Question for people with high flow cat. Sound related.
05-14-2011, 11:43 AM
#1
I don't "smell good".
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Question for people with high flow cat. Sound related.
I searched but could not find a similar experience....
Ok so I'm not new to the world of RX-8 with exhausts and such. I'm on my thrid RX-8 and it has the same exhaust setup as my previsou two. OBX exhaust and High flow cat.
The only change was I went with a RX7store cat vs. the RP Supercat I've used on the other the other two. So I just installed it and took it on a test drive. At about 4k rpms I get a woosh sound, almost sounds like a turbo spooling up to be honest. I use brand new OEM gaskets as usual and made sure all was tight. Rechecked after the drive. All was tight. I took it on the interstate and drove by the wall to get an echo, under 4k rpm under load there is ZERO sound of a leak but at 4k rpm I just get the loud woosh.
I'm not complaining. It doesn't sound bad. Just wondering if anyone else has experienced this. I'm thinking it's probably just how that cat/pipe sounds as the others I used didn't make this sound. It honestly sounds like a large turbo spooling or a large amount of air being pushed.
Ok so I'm not new to the world of RX-8 with exhausts and such. I'm on my thrid RX-8 and it has the same exhaust setup as my previsou two. OBX exhaust and High flow cat.
The only change was I went with a RX7store cat vs. the RP Supercat I've used on the other the other two. So I just installed it and took it on a test drive. At about 4k rpms I get a woosh sound, almost sounds like a turbo spooling up to be honest. I use brand new OEM gaskets as usual and made sure all was tight. Rechecked after the drive. All was tight. I took it on the interstate and drove by the wall to get an echo, under 4k rpm under load there is ZERO sound of a leak but at 4k rpm I just get the loud woosh.
I'm not complaining. It doesn't sound bad. Just wondering if anyone else has experienced this. I'm thinking it's probably just how that cat/pipe sounds as the others I used didn't make this sound. It honestly sounds like a large turbo spooling or a large amount of air being pushed.
05-14-2011, 03:55 PM
#2
I don't "smell good".
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Answered my own question. It's the resonance chamber on my OBX exhaust killing the rasp. Turns it into a "whoosh" sound. Also I put about 30 miles on the car since and now that it's broken in some that noise has quieted down a lot. Kind of a shame, sounded cool.
05-14-2011, 05:19 PM
#4
I don't "smell good".
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Love the OBX. I've been a cheerleader for that exhaust on this site for years. I mean it IS an ebay exhaust but it's a decent quality one. It's a Fujitsubo knock off and sounds VERY close to it. The little resonance chamber really works. I still get a HINT of rasp with the new high flow cat but compared to other RX-8s I've heard with mid-pipes/high flow cats and other exhausts it's like night and day.
The OBX is fairly quiet though as exhausts go. Just a slight bit louder than stock, which is what I was looking for.
The OBX is fairly quiet though as exhausts go. Just a slight bit louder than stock, which is what I was looking for.
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