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Old 07-25-2008
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mods and mileage

I am thinking about doing some mods to my truck. I'm thinking about getting jba headers, x-cal tuner, cold air intake, and underdrive pulley. I have a 4.0 4x4 auto and currently get ~15mpg. Only mod I currently have is a cat-back system. Anyone care to guess how much hp and mpg I could gain from these mods?
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Old 07-25-2008
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I have a 3.0 with 31s and 4.10s and get about 17hwy/city with a x-cal. I'd say your best money would be on the underdrive pulley and driving accordingly. Tuner i don't think netted me much gain, i'm going to go back to the 89 tune from the 87 and see if it gets me anywhere.
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Old 07-25-2008
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Quote:
Originally Posted by Goodysgotacuda View Post
I have a 3.0 with 31s and 4.10s and get about 17hwy/city with a x-cal. I'd say your best money would be on the underdrive pulley and driving accordingly. Tuner i don't think netted me much gain, i'm going to go back to the 89 tune from the 87 and see if it gets me anywhere.

If your milage doesn't drop 1-2, I'll be very surprised. I did the same thing (dropped to an 87 tune), and milage went to 14!!! I am at about 16 now.


I want to do UDP's and ignition coil pack...then it's on to bigger and better things.
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Old 07-26-2008
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has anyone done dyno tests on these mods? I'm really curious to see the gains.
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Old 07-26-2008
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The best way to increase your MPG is by changing your driving habits! Don't throw your money away on useless performance mods!!
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Old 07-26-2008
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Originally Posted by 03DualSport View Post
has anyone done dyno tests on these mods? I'm really curious to see the gains.

underdrive crank pulley pulled another 7-8?rwhp and 11rwtq i believe. Those are just figures off the top of my head. I'd like to pick one up for my truck. I can use a new serpentine belt on my engine, but i'd like to wait until i can get the pulley as well.
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Old 07-26-2008
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well I'm not doing this just for the mpg, I want more hp. So, if you can answer my above questions please reply, if not move along.
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Old 07-26-2008
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Originally Posted by Goodysgotacuda View Post
underdrive crank pulley pulled another 7-8?rwhp and 11rwtq i believe. Those are just figures off the top of my head. I'd like to pick one up for my truck. I can use a new serpentine belt on my engine, but i'd like to wait until i can get the pulley as well.
x2, I had one for a LONG time, and gave it to dominic (a member on here) and I did notice a power loss. I took it off because i couldn't get rid of the belt whine (even after a new belt), narrowed it down to the pully, it was worn down. But dom has no probs with it that I know of.

I'm looking for another one soon. It's up there.
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