Test DUMP pipe
07-25-2004, 05:45 PM
#201
Adventurist.
It does not defeat the exhaust system, it totally removes it. Gas flow will always find the area of least resistance, with a cutout, it will pick the cutout. The dump reduces back pressure, thus reducing low end torque, but with a blower, your loss of torque at the low end is minimal, making it a win/win situation.
07-25-2004, 06:59 PM
#203
Adventurist.
The gains are minimal because the airflow is nothing compared to FI. The loss, although, is very parasitic if low torque is needed at all on an NA engine.
07-25-2004, 09:32 PM
#205
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Originally Posted by Smitty
Well I had some time on my hands today and decided to wire the SIM up..
Brad:.. the O2 you sent me is for the front O2 sensor, I needed the O2 for the Cat....
.. but thanks anyways..
Brad:.. the O2 you sent me is for the front O2 sensor, I needed the O2 for the Cat....
.. but thanks anyways..
Is the connector different?
07-26-2004, 07:26 AM
#207
Suzuka Master
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07-26-2004, 08:03 AM
#208
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Originally Posted by evilone
you wouldnt see any gains lets say if you had the dump pipe set up so that as your rpms raise your plate opens so when your at the top of the rpm band you would basicaly have a free flowing exhaust in turn giving you a higher top end speed??? i know that for the civic dc sprots makes a set a race only headers that end where the cat is and you dont put anything on after that.. im not saying that our engines are the same but dosent it bassicaly defeat the perpous of exhaust system?? im not trying to say your wrong because you know well more than i do about these things i just thought that the dump would help out in the top end with the plate wide open when it reaches high rpms.
p.s sorry i cant spell
p.s sorry i cant spell
So for $300 you can get the exhaust cut-out and then add another $100 - $200 to figure out a way to have it RPM controlled (it would require a time delayed relay otherwise you will burn up the cut-out motor). IMO, that $500 could be better spent if just some temporary power increase is desired, i.e. a nitrous system.
07-26-2004, 09:18 AM
#209
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a few N/A guys before just put a straight pipe in place of the cat and dynoed the car.. they found they lost low end torque.. So your best bet is just buy a DUMP and get it welded in after your cat converter...
I have yet to test this because I am working on the direct cat replacement now.... in the long run I will prolly get the dump welded into the B-pipe and still be able to have some fun.. just not really LOUD open exhaust fun..
I have yet to test this because I am working on the direct cat replacement now.... in the long run I will prolly get the dump welded into the B-pipe and still be able to have some fun.. just not really LOUD open exhaust fun..
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