I was just wondering what kind of radiator fluid should I use for my 87 Rx-7 and how much should I use? And also what is the purpose of the “split air valve?” Do I need it? Thank you

 

50/50 mixture of water and ethylene glycol or coolant. Fill the radiator and reservoir. I have no idea what a split air valve is.

 

Thanks! My bad it's the split air pipe and not split air valve. It's this little pipe that looks like it's coming from the exhaust manifold to the main catback. So i was wondering if i needed it, i've been looking and asking around and no one can tell me what it is. i want to change out my exhaust but first i need to know what that pipe does and if i "REALLY" need it. If you can help that would be great. Thank you.

 

Split air pipe is needed! It is used to open your auxiliary ports on your intake (s4).

Without this pipe, your ports will not open.

 

The pipe going to your exhaust injects air into the catalytic converter. It cools the incoming exhast gases and makes the process more efficient. Without this, your cat will clog a lot faster...

 

The Factory Service Manual can be found in the FAQ For FC thread. It contains all this information and more, and is an essential tool for any sort of service work that needs to be performed on these cars.

Additionally, the Haynes service manual for the 1986 thru 1991 RX-7 (both turbo and NA) can be found at most local auto parts stores or purchased from any good bookstore (ISBN number 1 56392 007 7). It is only about $25 and is a great quick reference for things like this. Not only does it contain most of the information in the FSM condensed into an easy to read format, but it includes full wiring diagrams as well.

These manuals will answer 99% of service related questions for the car and if you intend to do your own repair work, you will need at least one of them. Preferably both, since the FSM is a free download.

 

Thanks. this helped out alot. !!!!

 

split air pipe is not needed to open aux ports...backpressure is the only thing needed

 

The split air pipe feeds the backpressure from the exhaust to the auxillary port valves. No split air pipe........no backpressure.

And if you have emissions testing in Washington, you should have the split air pipe so the converter will work/last.

 

SOOO..... do in need it? can i take it out without risking lack of backpressure and or power? i want to swap it out with an APEXi N1 catback exhaust, and i want to do it myself and not have some one else to change it out for me. (thats boring) I don't think that they has emission testing laws here in Washington. will it hurt my baby in the long run if i take it out is the question i'm trying to find out. Please Help

 

The auxillary ports add 25 horsepower above 4000rpm. A full exhaust adds at most 25 horsepower. So in the end you gain at most nothing. Keep the split air pipe or find an alternate way to provide pressure to your auxillary port actuators. One common way is to tee off the line coming from the air pump. Search the forums for more information.

Backpressure itself is never a good thing. You just need some way to activate the auxillary ports.

 

well f**k I was told something else...my split air pipe came sawed in half!!!!

what if only a high flow (magnaflow) cat is ran??? can i plug in into that?

 

Can i run 2 diffrent Catbacks? keep the stock converter with the split air pipe and fuse the new converter before or after the stock? Will this work? or is it just dumb?