Back pressure control valve - waste gate?
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Nope. Our trucks have both a wastegate on the turbo, and an exhaust backpressure valve that sits between the turbo and exhaust downpipe.
The wastegate releases excessive exhaust at higher boost levels. The actuator is what sits on top of the turbo and has a red tube connected to it.
The exhaust backpressure is designed to aid the engine warmup in cold weather. The valve will close under low rpm low load conditions. The actuator for the exhaust backpressure valve is located underneath the turbo inside the turbo pedistal. You can barely see the rod sticking out underneath the passenger's side of the turbo.
The wastegate releases excessive exhaust at higher boost levels. The actuator is what sits on top of the turbo and has a red tube connected to it.
The exhaust backpressure is designed to aid the engine warmup in cold weather. The valve will close under low rpm low load conditions. The actuator for the exhaust backpressure valve is located underneath the turbo inside the turbo pedistal. You can barely see the rod sticking out underneath the passenger's side of the turbo.
Thread Starter
|
Mountain Pass
Joined: Feb 2005
Posts: 127
Likes: 0
From: APPLE VALLEY
That was my understanding. We just had a home show in town. Included was a diesel modification dealer; 20 years banks dealer, hot rod diesel puckup, yada, yada. I asked him about the back pressure control valve. He said there was no such thing. That that was really the waste gate. He was a real blow hard.
My ultimate question was/is, why increase exhaust system capacity if the engine control system is just going to create back pressure anyway. Unless maybe it is only active during warm up. Is it always wide open after that?
My ultimate question was/is, why increase exhaust system capacity if the engine control system is just going to create back pressure anyway. Unless maybe it is only active during warm up. Is it always wide open after that?
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
My ultimate question was/is, why increase exhaust system capacity if the engine control system is just going to create back pressure anyway. Unless maybe it is only active during warm up. Is it always wide open after that?
Realistically you don't want any additional backpressure after the turbo. Some people elect to remove the exhaust backpressure valve based in part on that reasoning. I removed mine, but didn't see any real increase in performance. My EBPV was malfunctioning due to a clogged sensor, so it was staying closed and never opening until the engine warmed up. That was annoying, and I got tired of cleaning the sensor tube.
We just had a home show in town. Included was a diesel modification dealer; 20 years banks dealer, hot rod diesel puckup, yada, yada. I asked him about the back pressure control valve. He said there was no such thing. That that was really the waste gate. He was a real blow hard.
Thread
Thread Starter
Forum
Replies
Last Post
scottie2hottie
Supercharger, Turbocharger, Nitrous Oxide & Water/Methanol Injection
18
Feb 9, 2012 09:13 AM
