Straight piped for power

bryan_Z34 · 09-30-2014, 01:52 PM

Hey guys, currently I'm running non resonated test pipes , Topspeer 2.5 inch dual cat back, and my own shirt tails with those hemlotz resonators in them. Leo you think I am loosing any significant power ?? My car is a 2014 Nismo 370z btw

DEpointfive0 · 09-30-2014, 01:57 PM

Why would you lose power?

bryan_Z34 · 09-30-2014, 02:27 PM

No pressure in the bsck anymore

bryan_Z34 · 09-30-2014, 03:30 PM

I removed th mufflers

kornflake7 · 09-30-2014, 03:34 PM

Just changing the mufflers isn't gonna lose or gain you any power

bryan_Z34 · 09-30-2014, 05:42 PM

Exactly! Why the hell
Do people keep insisting I am loosing power and torque from taking off my mufflers from my cat back

Rusty · 09-30-2014, 07:31 PM

Do you know what your A/F is? With the muffler gone. You might be lean.

09-30-2014, 07:33 PM

Quote:

Originally Posted by Rusty

Do you know what your A/F is? With the muffler gone. You might be lean.

Agree.

bryan_Z34 · 09-30-2014, 07:41 PM

I have no idea, but if I am, a tune would correct it? Btw what wre consequences of running lean

Tadpole · 09-30-2014, 08:34 PM

Don't worry about running lean. I put a custom dual with top speed axle backs and my Z screams. I even picked up 2-3mpg too. I'm at 22.5 on daily and 28 hwy. Go for it and you will be happy. There is a bit of drone tho.

aszyd · 09-30-2014, 09:19 PM

Quote:

Originally Posted by bryan_Z34

Exactly! Why the hell
Do people keep insisting I am loosing power and torque from taking off my mufflers from my cat back

They are insisting that you are losing low down torque due to the loss of back pressure from having no restrictions, such as cats, and a larger pipe diameter, which would increase flow. A tune would correct the A/F and bring some of that lost power back.

As for consequences, if you were really lean it could cause detonation and damage your engine. I doubt that's happening though. The ECU will compensate as much as it can.

Rusty · 09-30-2014, 09:47 PM

Quote:

Originally Posted by aszyd

They are insisting that you are losing low down torque due to the loss of back pressure from having no restrictions, such as cats, and a larger pipe diameter, which would increase flow. A tune would correct the A/F and bring some of that lost power back.

As for consequences, if you were really lean it could cause detonation and damage your engine. I doubt that's happening though. The ECU will compensate as much as it can.

When the ECU is in closed loop. It can adjust the A/F pretty close to where it needs to be, unless it is too far to the one side. Then you need a tune. At WOT, think you will need a tune to correct the A/F. As for engine damage. Agree, detonation, burnt exhaust valves, turn the tops of the pistons into silly putty, burn the ends of the spark plugs off, etc. Don't ask me how I know.

bryan_Z34 · 10-01-2014, 12:00 AM

wow, so exactly how much power (hp and torque) am I really loosing from being straight piped on my nismo? even with a tune will I never have as good power output as with mufflers?

Rusty · 10-01-2014, 01:53 AM

Hard to guess on power loss. The only way to know for sure is to dyno before and after. You lost a couple ponies, and some torque on top. How much, don't know. With a tune. You might be more then what you had before the mods. Don't know because you have no base line.

Jordo! · 10-01-2014, 02:16 AM

Probably not losing any power down low -- test pipes and exhaust delete are common mods that haven't shown losses to the best of my knowledge -- and you almost certainly gained a good bit up top.

Now, how the ECU has adjusted to these changes (especially without a tune to deal with the missing cats...) isn't clear.

Do you have a CEL (SES) light on?

