MAP EF2 boost creep troubleshooting
Former Sponsor
Joined: May 2012
Posts: 251
Likes: 0
From: Cottage Grove, MN
The actuator originally was deemed 23PSI. We swapped that with the 18PSI Turbosmart which lessend the issue. The car was run with no(direct routing...no solenoid) boost controller and the WGDC(only one table is used with a 3 port) was set to zero. Both tests yield the same results. The car starts at 18PSI and creeps to 26+ towards redline. This phenomenon is present with or without the Cobb controlling boost.
There is minimal pre-load on the arm...as designed to stop the flapper from moving in non boosted situations. The Downpipe was on the shop car initially, and had no issues with back pressure, so that is not the cause(it is also massive at the opening and then filters into a 3").
We are working with Sean. We want to see this issues resolved for him as quickly and painlessly as possible. Hopefully, we can figure this out ASAP.
John
There is minimal pre-load on the arm...as designed to stop the flapper from moving in non boosted situations. The Downpipe was on the shop car initially, and had no issues with back pressure, so that is not the cause(it is also massive at the opening and then filters into a 3").
We are working with Sean. We want to see this issues resolved for him as quickly and painlessly as possible. Hopefully, we can figure this out ASAP.
John
The Turbosmart actuator should of came with a separate spring, put it in there.
Thank you for chiming in and shedding some light, I'm sure we will all be able to get this figured out without too much of a hassle.
Anyone with the EF2 on an IX or VIII are seeing the same prb?? I believe my tuner did mention about seeing some boost creep with my EF2 as well, but he couldn't finish the tune becoz my clutch started letting go...hmmm...I haven been limbing my Evo ever since i put the turbo and other mods on back in March...
Evolving Member
Joined: Oct 2010
Posts: 174
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From: chicago
Minimal pre-load is exactly what though? I'm just curious how the pre-load looks in relation to the hole of the actuator arm.
The Turbosmart actuator should of came with a separate spring, put it in there.
Thank you for chiming in and shedding some light, I'm sure we will all be able to get this figured out without too much of a hassle.
The Turbosmart actuator should of came with a separate spring, put it in there.
Thank you for chiming in and shedding some light, I'm sure we will all be able to get this figured out without too much of a hassle.
Former Sponsor
Joined: May 2012
Posts: 251
Likes: 0
From: Cottage Grove, MN
Eliminating all possible angles. If the spring isn't strong enough to keep it closed all the way before hitting its target pressure, it could open up prematurely and fill the downpipe with pressure, then when it opens all the way there is already a ton of pressure built up and is causing back pressure.
Think of a clogged drain (Choked up downpipe), if you pour water into the drain slowly it will not back up and overflow. However if you pour slowly then dump a bucket of water in there it will back up and overflow.
I understand air and fluid cannot be compared but pressure is pressure....
Think of a clogged drain (Choked up downpipe), if you pour water into the drain slowly it will not back up and overflow. However if you pour slowly then dump a bucket of water in there it will back up and overflow.
I understand air and fluid cannot be compared but pressure is pressure....
Thread Starter
Evolving Member
Joined: Oct 2010
Posts: 112
Likes: 0
From: new jersey
Can't thank Adam enough for helping. This is my daily driver and I work a lot and have a 2 year old. Also I have like zero mech skills so this may take sometime. Right now trying to give Adam some data logging.
Newbie
Joined: May 2012
Posts: 4
Likes: 0
From: California
Eliminating all possible angles. If the spring isn't strong enough to keep it closed all the way before hitting its target pressure, it could open up prematurely and fill the downpipe with pressure, then when it opens all the way there is already a ton of pressure built up and is causing back pressure.
Think of a clogged drain (Choked up downpipe), if you pour water into the drain slowly it will not back up and overflow. However if you pour slowly then dump a bucket of water in there it will back up and overflow.
I understand air and fluid cannot be compared but pressure is pressure....
Think of a clogged drain (Choked up downpipe), if you pour water into the drain slowly it will not back up and overflow. However if you pour slowly then dump a bucket of water in there it will back up and overflow.
I understand air and fluid cannot be compared but pressure is pressure....
