up pipe
22 July 2008, 04:45 PM
#1
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up pipe
hi all 
just wondering if there are any benefit of changing the up pipe on my 04 scoob 
is there any gains to be made , bhp noise so on , got a h&s back box and de cat centre pipe so far working on getting funds for a down pipe with 100 cell cat induction kit and ecutek ecu remap
just wondering if there are any benefit of changing the up pipe on my 04 scoob is there any gains to be made , bhp noise so on , got a h&s back box and de cat centre pipe so far working on getting funds for a down pipe with 100 cell cat induction kit and ecutek ecu remap
22 July 2008, 04:50 PM
#2
iirc it'll effect spool up. power gains are likely to be top end rather than lower down. don't think it'll effect noise too much. imo you'd be better off getting the downpipe and leaving the up pipe for the time being. although not sure if the newages have a cat in the up pipes as well as the dp?
sure frayz will be along soon to give a better answer.
sure frayz will be along soon to give a better answer.
22 July 2008, 05:17 PM
#3
Makes a fair difference tbh.
Two fairly identical WRX's
Only difference is the Apollo induction and PPP Sports cat, no decat uppie.
https://www.scoobynet.com/group-buys...ml#post6565136
And my 53WRX running no Apollo, H&S sports cat and the decat Uppipe.
https://www.scoobynet.com/group-buys...ml#post6451923
Equates to 25bhp and 4ftlbs torque
and quicker in gear times 
The induction kit was actually pretty good for reducing intake temps !
Two fairly identical WRX's
Only difference is the Apollo induction and PPP Sports cat, no decat uppie.
https://www.scoobynet.com/group-buys...ml#post6565136
And my 53WRX running no Apollo, H&S sports cat and the decat Uppipe.
https://www.scoobynet.com/group-buys...ml#post6451923
Equates to 25bhp and 4ftlbs torque
and quicker in gear times The induction kit was actually pretty good for reducing intake temps !
22 July 2008, 08:32 PM
#5
The newage WRX has a cat in the U/P the STI does not. Yes it will most definiately help but will require a remap. If doing so id recomend an additional decat downpipe or sports catted downpipe to make the most of your gains.
Be warned though, dont go buying any old U/P off of eBay or whatever. The bore of the U/P has a huge effect on the spool of your turbo. If you are going to stick with teh stock TD04 turbocharger then a big bore U/P wont harm your spool too much as the tiny turbo spools like crazy anyway. Problems will arise when you have a big bore U/P and then swap to a larger turbocharger such as a 20g or larger... even a 20g is a bit small to be affected too much.
The larger bore of the pipe dramatically slows the gas speed and therefore response of the turbocharger.
You best bet is to by the stock U/P from a newage STI as these have quite a small bore and are readilly available. Cheap too.
Be warned though, dont go buying any old U/P off of eBay or whatever. The bore of the U/P has a huge effect on the spool of your turbo. If you are going to stick with teh stock TD04 turbocharger then a big bore U/P wont harm your spool too much as the tiny turbo spools like crazy anyway. Problems will arise when you have a big bore U/P and then swap to a larger turbocharger such as a 20g or larger... even a 20g is a bit small to be affected too much.
The larger bore of the pipe dramatically slows the gas speed and therefore response of the turbocharger.
You best bet is to by the stock U/P from a newage STI as these have quite a small bore and are readilly available. Cheap too.
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