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header installation help!!

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Old 03-24-03, 08:00 PM
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header installation help!!

ok well i started at about 11am today, and im just now done cleaning everything up and ready to take a shower (5:30pm ish), i had NO help...did it all myself. however if you know where to look/what to do, it will take much less than HALF that! i was clueless, i didnt know where to start, but eventually after a couple bruised knuckles and small cuts, its DONE!!

so yeah i was supposed to be getting a A'PEXi N1 universal muffler from a friend today, but it turns out they didnt have it in stock so they have to pick it up from A'PEXi tomorrow and then im supposed to get it thursday, its ok i can wait i guess. BUT oh boy does my car sound like a BEAST now!!! it sounds like a harley x3, super loud like a straight race car! muahaha

but anyways i have some questions for people who can help me out here....

1. the the little metal tube that would normally hook up to a RB pre-silencer for N/A's that has a back pressure sensing tube ... i have nowhere to put that, where am i supposed to hook that up to? do i take if off? or is that where the new little tube from the header come into play? i dunno...

2. i have the Mazdatrix modified Road Race header, they welded a bung on the pipe with a small tube coming out of it for the 5th & 6th port actuation....but where does that hook up to? i got a small silicon hose it came with but i dont know where to hook it up to....

can anyone please help? sorry the explanations arent very great but if anyone who has any idea of what im talking about, should know what im talking about and be able to help me..
Old 03-24-03, 08:08 PM
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1) Did you block off your ACV? Im assuming NO since you still have that tube. If you have no cat to put it no, I think you can just cap it.
2)Im not 100% sure without seeing a pic of what your talking about, but I think there is also a small tube coming off the split air tube that this hooks up to.
Old 03-24-03, 08:18 PM
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that silicone hose they gave you should go to the nipple on the header, and then the other end should go onto a nipple that is below and to the left of the rear 6 port actuator. there should be a small diameter nipple that sticks out from the engine about 2" if i recall correctly. The exhaust should provide you the pressure to activate the 6 port induction. once you get it hooked up, youll have to work the throttle by hand, to the point that the actuators open the 6PI, and have someone sit in the car to tell you the RPM. youll need the actuators to...Actuate at about 4000, the same time the secondary injectors turn on. If they dont open at 4000 w/ the tube hooked straight up. youll need a metal fish tank air diverter valve and extra hose. run the hose from the exhaust to one end of the fish tank air manifold valve thing, and then a 2nd hose from the valve thing to the nipple on the engine. then have your friend hold the throttle at 4000 rpms, exactly. then, open up the valve on the fish tank valve to bleed off air pressure so that the actuators open at 4000.

if you dont have enough back pressure in the exhaust to begin with, youll need some other air pressure source, probably the AIR pump. tap into the 5/8" hose coming from the back of the AIR pump and run that small vaccum hose to the fish tank valve, rathe than using the hose from the header. that will definitly supply you w/ enough air pressure.

i hope that helps.
Old 03-24-03, 08:45 PM
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ok since im not gonna have any cats on it, im gonna take off all un necessary emmisions = air pump/acv/etc. ok as for the nipple the hose should go on, its not a nipple, its a small L shaped metal tube about one foot long, maybe a little more....and then about the actuator, me being the noob i am, dont know what it looks like...so i have no idea on where to look...
Old 03-25-03, 01:43 PM
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nm, i found them, and hooked up the tube, now i just need to buy some blockoff plates and take out the airpump and acv....thanks guys!
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