Better gas mileage after headers?
TECH Apprentice
Joined: Jan 2004
Posts: 353
Likes: 0
From: san clemente
my gas mileage went waaaay downhill after the header/dual install. its definitely worth it tho just to hear that car rev up and fly. maybe after a tune it'll get better. You are one lucky guy to have better gas mileage now after the install
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TECH Junkie
Joined: May 2003
Posts: 3,050
Likes: 0
From: its fucking cold
In theory is should go up. The engine is working more eficiently than it was before....that should increase mileage. I know that Nine Ball said his ols SS vert got better mileage after the heads/cam since everything was working more efficiently....Colonel said the same about his H/C Z28.
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mine went in reverse...dropped from about 20mpg to about 15. My PCM was dumping a lot of fuel when I scanned it. The weird thing was I put on an underdrive pulley and got my 5mpg back. It's been hovering around 20 ever since and my PCM dumps less fuel (I still need to have it tuned though)
11 Second Club
Joined: Feb 2003
Posts: 5,524
Likes: 1
From: The South
If you have it tuned, or the air/fuel ratio just happens to be good and you drive it the same you should see slightly increased gas mileage. Maybe not anything you notice, but it should get better.
Mine didn't.
Mine didn't.
I have headers and true duals. My mileage, the best I have seen, is 22 mpg. That is with a mix of in town and interstate running. I think if anything I have stayed the same. If I run the car hard I can still get 17 mpg. My Ltrims are in the +5% range. Strims are around 3% to 6%. So I am alittle lean but not to bad for no tune.
You reducing backpreasure so it should go up, but with most it dosent becuase we romp on it a lot more because of the new found sound. Also heads will improve gasmilage because of better efficency in the burn of the A/F mixture.
