bluemunkey1820

The car is a 1988 tubo II

So I failed smog. My readings were, at idle 2695 HC. And at 2500 RPMs its 388 HC. My Co% was 7.71 at idle and 4.05 and 2500 RPMs. So after reading the FAQs I have determined I need new cats. After searching I am having a hard time finding info on stock cats or even a high flow after market cats. If someone could please direct me to a good after market tubro back with cats I would be very grateful. Also I need to know if it's worth it to install an S5 fan on an S4.

Thanks for all of the help,
Blue

jackhild59

iTrader: (7)

Rotary Performance sells bonez cats for the RX7. They are reputed to be specifically designed to survive the rotary exhaust.

http://rx7.com/store/rx7/fcexhaust.html#Turbo2

If you use a complete exhaust from Bonez or anyone else, you need to prepare your car for the boost increase, or you will blow the engine.

Min. need FCD, Port the wastegate, increase fuel (SAFCII is easy, other possiblities exist).

Please pay attention or you will be starting another 'Wow, it ran like Stink and then it Blew' thread.


Good luck

bluemunkey1820

Ok, thanks I have a SAFCII just sitting around so I will use that. My waste gate was ported by the previous owner along with the s5 rotors.

Now I must ask why if I open up the exhaust will it raise the boost? I'm not playing with the waste gate or anything, sorry if it is a dumb question.

alwayssideways

because the open exhaust causes the boost to raise higher and faster. This is why most high boosting turbo cars run 3in or bigger on exhaust with no cats. Back pressure causes the turbo not to be used at its full potential. I know its not the scientific answer. but basically its the truth.

Mark

bluemunkey1820

ok thanks much

2slw4u

iTrader: (4)

you can also get a half gallon of denatured alcohol pure, make sure you have a little less than half a tank of gas and pour the half gallon in. drive it hard to the emitions testing and you should pass if not dont blame me lol. I just did this on my car and i killed the emitions. so try this and hope it works out for you man.

2slw4u

iTrader: (4)

by killed i mean i passed really well

bluemunkey1820

thanks im goin to try thath if i dount pass with the new cat

2slw4u

iTrader: (4)

make sure you have at least one cat, im in the same boat as you i got mine and it didnt even have a cat it had a wack exhaust setup. but have the cat one and pur in the denatured alcohol pure in you can find in a hardwhare store in the paint isle but dont tell the worker at the hardwear store what your doing with it, thell tell you like youll blow up your engine or some dumb **** like that. well do the alchol and the cat and do what i said and go to the emitions k