Will longtubes and ory help gas mileage?
Will longtubes and ory help gas mileage? Will longtubes and ory help gas mileage? I heard that longtubes tend to make our cars run rich, wouldn't this decrease mileage? 
i would say the off road race headers and off road y pipe would be best on gas milage. most headers flow about the same unless ur spending a fortune. and i think he's right on the tune no matter what headers w/o a tune. i guess keeping cats and the o2's behind the cats might keep the AFR more stable though.
Once you have the car tuned correctly, headers will actually increase fuel economy slightly because of decreased pumping losses.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
On The Tree
Joined: Feb 2002
Posts: 187
Likes: 0
From: Chitown
I noticed very nice MPG increase at the time of my Mac/ORY install. The car was not completely tuned, but I would think anything that would increase the breathing efficiency of the engine would also increase gas milage.
Well, maybe not heads/cam...but removing restrictions
-Doug
Well, maybe not heads/cam...but removing restrictions
-Doug
TECH Addict
Joined: Jun 2005
Posts: 2,660
Likes: 14
From: England
Originally Posted by memphisTa
Will longtubes and ory help gas mileage? I heard that longtubes tend to make our cars run rich, wouldn't this decrease mileage?
YES/NO
It all depends how you drive it. If you drive as hard as you where before then it WILL use more fuel. However as you will see a gain in BHP you will not need to drive as hard to acheive the same performance so you may in fact see no loss or even a slight gain.
An easy way to visulise it.
When the VW Golf was launched it had a 4 speed 1.6 litre engine. VW upgraded this to a 1.8 and a 5 speed. Logic would suggest the larger engine would use more fuel. However becuase the 1.8 produced more power it got 5 gears meaning you didn't have to drive it as high in the rpms as often, the result was a significant leap in fuel economy.
