Cat bypass on a '95
12-30-2009, 06:42 PM
#16
Race Car
^^^^ LMAO, thats funny 
daveHy,
you may want to check your exhaust out to see if you have a leak, you could be sucking air into the system, causing the backfire. Its a strange phenomenon, but is usually the culprit. You might also have an over zealous injector(s) and have to much fuel unburned leaving the exhaust chamber and igniting mid stream.....?
Do you experience strong fuel smells at idle?
daveHy,
you may want to check your exhaust out to see if you have a leak, you could be sucking air into the system, causing the backfire. Its a strange phenomenon, but is usually the culprit. You might also have an over zealous injector(s) and have to much fuel unburned leaving the exhaust chamber and igniting mid stream.....?
Do you experience strong fuel smells at idle?
12-30-2009, 07:38 PM
#17
Addicted Specialist
Rennlist Member
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Thanks for the pics ...nice!
So, curious here, just how much "louder" is "louder" are we talking here? Assume stock everything, but just replacing cat. Thanks!
Edward
So, curious here, just how much "louder" is "louder" are we talking here? Assume stock everything, but just replacing cat. Thanks!
Edward
12-30-2009, 08:44 PM
#18
Race Car
Ed,
With sport cats in a pipe, not much louder at all (hardly noticeable with non motorsound muffs). With bypass pipes, sound levels are louder but still very civil and easily tolerable (conversations without yelling, radio, phone conversations can carry on). The exhaust note is mainly what will change until you open up the mufflers as well, then the sound levels increase quite a bit with either cats/no cats and depending on what is done to the muffs will dictate whether you get outside the realm of civil/tolerable or move into the loud arena.
Our explanations have always been that its not at idle you want the sound, but once you open the motor up is when it should sing. I personally am not a big fan of sounding like a rumbling V8 Mustang when I sit at a light. We all know these aren't the fastest cars and to draw attention by being loud at a standstill is just asking for an embarrasing *** whooping when the little NOS fired Civic blows the doors off your P-car. So we always went for the "top end" sound and its after the motor get to about 4k rpms that our stuff comes alive.. At idle though, the tones are a nice deep low rumble, that doesn't draw attention.
With sport cats in a pipe, not much louder at all (hardly noticeable with non motorsound muffs). With bypass pipes, sound levels are louder but still very civil and easily tolerable (conversations without yelling, radio, phone conversations can carry on). The exhaust note is mainly what will change until you open up the mufflers as well, then the sound levels increase quite a bit with either cats/no cats and depending on what is done to the muffs will dictate whether you get outside the realm of civil/tolerable or move into the loud arena.
Our explanations have always been that its not at idle you want the sound, but once you open the motor up is when it should sing. I personally am not a big fan of sounding like a rumbling V8 Mustang when I sit at a light. We all know these aren't the fastest cars and to draw attention by being loud at a standstill is just asking for an embarrasing *** whooping when the little NOS fired Civic blows the doors off your P-car. So we always went for the "top end" sound and its after the motor get to about 4k rpms that our stuff comes alive.. At idle though, the tones are a nice deep low rumble, that doesn't draw attention.
12-30-2009, 09:53 PM
#19
Racer
Thread Starter
12-30-2009, 10:01 PM
#20
Three Wheelin'
12-30-2009, 10:41 PM
#22
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Hey Chris,
Thanks for that specific answer ...I appreciate that! I just checked out your site ...very nice stuff! Perhaps soon as I recover from a recent slate of spending. BTW, as I had mentioned, I was visiting your site: how would you describe the difference in both the tone and the volume of only the modded mufflers (so all else kept stock) compared to pure stock (ok, with my cheesy drilled airbox
).
Edward
Thanks for that specific answer ...I appreciate that! I just checked out your site ...very nice stuff! Perhaps soon as I recover from a recent slate of spending. BTW, as I had mentioned, I was visiting your site: how would you describe the difference in both the tone and the volume of only the modded mufflers (so all else kept stock) compared to pure stock (ok, with my cheesy drilled airbox
).Edward
12-30-2009, 10:47 PM
#23
Racer
Thread Starter
I just got the DACH installed yesterday, and yes, I have motorsound and Fister III's. It's absolutely beautiful sound. I don't think it's too loud, but it's definitely the lion's growl (GRRRRR!). Very decent sound level (can hear the radio well, but of course, I turned it off since I rather hear the exhaust note)
Falcondrvr: you're welcome to hear it anytime, shoot me a PM with your phone and I'll give you a call next week after I'm back home.
Falcondrvr: you're welcome to hear it anytime, shoot me a PM with your phone and I'll give you a call next week after I'm back home.
