does deleting your muffs improve HP - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

CC Performance · 03-28-2011, 11:34 AM

an engine is an air pump.. remove restrictions and it functions better... more air in more air out more power made
99.99% of the people who do cut outs make more power with them open than closed.... not sure what you guys had going on there but something sounds not right... I've never heard of someone losing power with the cut out open

Camaro21 · 03-28-2011, 11:37 AM

Quote:

Originally Posted by CC Performance

an engine is an air pump.. remove restrictions and it functions better... more air in more air out more power made

KMPrenger · 03-28-2011, 12:33 PM

I've read many times that loosing backpressure can lower your TQ output...but I'm no expert on that subject!

anthonyj9h · 03-28-2011, 12:35 PM

id rather loose backpressure and get that exhaust out of my engine then leave it in there...lil more power in the long run

Demon Hunter · 03-28-2011, 12:50 PM

Back pressure is actually somewhat of a myth. It's all about the velocity of the gas traveling through the exhaust. If you go to big of diameter in pipe, you loose velocity, thus loosing power. I highly doubt cutting off those trash cans would be detrimental to the flow velocity through the exhaust.

anthonyj9h · 03-28-2011, 12:53 PM

have you ever seen one cut open? they are straight through anyway they just weigh alot and have alot of packing

anthonyj9h · 03-28-2011, 12:54 PM

Quote:

Originally Posted by Demon Hunter

Back pressure is actually somewhat of a myth. It's all about the velocity of the gas traveling through the exhaust. If you go to big of diameter in pipe, you loose velocity, thus loosing power. I highly doubt cutting off those trash cans would be detrimental to the flow velocity through the exhaust.

+1 velocity is key

King Nothing · 03-28-2011, 06:19 PM

Quote:

Originally Posted by RickRay

We dynoed a 2SS with cutouts before and after and you do loose a lot of HP when cutouts are opened....

i hope your kidding

CamaroDreams07 · 03-28-2011, 07:10 PM

Quote:

Originally Posted by nards444

305 or 311 at the crank. And probably 260-280 at the wheel. I see you added some things so maybe your at 320

No way any V6 is that high at the wheels w/ just a muffler delete. We lose a lot more than that through the drivetrain.

DarkneSS · 03-28-2011, 07:13 PM

Quote:

Originally Posted by CC Performance

an engine is an air pump.. remove restrictions and it functions better... more air in more air out more power made
99.99% of the people who do cut outs make more power with them open than closed.... not sure what you guys had going on there but something sounds not right... I've never heard of someone losing power with the cut out open

finally someone with a brain! as long as you have exhaust manifolds/headers on the car you can have cut outs after and make more power. you will always makes more power, the back pressure bs is a myth.

im with you on not understanding these people who see less power with cut outs. the only reasonable explanation is they dont know what their doing and their cut outs are somehow smaller piping than stock.

wait until you do forced induction as well, open header nitrous or turbo/sc makes a lot more power.

*Milk 1027* · 03-28-2011, 08:54 PM

Quote:

Originally Posted by CC Performance

an engine is an air pump.. remove restrictions and it functions better... more air in more air out more power made
99.99% of the people who do cut outs make more power with them open than closed.... not sure what you guys had going on there but something sounds not right... I've never heard of someone losing power with the cut out open

I was scratching my head too...

VR Baron · 03-28-2011, 09:03 PM

To the op at catback should keep you close on the low end torque. Per magnaflow and other mfg's on the V6 and I'm sure the v8's you will lose bottom end IF your pipes are to big and loose flow velocity, but only a little bit it seems. The mufflers are the big bottleneck but only small gains.
The v6 mufflers are not straight through as the LS3, full of packing and turns, even a small built in J pipe for drone killing.But again only costing 5 hp or so.

