turbo questions?
Thread Starter
|
Senior User
Joined: Jun 2006
Posts: 139
Likes: 0
From: Tonganoxie, Ks.
turbo questions?
I have a 1990 7.3 with a turbo engineering kit on it wich has a rayjay turbo with no wastegate on it. My question is what is the difference between a turbo with a wategate and one without? What are the pos and cons of either and how much horsepower can a setup like this make? I am not a turbo guy or even a diesel guy although I did own a 1982 chevy with a 6.2 diesel a long time ago. Boy the was a dog and a half! I hope this ford will run well when I get it going though you guys may get tired of all my questions by the time its done. Thanks for your thoughts.
Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
Likes: 3
From: Ladner, British Columbia
The factory turbos like my 93 with the Garrett turbo had waste gates to prevent over-boosting.
The design maximum boost pressure on the 93/94 factory turbo's was a very conservative 7.0 psig at which the waste gate would open and not let the boost pressure climb any higher.
I disconnected my wastegate and have pushed things to 10 psig with my existing Garrett turbo. I am sure the turbo would put out more if I turned up the fuel; however my exhaust temperature are already pretty close to the maximum (1,100 deg F)
If I wanted to go beyond 10 psig boost without risking melting or seizing up pistons I would have to make two key modifications to my truck:
1, Increase the exhaust piping fromt the current 2 1/4" to say a 3" or possible 4" to reduce turbo backpressure
2, Add an intercooler
Once I have made it over these two hurdles I could then turn the fuel up and let her rip. Maybe some day. For now what I have does the job just fine.
If you don't have a wastegate to control turbo boost make sure you get yourself a boost gauge and a pyrometer so you can monitor and take your foot of the pedal when things get to hot.
Seb...
The design maximum boost pressure on the 93/94 factory turbo's was a very conservative 7.0 psig at which the waste gate would open and not let the boost pressure climb any higher.
I disconnected my wastegate and have pushed things to 10 psig with my existing Garrett turbo. I am sure the turbo would put out more if I turned up the fuel; however my exhaust temperature are already pretty close to the maximum (1,100 deg F)
If I wanted to go beyond 10 psig boost without risking melting or seizing up pistons I would have to make two key modifications to my truck:
1, Increase the exhaust piping fromt the current 2 1/4" to say a 3" or possible 4" to reduce turbo backpressure
2, Add an intercooler
Once I have made it over these two hurdles I could then turn the fuel up and let her rip. Maybe some day. For now what I have does the job just fine.
If you don't have a wastegate to control turbo boost make sure you get yourself a boost gauge and a pyrometer so you can monitor and take your foot of the pedal when things get to hot.
Seb...