09-30-2014, 01:52 PM	#1 (permalink)
bryan_Z34 Base Member Join Date: Aug 2014 Location: miami Posts: 130 Drives: 2014 370z Nismo Rep Power: 12	Straight piped for power Hey guys, currently I'm running non resonated test pipes , Topspeer 2.5 inch dual cat back, and my own shirt tails with those hemlotz resonators in them. Leo you think I am loosing any significant power ?? My car is a 2014 Nismo 370z btw

09-30-2014, 01:57 PM	#2 (permalink)
DEpointfive0 A True Z Fanatic Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17152	Why would you lose power? NickTurnon likes this. __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

09-30-2014, 03:34 PM	#5 (permalink)
kornflake7 Base Member Join Date: Mar 2014 Location: San Antonio, TX Posts: 233 Drives: 2013 Nismo 370z Rep Power: 12	Just changing the mufflers isn't gonna lose or gain you any power Chuck33079 likes this.

09-30-2014, 07:31 PM	#7 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,525 Drives: 2011 Nismo GM 6M Rep Power: 2684439	Do you know what your A/F is? With the muffler gone. You might be lean. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

09-30-2014, 08:34 PM	#10 (permalink)
Tadpole A True Z Fanatic Join Date: Sep 2013 Location: Lockhart, TX Posts: 1,082 Drives: 13 Nissan 370Z A7 Rep Power: 18	Don't worry about running lean. I put a custom dual with top speed axle backs and my Z screams. I even picked up 2-3mpg too. I'm at 22.5 on daily and 28 hwy. Go for it and you will be happy. There is a bit of drone tho. __________________ Takeda TR3009P Short Ram Intakes, Custom Dual Exhaust, X-Piped with 18" Resonators & TopSpeed Axle Backs. EVO-R Led Third Foglight,

09-30-2014, 02:27 PM	#3 (permalink)
bryan_Z34 Base Member Join Date: Aug 2014 Location: miami Posts: 130 Drives: 2014 370z Nismo Rep Power: 12	No pressure in the bsck anymore

09-30-2014, 03:30 PM	#4 (permalink)
bryan_Z34 Base Member Join Date: Aug 2014 Location: miami Posts: 130 Drives: 2014 370z Nismo Rep Power: 12	I removed th mufflers

09-30-2014, 05:42 PM	#6 (permalink)
bryan_Z34 Base Member Join Date: Aug 2014 Location: miami Posts: 130 Drives: 2014 370z Nismo Rep Power: 12	Exactly! Why the hell Do people keep insisting I am loosing power and torque from taking off my mufflers from my cat back

09-30-2014, 07:41 PM	#9 (permalink)
bryan_Z34 Base Member Join Date: Aug 2014 Location: miami Posts: 130 Drives: 2014 370z Nismo Rep Power: 12	I have no idea, but if I am, a tune would correct it? Btw what wre consequences of running lean

10-01-2014, 12:00 AM	#13 (permalink)
bryan_Z34 Base Member Join Date: Aug 2014 Location: miami Posts: 130 Drives: 2014 370z Nismo Rep Power: 12	wow, so exactly how much power (hp and torque) am I really loosing from being straight piped on my nismo? even with a tune will I never have as good power output as with mufflers?

10-01-2014, 01:53 AM	#14 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,525 Drives: 2011 Nismo GM 6M Rep Power: 2684439	Hard to guess on power loss. The only way to know for sure is to dyno before and after. You lost a couple ponies, and some torque on top. How much, don't know. With a tune. You might be more then what you had before the mods. Don't know because you have no base line. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html Last edited by Rusty; 10-01-2014 at 06:13 AM.

10-01-2014, 02:16 AM	#15 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 419	Probably not losing any power down low -- test pipes and exhaust delete are common mods that haven't shown losses to the best of my knowledge -- and you almost certainly gained a good bit up top. Now, how the ECU has adjusted to these changes (especially without a tune to deal with the missing cats...) isn't clear. Do you have a CEL (SES) light on? __________________ Enjoy it. Destroy it.

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