muffler from a fellow TN member. Everything about it is great but for some reason I feel like I've lost power. It just seems to take more pressure on the pedal. Maybe it's just me but could someone confirm or deny my suspicions?
In order to know for sure, you would have to dyno your car before and after you installed the muffler.
But generally speaking, if the muffler is all that you changed and you left everything else stock, then only the sound would differ. Had you installed a full catback and nothing else, then you would notice a shift in the powerband towards increasing mid-range to high end throttle reponse, but at the expense of low end torque.
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Quote:
Originally Posted by TURBO Das Automagazin
A BRZ, a curvy mountain road makes one liter of happiness hormones.
I recently purchased this muffler from a fellow TN member. Everything about it is great but for some reason I feel like I've lost power. It just seems to take more pressure on the pedal. Maybe it's just me but could someone confirm or deny my suspicions?
if you just put on a muffler than you may have. i used to have a similar muffler on my car, and according to a friends gtech, it got quicker when i took it off. and sounded better too. also dont forget our engines are a high compression engine. so there for it needs as free flowing exhaust system as possible to make power. anything less will be a restriction.
i am currently running with no muffler, stock resonator, and a gutted cat, with a cheap ebay header. and it screams up top. has decent mid to low range too. but we are dealing with a 1.8l engine. low end will not be great by any means unless your supercharged, have a fast spooling turbo, or a 4.56 final drive like me.
So I've noticed a considerable drop in MPG, not the normal fluctuation. I'm not sure how to diagnose the problem.
The only 'mods' I've done to the car are a generic SRI, new spark plugs and wires, and the addition of the magnaflow muffler. I know having the coil pack in the wrong order could cause similar problems but I believe I have it right.
Could the loss of power I feel be related to the suffering MPG as well?
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Last edited by TwoPageAfro; 09-04-2009 at 04:52 PM.
SO after you changed the stock muffler to the Magnaflow muffler you noticed a drop in MPG and power loss? Did you change the spark plugs and wires at the same time as the muffler? Also maybe it could be your SRI considering its pulling in hot engine air.
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Subaru Impreza 2.5i Premium Satin White
So I've noticed a considerable drop in MPG, not the normal fluctuation. I'm not sure how to diagnose the problem.
The only 'mods' I've done to the car are a generic SRI, new spark plugs and wires, and the addition of the magnaflow muffler. I know having the coil pack in the wrong order could cause similar problems but I believe I have it right.
Could the loss of power I feel be related to the suffering MPG as well?
hmm. how many miles on your car? i used to have a cheap muffler on my car, and it felt much quicker when i took it off and just deleted it. my mpg also went up. i would say there is some sort of restriction. maybe your cat is beginning to get clogged. mine got progressively slower and slower as the cat got worse. then after i gutted it it felt like a new car. just make sure to do the MIL eliminator from newcelica.org if you dont want any check engine lights.
SO after you changed the stock muffler to the Magnaflow muffler you noticed a drop in MPG and power loss? Did you change the spark plugs and wires at the same time as the muffler? Also maybe it could be your SRI considering its pulling in hot engine air.
The spark plugs and wires were before the muffler change. I thought the hot air would barely affect it?
Quote:
Originally Posted by Milky
hmm. how many miles on your car? i used to have a cheap muffler on my car, and it felt much quicker when i took it off and just deleted it. my mpg also went up. i would say there is some sort of restriction. maybe your cat is beginning to get clogged. mine got progressively slower and slower as the cat got worse. then after i gutted it it felt like a new car. just make sure to do the MIL eliminator from newcelica.org if you dont want any check engine lights.
What you're experiencing is a loss of exhaust backpressure that can cause loss of low end torque. Corollas come from the factory already near their power and torque peaks and messing with these tight tolerances can result in what you're feeling now. Bigger is not always better.
Since you already have an SRI (increases high end power at the expense of low end torque), the effect is more pronounced and noticeable. This is definitely normal. And what happens a lot of the time when you modify an engine designed for economy.
The only solution now is to do a proper dyno tuning session since your car is most likely lacking sufficient fuel delivery.
But that may result in further loss of fuel economy.
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Quote:
Originally Posted by TURBO Das Automagazin
A BRZ, a curvy mountain road makes one liter of happiness hormones.
What you're experiencing is a loss of exhaust backpressure that can cause loss of low end torque. Corollas come from the factory already near their power and torque peaks and messing with these tight tolerances can result in what you're feeling now. Bigger is not always better.
Since you already have an SRI (increases high end power at the expense of low end torque), the effect is more pronounced and noticeable. This is definitely normal. And what happens a lot of the time when you modify an engine designed for economy.
The only solution now is to do a proper dyno tuning session since your car is most likely lacking sufficient fuel delivery.
But that may result in further loss of fuel economy.
The spark plugs and wires were before the muffler change. I thought the hot air would barely affect it?
it has 55,000 miles on it.
when moving the difference between a cai and sri is neglegable. usually air is forced into the engine bay anyways, so air intake temps are close to the same when in motion.
i wouldnt say it would be because of a loss of backpressure, if the stock cat is still equipt then there should be more than sufficent backpressure to ward off any negetive side effects. you generally only want 3-5psi max backpressure for a naturally asperated car, typically much higher on a forced inducted. you can check this with a engine diagnostic vac/pressure guage. most of the ones come with adapters to measure backpressure before and after the cat via the o2 sensor holes.
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