Unequal length headers

Tan370z · 06-17-2016, 01:54 AM

Hello everyone. I am curious to hear your guys opinions on unequal length headers? What are the hp gains one would expect from them? What are some good brands? I'm not looking for LTH because I just got my ART test pipes and want to keep them for a while. Any input other greatly appreciated! BTW I drive a 2016 base model 6MT 370z and am expecting to have aam short tails with aam s line mid and ypipe with ART test pipes and g3 intakes

SS_Firehawk · 06-17-2016, 03:33 AM

If you're looking for shorty headers, the Z1 headers are your only real good option. With that being said, you will need to change the flange connecting the header to the ART pipe or buy a DE version of that ART pipe.

Tan370z · 06-17-2016, 08:48 AM

Is there any website or place that I can buy the flange or do I have to do it myself? Thanks for the reply!

B&W_Evader · 06-17-2016, 09:01 AM

I've seen at least 1 website claiming improved hp with unequal length headers. Something about the pressure pulse. I have a hard time believing them since it seems to me the unequalness would need to change with RPM. Personally, I'd stick with tuned (equal length) headers. I guess that might be considered old-school now. I think they sound better too. I do like the idea of the resonated ART test pipes though. Never heard them, never tried them, but they look interesting.

SouthArk370Z · 06-17-2016, 10:03 AM

It's not whether or not the tubes are of equal length but how well the system - from intake, through filter, TB, manifold, cam timing, &c, to the exhaust tips - is tuned for scavenging. Google "exhaust scavenging" for more info.

Slartibartfas · 06-17-2016, 10:56 AM

I highly doubt unequal length headers in and of themselves offer a power advantage. They will slightly reduce peak torque but will broaden the top of the torque curve making the engine a bit less peaky.

SS_Firehawk · 06-18-2016, 03:53 AM

Z1 sells those headers and the flange you need. I would only take it to a top notch welder. Also, those headers are equal length. Now keep in mind, equal length has variance. It's not 100% equal.

Slartibartfas · 06-18-2016, 12:02 PM

Luckily, these are analog waves, not digital, so slight primary length differences won't cause much phase difference.

Tan370z · 06-19-2016, 10:28 PM

Thanks for the replies everyone!!

Tan370z · 06-19-2016, 10:35 PM

Is this the flange your talking about?[IMG]www.z1motorsports.com/advanced_search_result.php?keywords=Z1+header+flan ge[/IMG]

06-17-2016, 01:54 AM	#1 (permalink)
Tan370z Base Member Join Date: Jun 2016 Location: Riverside CA Posts: 45 Drives: 16 Nissan 370Z W M6 Rep Power: 8	Unequal length headers Hello everyone. I am curious to hear your guys opinions on unequal length headers? What are the hp gains one would expect from them? What are some good brands? I'm not looking for LTH because I just got my ART test pipes and want to keep them for a while. Any input other greatly appreciated! BTW I drive a 2016 base model 6MT 370z and am expecting to have aam short tails with aam s line mid and ypipe with ART test pipes and g3 intakes

06-17-2016, 03:33 AM	#2 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7334	If you're looking for shorty headers, the Z1 headers are your only real good option. With that being said, you will need to change the flange connecting the header to the ART pipe or buy a DE version of that ART pipe. gomer_110 likes this. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

06-17-2016, 09:01 AM	#4 (permalink)
B&W_Evader Track Member Join Date: Aug 2011 Location: CA Posts: 972 Drives: slower than before Rep Power: 386	I've seen at least 1 website claiming improved hp with unequal length headers. Something about the pressure pulse. I have a hard time believing them since it seems to me the unequalness would need to change with RPM. Personally, I'd stick with tuned (equal length) headers. I guess that might be considered old-school now. I think they sound better too. I do like the idea of the resonated ART test pipes though. Never heard them, never tried them, but they look interesting. SouthArk370Z likes this. __________________ \|RIP\|6spd-sport\|OSG-LSD\|XP8\|RBF600\|Eibach Sways\|RE-71R\|FI-34Row\|Gen3-CAI\|Yaw P.S.\|

06-17-2016, 10:03 AM	#5 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	It's not whether or not the tubes are of equal length but how well the system - from intake, through filter, TB, manifold, cam timing, &c, to the exhaust tips - is tuned for scavenging. Google "exhaust scavenging" for more info. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma Last edited by SouthArk370Z; 06-17-2016 at 11:45 AM. Reason: Fixed some spelling and grammar

06-17-2016, 10:56 AM	#6 (permalink)
Slartibartfas Track Member Join Date: Apr 2016 Location: Houston Posts: 551 Drives: 2011 G37S sedan Rep Power: 10	I highly doubt unequal length headers in and of themselves offer a power advantage. They will slightly reduce peak torque but will broaden the top of the torque curve making the engine a bit less peaky. __________________ 2011 Journey Sport sedan 7AT \| SPL front, SPC rear camber arms \| ARK Grip cat-back \|

06-17-2016, 08:48 AM	#3 (permalink)
Tan370z Base Member Join Date: Jun 2016 Location: Riverside CA Posts: 45 Drives: 16 Nissan 370Z W M6 Rep Power: 8	Is there any website or place that I can buy the flange or do I have to do it myself? Thanks for the reply!

06-18-2016, 03:53 AM	#7 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7334	Z1 sells those headers and the flange you need. I would only take it to a top notch welder. Also, those headers are equal length. Now keep in mind, equal length has variance. It's not 100% equal. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

06-18-2016, 12:02 PM	#8 (permalink)
Slartibartfas Track Member Join Date: Apr 2016 Location: Houston Posts: 551 Drives: 2011 G37S sedan Rep Power: 10	Luckily, these are analog waves, not digital, so slight primary length differences won't cause much phase difference. __________________ 2011 Journey Sport sedan 7AT \| SPL front, SPC rear camber arms \| ARK Grip cat-back \|

06-19-2016, 10:28 PM	#9 (permalink)
Tan370z Base Member Join Date: Jun 2016 Location: Riverside CA Posts: 45 Drives: 16 Nissan 370Z W M6 Rep Power: 8	Thanks for the replies everyone!!

06-19-2016, 10:35 PM	#10 (permalink)
Tan370z Base Member Join Date: Jun 2016 Location: Riverside CA Posts: 45 Drives: 16 Nissan 370Z W M6 Rep Power: 8	Is this the flange your talking about?[IMG]www.z1motorsports.com/advanced_search_result.php?keywords=Z1+header+flan ge[/IMG]

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