0.5 bar of boost
27 February 2009, 05:15 PM
#32
The restrictor works kind of like a 'bleed', the air bled from the BCS has to bleed at a certain rate so it acts on the BCS. ie if no restitor fitted the air just 'falls' down the pipe and the BCS feels no back pressure, if restrictor fitted air pressure backs up to the BCS before being 'forced' thru the restrictor which then allows the BCS to operate as Subaru intended. Where the air goes after it is bled is not really a concern, either back into the system or to atmosphere 
28 February 2009, 04:18 AM
#39
Iam 
Now i'm not 100% sure on this but, i think not having the pill fitted will effect the spool time
Someone will pick me up if that is not the case 
Last edited by Glowplug; 28 February 2009 at 04:20 AM.
28 February 2009, 08:25 AM
#41
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This sounds like you are running wastegate boost pressure. When this happened on my bugeye it was the boost solenoid that was knackered. See if you can find someone who can loan oyu one to test it, they can be had cheap enough second-hand. Also, the spring on your wastegate could be worn and not holding the boost. This is apparently a common problem on classics, so a new wastegate might be the order of the day.
28 February 2009, 08:40 AM
#42
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cheers for the imput but i have changed the boost solinoid from scoobysmiffs car and i fitted a difrent turbo the other night so that should rule out the wastegate ,steven
01 March 2009, 05:48 AM
#43
Right, i have just re-rear the thread, and in post #1 you say
Also in post #1 you say
Which thinking about it (bear in mind that it's 05.30 and ive just got in from work
) tells me that the problem could lay with the install of the engine
You've had 2 different BCS's and 2 different turbos on, with i assume 2 different wastegates and actuators, so the BCS, turbo and wastegate assy have been petty much ruled out
So as
and all the suggestions in this thread have failed to resolve it, it may be time to check you wired and plumbed everything correctly after the engine change, or take to a specilist and have it checked
) tells me that the problem could lay with the install of the engineYou've had 2 different BCS's and 2 different turbos on, with i assume 2 different wastegates and actuators, so the BCS, turbo and wastegate assy have been petty much ruled out
So as
02 March 2009, 04:30 AM
#46
There's always hope, i hope, otherways i'm ****'d
As mentioned in post #20, you could disconnect the pipe from the wastegate and go for a 'very' controlled drive just to make sure the turbo is boosting
Disconnect the pipe from the wastegate actuator and see if it boosts up, but be very very carefull, no foot to the floor, just watch the boost gauge and dont go over 1 bar, this will eliminate the turbo being at fault
As mentioned in post #20, you could disconnect the pipe from the wastegate and go for a 'very' controlled drive just to make sure the turbo is boostingDisconnect the pipe from the wastegate actuator and see if it boosts up, but be very very carefull, no foot to the floor, just watch the boost gauge and dont go over 1 bar, this will eliminate the turbo being at fault
02 March 2009, 11:24 AM
#49
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Mate,
I had the very same problem with my old 93 wrx. Every week for about 30mins it would only boost to 0.5bar, then somehow it would boost back to 0.8bar of its own accord???
I changed the ecu, boost solonoid (with pipes), turbo, all the pressure sensors, afm, O2 sensor.......and basically everything associated with boost control.
Still did it until I fitted a Polar performance ecu chip (takes boost from 0.8 to 1.1bar and adjusts the fuelling)
After fitting the chip it never did it again and ran perfectly for 12mths then I sold it and the new owner has had no probs either.
Go onto the General technical page, in the search field type in '0.5bar boost...' should come up with my thread
I had the very same problem with my old 93 wrx. Every week for about 30mins it would only boost to 0.5bar, then somehow it would boost back to 0.8bar of its own accord???
I changed the ecu, boost solonoid (with pipes), turbo, all the pressure sensors, afm, O2 sensor.......and basically everything associated with boost control.
Still did it until I fitted a Polar performance ecu chip (takes boost from 0.8 to 1.1bar and adjusts the fuelling)
After fitting the chip it never did it again and ran perfectly for 12mths then I sold it and the new owner has had no probs either.
Go onto the General technical page, in the search field type in '0.5bar boost...' should come up with my thread
03 March 2009, 07:46 PM
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thats me just going to nip down the garage and get 5 litters a petrol and a box of matches now lol still cant pin it down to anything to many sleepless nights thought i would have got boost without actuator conected 
03 March 2009, 09:55 PM
#54
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yepeeee finally got just under one bar of boost, went through ecu reset again may i ad and was running better just a quick question tho once you reset your ecu does the car take tim to remember its setting cause at the start it wasnt getting 0.9 bar untill just after 6k revs but as i drove the car longer i started getting about a bar at 5 1/2 anybody
03 March 2009, 10:37 PM
#55
yepeeee finally got just under one bar of boost, went through ecu reset again may i ad and was running better just a quick question tho once you reset your ecu does the car take tim to remember its setting cause at the start it wasnt getting 0.9 bar untill just after 6k revs but as i drove the car longer i started getting about a bar at 5 1/2 anybody
Your Ecu does learn but only as far as advancing/retarding ignition. Pleased you have it sorted
16 March 2009, 05:55 PM
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hey sorry for bringing this up again but its a recent thread
i replied on page 1 - i had this problem all of a sudden but it sorted itself out a day or two later
after a few weeks of normal operation its back to 0.5 bar
im not sure how to reset ecu can anyone point me in right direction ? and it wont **** anything up will it doing this ?
im also gonna plug the black n green plugs under dash first to read any faults there maybe
thanks
i replied on page 1 - i had this problem all of a sudden but it sorted itself out a day or two later
after a few weeks of normal operation its back to 0.5 bar
im not sure how to reset ecu can anyone point me in right direction ? and it wont **** anything up will it doing this ?
im also gonna plug the black n green plugs under dash first to read any faults there maybe
thanks
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