installed muffler lost power???
11-15-2003, 06:38 AM
#1
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installed muffler lost power???
I have an OBX exhaust and replaced the muffler with a Megan dual fireball canister muffler with silencers. The OBX muffler was loud and hung too low for my driveway and the Powertech pt1012 I had after that was too loud. Well, any way had car dynoed and to my suprise when removing the silencers I lost about 20 hp and about 20 tq. and when I put them back in I gained it all back and got about 5-7 up top. What gives? do we need back pressure to make power? Here is linke to dyno http://www.hpphoto.com/servlet/LinkP...613d69a8&size=
11-15-2003, 06:41 AM
#2
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Originally Posted by jerome johnson
I have an OBX exhaust and replaced the muffler with a Megan dual fireball canister muffler with silencers. The OBX muffler was loud and hung too low for my driveway and the Powertech pt1012 I had after that was too loud. Well, any way had car dynoed and to my suprise when removing the silencers I lost about 20 hp and about 20 tq. and when I put them back in I gained it all back and got about 5-7 up top. What gives? do we need back pressure to make power? unlike turbo cars.
CAn you possibly post your dynos. This is extremely interesting.
11-15-2003, 01:59 PM
#7
Originally Posted by jerome johnson
I have an OBX exhaust and replaced the muffler with a Megan dual fireball canister muffler with silencers. The OBX muffler was loud and hung too low for my driveway and the Powertech pt1012 I had after that was too loud. Well, any way had car dynoed and to my suprise when removing the silencers I lost about 20 hp and about 20 tq. and when I put them back in I gained it all back and got about 5-7 up top. What gives? do we need back pressure to make power? unlike turbo cars.
Backpressure has nothing to do with it...backpressure is for 2 stroke engines, not ANY 4 stroke. What you're thinking of is gas velocity...that's what we need.
11-15-2003, 02:01 PM
#8
I don't see how there can be 20hp and tq difference by taking out the silencer. A friend of mine has a 99 SE with a silencer in his muffler and his car is considerably quicker with the silencer out of the muffler... Dyno sheets would be extremely helpful..
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