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10-19-2005, 07:31 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Everytime I have installed a performance exhaust systems on my vehicles, I lose performance - mainly low end torque, throttle response and drivability. No one drives around at 5,000 RPM, and this is where the performance is noticed most.
I need an exhaust system that will increase performance without losing my low end torque. The engine in the Hummer is desgned to provide maximum torque at low RPMs to get this heavy vehicle moving.
I have tried differnt brands on every vehicle that I have had and they all do the same thing. I am fed up.
I odered the Corsa Touring series thinking this will add some additional back pressure over this current Gibson exhaust system.
I regret ever removing my stock exhaust as this thing is very sluggish down in the low RPM ranges since I removed the stock exhaust.
Any ideas guys? I am so tired of this marketing crap. All of their dyno charts so gains about 3200 RPM+, but we normally drive much lower than this.
__________________
H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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10-19-2005, 07:31 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Everytime I have installed a performance exhaust systems on my vehicles, I lose performance - mainly low end torque, throttle response and drivability. No one drives around at 5,000 RPM, and this is where the performance is noticed most.
I need an exhaust system that will increase performance without losing my low end torque. The engine in the Hummer is desgned to provide maximum torque at low RPMs to get this heavy vehicle moving.
I have tried differnt brands on every vehicle that I have had and they all do the same thing. I am fed up.
I odered the Corsa Touring series thinking this will add some additional back pressure over this current Gibson exhaust system.
I regret ever removing my stock exhaust as this thing is very sluggish down in the low RPM ranges since I removed the stock exhaust.
Any ideas guys? I am so tired of this marketing crap. All of their dyno charts so gains about 3200 RPM+, but we normally drive much lower than this.
__________________
H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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10-19-2005, 07:43 PM
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Hummer Messiah
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Join Date: Apr 2003
Location: Virginia Beach
Posts: 37,474
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Always look at low end torque for these big rigs.
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"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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10-19-2005, 07:45 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Can you offer some suggestions as to where to look when looking at exhausts?
__________________
H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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10-19-2005, 07:48 PM
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Hummer Messiah
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Join Date: Apr 2003
Location: Virginia Beach
Posts: 37,474
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by tomp:
Can you offer some suggestions as to where to look when looking at exhausts? </div></BLOCKQUOTE>I have the B&B and love it. I'm sure some other's will post better suggestions.
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"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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10-19-2005, 07:56 PM
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Hummer Authority
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Join Date: Aug 2003
Location: San Antonio
Posts: 1,635
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2 Words:
Magna Flow
or is that 1 word:
Magnaflow
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People Who Annoy Me...NAGGERS
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10-19-2005, 08:02 PM
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Join Date: Nov 2004
Location: On my way to Hummersgonewild!
Posts: 830
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by JamesT:
2 Words:
Magna Flow
or is that 1 word:
Magnaflow </div></BLOCKQUOTE>
1 word:
Supercharger
-Cure low-end torque problems fast.
Everything else is not worth playing with if you want real gains.
__________________
\"I\'ll worry about the splinter in my eye when you worry about the plank in your\'s\"
2 Pissed off dealer mechanics, Origami frame, Convex UCP, 2 Bent cross members, Dented driveshaft, Broken sway bar mounts, misaligned transmission, exhaust leak, Pl
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10-19-2005, 08:35 PM
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Hummer Guru
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Join Date: Nov 2002
Location: Cognito
Posts: 2,155
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XtremeFlow Thunder Chamber! 
http://www.h2performanceparts.com/about_us.htm
and more detailed info at:
http://www.h2fanatic.com/forum/archi....php/t-98.html
Not sure if it does develop the HP figures they advertise, but I can tell you there definitely is an increase. My SUT used to downshift on a certain highway hill every day on my commute. If it didnt downshift it would slowly drop speed. Now it never downshifts and keeps a constant or slightly increasing speed. |
10-19-2005, 09:02 PM
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Join Date: Feb 2005
Location: Vegas
Posts: 1,571
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Dan:
XtremeFlow Thunder Chamber!
</div></BLOCKQUOTE>
Did you do the install?
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\'05 SUT
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10-19-2005, 09:12 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Yes Dan, I talked with Steve over there earlier today. Only thing I don't like is that this is a weld in kit intended to be added to your factory exhaust pipes. The muffler shop through away my factory stuff when I installed this crappy Gibson junk exhaust.
__________________
H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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10-19-2005, 09:19 PM
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Join Date: Feb 2005
Location: Vegas
Posts: 1,571
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tomp answered my question.
