[Z06] Gas Millage and Headers
Thread Starter
Pro
Joined: Dec 2005
Posts: 688
Likes: 0
From: las Vegas N.V.
Gas Millage and Headers
It seems my gas millage has gone down a little after I put LT headers and tune. I use to get about 29 mpg on the highway now about 24mpg. Is this normal? I never noticed it before, but just took a nice road trip and reset my fuel average before I left. Thanks Brian
Melting Slicks
Joined: May 2007
Posts: 2,533
Likes: 1
From: North Aurora IL
Get it dyno tuned and you will be fine....and your probably keeping the rpm's a bit higher than you used to just to hear that beautiful sound of the exhaust
Safety Car
Joined: Jun 2006
Posts: 3,787
Likes: 2
From: Wildomar CA
Look at my mods in sig, I got 29.4 mpg on the way home from the tune. I had a passenger and drove all the way to vegas and back with cruise set on 90-95, did a couple "spirited" driving runs and had 45 minutes of stop and go traffic on each trip due to road construction and an SUV rollover. Averaged 25 mpg both ways.
It isn't the long tubes effecting gas mileage.
It isn't the long tubes effecting gas mileage.
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Brett Foote
Team Owner
Joined: Mar 2001
Posts: 25,889
Likes: 7
From: Virginia Beach
CI 3-5-6-7-8 Veteran
Tuning after headers shouldn't effect cruise MPG. Tuning for bolt-ons is generall WOT tuning to dial in the AFR.
When you're cruising the car is in closed loop and using the MAF and O2 readings in an attempt to achieve stoich or 14.7:1 AFR.
At WOT you go into open loop and pre-set fueling tables come into play, which is why you need to get the car tuned after mods as the car can't account for the new air flow.
FWIW I'm seeing 27-29 mpg w/ CC set on the highway even w/ my G5-X2 cam. However, around town I'm averaging 16-17mpg vs. 19-20 before.
When you're cruising the car is in closed loop and using the MAF and O2 readings in an attempt to achieve stoich or 14.7:1 AFR.
At WOT you go into open loop and pre-set fueling tables come into play, which is why you need to get the car tuned after mods as the car can't account for the new air flow.
FWIW I'm seeing 27-29 mpg w/ CC set on the highway even w/ my G5-X2 cam. However, around town I'm averaging 16-17mpg vs. 19-20 before.