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Registered
Join Date: Oct 2008
Posts: 11
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exhaust raspy
Recently i discovered that my Cat converter has become broken and rattles. So today i decided against replacing it and just to have a straight pipe installed from the down pipe to the muffler. Im not happy with the sound it creates...
 The car is very raspy at anything above 1700 rpm. Is there anything i can do to fix this? Will installing a glasspack / resonator in place of the test pipe get rid of the rasp? Is there any difference between a glasspack or a resonator? If i have to ill weld another cat back on the car, but ive been trying to avoid this. My last question is what size pipe am i looking on on a stock 87 NA I have stock muffler -- 87 944 N/A Thanks! |
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10-17-2008, 10:54 AM
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Join Date: Jun 2006
Location: O.C. CA
Posts: 4,587
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yes - put a cat back in there - the environment will thank you, and they do not restrict the exhaust enough to worry about unless this is a track car, and in fact in many cases causes torque loss when removed
resonators are generally perforated tubes surrounded by packing material, inside a shell - these generally smooth out a tone, but do not generally add much back pressure glass packs are similar, but have louvered tubes instead of perforated ones - these will smooth out the tone more, but at the expense of resistance |
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10-17-2008, 11:42 AM
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Join Date: Oct 2008
Posts: 11
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thank you very much. I decided to do as you say and just to have an good condition old one put back on.
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10-17-2008, 01:40 PM
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yeah if you want there to be no rasp, you will have to either put a glasspack in there or a catalytic converter. i currently have the stock catalytic converter and a flowmaster, and its a little loud but sounds great
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Mike - CFI, A&P Mechanic w/ I.A., Aztec driver at Island Tyme '88 951S - zermatt silber/black - staying stock. purchased in 11-2006 '84 944 - gemini grau/tan+brown - lightly modified. purchased in 11-2001 2021 Tesla Y - to get me to work Last edited by ERAU944; 10-19-2008 at 07:44 PM.. |
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10-17-2008, 05:08 PM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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Quote:
The pipe after the cat I've measured to be about 2.25 in. , but it's probably metric or something... I don't know exactly if it's different in front of the cat, though.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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10-19-2008, 06:07 PM
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Grey car
Turbo
