Subaru Boost/ECU problems Help!!!
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Scooby Regular
Joined: May 2010
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Subaru Boost/ECU problems Help!!!
Hi
I have had issues with my WRX Turbo Import. It is a classic 1994 Turbo.
running a full S/Steel Exhaust Blitz Nur spec. Has a Apexi Filter filter.
It did have a Mines ECu but it wasnt running right. the Emissions was 10.2CO but boosted at 1bar and was fine.
Now I have purchased a Z4 ECU and just put it on, Just gone to work and now it runs 0.4 on the CO.
But the boost is now all over the place. Sometimes in 2nd gear it is 0.9bar but then sometimes is nearly 1.5bar. and 3rd gear is always 1.5bar. As soon as it does this I back off as I dont want to blow it up.
What do people think? and what can I do??
Baz
I have had issues with my WRX Turbo Import. It is a classic 1994 Turbo.
running a full S/Steel Exhaust Blitz Nur spec. Has a Apexi Filter filter.
It did have a Mines ECu but it wasnt running right. the Emissions was 10.2CO but boosted at 1bar and was fine.
Now I have purchased a Z4 ECU and just put it on, Just gone to work and now it runs 0.4 on the CO.
But the boost is now all over the place. Sometimes in 2nd gear it is 0.9bar but then sometimes is nearly 1.5bar. and 3rd gear is always 1.5bar. As soon as it does this I back off as I dont want to blow it up.
What do people think? and what can I do??
Baz
Z4 should be cutting the boost at about 1.1bar, sounds like you could have other mods on it some where. Aftermarket boost controller or fuel cut defender of some sort.
Hard to tell on a forum mate
Hard to tell on a forum mate
Scooby Regular
Joined: Jul 2007
Posts: 42
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From: swindon
mate it sound like the restrictor pill in the boost pipework maybe missing as your other ecu might not of need it.
this may help
3 Port Solenoid System
From the turbo outlet there should be a long pipe that goes straight to the top port of the solenoid, then another pipe connects the side port of the solenoid to the wastegate actuator, the final pipe connects the bottom port of the solenoid to the intake/resinator box, this section of pipe should have a brass/alloy restrictor pill within it.
How the systems works ‘Basic’
2 port system ‘Bleed System’
If the turbo outlet was connected by pipe straight to the wastegate actuator the wastegate actuator would always open at its spring rate (normally 0.5 BAR) to achive higher than wastegate ‘spring rate’ pressure you need to bleed air away from the actuator to prevent it from opening the wastegate at its spring rate pressure, to do this on the 2 port system a ‘t’ piece is inserted in the middle of the pipe that connects the turbo outlet straight to the wastegate actuator then a pipe is run from this ‘t’ piece to the solenoid, what the solenoid does is open and close a port to allow a controlled bleed (governed by the ECU-solenoid duty cycle) out of the pipes to keep the air pressure within the pipes below the 0.5 BAR that opens the wastegate, without the restrictor pill in the first pipe between the turbo and the ‘t’ piece the air passing from the turbo into the pipes cannot be bled off quickly enough to prevent the wastegate actuator opening the wastegate the result of this would be poor boost responce, so what the restrictor does in effect is cause a pressure drop and slows everything down to allow the solenoid to deal with a much lower/slower volume of air, the smaller you make therestrictor hole the greater the pressure drop and the easier it is for the solenoid to keep the pressure in the system below 0.5 BAR (spring rate pressure)which will result in higher boost output, a larger restrictor hole the smaller the pressure drop will be and the harder it is for the solenoid to keep the pressure in the pipes below (spring rate pressure) which will result in lower boost output. (Please do not adjust the restrictor hole size unless you know what you are doing)
this may help
3 Port Solenoid System
From the turbo outlet there should be a long pipe that goes straight to the top port of the solenoid, then another pipe connects the side port of the solenoid to the wastegate actuator, the final pipe connects the bottom port of the solenoid to the intake/resinator box, this section of pipe should have a brass/alloy restrictor pill within it.