Macrackie · 03-28-2011, 09:37 PM

Exhaust length and pulse length need to be matched for a good performing system. Very low restriction exhaust systems usualy make for a smaller torque number but higher peak horsepower. And same goes when reversed. Now for someone losing peak horsepower with cut outs it could be just do to possitioning alone. i.e. distance from header to cut out. To close or to far away and you can lose the scavanging effect of you exhaust system of one pulse pulling the next on out. This is a steady timed wave of pulses running though the pipe mess it up and you can lose both torque and horsepower. I have been fairly involved when tuning my harleys and know that just an inch in pipe length or a minor change in back pressure can make or brake peak numbers and ridability by changing the power band. Same theories apply to our cars but due to 6 or 8 cyls they tend to be easier to tune and harder to screw up.

Jabs · 03-28-2011, 10:16 PM

What about all the exhausts that are sold like the SLP Loudmouth 1 or the Magnaflow Competition? You loose power by adding an exhaust system? Felt the opposite to me...

03-28-2011, 12:33 PM	#17
KMPrenger Drives: 16 Camaro SS, 15 Colorado Join Date: May 2009 Location: Jefferson City, Missouri Posts: 13,943	I've read many times that loosing backpressure can lower your TQ output...but I'm no expert on that subject! __________________ 2016 Camaro 1SS - 8-speed - NPP - Black bowties 2010 Camaro 1LT V6 (Sold. I will miss her!)

03-28-2011, 12:50 PM	#19
Demon Hunter Drives: 2010 Black Camaro LT Join Date: Oct 2009 Location: So Cal Posts: 675 View My Garage	Back pressure is actually somewhat of a myth. It's all about the velocity of the gas traveling through the exhaust. If you go to big of diameter in pipe, you loose velocity, thus loosing power. I highly doubt cutting off those trash cans would be detrimental to the flow velocity through the exhaust. __________________

03-28-2011, 10:16 PM	#28
Jabs Drives: 2010 Black Camaro SS Stage 2 Join Date: Nov 2010 Location: Mclean VA Posts: 604	What about all the exhausts that are sold like the SLP Loudmouth 1 or the Magnaflow Competition? You loose power by adding an exhaust system? Felt the opposite to me... __________________

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03-28-2011, 11:34 AM	#15
CC Performance Account Suspended Drives: 99 Camaro SS, 79 z28, 70 GTX Join Date: Oct 2009 Location: ST Helens, OR Posts: 1,759	an engine is an air pump.. remove restrictions and it functions better... more air in more air out more power made 99.99% of the people who do cut outs make more power with them open than closed.... not sure what you guys had going on there but something sounds not right... I've never heard of someone losing power with the cut out open

03-28-2011, 09:03 PM	#26
VR Baron SoCal Camaro5 Race Team Drives: 2021 Shadow Grey Camaro 2SS 1LE Join Date: Mar 2010 Location: SO CAL Posts: 14,288	To the op at catback should keep you close on the low end torque. Per magnaflow and other mfg's on the V6 and I'm sure the v8's you will lose bottom end IF your pipes are to big and loose flow velocity, but only a little bit it seems. The mufflers are the big bottleneck but only small gains. The v6 mufflers are not straight through as the LS3, full of packing and turns, even a small built in J pipe for drone killing.But again only costing 5 hp or so.

03-28-2011, 09:37 PM	#27
Macrackie Drives: 2011 Camaro LS Stripper model Join Date: Feb 2011 Location: South Beloit IL Posts: 641	Exhaust length and pulse length need to be matched for a good performing system. Very low restriction exhaust systems usualy make for a smaller torque number but higher peak horsepower. And same goes when reversed. Now for someone losing peak horsepower with cut outs it could be just do to possitioning alone. i.e. distance from header to cut out. To close or to far away and you can lose the scavanging effect of you exhaust system of one pulse pulling the next on out. This is a steady timed wave of pulses running though the pipe mess it up and you can lose both torque and horsepower. I have been fairly involved when tuning my harleys and know that just an inch in pipe length or a minor change in back pressure can make or brake peak numbers and ridability by changing the power band. Same theories apply to our cars but due to 6 or 8 cyls they tend to be easier to tune and harder to screw up.