Luck has nothing to do with it. Making sure all systems were operating as designed had everything to do with it.Building a fairly stock motor designed to work within stock Ford program functions insured a great running combo.
At 6mpg there is obviously something amiss in his setup.Chances are good its something very simple like a TPS reading out of range,an O2 sensor not feeding back correctly or at all,timing to retarded or a bad ECT sensor. All basic things that paying for a dyno tune would render useless. Im just suggesting before he pays for a dyno tune he spends an afternoon checking all the basics {because most dyno shops wont} and making sure everything is operating 100% correctly before dropping $300-400 on a shop tune to only end up where it should have been to begin with. I would guess at least double the MPG is possible in his Ranger with current parts.
well, i am taking for granted he coded it and checked his closed and open loop parameters. so i have to give you that much. if the basics are shit, the tuner is gonna be pissed and bump you and your wallet.
i completely understand he could have some wrong or non functioning signals which could be quick fixes that could easily get it to the teens driving conservatively. even if the o2's are simply too far out of the fire, it will kill mpg. thats why hi flow cats can actually help, especially with true duals...the heat range is better. but thats all in tuning. sometimes tuning is mechanical...like exaust/cam degrees ect... these things are usually only seen on the rollers clear enough to make the right decisions..
but, seriously...luck does have allot to do with it. and sorry if you dont understand that. the stock programming leaves a hell of allot on the table for specific operations. the oem programming is the jack of all trades.
if a guy is happy with oem ford eec4 pushrod power....fine. working within that can be done mechanically with gearing, cam selection, and injectors to get close....i am very familiar with the combinations.
but take a perfectly running oem truck brand new off the assembly line, roll down the road to a shop and add 6-8 inches of lift and 35 in tires and then go ripping around wot....as nutless as it would be....hey, touching single digits in mpg is what the result would be...8-9-10 mpg is reasonable.. nursing it....12 would be great. 14-15 hiway would be awesome.
in his case, as built, according to whats been stated and shown in pictures, a canned tune can work pretty good...but a dyno tune would be ideal.
if he had a bone stock 351 and a sane crossed over exhaust, then a b100 style maf sefi 351 system from a van or late bronco would be ideal.
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