12-31-2009, 01:54 AM
#25
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12-31-2009, 03:17 AM
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quote : daveHy,
you may want to check your exhaust out to see if you have a leak, you could be sucking air into the system, causing the backfire. Its a strange phenomenon, but is usually the culprit. You might also have an over zealous injector(s) and have to much fuel unburned leaving the exhaust chamber and igniting mid stream.....?
Do you experience strong fuel smells at idle?
After fitting the bypass the smells are much more noticable but not necessary of feul. Will pull the whole exhuast off, change all the gaskets and try again. If this doesn't work will get the injectors checked. Thanks for your advice
__________________
you may want to check your exhaust out to see if you have a leak, you could be sucking air into the system, causing the backfire. Its a strange phenomenon, but is usually the culprit. You might also have an over zealous injector(s) and have to much fuel unburned leaving the exhaust chamber and igniting mid stream.....?
Do you experience strong fuel smells at idle?
After fitting the bypass the smells are much more noticable but not necessary of feul. Will pull the whole exhuast off, change all the gaskets and try again. If this doesn't work will get the injectors checked. Thanks for your advice
__________________
12-31-2009, 08:36 AM
#27
Race Car
Hey Chris,
Thanks for that specific answer ...I appreciate that! I just checked out your site ...very nice stuff! Perhaps soon as I recover from a recent slate of spending. BTW, as I had mentioned, I was visiting your site: how would you describe the difference in both the tone and the volume of only the modded mufflers (so all else kept stock) compared to pure stock (ok, with my cheesy drilled airbox ).
Edward
Thanks for that specific answer ...I appreciate that! I just checked out your site ...very nice stuff! Perhaps soon as I recover from a recent slate of spending. BTW, as I had mentioned, I was visiting your site: how would you describe the difference in both the tone and the volume of only the modded mufflers (so all else kept stock) compared to pure stock (ok, with my cheesy drilled airbox
).Edward
As for the muffs...
In probably similar fashion to what Darin is doing, we have always dialed in the sound to what the customer wanted (we just never had fancy names for the level I II III
). You tell me what you're looking for, and we make it happen. I can do mild to wild.As for your air box. Once you get to a certain sound level with the other parts, you'll loose the sound of the box (at least from an in the cabin audible standpoint and assuming you followed the factory holes and not just a few large ports drilled into the side).
If it weren't for the eco-*****, the nicest combo (IMO) for street is the bypass with motorsound. Its the old school 911 sound with all the civility of being a 993. Now for track, its an entirely different story, and if you drive hard....the louder the better
Hope that helps.
12-31-2009, 12:31 PM
#28
Rennlist Member
12-31-2009, 12:46 PM
#29
Rennlist Member
I just got the DACH installed yesterday, and yes, I have motorsound and Fister III's. It's absolutely beautiful sound. I don't think it's too loud, but it's definitely the lion's growl (GRRRRR!). Very decent sound level (can hear the radio well, but of course, I turned it off since I rather hear the exhaust note)
Falcondrvr: you're welcome to hear it anytime, shoot me a PM with your phone and I'll give you a call next week after I'm back home.
Falcondrvr: you're welcome to hear it anytime, shoot me a PM with your phone and I'll give you a call next week after I'm back home.
Any chance of a video when you guys get together?
12-31-2009, 01:27 PM
#30
Addicted Specialist
Rennlist Member
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First , you're welcome. Its been a while since anyone has really asked a pointed question so I though it was time to be specific again (old posts are now probably long buried in with all the other chatter)
As for the muffs...
In probably similar fashion to what Darin is doing, we have always dialed in the sound to what the customer wanted (we just never had fancy names for the level I II III ). You tell me what you're looking for, and we make it happen. I can do mild to wild.
As for your air box. Once you get to a certain sound level with the other parts, you'll loose the sound of the box (at least from an in the cabin audible standpoint and assuming you followed the factory holes and not just a few large ports drilled into the side).
If it weren't for the eco-*****, the nicest combo (IMO) for street is the bypass with motorsound. Its the old school 911 sound with all the civility of being a 993. Now for track, its an entirely different story, and if you drive hard....the louder the better
Hope that helps.
As for the muffs...
In probably similar fashion to what Darin is doing, we have always dialed in the sound to what the customer wanted (we just never had fancy names for the level I II III
). You tell me what you're looking for, and we make it happen. I can do mild to wild.As for your air box. Once you get to a certain sound level with the other parts, you'll loose the sound of the box (at least from an in the cabin audible standpoint and assuming you followed the factory holes and not just a few large ports drilled into the side).
If it weren't for the eco-*****, the nicest combo (IMO) for street is the bypass with motorsound. Its the old school 911 sound with all the civility of being a 993. Now for track, its an entirely different story, and if you drive hard....the louder the better
Hope that helps.
Thanks for the details.
Edward