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Old 09-15-2004, 10:39 PM   #1
mattyv8
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Default hp loss with new muffler on an auto???

I just got a new muffler (ractive) and put that on my auto TS wagon and Im loosing HP huge on the low end and my fuel economy is going down big time. It backfires all the time now too. Is it even worth it to have something other then stock exhaust on the Automatic wagon? Would a silencer bring back some backpressure to create more torque at slow speeds? Im starting to hate the automatic.
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Old 09-15-2004, 10:41 PM   #2
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might wanna try an ECU reset first...but in my experience, mufflers alone don't do much if anything at all...better to get all the piping redone.
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Old 09-16-2004, 12:19 AM   #3
piker28
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what size piping? is this a full catback or just muffler? our cars are known to backfire, my friends does everytime he blips the throttle and shifts gears hah its funny

and yes i say try a ecu reset, since its flowing differently
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Old 09-16-2004, 12:27 AM   #4
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I 3rd the motion to reset your ECU. And like fibuz said, mufflers don't really give you that much of a gain.
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Old 09-16-2004, 12:30 AM   #5
Matt
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One of my wagons is an automatic -- 2002 Outback Sport. I've got a WRX center pipe and rear muffler with the flange turned on the center pipe. The sound is quiet and it does help performance quite a bit. The car ran a little strange when I first put it on, but it did improve after about a week. Your results are a little peculiar, I'd try the usual disconnecting of the battery for an hour or two, then try again. The cars with the 4EAT seem to take a little longer to learn new habits and changes with the intake and exhaust. Just try a reset and be patient.
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Old 09-16-2004, 10:15 AM   #6
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Quote:
Originally Posted by mattyv8
I just got a new muffler (ractive) and put that on my auto TS wagon and Im loosing HP huge on the low end and my fuel economy is going down big time. It backfires all the time now too. Is it even worth it to have something other then stock exhaust on the Automatic wagon? Would a silencer bring back some backpressure to create more torque at slow speeds? Im starting to hate the automatic.
1) The name 'Ractive' should have been your first clue that you were making a mistake. Ractive isn't exactly known for tuning their parts.. just for making lots of cheap parts.

2) 'Backpressure = Good' is an old hot-rodder's misconception. Backpressure is never good. What you want is to optimize exhaust flow. By placing a free flowing (Ractive piece-of-crap) muffler on the end of the system you're optimizing the high RPM exhaust flow and fowling up the smooth low RPM exhaust flow of the stock system.

3) Automatics don't allow engines to spend much time in the upper RPM range. The gears are too widely spaced and the electronics are too eager to upshift. If you were driving a manual, you might be able to extract whatever minor power bump the (Ractive piece-of-crap) muffler provides.. but it would still be a pain for daily driving.

4) Exhaust tuning on a Naturally Aspirated engine is a fine art. Usually you need a properly tuned performance exhaust from headers to high flow cat to mandrel bent tubing to a properly sized muffler in order to get meaningful gains. A turbocharged engine is happiest with as little exhaust piping as possible after the turbo. Don't confuse the results of the turbocharged community with the N/A community.

We all make tuning mistakes like this when we start out. Put your stock muffler back on and use the boards to research some more meaningful mods.
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Old 09-16-2004, 11:45 AM   #7
mattyv8
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thanks for the help, I knew buying anything from Canadian tire was a mistake. I think the guys that put my ractive muffler on threw out my original one...arghhh
Im learning...im going to try and see if using a silenser helps at all.
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Old 09-16-2004, 03:27 PM   #8
foamingskwerl
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If it's a catback, is it possible that your cat could be somehow obstructed on the outlet side? Backfiring and loss of power sounds like a bad or plugged cat. Is your car running a little hot? Does it smell funky?
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Old 09-16-2004, 03:34 PM   #9
Undepelo
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There might be packaging material inside the muffler itself...Check that out..
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Old 09-16-2004, 03:36 PM   #10
Calamity Jesus
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Is the backfiring like single loud bangs.. or just lots of little pops when coasting?
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Old 09-17-2004, 09:41 AM   #11
mattyv8
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singles scattered pops while coasting and when it downshifts....
THeres no packaging, its all clear. I got a silenser on it now and it made a bit more backpressure, not much though. NOw it sounds like a dry throat wind sound. Im really screwing myself over here. Im still working on it though. Went to the suby dealer and they wanted $500 for a muffler they said would work well. Arghh...!!
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Old 09-17-2004, 12:20 PM   #12
piker28
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just go buy a whole stromung catback for 500 it works well sounds good yada yada
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Old 09-17-2004, 12:44 PM   #13
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You mention Canadian Tire - whereabouts in Canada are you? I'm sure there are loads of N/A guys who have aftermarket zorsts near you - you should be able to pick up a used OEM muffler locally for cheap. Even one just to swap on to isolate the problem.
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