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Old 02-02-2010, 11:35 AM   #1 (permalink)
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Anyone experience power loss w/ exhaust mod?

I retained all the stock piping, but basically swapped out stock muffler for a Flowmaster 50 SUV muffler. 2.25" in dual, 3" out single.

I don't know if It's in my head, but it feels like I lost power.. butt dyno throwing me off here.

Would a power loss make sense here of does my butt dyno require calibration.
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Old 02-02-2010, 11:53 AM   #2 (permalink)
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yeah u'll lose a little bottom end
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Old 02-02-2010, 12:17 PM   #3 (permalink)
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How can I fix this aside from welding stock system back up? Would resetting ECM make a difference?
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Old 02-02-2010, 12:37 PM   #4 (permalink)
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you should always disconnect the battery for 13 minutes before a mod of this type.
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Old 02-02-2010, 02:29 PM   #5 (permalink)
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Quote:
Originally Posted by Silver09 View Post
I retained all the stock piping, but basically swapped out stock muffler for a Flowmaster 50 SUV muffler. 2.25" in dual, 3" out single.

I don't know if It's in my head, but it feels like I lost power.. butt dyno throwing me off here.

Would a power loss make sense here of does my butt dyno require calibration.
About a month ago I installed the Edelbrock muffler (DI/SO) you were asking about in your other thread. Like you, I had it welded in place and kept the stock pipes. I also noticed a decrease in bottom end power. Not a huge difference, but noticeable nonetheless. After running two tanks of fuel through it it seems to have returned close to normal. I may have just gotten used to the new muffler though. Have you noticed that it will hold gears a little longer? I swear it holds gears 2,3, and 4 longer with the new muffler. I wonder if that gives the sensation of being slower? Either way, I'm beginning to think these trucks do not respond to most mods like my old Silverado did. These trucks are so well dialed in from the factory that I don't think anything short of a S/C is gonna improve performance. In fact, I think you may decrease it some, at least low-end power.
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Old 02-02-2010, 02:35 PM   #6 (permalink)
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i lost a little in the low end
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Old 02-02-2010, 02:46 PM   #7 (permalink)
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Quote:
Originally Posted by 1stYoda View Post
About a month ago I installed the Edelbrock muffler (DI/SO) you were asking about in your other thread. Like you, I had it welded in place and kept the stock pipes. I also noticed a decrease in bottom end power. Not a huge difference, but noticeable nonetheless. After running two tanks of fuel through it it seems to have returned close to normal. I may have just gotten used to the new muffler though. Have you noticed that it will hold gears a little longer? I swear it holds gears 2,3, and 4 longer with the new muffler. I wonder if that gives the sensation of being slower? Either way, I'm beginning to think these trucks do not respond to most mods like my old Silverado did. These trucks are so well dialed in from the factory that I don't think anything short of a S/C is gonna improve performance. In fact, I think you may decrease it some, at least low-end power.
I agree and would say short of a custom tuned full exhaust system, most people (whether they want to admit it or not) install exhausts for the sound more than anything. I bought a JBA exhaust for my old Tacoma. It only lasted 15 minutes before I ripped it out and put the stock back on. No noticeable power increase (prob decrease in low end) and sounded like crap (bad drone). Granted it was only a 4.0L v6 but These Toyota engines seem pretty well tuned from the factory. Like you said a S/C would be the biggest upgrade.

I'll probably just save my self the money a just buy the silver exhaust tip for my Tundra. Not a big-sound guy.
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Old 02-02-2010, 03:04 PM   #8 (permalink)
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I agree and would say short of a custom tuned full exhaust system, most people (whether they want to admit it or not) install exhausts for the sound more than anything. I bought a JBA exhaust for my old Tacoma. It only lasted 15 minutes before I ripped it out and put the stock back on. No noticeable power increase (prob decrease in low end) and sounded like crap (bad drone). Granted it was only a 4.0L v6 but These Toyota engines seem pretty well tuned from the factory. Like you said a S/C would be the biggest upgrade.

I'll probably just save my self the money a just buy the silver exhaust tip for my Tundra. Not a big-sound guy.
You're right, I installed mine purely for the sound. It definitely sounds great, like a V8 should imho, without being obnoxious. For me, the small trade-off is worth it, barely. I purposely went with a dual in/single out and kept the stock pipes so as to minimize low-end losses. That is why I am very skeptical when someone says they gained anything on these trucks with simple bolt-on mods. Maybe at 5500 rpm which I see maybe once a week.
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Old 02-02-2010, 04:05 PM   #9 (permalink)
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I'm going to do an ECM reset and we'll see what happens. If I can't seem to get that low end power back I'm going to find a TRD muffler or something. I'd rather keep the low end and have a quiet truck.
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Old 02-02-2010, 06:05 PM   #10 (permalink)
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Factory Correct...

I believe your VERY close to being right about Tundra's being "almost" maxed out from the factory and why not??? Why build an excellent truck, engine and drivetrain and restrain it like Ford, Chevy and Dodge do because of government EPA or insurance companies bullshit regulations??? Toyota's building a truck that performs, period. All of us Tundra owners know that as soon as we sit behind the wheel and fire one up. I have a feeling that's what Toyota had in mind when they made their ECU so damn hard to break into...They probably wanted us to leave well enough alone! (That's REALLY hard for me to do).
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Old 02-02-2010, 10:58 PM   #11 (permalink)
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I am not seeing any gain, Not any loss either. Mine sounds good though
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Old 02-03-2010, 01:27 PM   #12 (permalink)
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Interesting.. I wonder what the difference is between Magnaflow and Flowmaster?


Anybody know which exhaust systems out there are actually dyno proven to produce more power and more sound without losing bottom end power?
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Old 02-03-2010, 01:38 PM   #13 (permalink)
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Quote:
Originally Posted by Silver09 View Post
Interesting.. I wonder what the difference is between Magnaflow and Flowmaster?


Anybody know which exhaust systems out there are actually dyno proven to produce more power and more sound without losing bottom end power?
All of the catback manufacturers claim power gains. I had it narrowed down to the Corsa di/so and the Borla duals. Both claim power gains but I decided to go with the Corsa. To be honest, I don't notice any power gain but truck sure sounds good!
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Old 02-03-2010, 02:09 PM   #14 (permalink)
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You are most likely feeling the difference in Torque, Free flowing exhaust usually give the most benefit in the highest rpm range, unlikely you would feel any benefit at low rpms, and you could lose torque feeling like you lost power
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Old 02-03-2010, 02:27 PM   #15 (permalink)
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Thats the thing I kept stock pipes for this reason and I am still feeling a low range loss.

Oh well. I guess it's either put stock back on or pay big bucks for a Corsa/Borla, which I may end up doing eventually.
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