Got flowmasters, LOST power.

J

jas142

Founding Member

Feb 11, 2002

1,358

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0

Jul 19, 2004

#1

• Jul 19, 2004

• #1

I've got a 2004 automatic GT with a UPR x pipe. today I had 40 series flows welded in and now it feels like I lost low end power. Top end it seems a little stronger, but it feels like I lost ALOT of low end. I didn't expect ANY power change from mufflers, just sound... but this sucks. Do you think it might be an exhaust leak? should i reset the ecu?

 

Betrayer00GT

Member

Apr 21, 2003

364

0

16

Sacramento, CA

Jul 20, 2004

#2

• Jul 20, 2004

• #2

Oh no, here we go again...




But seriously, I do not see how reseting the ECU could help.

I really think that this is in your head, tho. Sorry, but I do.

 

Teen'93stang5.0

Founding Member

May 26, 2002

3,560

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813

Jul 20, 2004

#3

• Jul 20, 2004

• #3

ditto, you may have lose 2ftlbs or so by reducing backpressure significantly, my o/r h pipe did that and it was noticable only when i changed the mufflers

 

padge

New Member

Apr 20, 2004

61

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0

Saskatoon, SK, Canada

Jul 20, 2004

#4

• Jul 20, 2004

• #4

Hows it sound? I've got Dynomax Ultraflows with an offroad X-pipe, but I'm kinda sick of the sound. They drone a lot around 2000 rpm.. which is weird because its a straight through muffler... How are the flows for droning with the X-pipe?

 

BigHairyMonkey

Founding Member

Jun 18, 2003

411

1

16

Houston (Bellaire) TX

Jul 20, 2004

#5

• Jul 20, 2004

• #5

its in ur brain

 

crazynorwegian

20+ Year Stangneter

Nov 6, 2003

267

0

16

azusa, ca

Jul 20, 2004

#6

• Jul 20, 2004

• #6

when I got my flows welded in, the installed one backwards. I didn't notice it till I got my side exhaust put in.

 

jrc_03_gt

New Member

Jan 1, 2004

786

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Jul 20, 2004

#7

• Jul 20, 2004

• #7

You may have lost low end. I have argued with many people on here that you do loose low end when installing flows and off road pipes. If you know your car and know how it drives you will feel it. I just simply put 4.10 gears in and it runs better than ever and sounds meaner than hell.

 

wms004

Founding Member

Jan 15, 2002

2,864

2

49

Los Angeles

Jul 20, 2004

#8

• Jul 20, 2004

• #8

Teen'93stang5.0 said:

ditto, you may have lose 2ftlbs or so by reducing backpressure significantly, my o/r h pipe did that and it was noticable only when i changed the mufflers

Click to expand...

having a high flowing midpipe with mufflers that have some backpressure is a good combo to have gains in the high end without killing low end in my opinion. It would have less low end power with straight thru mufflers.

 

J

jas142

Founding Member

Feb 11, 2002

1,358

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Jul 20, 2004

#9

• Jul 20, 2004

• #9

padge said:

Hows it sound? I've got Dynomax Ultraflows with an offroad X-pipe, but I'm kinda sick of the sound. They drone a lot around 2000 rpm.. which is weird because its a straight through muffler... How are the flows for droning with the X-pipe?

Click to expand...

I like the sound, although its a little too tinny in overdrive at some speeds/rpms. During acceleration, it sounds nice. The highway drone isn't bad, and I like it

 

Ryan02Stang

Active Member

Jun 17, 2003

1,181

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36

Arlington Heights, Illinois

Jul 20, 2004

#10

• Jul 20, 2004

• #10

Its in your head...

 

kirkyg

Founding Member

Jun 14, 2002

3,568

1

56

Beaumont, TX

Jul 20, 2004

#11

• Jul 20, 2004

• #11

You typically lose a little low end power when reducing backpressure. There shouldn't be much of a change in hp / tq curve if you just change mufflers. However, you might lose some lowend tq if you remove the cats.

kirkyg

 

F

fellamansteve

New Member

May 24, 2004

108

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0

Seattle

Jul 20, 2004

#12

• Jul 20, 2004

• #12

I still have my stock H pipe but I got the AT catback installed last week. It felt to me that someone pulled the cork out of my stang's a$$...the car didn't seem to be nearly as strained in hard acceleration and it seemed like I could run the tach up a lot faster. One thing I did notice is that Saturday it was nice and the air was dry, the car was running awesome...Sunday, it was hot as hell and very humid, the car seemed really bogged down. Weather???

 

kirkyg

Founding Member

Jun 14, 2002

3,568

1

56

Beaumont, TX

Jul 20, 2004

#13

• Jul 20, 2004

• #13

weather affects performance quite a bit from day to day. I love when the first big cold front comes through in the fall and things dry out after the front its like 15 hp just came out of nowhere

kirkyg

 

G

GregGTStang

New Member

Oct 17, 2003

240

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0

Jul 20, 2004

#14

• Jul 20, 2004

• #14

It's not in your head. I ran my car with an o/r H and flowmasters. When I put my stock H back on my 60' time was better. It's no HUGE difference, but a tiny bit.

 

mrvax

Stay thirsty my friends

Founding Member

Nov 29, 1999

5,225

3

79

SN Moderator: Orlando, Fl.

Jul 20, 2004

#15

• Jul 20, 2004

• #15

Bierbelly lost 8rwhp (peak) from having those Flowmasters welded in. Shoot him a PM if you need the dyno specifics.

 

C

Crush

New Member

Jun 7, 2004

30

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0

Jul 20, 2004

#16

• Jul 20, 2004

• #16

they dont call em BLOWmasters for nothing. pffffffffffff