Helix downpipe and uppipe spool up?
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Joined: Sep 2003
Posts: 168
From: Stoughton, MA
Car Info: Sonic Yellow WRX
after a dyno i get full boost at 3200rpms. You can hear it start to spool from 2000rpm onward. The difference is in drivability. i highly recommend the combo. A good catback frees up flow as well. I recommend a borla hush or bosal.
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From: Longing for my ol' white '02 WRX :(
Car Info: 2016 Acura RDX ... meh. Um, nice subwoofer?
It seems to me that boost goes positive about 300rpm quicker than stock with pretty much any good aftermarket uppipe (i.e. I've had perrin and helix the same results).
jason
jason
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Joined: Jul 2003
Posts: 260
From: Columbus, OH Go Bucks
Car Info: Black WRX
I just got the combo deal from MPJ perfor Helix down and uppipe, i cant wait to get it installed, i had HKS downpipe, thing is a peice of crap, thanks for replying
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You should get a quicker spool with both on, mostly the up-pipe. Basically what you want to happen is increase exhaust gas velocity heading towards the turbo. That is why it isn't always good to get headers. You are increasing the volume of gas, but decreasing velocity. Getting the down-pipe will help the exhaust gas 'escape' from the turbo quicker keeping the turbine spinning more freely. When you have the cat there, you get exhaust coming back (backpressure) somewhat slowing down the turbine. The headers are good if you have a larger turbo that is good at high rpm's where it will need that increased exhaust gas volume. Just a short explanation. 
Originally posted by ScoobyStas
after a dyno i get full boost at 3200rpms. You can hear it start to spool from 2000rpm onward. The difference is in drivability. i highly recommend the combo. A good catback frees up flow as well. I recommend a borla hush or bosal.
after a dyno i get full boost at 3200rpms. You can hear it start to spool from 2000rpm onward. The difference is in drivability. i highly recommend the combo. A good catback frees up flow as well. I recommend a borla hush or bosal.
hey do u have more modS???? i mean full boost at 3200 with just a turbo back and a uppipe i doubt u can get FULL boost at 3200....