibility and something you can check yourself.
Do you have a blow-off (pop-off) valve? Is that one in working order or leaking?

Can you measure map-sensor signal when running idle with warm engine?
Or measure inlet manifold pressure?

 

Let the engine run and spray engine starter gas(or what you call it) on all the hoses and inlet, if the engine revs it self, you've got a leak.

My last cossie started boosting really slow, reached 1bar at 5500rpm or something silly like that, and I found this when I dismanteled the turbo:

 

Is your wastgate shutting correctly ?

Steve

 

yeah exactly what mine is doing not reaching peak boot till like 5000rpm. ill try spraying someting on it tomorrow see if theres a leak. if my turbo is the same as the one in th video can it be repaired? thaks fo the reply

 

wastegate seems free enough and also has a new actuator with correct adjustment

 

dump valve is only a few months old and still seems to be working ok. ill check all that tomorrow thanks

 

Wouldn't know, since mine still stands in the corner looking sorry for it self :P

 

haha no problem thanks for the feedback