location of my 'up pipe' ?
does anyone know where my up pipe is on my 04' sti? is it worth changing it?
dan |
Originally Posted by HT04
(Post 8151634)
does anyone know where my up pipe is on my 04' sti? is it worth changing it?
dan |
Your up pipe connects from the bottom of the turbo to the passenger side manifold. I think that the sti up pipe is de catted anyway so no need to change. I'm not completely sure but someone else may be able to confirm everything.
http://i46.photobucket.com/albums/f1...n/Exhaust1.gif http://i46.photobucket.com/albums/f1...n/Exhaust2.jpg |
When I decatted my WRX up pipe, I was advised to get an STi pipe because it was the best one (and has no cat). I don't see any reason to change yours.
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just to jump on board with this one - are they a pig of a job to change? or easy peasy? i've got a bug wrx and the up-pipe is leaking/blowing so was gonna get a decat one and swap it.....
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I was in at my local subaru dealer at the weekend and was asking one of the mechanics out of interest about the time it would take to change the up pipe. He said it could take up 6 hours, maybe even a day depending on the condition of the bolts. Seems a bit extreme to me though. Want mine done at some point too so I won't be going to Subaru, 55 + vat per hour. Scarey.
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The STi up-pipe is simply a pipe........ forget about it unless you are after big power :)
The Newage 2.0 litre WRX up-pipes have a pre-cat and an EGT sensor :) ....they tend to get in the way over 280 to 300 odd BHP and can be swapped over to a de-cat :) The bolts are a nightmare at times (so I have heard) so a local subaru specialist would be a good idea (not dealer) if you are as useless as me with spanners LOL Shaun |
Does swapping it out make a big difference in spool up time? Andy Forrest was telling me that I would gain a few BHP by removing it but the turbo response is what I'm after.
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Meallbahn
Are you running a Bugeye WRX.....if so the big restriction is after the turbo with the crippling downpipe cat :( Shaun |
Mine came off in about six hours.... on the drive, mostly hacking through rusted bolts...
HTH DunxC P.S. I love bank holidays....:luxhello: |
Originally Posted by Midlife......
(Post 8152211)
Meallbahn
Are you running a Bugeye WRX.....if so the big restriction is after the turbo with the crippling downpipe cat :( Shaun Jonny. |
Originally Posted by Meallbhan
(Post 8152127)
I was in at my local subaru dealer at the weekend and was asking one of the mechanics out of interest about the time it would take to change the up pipe. He said it could take up 6 hours, maybe even a day depending on the condition of the bolts. Seems a bit extreme to me though. Want mine done at some point too so I won't be going to Subaru, 55 + vat per hour. Scarey.
6hrs:wonder: must be taking engine out too my m8 changed both gaskets on my up pipe, 3" / 3 bolt type with 12mm bolts so very tight to get to top bolt, All in it took 2hrs included stripping out intercooler, un-bolting downpipe, un-bolting turbo, un-bolting uppipe at top, loosen bolts on headers, removing bolts from headers to up pipe (3bolts), replacing gaskets, then put back together. all done on my driveway using a trolley jack for access under car only charged me 20 quid too:thumb: |
Jonny
It depends on what BHP you are chasing...On your standard turbo (TD04L) I don't think that it's worth messing with the up-pipe. The TD04 being small has a teriffic spool up (turbo threshold) which won't be altered a lot by changing the up-pipe :) Turbo cars are very sensitive to intake / charge temps quite a few BHP is lost on a warm day so with the winter coming, so it's not all down to mechanical things ........ :) LOL I swapped my up-pipe when I changed the Turbo to something bigger because it needed more airflow to spin the turbo ... :) HTH Shaun |
Thanks Shaun.
