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Old 06-20-2008, 01:17 AM   #38 (permalink)
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Join Date: Jan 2008
Location: Manhattan, NY
Posts: 23

ZJ - '96 Jeep Grand Cherokee Laredo
90 day: 21.96 mpg (US)
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Originally Posted by nascarnation View Post
I have picked up a newer model equal length intake manifold for a swap but am wondering if it is even worth the effort.
I did it to my 96, and it was not worth the effort. I used my g-tech to compare before and after (at 0, 100, 500 and 1000 miles) and saw zero performance gain. My mpg went up 2 hundredths, hardly worthy of mention. The intake that is currently on your engine is tuned to lower end power. Sell it to some sucker on ebay that thinks it will make their 4.0 a rocket sled.

As far as my mpg, believe what you will, if you are ever in my neck of the woods you can borrow my rig for a few days and you can decide for yourself. I have owned all three engine variants in 4 different ZJ's, 20mpg on a stock vehicle is difficult but attainable (although my 5.2 rarely saw above 16mpg - even on short bursts). My current ZJ is more modified than I care to admit and frankly, I am disappointed that I cant consistently crack 22mpg. I chalk it up to the nature of traffic here.
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