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I used the GESI G-Sport UHO 300 cell cat (this was Vibrant cat, just rebranded) with great success for several years until I recently blew the cat out from a large backfire (ignition issue). I checked it a few times through the years with no melting or problems prior to the backfire. I am going to replace this blown out cat with the newer GESI cat. The newer GESI cats are even better than my old one with a higher melting temperature and a newer s-coil design. This Vibrant cat replaced my old SMB cat, which did melt. I use this cat with an SMB mid muffler and an old Racing Beat (original RS*R) rear muffler. Very nice sound.
Mike
I used the GESI G-Sport UHO 300 cell cat (this was Vibrant cat, just rebranded) with great success for several years until I recently blew the cat out from a large backfire (ignition issue). I checked it a few times through the years with no melting or problems prior to the backfire. I am going to replace this blown out cat with the newer GESI cat. The newer GESI cats are even better than my old one with a higher melting temperature and a newer s-coil design. This Vibrant cat replaced my old SMB cat, which did melt. I use this cat with an SMB mid muffler and an old Racing Beat (original RS*R) rear muffler. Very nice sound.
Mike
Of note, didn't know they were a Canadian company. Left a message for them, guy called me back and talked through the application with me in detail -- seemed to be quite knowledgeable on rotary application and said this was the correct model that has been successfully run on many rotary engines. Gave me his direct line and said to call or text with any questions. Talked to them on Tuesday, ordered on Wednesday, cat shows up Thursday.
So far I'm pretty impressed. The only slight pause I have is the printed note in the box that says "keep this under 1600F"
I assume it's a generic CYA card, but it's weird to see that after getting the greenlight for rotary applications.
Thankfully this is going on a 90mm exhaust, and hopefully by the time it hits the cat, the EGTs are decent. Might add a sensor to keep an eye on it.
1600f = ~870c, should not be a big problem. engine will want to be somewhere in the 900-950c area, and then the turbo takes a bunch of that, and then there is a some distance
if you put an EGT probe on a stock car, which has a ceramic cat with a melting point around 650c, that temps into the cat would peak right around 650c
on an NA car EGT out of the engine was 700c, and i saw 720c max
the stock FD ecu pre turbo was maybe 820c (its been a while).
the chipped FD ecu also pre turbo was closer to 875c
basically once Mazda had to start warranting the converters in 1989 for 7 years or 70k miles, the mixtures got a lot richer to keep EGT in bounds.
