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6.4 Aftermarket
6.4 towing performance
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[QUOTE="Randall12v, post: 989887, member: 4879"] I'm looking to get suggestions on how to get the best out of my '09 6.4, in the sig below...So far I've been unhappy with shifting and fuel mileage. I just returned from a 1800 mile round trip, half of which was hauling a '06 Ford Escape on my 20' bumper hitch trailer (not a terribly heavy load). With the Spartan tuning, set to "210 tow performance" I was averaging 10-11.5mpg with this load. On the trip home, with mostly empty trailer (small load of antique corrugated tin and barn wood) I could only muster 12mpg at best. Cruise was used most of way, set between 70-75mph. Tow haul was used when I first started the trip. I'm not sure how Spartan's tuning affects the trans tuning, (if at all)...but with the trans in "tow/haul" the shifts were crazy firm, sometimes felt like slipping, others it would shift perfect, never was the shifting consistent. (Please understand, the truck has a topper, I drive like a freaking Grandpa) After a few shifts, and thinking the transmission fell out somewhere on the interstate... I turned tow/haul off which seemed to make the trans. be happy as can be. The truck has a new "Modified Direct Clutch Solenoid" in the transmission from Empire Diesel, it did seem to make the shift points a little firm compared to factory. This was installed maybe 8-10k miles ago. This trip was the first time I hauled something this "heavy" with this new solenoid in place. I've tried contacting a few 6.4 tuning places, and so far only been told custom tuning for the Spartan is no longer available. Even if this were possible, is it possible to make a custom tune for the transmission shift points? How does tow/haul affect the Spartan or that solenoid? I'm at the point now where I'm willing to try something different...whether this means buy new programmer, remove the modified solenoid, other custom tuning, etc. So with that stuff where should I start??? All I'm looking for is: 1. more consistent shifting whether in "drive" or "tow/haul" 2. better mpg's whether DD'ing or towing Thanks in advance! [/QUOTE]
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