Hi

I've a t3 turbo from a RWD sapphire cosworth TB0361 installed into my sierra 2.0 8v DOHC.

It has installed a rebuild kit with 360 axial.

Now what I want to know is the max pressure that I can get from it at high rpm (6500)

Because in middle RPM (around 4500), I can get 1,2 bar without any problem. But in high revs I'd like to have around 1,4 bar and I can't get it, no more than 1 bar over 5500 rpm. Is that the max boost I can get?

I've an electrovalve to control the air that goes to the wastegate controlled by the megasquirt, over 5500 I tryed to set it to the max value, equivalent to've the wastegate disconnected. I will try with the waste disconnected physically

 

My t3 was set for 1.7 bar mid range but backing off to 1 bar at the limiter, that's due to injectors, but I doubt a t3 will provide much more at the top end without over speeding, a 4wd t3 is slightly better.

 

Ok thanks, in my case I've 440cc injectors, so I think it could give me fuel a bit over 1 bar at 6500 rpm.

I've read that the T3 from RWD is 55 trim, and the 4x4 60. I don't know if it is noticeable the difference between them. I could consider change the turbo to a 4x4 one, or to another that could be a direct fit. Maybe a t3/t4 hybrid?

 

I've stuck 2 bar through a 4x4 T3 before ad was ok.