One more question for anyone who knows . . . What happens to the Lamda/oxy sensor on the mid pipe (I think) when you de cat. Is it on the mid pipe or downpipe, I can't remember. Does the wire get snipped or something? |
The 02 sensor after the turbo is there to measure the efficiency of the Cat......if the cat is missing then the ECU throws P0420 CEL :(
Can be mapped out by Andy Forrest (best way) or there are a a few CEL fixes :D The Bottom line is that the newage WRX's left the factory completely crippled on the performance front and can be completely transformed by re-mapping :D Shaun |
Cheers, yeah I understand that a remap would sort this problem out but I'm not sure what actually happens to the sensor itself. Does the decat section have a bung to plug the hole where the sensor would go or is there no hole to bung in the new exhaust part? Also does the sensor just get unplugged then and the other end of the wire get taped up?
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After mapping The ECU doesn't "see" the real sensor anymore.
all the ECU sees is a happy virtual sensor created by the mapper......so the real sensor can be left in situ (usually) or removed. Shaun |
Originally Posted by Meallbhan
(Post 8157246)
Cheers, yeah I understand that a remap would sort this problem out but I'm not sure what actually happens to the sensor itself. Does the decat section have a bung to plug the hole where the sensor would go or is there no hole to bung in the new exhaust part? Also does the sensor just get unplugged then and the other end of the wire get taped up?
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Originally Posted by Meallbhan
(Post 8157246)
Cheers, yeah I understand that a remap would sort this problem out but I'm not sure what actually happens to the sensor itself. Does the decat section have a bung to plug the hole where the sensor would go or is there no hole to bung in the new exhaust part? Also does the sensor just get unplugged then and the other end of the wire get taped up?
As for the STi up-pipe, don't change it for the sake of it, unless it is broken - its a pig of a job. meallbhan - if you are changing the exhuast to that degree then half the job to remove the up-pipe is done, so I'd swap to the Sti up-pipe. You'll need a resistor to compensate for losing the EGT sensor though. Nick |
Originally Posted by Butty
(Post 8157847)
The sensor still gets fitted but the mapper alters a higher signal threshold before the CEL is triggered.
As for the STi up-pipe, don't change it for the sake of it, unless it is broken - its a pig of a job. meallbhan - if you are changing the exhuast to that degree then half the job to remove the up-pipe is done, so I'd swap to the Sti up-pipe. You'll need a resistor to compensate for losing the EGT sensor though. Nick I don't understand what the EGT sensor and resistor are for though. So for asking so many questions but I want to get it right first time I do it with no hiccups! I live way up north so long journeys are required to get things done. |
Originally Posted by Meallbhan
(Post 8158109)
So when changing the downpipe half the job is done for doing the up pipe too, so I may as well change that at the same time? Is that what you mean?
I don't understand what the EGT sensor and resistor are for though. So for asking so many questions but I want to get it right first time I do it with no hiccups! I live way up north so long journeys are required to get things done. The EGT is Exhaust Gas Temperature sensor which monitors for harmful temps. The resistor fools the ECU into thinking everything is OK. If you have it all done by a specialist, you shouldn't have to worry about sensors and CELs (I didn't know all this when I had mine done, it was just given back to me with the work all done.) |
Originally Posted by Mark'sWRX
(Post 8158202)
If you have it all done by a specialist, you shouldn't have to worry about sensors and CELs (I didn't know all this when I had mine done, it was just given back to me with the work all done.)
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AFAIK you cannot map out the missing EGT sensor for the WRX ... the WRX expects to see the EGT sensor in place and if it's not there then the ECU throws a CEL . You can fool the ECU by putting a resistor in the Plug by the drivers side suspension turret but it's not 100% .
Andy Forrest is 110% spot on :) if you have an apointment for mapping then just ask for advice :D Shaun |
AWD is the name of the subaru specialist in perth, they have a good reputation:thumb:
AWD Motorsport Engineering for subaru, mitsubishi, nissan performance car modification, servicing, spare parts and helpful advice AWD Motorsport Engineering, Unit 5, Inveralmond Way, Inveralmond Ind. Estate, Perth, PH1 3UQ, |
^ Thats them, have heard good reports too. Cheers. Will need to give them a buzz and get a rough idea of costs involved. :thumb:
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