RotoHead

I must redo my exhaust from manifold back. What is need is a list of companies that make items for an 85 GS 12A car.

I need the following parts:
Hi flow Cat
Pre Cats
Muffler

Also, if anyone knows of a header that is CARB approved, please clue me in. As always, the cats and muffler must be CARB approved as well.

Thanks for your help,
Chris

gump

Hello, here is the link for a high flow Cat that is CARB approved (whatever that means) for your Rx.

http://www.rx7.com/cgi-local/1catalo...cat=4&part=110

The company is Rotary Performance.

Good Luck

JoseReyes

I used their high flow cat and it will replace your all your original cats....so all you will need is the high flow cat from the manifold to the connecting pipe...

RotoHead

Well, except when you are in California. You still have to get pre-cats on your car. Even if I blow clean on the sniffer I'll fail without my pre-cats.

Viperx7

iTrader: (4)

My suggestion is either Mazdatrix or Racing Beat. Both companies are in CA, so I would think they should be able to help you.

riffraff

none of racing beats exaust systems are street legal in california.
what a lot of people do these days is just bolt some cats in when it comes time to smog, and then take them back out for every day use...

smnc

Another idea I've heard is to gut the two old pre-cats, pull off the housings a weld them into your new header/downpipe.

Rotary-MG

iTrader: (1)

I recently removed and looked at the cats of both an '84 and '85. In both cases the two primary Cats were gutted on there own. I'm positive that no human intervention was involved, but where the material goes is beyond me since the main Cat was intact on both cars. However, in both cars there was a mesh of wire that came from one of the two primaries that ended up in the Main Cat. If you are removing your cats, LOOK thru the front of the Main Cat and pull this mesh out. It has got to be very restrictive.

The primary Cats are required during the visual inspection. They count them usually, so a header will not and never be CARB approved on an RX7, well maybe in about 20 years. Plus, when you remove the stock manifold you are losing the thermolreactor which is designed to burn off unburnt oil and gas that is exiting the exahaust ports. A header will not perform this task nor will the Cats.

Mazdatrix sells the 1st and 2nd Primaries, but they are expensive, and I would recommend that you try to pass smog with your existing primaries (visual inspection) even if they are empty, and get a new main Cat. Catalytic converter technology has improved greatly since the mid 80's. The new space age materials they are using these days perform much better than they did two decades ago. New cars don't require Air pumps, and the primaries are there to help out during the warm up phase on new cars. In the old days the primaries had to do some pre-converting for the Main Cat but today both functions are combined in the main Cat.

Also check out the Random Technologies web site to learn more about Cats and the high flow characteristics.

And I will say it again and again. The new high flow cats are no more restrictive than straight pipe in many cases. So they could possibly flow better than the Racing Beat presilencers. Don't flame me, exhaust turning is complicated stuff. Length of pipe, diameter, number of exhaust pulses over different rev ranges will effect the power output.

Another trick you might try, if you like risk, is to run your tank near empty, pour in one gallon of denatured alcohol, available from Home Depot. Drive around for a little while, then go immediately to the smog test station. My friend did this with his Honduh after he failed his 1st test. The alcohol burns without Hydrocarbons, and he passed the 2nd test, cutting his emissions in half. I don't know of any Rotaries trying this. And I almost bet my friend $100 that it wouldn't work. Finally, after the test fill the tank with some real gas to dillute the alcohol before you burn a seal or something.

Felix Wankel

The thermal reactors were only on the 79-80 cars. Its totally different from the later manifolds.