Hello, I have a s2 1989 rs turbo my first nightmare is:

1, The turbo is boosting fine up to 10psi but will lose power after about 5-10mins when the nigne is hot.

2, At high speeds the cars feels very unsafe, the steering wheels juddering and also under braking and the car feels as though its floating

Thanks for your time

Mark

 

2nd question,wheel bearings,tyres,wheel nuts,bushes,tracking,suspension,
check them all,the juddering could be the discs warped,which happens after five minutes of putting on new standard ones,

also check your tyre pressures ,this is important,and often overlooked.

 

get your wheels checked to see if they are balanced correctly so only cost a few quid and makes a huge difference

 

Yep as above.

RE: turbo, check the actuator is not scrap. could be why you've got a boost problem, assuming the car is chipped?