Quote:
Originally posted by Vandal_89
My '92 F-250 has a 5.8 with a 5 Spd. I was hoping to convert to mass air so I could change the cam and increase the injector size. What I am looking for is better low end torque and greater horsepower. I was thinking that mass air might just be the ticket. The truck is mainly used to tow my Snowmobiles, ATVs, and miscellaneous trailers such as my ~8000 RV. But I also use it alot in the fall foing off-road getting to out of the way elk & deer hunting locations (usually through mud and snow).
I know with my '87 mustang I was getting like 18 mpg and when I put header, off-road h-pipe, changed injectors to 24 lbs and went to Mass air i got almost 22 mpg. My pickup get 12 mpg now.... and towing my ~8000 lb trailer it gets like 8 mpg.
I'm assuming that the A9L conversion will use the same wiring harness and wiring pin change for a mustang Mass Air Conversion When did my mustang conversion I thing the most expensive parts were the computer and MAF.
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Be very happy with that 12 mpg in your F250 Ext. Cab 4x4. That's as good as you'll probably ever get. Remember your truck is VERY heavy. That mass air will do nothing for your gas mileage. If it did I'd be VERY suprised. I'd say 12 mpg is pretty good. Your best bet on cam is to get a custom one ground by Terry at Cam Motion. They can grind you a custom speeddensity cam and you may pick up gas mileage there (who knows) but you'd for sure get more power. As for the injectors I'd just leave them alone. 24 lb injectors will do nothing for gas mileage and the 19s are plenty for the power you'll have. Go ahead and change to the GT40 intake as well (whether you do mass air or not) like I mentioned in my email to you. Your biggest restriction is those crap heads. You might think about at least getting a set of GT40 cast iron heads, too. You can pick those up used for around $300 easily. Do the heads, intake, custom grind cam and you'll be VERY happy. And it might just increase your gas mileage and for sure a good increase in power. Much better money spent on that rather than the mass air set up IMO.