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High flo cat to make car livable?

Old 12-18-18, 02:29 PM
Hi sir
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Originally Posted by Sgtblue View Post
OP, what caused your engine failure?
Not sure yet. Motor is still in the car. I'm trying a good MMO soak first to see if I can correct a stuck seal. It's idles fairly well and runs fine but starts hard and you can hear a miss at idle. I don't drive it very often so I'm crossing my fingers for a stuck seal or carbon crud somewhere. Compression test after the de-cruding. I'll have to have it taken apart if this doesn't cure the issue.
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Old 12-18-18, 02:47 PM
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Originally Posted by Tom93R1 View Post
opening up exhaust will get the turbo spooling faster. Really, the best exhaust after the turbo is probably no exhaust, but you of course couldn't drive that without catching stuff on fire.
Or without going deaf...
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Old 12-25-18, 05:05 PM
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Abbreviated version of my post (I'm an idiot and clicked the wrong button and deleted my previous long form reply....).

I have a single turbo, aftermarket ecu car w/ OMP and premix .5oz/gallon. I live in west LA (green juice capital) so I have to run a cat or else risk getting harasses by swarms of priuses, plus I hate smelling like a gas station after driving the car.

I've blown out both magnaflow and Bonez cats. I think mostly due to crap tuning on the car, but still question whether they'd last very long on a high hp single turbo car. They're ceramic cats so a couple solid back fires and they'll start to crack apart.
Currently have a Vibrant GESI metallic cat and so far it's been great. Newly installed single turbo setup and much better turn on the car to help it along. Very little smell at idle at 13 AFR. Although hard to eliminate back firing completely. ie i run ign cut at rev limit as it's safer for the engine. I also run a quick fuel cut on decel to preserve the cat. If you want to shoot fire like youtubers/instagrammer, forget running a cat, you're wasting money.

From my research german cat brand HJS makes the highest end cats. They're used by german OEMs and in some supercar after market parts. They make a motorsports 100 cell line which is prob perfect for rx7s. Down side is they're 2x the cost of the GESI cat. Fabspeed sells them in the US. $900 (just the cat) for the ideal one for the rx7.

High end cats have much higher content of catalytic previous metals than cheap ones. This makes them more effective at reducing emissions. Hard to know the previous metal content of each aftermarket cat but I'd guess that a OEM level cat like the HJS would be much better than the magnaflow which costs <$200 for just the cat.

Would be great if someone could work up an aftermarket airpump setup for single turbo cars. Some OEM cars have electric air pumps which might be easier to integrate vs the stock mechanical setup.
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Old 12-26-18, 09:49 AM
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HJS Catalyst Summary

^quick & informative writeup of HJS catalyst technology

Last edited by Topolino; 12-26-18 at 09:52 AM.
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