Lesson in restrictive exhausts
Lesson in restrictive exhausts Well, I learned mine today. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
Brought the car in today to do some dyno tuning with LS1 edit.
Dyno: Pruven Performance Dynojet
Here is the setup (stuff that matters):
2000 WS6
ARE Stg II H/C
LS6 Intake
JBA Headers (doooh!)
Flow Master Exhaust (doooh!)
Whisper Lid
Ported TB
LS1 Edit (best mod yet)
1st Run: 349 HP, 348 Tq - Baseline no tuning done
2nd Run: 352 HP, 348 Tq - Pig Rich, tune for leaning
3rd Run: 355 HP, 352 Tq - A/F getting tanked to low 11's CAT protection <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> , timing pulled 1 deg
4th Run: 355 HP, 355 Tq - A/F leaned a bit more, car fell on its face at 5700 rpm.
So, for all those that look to modifying the exhaust last.... Restrictive exhaust, nets restrictive numbers <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
I will be pulling the cats and switching the CAT overtemp feature off in hopes of getting a little more out of this setup.
Brought the car in today to do some dyno tuning with LS1 edit.
Dyno: Pruven Performance Dynojet
Here is the setup (stuff that matters):
2000 WS6
ARE Stg II H/C
LS6 Intake
JBA Headers (doooh!)
Flow Master Exhaust (doooh!)
Whisper Lid
Ported TB
LS1 Edit (best mod yet)
1st Run: 349 HP, 348 Tq - Baseline no tuning done
2nd Run: 352 HP, 348 Tq - Pig Rich, tune for leaning
3rd Run: 355 HP, 352 Tq - A/F getting tanked to low 11's CAT protection <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> , timing pulled 1 deg
4th Run: 355 HP, 355 Tq - A/F leaned a bit more, car fell on its face at 5700 rpm.
So, for all those that look to modifying the exhaust last.... Restrictive exhaust, nets restrictive numbers <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
I will be pulling the cats and switching the CAT overtemp feature off in hopes of getting a little more out of this setup.
On The Tree
Joined: Aug 2002
Posts: 165
Likes: 0
From: St. Louis, MO
Re: Lesson in restrictive exhausts I guess you could lose the Flowmaster and go with the Loudmouth...but then again, why would you want your car to sound like some old beater pickup truck with glasspacks?
TECH Enthusiast
Joined: Aug 2002
Posts: 612
Likes: 0
From: Northside Rocktown, AR
Re: Lesson in restrictive exhausts <img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" /> I have a LoudMouth on my 99Z and it sounds pretty damn good, nowhere NEAR a beatup pos truck <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />
12 Second Club
Joined: Apr 2002
Posts: 680
Likes: 0
From: Cave Creek, AZ- Canada Also.
Re: Lesson in restrictive exhausts </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by cobray:
<strong>A cutout will make it sound like a POS truck with glasspacks. The Loudmouth sounds better than open cutouts for sure.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"><img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
<strong>A cutout will make it sound like a POS truck with glasspacks. The Loudmouth sounds better than open cutouts for sure.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"><img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
