BANNED by Kris
Join Date: Oct 2011
Location: Pasadena, CA
Thanked 114 Times in 106 Posts
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Agreed, custom tunes are written with deceleration in mind (unlike what the Engineers at Ford gave us). As long as the TC is locked you are getting no torque manipulation from the turbine BUT you are also getting no slipping as is the case when going down a hill. As stated above when you accelerate the fluid moving from the pump (attached to the motor) to the face of the turbine (attached to the Transmission) spins the turbine that spins the trans that spins the wheels. On decel everything is working backward, the engine is slowing down (so the pump is slowing down) BUT the wheels want to move faster (spinning the trans faster and then the turbine faster). The engine is no longer the dominating force in the TC and the truck speeds up (I know, long setup). With tunes the writers have programmed their chips so that as you decelerate the trans will stay locked allowing the engine to remain the dominating force to the wheels and thus uses it's compression to slow down the truck. My tunes Lock in 4th and in 3rd and will ride the engine, shifting itself, till the motor has slowed the wheels to about 20 MPH (depending on slope and trailer weight) before unlocking or me accelerating again. If you want more decelerating force then this you need to start looking toward a Exhaust Brake.
-'97 Mini Monster
-Bean's: 160/100 (FF Injectors), 2/ 6-POS chips (TW & Beans tunes), Overboost controller, E-Fuel
-BANKs: downpipe, full exhaust, gauges, intercooler
-Irate: T-4 kit, IC pipes, 3" Irate Plenums, BASB Turbo
-Stage II trans.
-Mag-Hytec trans. and pumpkin covers
-6637, CCV, IDM, 6.0 Fan, 49-Federal PCM swap, MAP line Mod
-370 Amp alt., 40k trans cooler, ADRENALINE PUMP
-twin on-board air w/ 10 gal. tank
-'15 F350 6.7L DRW 4x4
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