Hello, my names Dominic and I bought a 1988 Mazda RX7 GTU in October and it's in great shape with only 88,000 miles on it!



It's currently receiving little modifications because I love the stock GTU platform. I never knew stock unmodified cars could handle and drive so well. I fell in love with the thing and now I'm learning more about how it works but I'm currently stumped. I'm replacing the catalytic converter with a 2.5" race pipe. On the cat there is a pipe shown in the pic that attaches to the cat. I followed it to the back of the 13B n/a. Is there something that I can do to delete this or should I have something welded to the race pipe? Thanks ahead of time, I appreciate it!

 

That is the Split Air Pipe. It is required to operate the 5th and 6th ports of your engine. See this thread for pictures:
https://www.rx7club.com/new-member-r...r-pipe-798042/

Personally, I would rather bolt the pipe to the new exhaust rather than weld it.

I would recommend that you see the 2Gen FAQ for links to online manuals so that you have a better idea of what you are ripping off your car.
https://www.rx7club.com/2nd-generati...faq-fc-494667/

Also, Racing Beat has a nice tech section. Just click on the subjects on the left side of the screen to flip through the pages.
Rotary Tech Tips: Rotary Engine Exhaust Basics

BTW, the 88 GTU is one of my favorite RX-7s.

 

After reading all that, this needs to get taken care of then. Thanks for the help man.

 

previous owner had my gtu's exhaust gutted, not sure if that's a good idea?

 

Awesome.

 

Nice, welcome!
Use the Archive
Invest in a ton of prevenative maintenance - every little hose and such. Heater hose under the oil filter, and replace the plastic t-stat neck with metal, are 2 of my pet peeves!

Have fun!

 

Just for clarification, the t-stat neck problem is specific to the 89-92 models, and the problem with the heater hose is actually caused when the two o-rings (Part# 9954-10-1601) under the oil filter pedestal fail and leak oil onto the hose.

Whenever I buy a used FC, I always replace the fluids, oil filter pedestal o-rings, thermostat, pulsation damper, fuel and oil filters, and anything that appears to be in poor shape (typically EFI rubber hoses, battery, belts, tires, and window seals). I also like to replace broken 86-88 stereo surrounds with the better 89-92 surround and vents. I like to replace the stupid OEM oil drain plug with a Fumoto oil drain valve, and replace the Philips-head bleeder plug and radiator drain plug with wingnut plugs.

 

Much better list than mine

 

this dude knows his stuff, i cant wait to pick on up!! ill def be using this advice

 

All of this advice is really helpful, really enjoying working on this car