Hi everyone:
Let me give you a clue about the problem. I was very happy running 17 psi in my 1993 GTS25t, then the turbo died, it exploded and I had to take the turbine pieces of the intercooler and the piping before it, after it I didn't find anything bigger than shinning dots of aluminum, I cleaned anyway the intake manifold and all the piping. Fortunately I found a very similar garret turbo and made it re-bore to make it easier to get 17 psi. I drove the car for about 3 days with 7-10 psi, it was perfect and the turbo had much better response than the blown one. When I tried to raise the boost the car immediately started to cough and splutter and it wouldn't go further than 4500 rpm. I posted previously the problem and got some answers to try out. So far i have tried the following:
1) Checked the coils OK
2) Checked the O2 sensor and gave me in idle 0.4V and 2500 rpm between 0.4 and 0.8V, some times drops to 0.2(the manual says that between 0.6 and 1V. is OK so is that the problem? Higher voltage
3) Checked the compression of the pistons and they are even and OK.
4) checked the plugs (they had kind a brick color) but no signs of damage, and cleaned them out.
5) Checked the AFM, the hot wire seems pretty healthy, the voltage in idle is 0.8 constant and when in 2500 rpm is 1.4 approximately, when accelerating more (no load.. in neutral) got readings of 3.8 V. so seems to be OK?. Well with no load maybe is not sucking that much air as when running it, so still with a question mark on it.
6) Checked the fuel pump pressure, I blocked for an instant the return rail and the pressure got up to 120 psi. When not blocked 40 psi (accelerating). Since I don't know the original values, maybe the regulator is not good?
Finally it makes me think a lot about the turbo, why the problem would start right after installing the new one? is it a coincidence or is it the turbo that has something when boosting that makes the car splutter like that?. Maybe the actuator has problems to move the wastegate and makes it close and opne slowly so it would cause the problem?
I need help guys!!! THANKS IN ADVANCED.
Let me give you a clue about the problem. I was very happy running 17 psi in my 1993 GTS25t, then the turbo died, it exploded and I had to take the turbine pieces of the intercooler and the piping before it, after it I didn't find anything bigger than shinning dots of aluminum, I cleaned anyway the intake manifold and all the piping. Fortunately I found a very similar garret turbo and made it re-bore to make it easier to get 17 psi. I drove the car for about 3 days with 7-10 psi, it was perfect and the turbo had much better response than the blown one. When I tried to raise the boost the car immediately started to cough and splutter and it wouldn't go further than 4500 rpm. I posted previously the problem and got some answers to try out. So far i have tried the following:
1) Checked the coils OK
2) Checked the O2 sensor and gave me in idle 0.4V and 2500 rpm between 0.4 and 0.8V, some times drops to 0.2(the manual says that between 0.6 and 1V. is OK so is that the problem? Higher voltage
3) Checked the compression of the pistons and they are even and OK.
4) checked the plugs (they had kind a brick color) but no signs of damage, and cleaned them out.
5) Checked the AFM, the hot wire seems pretty healthy, the voltage in idle is 0.8 constant and when in 2500 rpm is 1.4 approximately, when accelerating more (no load.. in neutral) got readings of 3.8 V. so seems to be OK?. Well with no load maybe is not sucking that much air as when running it, so still with a question mark on it.
6) Checked the fuel pump pressure, I blocked for an instant the return rail and the pressure got up to 120 psi. When not blocked 40 psi (accelerating). Since I don't know the original values, maybe the regulator is not good?
Finally it makes me think a lot about the turbo, why the problem would start right after installing the new one? is it a coincidence or is it the turbo that has something when boosting that makes the car splutter like that?. Maybe the actuator has problems to move the wastegate and makes it close and opne slowly so it would cause the problem?
I need help guys!!! THANKS IN ADVANCED.