IWhat the @#$$#@!

vibe Freak · Post by **vibe Freak** » Fri Oct 12, 2007 10:28 am

Why is the car seem slower with the new muffler. I have a full 2.5 header back exhaust with all magnaflow. When I have the stock rear muffler on the car she is nice and quite and hauls (removed). I put the Dynomax super turbo Hemi muffler and the car falls on its face off the line. I have reset the ecu and the car has instantly more torque with the stock rear muffler. Maybe there is something to back pressure. Also it has happened I am getting old because the car is to LOUD with the new muffler. An input on this would be great.

vibe Freak · Post by **vibe Freak** » Fri Oct 12, 2007 10:44 am

Could some one please close one of these threads

Petrucci914 · Post by **Petrucci914** » Fri Oct 12, 2007 11:45 am

You'll have more back pressure with the stock exhaust, that's for sure. I'd put your new exhaust on and give it a few days to adjust, then make a judgment.

vibe Freak · Post by **vibe Freak** » Fri Oct 12, 2007 1:09 pm

The car flies with the stock rear muffler. I will be waiting for a few days.

AKLGT · Post by **AKLGT** » Sat Oct 13, 2007 5:23 am

can you retune?i know with my set up, if i don't retune for it, it's pulling timing and everything else based on the old set up. with F/I you should be getting much better gains. when i went to a full TBE in August, it probably gave me another 20 whp. it was a substantial difference. not sure how the S/C would be, but i'd imagine it should still give you more power.

vibe Freak · Post by **vibe Freak** » Mon Oct 15, 2007 2:18 am

I am running the TRD piggy back ecu. I am going to try a smaller 2.25 turbo muffler and see what happens today.

drunkenmaxx · Post by **drunkenmaxx** » Thu Oct 18, 2007 10:48 pm

first of all, sounds to me like you got a muffler designed for a V8, i bet that sounds like (removed)!

vibe Freak · Post by **vibe Freak** » Fri Oct 19, 2007 1:18 pm

I think it is to it sounds like a freakin civic

vibe Freak · Post by **vibe Freak** » Sun Oct 28, 2007 2:09 am

Still working on the exhaust. I will keep you guys up to date on the new exhaust....

BobofTheVibe · Post by **BobofTheVibe** » Sun Oct 28, 2007 2:56 am

My guess is there was a drop in back pressure and a loss of torque kinda like when a header is installed for a lot of cars. I know I am agreeing with someone here on this on this thread so far...just cant remember who.

drunkenmaxx · Post by **drunkenmaxx** » Tue Oct 30, 2007 5:36 am

he didn't do a new header, he did 2.5" exhaust that started at the header.

mathteacher'04vibe · Post by **mathteacher'04vibe** » Mon Nov 26, 2007 2:56 am

I lost all back pressure too, when I went with a new exhaust. I have 2.5" stainless from the resonator back into a 1 in, 2 out muffler that is "ricey" loud. I will post pics when I get a chance. Anyway, with the loss of backpressure, my car has NO bottom end whatsoever, but it tries to spin the tires when it comes "on the cam" at about 4 grand:)

engineertwin2 · Post by **engineertwin2** » Mon Nov 26, 2007 3:27 am

My understanding is that loss of low end torque is typical when you reduce back pressure. I haven't studied up on it (but I will now) but I have heard fairly often that back pressure does affect torque throughout.

IWhat the @#$$#@!

IWhat the @#$$#@!

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