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Old 05-26-2010, 06:39 AM   #116 (permalink)
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Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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I agree that turbo > supercharger, especially for FE. As far as the OBDI vs OBDII thing, does your truck use a MAP sensor or a MAF sensor? If it's MAP, a different sensor, bigger injectors and computer tuning will be needed. If it's MAF, bigger injectors will be needed, but it can adjust itself for mild amounts of boost (probably up to 3-5 psi). Just make sure you put the MAF sensor before the turbo. I'd check with a Ford performance forum to confirm the details.
Call me crazy, but I actually try for mpg with this Jeep:

Typical driving: Back in Rochester for school, driving is 60 - 70% city
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