No bung in dump valve
13 January 2010, 10:56 PM
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No bung in dump valve
Recently bought another Impreza but just noticed, it has an after market dump valve but no bung in the hose, its just lying open?
The car runs fine, but will this do damage or will I be losing power through this?
The car runs fine, but will this do damage or will I be losing power through this?
13 January 2010, 11:01 PM
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Yikes. Are you sure the recirc pipe hasn't been bunged further up its length somewhere?
If it really is open, that's properly not good, as it will be allowing the engine to ingest copious amounts of hot, unfiltered intake air. If you're on a standard, MAF-based ECU the mixtures will be all over the place (probably dangerously so), and if the det doesn't damage it, the consequences of unfiltered air won't be good either.
So, yes, if the pipe is open you will be doing damage, no question. As for losing power, chances are you're gaining some - at least up until the point the engine says it's had enough.
If it really is open, that's properly not good, as it will be allowing the engine to ingest copious amounts of hot, unfiltered intake air. If you're on a standard, MAF-based ECU the mixtures will be all over the place (probably dangerously so), and if the det doesn't damage it, the consequences of unfiltered air won't be good either.
So, yes, if the pipe is open you will be doing damage, no question. As for losing power, chances are you're gaining some - at least up until the point the engine says it's had enough.
13 January 2010, 11:04 PM
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Yikes. Are you sure the recirc pipe hasn't been bunged further up its length somewhere?
If it really is open, that's properly not good, as it will be allowing the engine to ingest copious amounts of hot, unfiltered intake air. If you're on a standard, MAF-based ECU the mixtures will be all over the place (probably dangerously so), and if the det doesn't damage it, the consequences of unfiltered air won't be good either.
So, yes, if the pipe is open you will be doing damage, no question. As for losing power, chances are you're gaining some - at least up until the point the engine says it's had enough.
If it really is open, that's properly not good, as it will be allowing the engine to ingest copious amounts of hot, unfiltered intake air. If you're on a standard, MAF-based ECU the mixtures will be all over the place (probably dangerously so), and if the det doesn't damage it, the consequences of unfiltered air won't be good either.
So, yes, if the pipe is open you will be doing damage, no question. As for losing power, chances are you're gaining some - at least up until the point the engine says it's had enough.
Its got a mafless ecu in it and theres no pipe on it whatsoever
Last edited by McFartenplop; 13 January 2010 at 11:05 PM.
13 January 2010, 11:08 PM
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In which case the danger of leaning should reduce but it will still be sucking in unfiltered air - which, depending on where the air temperature sensor is in your inlet tract, is probably mucking about with the ECU's SD calculations.
As above, if you're sure the pipe isn't blocked somewhere you can't see, this isn't good.
So we know exactly what we're dealing with here, is the mounting spigot on the intake pipe blocked or open? If it's open, the answer's as above, driving around allowing it to suck in unfiltered air from directly above the engine is a bad idea.
If there's a bung on the inlet pipe (or there's an aftermarket inlet without the recirc mounting spigot), there's no need for this thread.
As above, if you're sure the pipe isn't blocked somewhere you can't see, this isn't good.
So we know exactly what we're dealing with here, is the mounting spigot on the intake pipe blocked or open? If it's open, the answer's as above, driving around allowing it to suck in unfiltered air from directly above the engine is a bad idea.
If there's a bung on the inlet pipe (or there's an aftermarket inlet without the recirc mounting spigot), there's no need for this thread.
14 January 2010, 08:00 AM
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That'd be the default response with a standard ECU, and may still be the best way forward with the one you've got.
However, before doing so it might be worth having a word with whoever mapped the car, if you know who it was, or else another mapper who works with the same ECUs to see if there are any specific recommendations.
The one thing you can't do is leave it as it is, if indeed the recirc pipe connector on the turbo inlet is still open to the air. One would hope you'll find on close inspection that it has been bunged right there and the entire recirc pipe assembly removed. If it's been left open, then it's anybody's guess what sort of nick the turbo and engine internals will be in as a result of potential dirt and dust ingestion.
However, before doing so it might be worth having a word with whoever mapped the car, if you know who it was, or else another mapper who works with the same ECUs to see if there are any specific recommendations.
The one thing you can't do is leave it as it is, if indeed the recirc pipe connector on the turbo inlet is still open to the air. One would hope you'll find on close inspection that it has been bunged right there and the entire recirc pipe assembly removed. If it's been left open, then it's anybody's guess what sort of nick the turbo and engine internals will be in as a result of potential dirt and dust ingestion.
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