94-95 Mustangs Tuning Automatic Transmission

From Mustang-Tech

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AODE to 4R70W Automatic Transmission Settings

I borrowed most of these settings from a tune written by Jerry for the W4H0 (Jerry created the J-mod)

Don LaSota has a great article on AODE to 4R70W swaps

Required Changes

To adjust for the wider ratio 4R70W

scalar value
trans_gear_ratio_1 2.84
trans_gear_ratio_2 1.55
trans_gear_ratio_3 1.00
trans_gear_ratio_4 0.70

Optional Changes

You will now have to play with the up and down shiftpoints and convertor lock and unlock functions.

When changing these functions, be sure that none of the lines cross. It is advised to start from the stock functions and ratio ALL functions by the same amount.

AODE/4R70W Recommended Changes

Disallow Shifting into Overdrive at WOT

scalar value
trans_wot_shift_34 7000
trans_2-1_pullin_max_speed 40
trans_TV_adder_34 12
trans_TV_adder_34_time .5
trans_mnossper 0
trans_dnshft_slptrgr_hld_dur_2 .25
trans_clthrtl_unlk_dly_uncnd 3
trans_min_TP_for_torque_mod 900

Adjust the transmission's shifting for my 4.10 gearing

trans_shift_schedule_12 X 0 0 152 200 252 332 500 668 668 1020 Y 13.5 13.5 13.5 23 35 43 50 51 70 70

trans_shift_schedule_21 X 0 0 0 0 152 300 452 724 724 1020 Y 8.5 8.5 8.5 8.5 8.5 10 27 35 35 35 trans_shift_schedule_23 X 0 0 0 100 200 332 500 668 668 1020 Y 24 24 24 24 50 68 70 70 70 70

trans_shift_schedule_32 X 0 0 0 0 352 400 452 724 724 1020 Y 21 21 21 21 21 45 55 65 70 70

trans_shift_schedule_43 X 0 0 0 0 252 276 400 668 668 1020 Y 27 27 27 27 27 55 90 107 112 112 trans_shift_schedule_34 X 0 0 0 100 252 332 500 668 668 1020 Y 40 40 40 40 94 103 112 127.5 127.5 127.5

These tables control when the convertor locks. I am told by Don of LaSota racing that the convertor should be locked shortly after the shift for best performance

trans_converter_lock_2nd X 0 0 0 0 0 0 0 200 252 1020 Y 99 99 99 99 99 99 99 30 30 30

trans_converter_unlock_2nd X 0 0 0 0 0 0 0 252 276 1020 Y 95 95 95 95 95 95 95 95 25 25

trans_converter_lock_3rd X 0 0 0 100 252 332 500 668 668 1020 Y 40 40 40 40 94 103 112 117 127 127

trans_converter_unlock_3rd X 0 0 0 0 0 0 0 176 236 1020 Y 35 35 35 35 35 35 35 35 39 39

trans_converter_lock_4th X 0 0 0 0 0 160 200 276 352 1020 Y 41 41 41 41 41 41 65 90 102 102

trans_converter_slip_2nd Entire table 0

trans_converter_slip_3rd Entire table 0

trans_TV_pressure_12 X 0 0 0 0 0 52 400 600 1020 Y 21 21 21 21 21 25 25 99 99

trans_TV_pressure_21 X 0 0 0 0 0 0 0 0 1020 Y 0 0 0 0 0 0 0 0 0

trans_TV_pressure_23 X 0 0 0 28 52 252 400 600 1020 Y 20 20 20 20 20 35 35 99 99

trans_TV_pressure_32 X 0 0 0 0 0 0 352 352 1020 Y 0 0 0 0 0 0 0 30 30

Changing AODE Shifting after a Gear Change

Two Ways to Do It

Found on the Internet

If you had a 2.73 gear, then went to a 4.10, use a factor of 1.5 (4.10/2.73).

  • Reduce the Trans21 and Trans32_Max_Pullin_Speed by the ratio of your new gear to your old gear.
  • Multiply "Base RPM to Vehicle Speed (VS) Ratio" by 1.5
  • Divide Trans_MNOSSPER by 1.5 Per SCT... in twEECer?
  • It's also not a bad idea to widen the range that the EEC can learn the N/V - I set min to 0.75 and max to 1.25

SCT's Way to Do It

4.10s
Scalar Value
Base N/V 50
Multiplier N/V 10.0
N/V Product 500
Min Learned N/V 1.25
Max Learned N/V 0.75
3.73s
Scalar Value
Base N/V 44
Multiplier N/V 4.0
N/V Product 176
Min Learned N/V 1.25
Max Learned N/V 0.75

After you do the above

You will also need to adjust your shift up/down and converter lock/unlock schedules. For these functions, divide all of your MPH numbers by 1.5. This will have you shift at the same RPM's as you did before the gear change. That will get you in the neighborhood. You can fine tune it from there.

You'll also need to adjust your shift points and rev limiters to keep out of your rev limiters at WOT. That's going to be trial and error.

Adding Automatic Settings to J4J1

I took my U4P0 and compared it to a J4J1 and also to a tune from eec-tuning.org - below are the changes to add the AODE pieces to the J4J1.

Once you add the automatic settings to the J4J1 you'll have to also set your IAC/TB settings, injector slopes, MAF transfer etc.

If you have a good description for what the items below do, please add them.

Note:

  • eec-tuning.org tune can be found here: [1]
  • J4J1 tune can be found here: [2]

Functions

trans_TV_pressure_21
X 0 0 0 0 0 0 500 652 1020
Y 0 0 0 0 0 0 0 -10 -10

Scalars

scalar value
EEC:Checksum Base Address 0
Fuel Shutoff Deceleration Minimum MPH 5 MPH
Fuel Shutoff Time Extended 10 Seconds
Fuel Shutoff Time to Enable 9 Seconds
stabilized_min_time 210
trans_2-1_pullin_max_speed 30
trans_TV_adder_34 16
trans_TV_adder_34_time 1
trans_base_RPM/VSS 44.5
trans_clthrtl_unlk_dly_uncnd 5
trans_default_stroke_timer 2
trans_dnshft_comp_tm_PO-43 1.5
trans_dnshft_comp_tm_PO-not43 1.5
trans_dnshft_slptrgt_hld_dur_2 0
trans_max_spdratio_uncnd_unlk .650024
trans_min_TP_for_torque_mod 240
trans_mnossper 535
Transmission Strategy 7 Switch
trans_torq_control_min_ECT 160
Transmission Load Type 6 Switch

Tables

No AODE differences found here.

Quicken and Firm up Shifts

Line Pressure

Entering higher numbers on the Y axis (Y axis = MPH) at each throttle position(X axis = TP) will firm up the shift at that TP) (these values might differ depending on which gears you have)

trans tv press 1-2
X 0 0 0 0 0 52 400 600 1020
Y 5 5 5 5 5 10 17 46 56
trans tv press 2-3
X 00 0 28 52 252 400 600 1020
Y -5 -5 -5 -5 0 8 8 27 42

Shift Time

scalar value
trans_tv_adder_12 16
trans_tv_adder_12_time 0
trans_tv_adder_23 16
trans_tv_adder_23_time0
trans_tv_adder_3420
trans_tv_adder_34_time1
trans_min_tp_for_torque_mod900 (to disable)
trans_torq_control_min-ECT250 (to disable)

Pictures

E40D, AODE, 4R70W Transmission Harness

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