Lost low end power after Flowmaster install!!

[snatch]

I just installed a flowmaster muffler(80 series) and hooker dual/dual slash cut tips and it seems my car lost some low end power. What the HELL is the deal.
When I accelerate(3/4 throttle) the car just sits their and doesnt down shift and take of anymore. Its really pissing me off, could it be that the 2.5" pipes extending from the muffler to the tips are not mandrel bent, causing some blockage? Im lost and irritated, any help would great.
Thanks Shane

[fbird]

i just got a full exhaust w/flowmaster 80 series (sig. gives discription of my exhaust) but anyway i feel a loss in low end torquw as well

[snatch]

also is their a way to stop the tail pipes from swaying back and forth.
Thanks
Shane

[Arctc Wolf]

tighter rubber bushings will stop the swaying. my stock bushings were way too soft, so they put on smaller, harder ones. b4 u go trippin out about a power loss, go get it dyno'd. the "feeling of lost power" might just be the exhaust actually working the way it should when it isn't restrictive. stock exhaust makes torque top out at mid-range, making it feel like it's getting up to speed quick. free-flowing exhaust makes u keep gaining power up to redline, so u don't feel the torque ever top out. I betchas ur faster, and u just don't feel it.

[camaro_speedemon]

<blockquote>quote:</font><hr>Originally posted by Arctc Wolf:
tighter rubber bushings will stop the swaying. my stock bushings were way too soft, so they put on smaller, harder ones. b4 u go trippin out about a power loss, go get it dyno'd. the "feeling of lost power" might just be the exhaust actually working the way it should when it isn't restrictive. stock exhaust makes torque top out at mid-range, making it feel like it's getting up to speed quick. free-flowing exhaust makes u keep gaining power up to redline, so u don't feel the torque ever top out. I betchas ur faster, and u just don't feel it.<hr></blockquote>

Exactly. You loose low end power with free-er flowing exhaust. But you gain it in the top end. In racing, you in low RPMs only when you launch, the rest of the time you're in the upper RPM range.

[Bliggida]

You don't lose or gain anything with just a muffler.

Let alone a difference noteable enough to feel. Congratulations you psyched yourself out.

[satellite98]

You don't have an exhaust leak, do you? Every time I've had one (and one way you can tell, I think, is it sounds like a paper-or a slithery-sound inside the tailpipes while your accelatoring in low rpms) and can notice a loss in low end. But then I'll tighten everything up, sound goes away and my low end is back....gradually it'll loosen up..

damn my car. I need to get mine welded, or Duct taped.

[snatch]

Listen, not to sound like an A$$ here, but you dont need to talk to me like Im an idiot. I know how my car was, and now I know how my car is, and it feels like a dog. I cant even break rubber with it in second when slamming it! It shouldn't be that noticeable after just putting a muffler on.
I dont mind to listen to advice but their is just no reason to put things in bold like you are yelling at me for asking a simple question.
Anyway, my muffler is welded on. I will have to listen closer to the sound you are refering to. Thanks Shane
Oh I was wondering where you could purchase those stiffer rubber bushings from?

[Arctc Wolf]

our cam's are set up for more of a low rpm powerband. we have small duration, small lift, and wide lobe separation. this improves VE at low rpm's, and holds the car back at high rpm's. doing intake mods will help u out all across the powerband, and make u think u gained a lot of low-end back, and improve throttle response.

[snatch]

Hey thanks Artic, well I just went down to check out the sound that was mentioned in earlier posts, and I hear a hiss like air being let out of a tire just not as loud, is this an exhaust leak.
I had my friend press down on the gas and hold it to about 12-1300 rpm and felt all around the pipes but I didnt feel any air. Any suggestions
Thanks Shane

[jamie]

as bliggida said, you won't feel much, if anything from a muffler change. maybe the mechanic sabotaged your car.

[95slowcar]

I had the same thing happen with my 98 3.8 mustang. (Dual 40 Series Flows.) At first I thought it was bad, but after I raced a few people, I started to notice that the top end gains helped me win more races. Dont hate your exhaust setup quite yet , go race a few times and see how it works out. [img]graemlins/burnout.gif[/img]

[Bliggida]

Talking to you like you're an idiot, or am I stating a fact. You don't have big power output to begin with. So modifications are not going to be as beneficial as if you had 1000 horsepower. A muffler swap could yeild you over 50 horsepower. But with just 200, the gain is so minimal it would hardly show up on a dyno.

The most high flowing unit of an exhaust that will gain you the most power will probably be a header swap. Hot Rod Magazine just dyno tested a set of JBA headers on a 4.6L Mustang, and revealed a gain of about 9 horespower, and 8.5 ft-lbs of torque. A bigger motor than what you've got, and more hp/ci than what you've got. Both of those mean that engine will make more power than yours given the same modifications. If a V8 Mustang made 9 horses, you can expect half to maybe 3/4's that on your V6. So maybe 4-7 hp, IF you did headers, a muffler won't be even half as effective. And I remind you that even 10 horsepower gained at the wheels will be difficult to detect, even for a finely tuned mechanic!!!

Now if you went from stock to completely wild. Headers, 3" madrel bent pipe, high flow cat., and a high flowing cat-back. system. You will have made enough power to detect in your seat. But not with a muffler.

I installed a muffler (only) on my car too and noticed absolutely no difference myself.
Compared to when I installed a 3.42 gear set, from 3.23's (with posi) I could feel only a slight difference...and gears actually multiply engine torque put to the ground. Barely noticeable, and you're trying to state that your muffler made so much difference you could feel the same as what yielded me over 20 horsepower in effective gains with a gear swap?

No where did I insult your intelligence. I merely stated some facts.
If you don't want to believe me, go take your car to a dyno. Assuming you pulled a 160HP base line, if you pulled 161 with you muffler, I'd be happy and pat yourself on the back. And then ask the dyno guys how much RWHP it takes to notice a difference. You're about 9 horses short, if you are as sensitive to change (as I am)

Just trying to help so you don't go out Friday nights and start talking about why you lost a race was because of your new muffler and have people laugh at you in your face. But hey, believe what you want to, even if it ain't the truth.

[ August 08, 2003: Message edited by: Bliggida ]</p>

[Tyler]

re you sure your ac wasnt on?

you wont notice any gains/loss from just a muffler....


maybe u just need a tune up

[95slowcar]

Did the muffler shop enlarge any piping when they installed your muffler?