Does the AIT sensor effect fueling?
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Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by Pocket
... That's a neat trick. I'll see Jody today so I'll ask him how he did it. Wonder if it does anything for high altitude lag? ...
Say hello from Gene, and see if he remembers my special duct tape installation of his chip. Tell him that his special sifting tune is working out to my satisfaction, and I haven't experienced a single PCM commanded torque demand downshift from 4th to 3rd when towing a grade. His 40 tow will be thoroughly tested Mon when I leave Reno and head up to Donner Pass.
Originally Posted by Pocket
... Definately something to look into instead of using the relief valve. ...
Post Fiend
Joined: Feb 2007
Posts: 7,191
Likes: 4
From: Blairsville,Ga
Originally Posted by ernesteugene
Tell him that his special sifting tune is working out to my satisfaction, and I haven't experienced a single PCM commanded torque demand downshift from 4th to 3rd when towing a grade. His 40 tow will be thoroughly tested Mon when I leave Reno and head up to Donner Pass.
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Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by rbaker6336
sorry for the hijack but are you saying jody put something in you tune to delay downshifting?
His first attempt to do this worked as planned for gears 1, 2, and 3, but since he'd disabled PCM control over the tranny, the OD button no longer worked and I couldn't shift into 4th gear.
He wound up giving me special versions of his 40 and 60 tow tunes with modified shifting which removes as much PCM control over the tranny as possible, and I switch to those when towing, and use the regular versions when running empty. I never want the PCM to shift the tranny when it's under the heavy load of towing, as that scuffs the clutches and causes excess wear. When I tow I make all shifts manually with the TC locked, and I let off the throttle to take the load off the drive line before shifts, and then get slowly back on the throttle just like shifting a manual.
Here are some background links if you want more details.
Possible 4R100 mods to make it an 8 speed manual?
https://www.ford-trucks.com/forums/590088-possible-4r100-mods-to-make-it-an-8-speed-manual.html?highlight=first+towing+report
My new DP Tuner really sucks (air, that is!!!)https://www.ford-trucks.com/forums/607309-my-new-dp-tuner-really-sucks-air-that-is.html?highlight=first+towing+report
Recent mods, CC pressure gauge, CCV, and DP Tuner!
https://www.ford-trucks.com/forums/607571-recent-mods-cc-pressure-gauge-ccv-and-dp-tuner.html?highlight=first+towing+report
Towing Report with DP Tuner, CCV mod, & CC Pressure Gauge!
https://www.ford-trucks.com/forums/609000-towing-report-with-dp-tuner-ccv-mod-and-cc-pressure-gauge.html?highlight=first+towing+report
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
I think Kris moved his MAP hookup to the hot side as well. IIRC, he drilled and tapped the intake spider, using a simple barbed fitting. I keep meaning to do this too, but it always slips my mind when I have the IC tubes off for something else. Maybe I'll do this when I install new valve springs.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by jtharvey
I think Kris moved his MAP hookup to the hot side as well. IIRC, he drilled and tapped the intake spider, using a simple barbed fitting. I keep meaning to do this too, but it always slips my mind when I have the IC tubes off for something else. Maybe I'll do this when I install new valve springs.
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