Why does my turbo do this
Thread Starter
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Senior User
Joined: Mar 2010
Posts: 330
Likes: 0
From: Harrisburg NC
Why does my turbo do this
When im driving my truck if i get on about 2800 rpms an i hold it like if getting on the interstate when the truck shifts from 3rd to 4th (auto) itll do the wastegate an stuff but then a second later ill her the kush kush kush noise i think its turbo surge. Why does it do this? It doesnt all the time. Is it bad for the turbo?
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Yes turbo surge is bad for your turbo. Not too many people are able to get that much out of the Edge, so congrats. Many have to upgrade to a real chip before they see surge.
The 2 popular fixes for surge are either install a wicked wheel, or swap to a ported shroud compressor housing to change the boost curve. The wicked wheel is cheaper, the housing is less labor intensive.
Have you monitored your boost pressure while this noise happens, or is your data sampling rate set where you don't really see it?
The 2 popular fixes for surge are either install a wicked wheel, or swap to a ported shroud compressor housing to change the boost curve. The wicked wheel is cheaper, the housing is less labor intensive.
Have you monitored your boost pressure while this noise happens, or is your data sampling rate set where you don't really see it?
Thread Starter
|
Senior User
Joined: Mar 2010
Posts: 330
Likes: 0
From: Harrisburg NC
Yall will probably cuss me for this but i do not have gauges yet..the guy i got the truck from did not have them an has had the chip for a while
. Thats the next big mod for the truck.
Oh an the tuner is on economy mode too.
. Thats the next big mod for the truck. Oh an the tuner is on economy mode too.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
The edge is generally supposed to be safe without gauges, but I'd keep it below 2,500 rpm's until you get them installed to be on the safe side. Stick some gauges in and watch what the numbers do, then upgrade to a real chip and not only feel the difference in the SOTP meter, but watch the difference in the gauges.
Fleet Mechanic
Joined: Jun 2009
Posts: 1,866
Likes: 8
From: Fleetwood, PA
Yes turbo surge is bad for your turbo. Not too many people are able to get that much out of the Edge, so congrats. Many have to upgrade to a real chip before they see surge.
The 2 popular fixes for surge are either install a wicked wheel, or swap to a ported shroud compressor housing to change the boost curve. The wicked wheel is cheaper, the housing is less labor intensive.
Have you monitored your boost pressure while this noise happens, or is your data sampling rate set where you don't really see it?
The 2 popular fixes for surge are either install a wicked wheel, or swap to a ported shroud compressor housing to change the boost curve. The wicked wheel is cheaper, the housing is less labor intensive.
Have you monitored your boost pressure while this noise happens, or is your data sampling rate set where you don't really see it?
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Senior User
Joined: Jun 2008
Posts: 272
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Is it bad that if its cold around 40* or lower when i idle or even drive it will do the wushhhhhhhhhhhhhhh real loud and long like a harrier jet getting ready to take off?
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
That jet sound is caused by the EBPV (exhaust back pressure valve) closing. Perfectly normal on a cold morning. It should release when you step on the skinny pedal. If you are just sitting at idle it will close again in less then a minute and release when you hit the pedal again. When the engine warms up it will stay open. The valve closes to help warm up the engine faster by increasing the exhaust back pressure and increasing the load on the engine.
Here's some info about the EBPV operation:
"The most common complaint from customers is that they are hearing some sort of an air leak on start up and the vehicle lacks power momentarily especially in cold weather. What they are most likely hearing is the Exhaust Backpressure Valve.
The purpose of the back pressure valve is to increase cab heat and shorten the amount of time it takes to defrost the windshield,
it also is used to help reduce exhaust emissions.
The back pressure valve is located on the turbo, exhaust side connected to the turbo exhaust pipe. Here’s how the system works.
The movement of the back pressure valve is controlled by the exhaust backpressure regulator (makes sense!) which is mounted in the turbo pedestal. The PCM(computer) uses measured exhaust back pressure, intake air temperature, engine oil tempter and engine load to determine back pressure regulator operation.
During each initial engine start up, the PCM exercises the back pressure valve to cycle on and off once. If during start up the temperature
of the intake air is below 37 degrees Fahrenheit and the oil temperature is between 32degrees and 140 degrees the PCM will continue to
keep the back pressure valve partially closed. As the engine oil temperature rises during operation the PCM will control the back pressure
valve in response to the rising oil temperature. What this means to you is that on cool to cold mornings you will hear a hissing sound and
lack power on the way to the coffee shop. Also, if you put the pedal to the floor, the valve will open and the truck takes off."
Here's some info about the EBPV operation:
"The most common complaint from customers is that they are hearing some sort of an air leak on start up and the vehicle lacks power momentarily especially in cold weather. What they are most likely hearing is the Exhaust Backpressure Valve.
The purpose of the back pressure valve is to increase cab heat and shorten the amount of time it takes to defrost the windshield,
it also is used to help reduce exhaust emissions.
The back pressure valve is located on the turbo, exhaust side connected to the turbo exhaust pipe. Here’s how the system works.
The movement of the back pressure valve is controlled by the exhaust backpressure regulator (makes sense!) which is mounted in the turbo pedestal. The PCM(computer) uses measured exhaust back pressure, intake air temperature, engine oil tempter and engine load to determine back pressure regulator operation.
During each initial engine start up, the PCM exercises the back pressure valve to cycle on and off once. If during start up the temperature
of the intake air is below 37 degrees Fahrenheit and the oil temperature is between 32degrees and 140 degrees the PCM will continue to
keep the back pressure valve partially closed. As the engine oil temperature rises during operation the PCM will control the back pressure
valve in response to the rising oil temperature. What this means to you is that on cool to cold mornings you will hear a hissing sound and
lack power on the way to the coffee shop. Also, if you put the pedal to the floor, the valve will open and the truck takes off."
Molon Labe
Joined: Dec 2006
Posts: 5,272
Likes: 1
From: Alaska
EDIT: Robin beat me to it...
Postmaster
Joined: Dec 2008
Posts: 3,340
Likes: 2
You might want to start a new thread so you don't 
. Are you guys typing on your phones? 
Elder User
Joined: Sep 2009
Posts: 628
Likes: 0
From: Parker, Colorado
Mine makes a wooshing sound, thought i was my boots. They needed to be replaced. Replaced the boots, some of it stopped. Get up to about 2800 rpm and it does it again. Found out by Curtis, Lisa, and Bill that I have a leaking up-pipe. When my boots were bad drivin down the hiway at 75 or so it would make a rapid tissh tisssh tisssh sound.