Hello everyone! My ST205 got some engine problems, the turbo starts working hard only over 4000 rpm and it doesn't work like he did until one year ago. I only have changed the air filter and the exhaust, but this job has been done about two years ago, so this can't be the cause of the problem.
I find a dyno to test the car, but I think that if I could find the result of a dyno test made with an original ST205 I could find even more precisely where is the problem. I find nothing on the web, because I find only some dyno results of celica with over 300hp.....and it's not my case (not for now...)
Anyone of you got some stuff that could help me?

Hello,

I would suggest you check your spark plugs, HT Leads and distributor cap as it sounds to me like there could be a problem with one of those or maybe a fuel filter, does it spool up easily at 4000rpm or not?

HTH

Nathan