6 port cat delete
#1
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6 port cat delete
The other day after working on my 88GXL, i sat it back down off the lift and started it to let it warm up (cold that day) and after a bit, i notice a bit of smoke from under the car. Turns out the cat was glowing bright orange.
I imagin its atleast partly clogged, do im just going to get rid of it. My understanding is that the pipe comming off the cat suplies the pressure for the 5 and 6 ports to open. Can i just weld a bung on the side to attach the pipe , or does it need a bend on the inside to be in the exhaust stream.
Also, the air pump was deleted by a prevous owner, so im sure thats not helping the cat either.
I imagin its atleast partly clogged, do im just going to get rid of it. My understanding is that the pipe comming off the cat suplies the pressure for the 5 and 6 ports to open. Can i just weld a bung on the side to attach the pipe , or does it need a bend on the inside to be in the exhaust stream.
Also, the air pump was deleted by a prevous owner, so im sure thats not helping the cat either.
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oh it may have been doing this for a while and i just never noticed... ive only put like 100 miles on it since i got it. I toped off the transmission (input shaft deal leaks) and i was trying to find where my PS fluid was leaking from. Not that it matters, but i work at shop that lets you pull in your own cars on the weekend, so it was on a 2 post lift.
#4
Sharp Claws
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well i would inspect the cat and see if it is truly clogged or broken up internally. if it isn't then you likely have other issues that need to be resolved. you would need a baffle in the exhaust to recreate the backpressure needed for the auxiliary ports. RB makes a presilencer that can do this, others have plumbed into the ACV ports to take the air pump pressure to activate them instead.
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#9
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i dont really need the cat though, right? as long as i can get the pipe for the intake right i wouldnt think it would matter. There is no emmitions testing here, and im going to be using it for autocross and maybe everyonce in a while on a weekend, so noise doesnt matter
#14
Sharp Claws
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every exhaust is gonna be different. no answer i give you is going to be 100% accurate without a way of measuring your backpressure, whether or not you use the split air pipe or not with the smog pump. you're altering the system and there is no definitive answer for what is the best method of hacking it, depending on what parts you use. search what other people have done and test the system after making your alterations to see whether they are opening fully or not.
i'm not a n/a guru, never messed with one extensively(only owned one and not for that long, kept it stock) but i do not mean to sound unhelpful as you are actually trying to keep the ports functioning which is more than most people bother to do.
i'm not a n/a guru, never messed with one extensively(only owned one and not for that long, kept it stock) but i do not mean to sound unhelpful as you are actually trying to keep the ports functioning which is more than most people bother to do.
Last edited by RotaryEvolution; 11-05-15 at 06:13 PM.
#16
Sharp Claws
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here, just read through this thread for ideas. there's dozens of other threads but most any will give you ideas on how to go about it:
https://www.rx7club.com/2nd-generati...k-s4-n-999348/
https://www.rx7club.com/2nd-generati...k-s4-n-999348/
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#24
Red Pill Dealer
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4X4 truck air locking diff pump? I think a a pressure reservoir (tank, if you will) with a regulated output would be perfect. A pressure cut-off switch for the pump and you won't have it running every time you get to 3800 RPM.