How much PSI is too much
How much PSI is too much
I've run 18psi for around a minute at a time without issues.
Some others have run up to 26psi on the stock injection pump and turbo. They didn't understand that "more isn't better", they're overspeeding their turbo and actually reducing performance with the excessive boost.
I don't think anyone really knows for certain.... But you will definitely run out of fuel before you need to worry about it.
I drove my `83 123.193 with the actuator hose disconnected, then I had 20 PSI, and the car had the same power as on 9 PSI, when I adjusted the pump I got 25 PSI, but the car lost much power, attached the actuator hose again, drove it on 9 PSI and I had much more power than before.
I drove it on 20 PSI for a long while, no harm done, boost dont hurt a diesel engine, but fuel can hurt it.
(06-26-2010, 04:08 AM)Einar I drove my `83 123.193 with the actuator hose disconnected, then I had 20 PSI, and the car had the same power as on 9 PSI, when I adjusted the pump I got 25 PSI, but the car lost much power, attached the actuator hose again, drove it on 9 PSI and I had much more power than before.Did you plug the hole? I have plenty more HP.
I drove it on 20 PSI for a long while, no harm done, boost dont hurt a diesel engine, but fuel can hurt it.
(06-26-2010, 04:08 AM)Einar I drove my `83 123.193 with the actuator hose disconnected, then I had 20 PSI, and the car had the same power as on 9 PSI, when I adjusted the pump I got 25 PSI, but the car lost much power, attached the actuator hose again, drove it on 9 PSI and I had much more power than before.Did you plug the hole? I have plenty more HP.
I drove it on 20 PSI for a long while, no harm done, boost dont hurt a diesel engine, but fuel can hurt it.
More boost doesn't go anything good if you don't have extra fuel to burn with it.
OM617A conrod brake limit around 38-40psi (OM617 takes less punishment).
There's allready several om617a superturbos that have made same discovery here in Finland
So to be on safe side 28psi would be the max.
(06-26-2010, 07:29 PM)JTY OM617A conrod brake limit around 38-40psi (OM617 takes less punishment).Can you share some more info about these con rod failures?
There's allready several om617a superturbos that have made same discovery here in Finland
So to be on safe side 28psi would be the max.
(06-26-2010, 07:29 PM)JTY OM617A conrod brake limit around 38-40psi (OM617 takes less punishment).Can you share some more info about these con rod failures?
There's allready several om617a superturbos that have made same discovery here in Finland
So to be on safe side 28psi would be the max.
(06-27-2010, 09:34 AM)MJF 28psi with small turbo is VERY different thing than 28psi with big turbo. Small turbo breaks things.
(06-27-2010, 09:34 AM)MJF 28psi with small turbo is VERY different thing than 28psi with big turbo. Small turbo breaks things.
(06-26-2010, 07:29 PM)JTY OM617A conrod brake limit around 38-40psi (OM617 takes less punishment).
(06-27-2010, 10:53 PM)ForcedInduction So "Small turbo breaks things" is very generalized and not accurate to many applications. In other words, replacing the stock T3-45 with an HX40 and running it at the stock 9psi would produce less power.
(06-27-2010, 10:53 PM)ForcedInduction Choosing a turbo is far more involved than "I want a bigass turbo", it must be matched properly to the engine's airflow and pressure needs.
(06-26-2010, 07:29 PM)JTY OM617A conrod brake limit around 38-40psi (OM617 takes less punishment).
(06-27-2010, 10:53 PM)ForcedInduction So "Small turbo breaks things" is very generalized and not accurate to many applications. In other words, replacing the stock T3-45 with an HX40 and running it at the stock 9psi would produce less power.
(06-27-2010, 10:53 PM)ForcedInduction Choosing a turbo is far more involved than "I want a bigass turbo", it must be matched properly to the engine's airflow and pressure needs.
(06-27-2010, 10:53 PM)ForcedInduction A small well matched turbo may be running in the middle of its map at 75% efficiency, but replacing it with a big turbo running close to the surge line and 60% efficiency will produce hotter air and less CFM. So "Small turbo breaks things" is very generalized and not accurate to many applications. In other words, replacing the stock T3-45 with an HX40 and running it at the stock 9psi would produce less power (not taking into consideration the extremely poor spoolup response of using a larger turbo).
Choosing a turbo is far more involved than "I want a bigass turbo", it must be matched properly to the engine's airflow and pressure needs.
(06-27-2010, 10:53 PM)ForcedInduction A small well matched turbo may be running in the middle of its map at 75% efficiency, but replacing it with a big turbo running close to the surge line and 60% efficiency will produce hotter air and less CFM. So "Small turbo breaks things" is very generalized and not accurate to many applications. In other words, replacing the stock T3-45 with an HX40 and running it at the stock 9psi would produce less power (not taking into consideration the extremely poor spoolup response of using a larger turbo).
Choosing a turbo is far more involved than "I want a bigass turbo", it must be matched properly to the engine's airflow and pressure needs.
"Small turbo breaks things" isn't very accurate, its more like "high exhaust pressure breaks things".
(06-29-2010, 02:22 PM)ForcedInduction "Small turbo breaks things" isn't very accurate, its more like "high exhaust pressure breaks things".
(06-29-2010, 02:22 PM)ForcedInduction "Small turbo breaks things" isn't very accurate, its more like "high exhaust pressure breaks things".
Right, but many people don't take EMP into consideration and thats why I mentioned it.