Tweaking exhaust system, mileage improvement?
07-19-07, 06:00 PM
#16
Duals on mine-absolutely no increase in MPG but perhaps a couple of ponies. I currently have an intake on it (sorry ,don't post here much) and that seems to have helped out a bit more than the exhaust. Headers is what this truck really needs. They work wonders on my Tundra and SC430 and would really wake this beast up.
Lee
Lee
07-19-07, 06:40 PM
#17
Super Moderator
The bigest restriction in the exhaust is probably the cats. High altitude kills power but does not seam to hurt mileage. Less air, less wind resistance. The computer trims back the fuel so you are not running too rich. My Lightning made 9# of boost at sea level and only made 6# at 6750 ft. (Big Bear Lake).
To make a GX really run you would need a lot of power because of all wheel drive and the weight of it. If it ran about 11.90 and was dead quiet it would be a fun ride.
To make a GX really run you would need a lot of power because of all wheel drive and the weight of it. If it ran about 11.90 and was dead quiet it would be a fun ride.
I agree with you on high altitude killing power, not mileage as I have compared it when running the Mexican gas at sea level and at altitude city/highway and almost no difference.
07-20-07, 08:37 AM
#19
Driver
Thread Starter
Tweaking exhaust system, mileage improvement?
Duals on mine-absolutely no increase in MPG but perhaps a couple of ponies. I currently have an intake on it (sorry ,don't post here much) and that seems to have helped out a bit more than the exhaust. Headers is what this truck really needs. They work wonders on my Tundra and SC430 and would really wake this beast up.
Lee
Lee
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