Super quiet cat-less exhaust... (Atleast going to see)
05-12-08, 07:51 AM
#1
Diamond Cut Seven
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Super quiet cat-less exhaust... (Atleast going to see)
So ordered the parts yesterday and going to see how quiet this badboy can get and how loud it can get on wot.
3 inch stainless steel downpipe
Rx7store mp - modified with an apexi ECV
Racing beat cb DT
I'll let you guys know well it cuts out the droning
3 inch stainless steel downpipe
Rx7store mp - modified with an apexi ECV
Racing beat cb DT
I'll let you guys know well it cuts out the droning
05-12-08, 08:51 AM
#7
Rotary Freak
my plan is to go withna Trust 80mm DP and then splitting up to double 60mm piping through a double 60mm mid silencer running double piping all the way to the back (same setup for tha catback). End tip can still be a single (flat oval) or a double tip.
Key to exhaust tone (or how loud it is) is the frequency of the resonance wave in the exhaust plumbing. The bigger the diameter, the bigger the resonance wave, the louder the exhaust is. People want bigger for more flow.
I'll try and solve that with double 60mm's, flowing more than an single 80mm. Small diameter for a small resonance wave and deep tone.
Still, good luck with your project
Key to exhaust tone (or how loud it is) is the frequency of the resonance wave in the exhaust plumbing. The bigger the diameter, the bigger the resonance wave, the louder the exhaust is. People want bigger for more flow.
I'll try and solve that with double 60mm's, flowing more than an single 80mm. Small diameter for a small resonance wave and deep tone.
Still, good luck with your project
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05-12-08, 09:16 AM
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Diamond Cut Seven
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Key to exhaust tone (or how loud it is) is the frequency of the resonance wave in the exhaust plumbing. The bigger the diameter, the bigger the resonance wave, the louder the exhaust is. People want bigger for more flow.
I'll try and solve that with double 60mm's, flowing more than an single 80mm. Small diameter for a small resonance wave and deep tone.
Still, good luck with your project
I'll try and solve that with double 60mm's, flowing more than an single 80mm. Small diameter for a small resonance wave and deep tone.
Still, good luck with your project
I ordered the 80mm ~ http://cgi.ebay.com/ebaymotors/Apexi...spagenameZWD1V
Btw ~ I made an offer for 140 an was accepted so it was 155 total if anyone is interested
05-12-08, 12:55 PM
#11
I have 3" down pipe, an emptied high flow cat, and a RAcing Beat dual tip on a pretty large street ported motor. It is not loud, you can certainly hear it even at cruise but no droning and not annoying at all. It still can get very noisy at full throttle and thats what really matters!
05-12-08, 01:11 PM
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Diamond Cut Seven
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Yea, I only want to hear it at wot. I have 3 main noise killers in my car.
26lbs of sounds deafening (Q-mat) all on the rear and hatch.
Rx7store MP - custom Apexi 80 mm ECV
Racing beat dual tip
I'm having the ECV put all the way up in the furthest part of the mp so I don't hear the sound reverberate through the cars chassis.
26lbs of sounds deafening (Q-mat) all on the rear and hatch.
Rx7store MP - custom Apexi 80 mm ECV
Racing beat dual tip
I'm having the ECV put all the way up in the furthest part of the mp so I don't hear the sound reverberate through the cars chassis.
05-12-08, 05:17 PM
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¿¿What are pistons??
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Question for you guys, does a resonated midpipe work to keep the odor down? I know midpipes make the car smell like gas but does having the resonator help out?
05-12-08, 08:06 PM
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Diamond Cut Seven
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Either way if I sense droning on the highway = click an the valve snaps shut or 95% if need be.
You only need 18hp to maintain a speed of 60mph in an average weight/not so aerodynamic car, judging by that I'd say the FD can keep pace fine even with that restriction
You only need 18hp to maintain a speed of 60mph in an average weight/not so aerodynamic car, judging by that I'd say the FD can keep pace fine even with that restriction
05-13-08, 04:09 PM
#23
Rotary Freak
point is that at 3 or 3,5 (or 4 if it matters) is just to big of a bore to have a a short resonanting wave. So it will either be loud or very loud, but not what you want.
I had what you are refferint with a HKS downpipe, oem cat and home made catback with 70mm piping and muffler with 70mm throughout piping.
Replacing the oem cat will put you right in the 'loud' group... no matter what.
I had what you are refferint with a HKS downpipe, oem cat and home made catback with 70mm piping and muffler with 70mm throughout piping.
Replacing the oem cat will put you right in the 'loud' group... no matter what.
05-13-08, 08:08 PM
#24
Supra Smasher
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The only thing I would worry about is how all that restriction will effect the tuning. Will you just tune it with the valve open? If you go wot with the valve closed will it be really rich?