How the systems works ‘Basic’
2 port system ‘Bleed System’
If the turbo outlet was connected by pipe straight to the wastegate actuator the wastegate actuator would always open at its spring rate (normally 0.5 BAR) to achive higher than wastegate ‘spring rate’ pressure you need to bleed air away from the actuator to prevent it from opening the wastegate at its spring rate pressure, to do this on the 2 port system a ‘t’ piece is inserted in the middle of the pipe that connects the turbo outlet straight to the wastegate actuator then a pipe is run from this ‘t’ piece to the solenoid, what the solenoid does is open and close a port to allow a controlled bleed (governed by the ECU-solenoid duty cycle) out of the pipes to keep the air pressure within the pipes below the 0.5 BAR that opens the wastegate, without the restrictor pill in the first pipe between the turbo and the ‘t’ piece the air passing from the turbo into the pipes cannot be bled off quickly enough to prevent the wastegate actuator opening the wastegate the result of this would be poor boost responce, so what the restrictor does in effect is cause a pressure drop and slows everything down to allow the solenoid to deal with a much lower/slower volume of air, the smaller you make therestrictor hole the greater the pressure drop and the easier it is for the solenoid to keep the pressure in the system below 0.5 BAR (spring rate pressure)which will result in higher boost output, a larger restrictor hole the smaller the pressure drop will be and the harder it is for the solenoid to keep the pressure in the pipes below (spring rate pressure) which will result in lower boost output. (Please do not adjust the restrictor hole size unless you know what you are doing)
Thread Starter
Scooby Regular
Joined: May 2010
Posts: 63
Likes: 0
mate it sound like the restrictor pill in the boost pipework maybe missing as your other ecu might not of need it.
this may help
3 Port Solenoid System
From the turbo outlet there should be a long pipe that goes straight to the top port of the solenoid, then another pipe connects the side port of the solenoid to the wastegate actuator, the final pipe connects the bottom port of the solenoid to the intake/resinator box, this section of pipe should have a brass/alloy restrictor pill within it.
How the systems works ‘Basic’
2 port system ‘Bleed System’
If the turbo outlet was connected by pipe straight to the wastegate actuator the wastegate actuator would always open at its spring rate (normally 0.5 BAR) to achive higher than wastegate ‘spring rate’ pressure you need to bleed air away from the actuator to prevent it from opening the wastegate at its spring rate pressure, to do this on the 2 port system a ‘t’ piece is inserted in the middle of the pipe that connects the turbo outlet straight to the wastegate actuator then a pipe is run from this ‘t’ piece to the solenoid, what the solenoid does is open and close a port to allow a controlled bleed (governed by the ECU-solenoid duty cycle) out of the pipes to keep the air pressure within the pipes below the 0.5 BAR that opens the wastegate, without the restrictor pill in the first pipe between the turbo and the ‘t’ piece the air passing from the turbo into the pipes cannot be bled off quickly enough to prevent the wastegate actuator opening the wastegate the result of this would be poor boost responce, so what the restrictor does in effect is cause a pressure drop and slows everything down to allow the solenoid to deal with a much lower/slower volume of air, the smaller you make therestrictor hole the greater the pressure drop and the easier it is for the solenoid to keep the pressure in the system below 0.5 BAR (spring rate pressure)which will result in higher boost output, a larger restrictor hole the smaller the pressure drop will be and the harder it is for the solenoid to keep the pressure in the pipes below (spring rate pressure) which will result in lower boost output. (Please do not adjust the restrictor hole size unless you know what you are doing)
this may help
3 Port Solenoid System
From the turbo outlet there should be a long pipe that goes straight to the top port of the solenoid, then another pipe connects the side port of the solenoid to the wastegate actuator, the final pipe connects the bottom port of the solenoid to the intake/resinator box, this section of pipe should have a brass/alloy restrictor pill within it.
