Over boost.......on my99
03 November 2003, 12:20 PM
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Ok i have recently had my car full decated (down pipe) and i have sec's and defi's fitted......
I have noticed the car over boost alot more.....
The car has been run on optimax and millers all it's life....
Sec's monitor before the decat read 17.1 psi max boost and now reads 17.9 psi ....
Defi's reading 1.4 bar on over boost and than settles down to 1.2 bar (approx) or 16.3 psi on full chat in 5th.
the car has a miltek zaust matted with a magnex twin dump system and runs samco hoses,,,,,,ECU appears standard.
many thanks
I have noticed the car over boost alot more.....
The car has been run on optimax and millers all it's life....
Sec's monitor before the decat read 17.1 psi max boost and now reads 17.9 psi ....
Defi's reading 1.4 bar on over boost and than settles down to 1.2 bar (approx) or 16.3 psi on full chat in 5th.
the car has a miltek zaust matted with a magnex twin dump system and runs samco hoses,,,,,,ECU appears standard.
many thanks
03 November 2003, 12:45 PM
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You can either try running a lesser ron rated fuel, or take the turbo restrictor down a "size", but that depends on whet diameter you are running at the moment.
If 08.mm take to 1.0mm
if 1.0 mm take to 1.25mm
It will mean "capping" the boost pressure if if you change the restrictor, but will stop it overboosting.
If 08.mm take to 1.0mm
if 1.0 mm take to 1.25mm
It will mean "capping" the boost pressure if if you change the restrictor, but will stop it overboosting.
03 November 2003, 02:05 PM
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I wouldn't agree with running a lower octane rating of fuel. That could if anything cause trouble of its own.
However, increasing the bore of the actuator restrictor is the best way to solve this problem.
However, increasing the bore of the actuator restrictor is the best way to solve this problem.
03 November 2003, 04:44 PM
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I know you can buy alternative restrictors from Subaru main dealers, but I don't profess to know whether they stock a complete range of sizes, or just the ones that are appropriate to the different models.
As you want to make the orifice a little bigger, you could get away with simply drilling the existing one out. However, it may be a safer bet to keep the original and make another to experiment with.
I've turned my own from brass bar in the past, but others have used brass woodscrews to equally good effect (cut off the head and thread to leave the plain shank).
You should be able to get HSS drills in 0.05mm size increments from a good local tool or model shop.
As you want to make the orifice a little bigger, you could get away with simply drilling the existing one out. However, it may be a safer bet to keep the original and make another to experiment with.
I've turned my own from brass bar in the past, but others have used brass woodscrews to equally good effect (cut off the head and thread to leave the plain shank).
You should be able to get HSS drills in 0.05mm size increments from a good local tool or model shop.
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