had a lil tube coming from the back of my engine and into the cat on my exhaust. i street typed my car and I cut it off and I don't know what to do with it does it go to get air pump? and is it bad to leave it hanging?

 

You removed the split air pipe. Goes away along with air pump and ACV/aux ports. You should only remove this when you do a full emissions delete, as it delivers fresh air to the cat.

Great for no emissions, bad if you have to pass.

 

how do i remove it completely because i have no cat and dont need emissions anymore. can i just completely remove my air pump?

 

Yes, but you can't remove JUST the air pump.
Is your 7 an S4 or S5?

AFAIK, S4s run the aux ports on exhaust backpressure so it's a little different. Honestly I do S5s. On those, your aux ports are actuated by the air pump and ACV. You will need to remove the aux port sleeves, ACV and get a block off plate before you can remove the air pump. Also, it is highly advisable to get Banzai's dual-sheave alt pulley, as that air pump belt drives the water pump too. You want two belts on that pulley so it doesn't slip, because it will.

Split air pipe does run from the air pump to the cat as a fresh air supply so it will come out with the air pump. If you're not in an emissions regulated area, take it all out, but know that this is a day long project and you will need to do it all, including grab new intake mani gaskets. DO NOT drop **** in your runners. If you drop something in there, just go ahead and pull the engine apart and rebuild it. I use duct tape over the holes to keep that from happening.

 

ok thanks. i have an s5. also is there any write up on this cause im fairly new to rotaries. still learning

 

I am too brother, no worries. Search for one. I was told how to do it so I'm not 100% sure about a writeup, but I'm sure there is one on here, nopistons or something somewhere. For common questions, check out atkins rotary's, mazdatrix's, and rotary ressurection's websites. They each have a plethora of faqs and good information. Also Cam Worth at Pettit will talk to you over the phone if he has time. He's a nice bloke.

 

Every time that you screw with your car without first looking in the service manual to at least have a clue as to what you are doing, Baby Jesus cries.

Foxed.ca - Mazda RX-7 Manuals

 

thanks man 👍

i actually read into it before i messed with anything. i read up on rotaries for 2 weeks before i bought my rx7. i just didnt know there was a lil piece from the air pump going to it.

 

I'll leave it at I agree. I'm not going to start a religious argument about Ishtar on the forums. Lol

 

So when you looked at the diagram of the exhaust system in the manual on page F1-5, what part was labeled #1?

 

just leave it open, if you block it off then the ACV and smog pump will be confused about where the air should be diverted. since you need the smog pump for the auxiliary ports this is probably the best option.

 

That is so ghetto.

 

my straight pipe is ghetto

 

Mine too. Welded up my own expander to a flange for 3" exhaust from my factory precat section. Yikes. I need a header.

 

No, it's "clean"! You can't drift mad quick yo unless you indiscriminately rip **** off your car.

 

Hahah jdm tyte y0!

 

tf 3" though?! mine is only 2" and its loud as ****

 

It's loud but modest. It's a single exit CorkSport turbo exhaust I had laying around. I had nothing behind the precat section before so it's definitely an upgrade. Lol that and the stock precat section and exhaust mani need to go anyway.

 

well mine is dumb loud under acceleration lol. 2" piping and some stock piping

 

but its cool right? the chicks dig it?

 

Mine is too. Hahah. Lots of fire, but again I have no VDI, aux ports, or ACV so it will. It doesn't drone while cruising. I'm definitely ready for a proper exhaust.

 

wtf is vdi and acv? also how did you remove the aux ports? im so lost hahaha

 

VDI is variable dynamic intake; the bottom half of the UIM on an NA. ACV is air control valve; it changes the direction of airflow from the air pump to things like your aux ports and split air, which you have since removed. I can tell you how to remove the aux ports but it's mkre work than just that and I'm not trting to clutter up your thread. You are more than welcome to shoot me a pm and we can discuss it.

 

OP, do everyone a favor and follow the link below. There is a ton of great info in the FAQ and links to download the FSM.

https://www.rx7club.com/2nd-generati...faq-fc-494667/

 

but you did lots of research right? have you figured out how to rev to eleventy-billion rpm yet? im guessing this is why you bought a rotary