How the systems works ‘Basic’
2 port system ‘Bleed System’
If the turbo outlet was connected by pipe straight to the wastegate actuator the wastegate actuator would always open at its spring rate (normally 0.5 BAR) to achive higher than wastegate ‘spring rate’ pressure you need to bleed air away from the actuator to prevent it from opening the wastegate at its spring rate pressure, to do this on the 2 port system a ‘t’ piece is inserted in the middle of the pipe that connects the turbo outlet straight to the wastegate actuator then a pipe is run from this ‘t’ piece to the solenoid, what the solenoid does is open and close a port to allow a controlled bleed (governed by the ECU-solenoid duty cycle) out of the pipes to keep the air pressure within the pipes below the 0.5 BAR that opens the wastegate, without the restrictor pill in the first pipe between the turbo and the ‘t’ piece the air passing from the turbo into the pipes cannot be bled off quickly enough to prevent the wastegate actuator opening the wastegate the result of this would be poor boost responce, so what the restrictor does in effect is cause a pressure drop and slows everything down to allow the solenoid to deal with a much lower/slower volume of air, the smaller you make therestrictor hole the greater the pressure drop and the easier it is for the solenoid to keep the pressure in the system below 0.5 BAR (spring rate pressure)which will result in higher boost output, a larger restrictor hole the smaller the pressure drop will be and the harder it is for the solenoid to keep the pressure in the pipes below (spring rate pressure) which will result in lower boost output. (Please do not adjust the restrictor hole size unless you know what you are doing)
Many thanks for this info. Just and checked mine, The bottom pipe that you say should have a restrcitor in isnt a standard subaru pipe, It is just a normal hose and doesnt have anything in it. the other two pipes on the solenoid are standard Subaru pipes. So looks as though it has been played with.
So do i need to get one of these pipes? Or is there anything else I can do to it?
Cheers again
Scooby Regular
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Joined: Apr 2005
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From: In the Flatlands of Lincolnshire
It sounds like you have workshop facilities. So get a piece of brass or alloy that is a VERY tight fit in the pipe and drill a 1 mm hole through it and insert a good way into the pipe. The essential bit is that it cannot freely move in the pipe.
https://www.scoobynet.com/general-te...ctor-pill.html
If it's boosting to 1.5bar you have other issues too
If it's boosting to 1.5bar you have other issues too
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Scooby Regular
Joined: Jul 2007
Posts: 42
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From: swindon
Many thanks for this info. Just and checked mine, The bottom pipe that you say should have a restrcitor in isnt a standard subaru pipe, It is just a normal hose and doesnt have anything in it. the other two pipes on the solenoid are standard Subaru pipes. So looks as though it has been played with.
So do i need to get one of these pipes? Or is there anything else I can do to it?
Cheers again
So do i need to get one of these pipes? Or is there anything else I can do to it?
Cheers again
Thread Starter
Scooby Regular
Joined: May 2010
Posts: 63
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HI
just wanted to say thank you to everyone for helping me... Job sorted now. Used a welding tip as advised and now it runs sweet.
thanks
Again
Baz
Thread Starter
Scooby Regular
Joined: May 2010
Posts: 63
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Hi again.. More running issues with my Scooby,
It now boosts to about 1bar, Then drops to about 0.7bar then as the revs go up so does the boost, So by the time you've got to about 6000rpm the boost is back up at a bar.
Sorry to sound thick but I'm new to the scooby's. I've had turbo cars before and they've always peaked then dropped down a little but never gained as the revs did!
Is this ok?
Cheers
Baz
It now boosts to about 1bar, Then drops to about 0.7bar then as the revs go up so does the boost, So by the time you've got to about 6000rpm the boost is back up at a bar.
Sorry to sound thick but I'm new to the scooby's. I've had turbo cars before and they've always peaked then dropped down a little but never gained as the revs did!
Is this ok?
Cheers
Baz
Thread Starter
Scooby Regular
Joined: May 2010
Posts: 63
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Just done my Rocker cover gaskets, Plugs, Balanced all my wheels then done 4wheel track on it, Then took it out for a spin.
Tghe boost is still playing up, It will only boost to about 0.6bar in 2nd gear then into 3rd gear it boosts to a bar then drops slightly then boosts about 1.3bar which is toop much for a standard set up barring exhaust and filter isnt it.
If I put the 0.8mm Restrictor pill back in it will boost up to a bar then drop to 0.7 then climvb back upto 1bar the higher you go in the revs. nI'm tempted to go back to the 0.8mm restrictor??
Or is there something else I'm missing??
Baz
Tghe boost is still playing up, It will only boost to about 0.6bar in 2nd gear then into 3rd gear it boosts to a bar then drops slightly then boosts about 1.3bar which is toop much for a standard set up barring exhaust and filter isnt it.
If I put the 0.8mm Restrictor pill back in it will boost up to a bar then drop to 0.7 then climvb back upto 1bar the higher you go in the revs. nI'm tempted to go back to the 0.8mm restrictor??
Or is there something else I'm missing??
Baz
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