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\'05 SUT
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10-19-2005, 10:23 PM
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Join Date: Nov 2003
Location: HIHUMMER =\'s Mrs. Churchie :D
Posts: 1,585
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FLOWMASTER
That Is All
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10-19-2005, 10:46 PM
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Hummer Guru
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Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by tomp:
Everytime I have installed a performance exhaust systems on my vehicles, I lose performance - mainly low end torque, throttle response and drivability. No one drives around at 5,000 RPM, and this is where the performance is noticed most.
I need an exhaust system that will increase performance without losing my low end torque. The engine in the Hummer is desgned to provide maximum torque at low RPMs to get this heavy vehicle moving.
I have tried differnt brands on every vehicle that I have had and they all do the same thing. I am fed up.
I odered the Corsa Touring series thinking this will add some additional back pressure over this current Gibson exhaust system.
I regret ever removing my stock exhaust as this thing is very sluggish down in the low RPM ranges since I removed the stock exhaust.
Any ideas guys? I am so tired of this marketing crap. All of their dyno charts so gains about 3200 RPM+, but we normally drive much lower than this. </div></BLOCKQUOTE>
That is why I am only replacing mufflers this time... not entire systems/catbacks.
Usually I install anything from long tubes to cat backs... I don't want to lose any low end so a muffler is what is going on this time.
Mark
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10-20-2005, 12:41 AM
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Hummer Authority
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Join Date: Apr 2003
Location: Las Vegas
Posts: 1,819
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I have the XtremeFlow also! Luv it! 
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... Teh black won't get you back
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10-20-2005, 10:06 AM
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Hummer Guru
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Join Date: Nov 2002
Location: Cognito
Posts: 2,155
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by rodster:
tomp answered my question. </div></BLOCKQUOTE>
Hey, I have a welder! 
I actually had a hard time finding someone to install it. No one wanted to touch a Hummer.  After about 12 places I found a Midas in a neighboring town to do it. The guy did a nice job. Took his time and made sure all the welds were nice. $130 & took him about 90 minutes. |
10-20-2005, 01:14 PM
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Hummer Veteran
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Join Date: May 2004
Location: Lighthouse Point Florida
Posts: 175
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Do what I did. I had the extreme flow (May have been a bad one) and my performance dropped to zero. It then progressivly got worse and worse until it was scary to drive. Third trip to dealership they found temperature in front of exhaust muffler was off the scale(blockage). It was burning up the sensor. Dealership was nice enough to let me have an old factory setup that they had laying around from anouther exhaust swap out. Never drove better. Remember an exhaust system is almost a quarter of the way to a supercharger. That will be the way I go if I get the performance bug again. Good luck 
__________________
2004 Lux with 6 inch Fabtech with tie rods, 38 inch MT's, 4:88 gears, and some minor engine tweaks.
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10-20-2005, 01:33 PM
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Hummer Guru
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Join Date: Nov 2002
Location: Cognito
Posts: 2,155
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Screeper:
Remember an exhaust system is almost a quarter of the way to a supercharger. That will be the way I go if I get the performance bug again. Good luck </div></BLOCKQUOTE>
You'd pay $1500 for an exhaust?
What did they say it was clogged with? Packing? Catalytic beads? As far as I know XF doesn't use packing in their systems. Sounds very strange..... |
10-20-2005, 02:00 PM
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Join Date: Feb 2005
Location: Vegas
Posts: 1,571
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Dan:
Hey, I have a welder! </div></BLOCKQUOTE>
I don't. 
Been thinking about buying one and learning how but I can think of a dozen or so other places to practice besides the underside of the SUT. Boom.
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\'05 SUT
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10-20-2005, 02:14 PM
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Hummer Guru
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Join Date: Nov 2002
Location: Cognito
Posts: 2,155
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That's why I didn't do it. If I had a lift I definitely would have. Laying on my back and having hot slag dropping on me doesn't sound appealing. 
I bought a small MIG. Its actually a lot of fun! Made my air horn bracket, fixed a broken tool, put together a welder cart, and added some bracing onto the snowblower where it kept bending. |
10-20-2005, 02:15 PM
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Hummer Deity
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Join Date: Feb 2005
Location: In the basement of the Alamo
Posts: 10,855
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Dan:
That's why I didn't do it. If I had a lift I definitely would have. Laying on my back and having hot slag dropping on me doesn't sound appealing.
</div></BLOCKQUOTE>
Damnit! |
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Fed up with these so called performance exhaust systems!
