Mild overboost...and now NO boost!
#1
Mild overboost...and now NO boost!
Hi guys,
I have a very lightly modded 2003 Evo that was set-up by the guys at TurboTrix. All I have is a 3" Buschur turbo-back, a Buschur filter, and a Hallman MBC set to 20 psi. Mark at TurboTrix reflashed the ECU with a custom dyno tune and the car makes around 295-300 wheel hp. Like I said...pretty mild.
The car was returned to stock back in January (I considered trading it for an Evo 8 MR...but I changed my mind). I took the car to a local shop to get everything re-installed. Here's what happened:
The shop plumbed in the EBC the way they told me to at TurboTrix: turbo outlet nipple to bottom of controller, wastegate actuator to side of controller. Then the car went up on an AWD DynaPack.
On the first run, the car overboosted to about 25 psi. I don't know how they let that happen...but it happened. In the middle of the run, the car sort of stuttered for a second. Ever since then, we can't get the car to boost more then 12-13 psi no matter what we do!
What is the problem? Wastegate actuator? Boost solenoid? The wastegate itself? PLEASE HELP!!!
Emre
I have a very lightly modded 2003 Evo that was set-up by the guys at TurboTrix. All I have is a 3" Buschur turbo-back, a Buschur filter, and a Hallman MBC set to 20 psi. Mark at TurboTrix reflashed the ECU with a custom dyno tune and the car makes around 295-300 wheel hp. Like I said...pretty mild.
The car was returned to stock back in January (I considered trading it for an Evo 8 MR...but I changed my mind). I took the car to a local shop to get everything re-installed. Here's what happened:
The shop plumbed in the EBC the way they told me to at TurboTrix: turbo outlet nipple to bottom of controller, wastegate actuator to side of controller. Then the car went up on an AWD DynaPack.
On the first run, the car overboosted to about 25 psi. I don't know how they let that happen...but it happened. In the middle of the run, the car sort of stuttered for a second. Ever since then, we can't get the car to boost more then 12-13 psi no matter what we do!
What is the problem? Wastegate actuator? Boost solenoid? The wastegate itself? PLEASE HELP!!!
Emre
#2
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Just a thought: did you throw a SEL light? Try re-setting the ECU, My boost was all messed up last week, but it was a MBC not a EBC. also get heavy duty hose clamps and tighten every hose, check all vacume lines, I got a MR BOV and it seemed to help a lot. just some ideas. I hope you get it fixed soon. best of luck.
#3
Originally Posted by Deepseadiver
Just a thought: did you throw a SEL light? Try re-setting the ECU
Originally Posted by Deepseadiver
also get heavy duty hose clamps and tighten every hose, check all vacume lines
Originally Posted by Deepseadiver
I got a MR BOV and it seemed to help a lot.
Originally Posted by Deepseadiver
just some ideas. I hope you get it fixed soon. best of luck.
Emre
#4
boost solenoid is open so pressure is not being held back from actuator. The car is boosting on the actuator only (11-12 psi of boost). Something is wrong with the EBC.
#6
Originally Posted by timzcat
boost solenoid is open so pressure is not being held back from actuator. The car is boosting on the actuator only (11-12 psi of boost). Something is wrong with the EBC.
Also, does anyone have a good source for these stock parts in case I need to change them? Is there an "upgrade" for the wastegate actuator or diverter valve...maybe from the MR or JDM evo or something?
Emre
Last edited by Kayaalp; Apr 10, 2005 at 06:32 AM.
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quote The shop plumbed in the EBC the way they told me to at TurboTrix: turbo outlet nipple to bottom of controller, wastegate actuator to side of controller. Then the car went up on an AWD DynaPack.
Sounds to me like you have it plumbed incorrect. The factory ebc does not run off boost, its a bleeding valve. you need to "Y" both nipples "wastegate and turbo nipple" together to the firewall side of the ebc and the front end side of ebc has to be plumbed between the maf and turbo "intake"
Sounds to me like you have it plumbed incorrect. The factory ebc does not run off boost, its a bleeding valve. you need to "Y" both nipples "wastegate and turbo nipple" together to the firewall side of the ebc and the front end side of ebc has to be plumbed between the maf and turbo "intake"
#10
Originally Posted by an0ther
Sounds to me like you have it plumbed incorrect. The factory ebc does not run off boost, its a bleeding valve. you need to "Y" both nipples "wastegate and turbo nipple" together to the firewall side of the ebc and the front end side of ebc has to be plumbed between the maf and turbo "intake"
Emre
#12
When you say EBC in the first post what is it, stock or aftermarket?
Was the boost control put back to stock? I don't get a MBC to EBC change if you were going back to stock.
Were the stock hoses for boost control reistalled?
I can almost guarantee the wastegate is not damaged. I need more information and I will tell you the problem.
Was the boost control put back to stock? I don't get a MBC to EBC change if you were going back to stock.
Were the stock hoses for boost control reistalled?
I can almost guarantee the wastegate is not damaged. I need more information and I will tell you the problem.
#13
Originally Posted by timzcat
When you say EBC in the first post what is it, stock or aftermarket?
Was the boost control put back to stock? I don't get a MBC to EBC change if you were going back to stock.
Was the boost control put back to stock? I don't get a MBC to EBC change if you were going back to stock.
Originally Posted by timzcat
Were the stock hoses for boost control reistalled?
Originally Posted by timzcat
I can almost guarantee the wastegate is not damaged. I need more information and I will tell you the problem.
We re-set the ECU (unplugged the battery for 5 minutes...then again for 15 minutes) and it didn't help. We removed the DV and it seems to work (opens and closes). The wastegate actuator opens and closes at around 10-11 psi (when we tested with compressed air). Everything "looks" ok.
Emre
#14
Well, we finally got to the bottom of the problem. It was the stock diverter valve. Even though it seemed to open and close properly, it was not holding boost. We installed a new diverter valve from Dahlback Racing:
Now everything seems like it's working fine. Thanks to everyone for their advice!
Emre
Now everything seems like it's working fine. Thanks to everyone for their advice!
Emre
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