I was wondering if this pipe was important. It hooks up to the catylitic converter from the Check valve. I removed the catylitic converter inplace of a large cherry bomb glasspack. "no emission check around here". I heard it helps complete the burn in the exaust somehow? Is it bad to run without it hooked up?

 

It feeds air to the cat to help it work and to help keep it from melting down.

 

also. the high exhaust temps the rotary puts out will burn up the glasspack pretty fast. why dont you put the cat back on and stop ******* with **** you dont understand? do some research. weigh the pros and cons and then come to a sensible conclusion.

 

Because catalytic converters suck and I don't want garbage like that on my rx7.

 

glasspacks will burn out. use something else if you don't want a cat

 

Hmmm ok would it be ok to run the cherry bombs one inplace of each muffler since it's farther from the ignition point and run a straight pipe inplace of the cat?

 

..nobody is mentioning that your Auxilary ports(5/6th ports) will not activate anymore if it is an S4..

 

Enlighten me?

 

the spilit air pipe has a couple nice things going for it. first off, its used to supply fresh air to the main converter to clean up the emissions and to cool the converter to prevent it from melting and clogging the exhaust. this is why the air pump is so important on oem exhaust equipped 7's. it supplies the air necessary for that function and uses the acv to direct that air where needed.

the second function that tube has is for the proper actuation of your 5th and 6th ports if you have an N/A. backpressure from the exhaust runs back up that tube and seperates into a smaller tube to supply the backpresure needed to actuate the 5th and 6th ports.

 

+1
only a couple things to add to add, imho i would never use cherrybombs or glasspacks because they tend to melt down in rx7 due to the intense heat they put out, its worth spending the 100? maybe 150? on a race pipe with a split air tube , or just buy a nice hiflow bonez cat with split air pipe that works nicely

and remember all this info is easily covered a bajillion and one threads/posts in search ! https://www.rx7club.com/search.php

 

Thanks for the info guys. Im gonna modify my straightpipe and fit a nozzle on it and hook the split air pipe back up. And yes I do have an N/A. I will end up buying two 3a Racing exuast pipes with 4in ex holes inplace of the mufflers. Or would it be possible to plug the split air pipe with a cap so that it will have backpressure to activate the 5th and 6th port or would it better to just hook it up to the straight pipe?

 

wow... loud AND slow....

gutting out the cat is actually more effective... its a na on stock ports... why make it as loud as a dragster and barely dip into the 15s?

 

Don't bother, it won't do you any good.
It's the cat that needs the air supply and since you don't have one, you don't need/won't benefit from such a hookup.

 

So could I just cap the split air pipe so there's backpressure?

 

yes
or just wire the aux port open all the time
so you can have crappy sub 4k performance but at least you arent slower than before...

 

I think that hooking it back up to the straightpipe would be better than just capping it because it would have atleast some back pressure to active the 5th and 6th ports.

 

take the dump pipe off your air control valve and drill a hole to fit a vacuum barb. then run a hose from your actuators to that and it will open them if you still have your airpump.

as for the cherry bomb. I got one on my T2 with thousands of miles on it. doesn't rattle and with a single borla muffler the car is as quiet as stock. so maybe the people with bad luck were running too lean. I've also had a RB RevII midpipe with 1000 miles on it and **** started rattling around inside.

point is even if either blew out as long as you don't have an exhaust leak... who cares?