Released Updated Shiftlogic Automatic Transmissions 4.37

Xupaun · May 12, 2025

Found the issue. Its the Better start mod.

DaddelZeit · May 12, 2025

Xupaun said: ↑

Found the issue. Its the Better start mod.
Click to expand...

This might be related to the variable idle RPM. Is there a behavioural difference between a cold and a warm engine?

Xupaun · May 12, 2025

DaddelZeit said: ↑

This might be related to the variable idle RPM. Is there a behavioural difference between a cold and a warm engine?
Click to expand...

I started with the engine cold, but on an Warm ambient temperature. I tried to heat the engine up by driving on the rollers with brakes on. With the cold engine, no creep, but when the engine warmed up to about 55° the creep returned, although not really smooth. Overall the idle is jerky, and so is the creep in extension. Tested today the engine warmth thing

piz · May 24, 2025

is there a way to fit cherrier 9-speed to etk 800 (or any other car)

Xupaun · May 25, 2025

piz said: ↑

is there a way to fit cherrier 9-speed to etk 800 (or any other car)
Click to expand...

By "Cherrier 9 speed" you mean the behaviour, the gear ratios, or the mere fact that it is a 9 speed? Because the bahaviour is about the same (other than the shift points, that are dependent of the engine) as the Bastion's 8 speed auto, i.e. a bit smoother than the ETK's. Although the Torque Converter is very different. If you want a 9G-tronic equivalent, It can be done, but unnoficially.

Xupaun · Jul 30, 2025

The previous version had a wrong file in it. This is the fixed version

default0.0player · Jul 31, 2025

I got an error that prevents me from uploading the fix.
Anyway I uploaded here.

default0.0player · Aug 1, 2025

default0.0player updated Updated Shiftlogic Automatic Transmissions with a new update entry:

Removed unused file

Removed unused file, thanks @Xupaun for discovery.
Click to expand...

Read the rest of this update entry...

V1ldsvin · Oct 19, 2025

Another guy made 2 logic mods for manual and sequential transmission and made a guide to make it universal for all manual and sequential gearboxes in the game, at least the ones using the vanilla logic. Is it possible to make this happen with this mod aswell? Im no expert on the area, i know a little. The guy with the mods just made it seem so simple.
Thanks in advance

Xupaun · Oct 19, 2025

V1ldsvin said: ↑

Another guy made 2 logic mods for manual and sequential transmission and made a guide to make it universal for all manual and sequential gearboxes in the game, at least the ones using the vanilla logic. Is it possible to make this happen with this mod aswell? Im no expert on the area, i know a little. The guy with the mods just made it seem so simple.
Thanks in advance
Click to expand...

Yes but there's some catches.
First, this mod adds variables that the Vanilla logic mod doesn't have, so vanilla transmissions wouldn't have them either. The means that you'd not have some of the advancements of this mod.
Second, That could generate compatibility issues and duplicates of transmissions.
At the end, this mod has a tutorial of how to use its shift logic on other mods. If modders don't bother using it, it's a shame

Fy42145 · Oct 20, 2025

I just found this video

V1ldsvin · Oct 20, 2025

Xupaun said: ↑

Yes but there's some catches.
First, this mod adds variables that the Vanilla logic mod doesn't have, so vanilla transmissions wouldn't have them either. The means that you'd not have some of the advancements of this mod.
Second, That could generate compatibility issues and duplicates of transmissions.
At the end, this mod has a tutorial of how to use its shift logic on other mods. If mother's don't bother using it, it's a shame
Click to expand...

Where do i find this tutorial? would love to try it. I cant seem to find it in the post.

Xupaun · Oct 20, 2025

default0.0player said: ↑

Modding:

In order to make a good transmission, both the non-modded and the modded jbeams need to be tuned carefully.

Note:It is allowed to implement my transmission into your mods as long as you credit me AND RENAME the lua files to avoid mod conflict.

Non-modded contents:
The following jbeams are non-modded, please refer to the BeamNG official wiki for further information.

For the following vehicleController jbeams, refer to the VehicleController wiki.
lowShiftDownRPM, highShiftDownRPM, lowShiftUpRPM, highShiftUpRPM, gearboxDecisionSmoothingUp, gearboxDecisionSmoothingDown, aggressionSmoothingUp, aggressionSmoothingDown, calculateOptimalLoadShiftPoints, useSmartAggressionCalculation, wheelSlipUpThreshold, wheelSlipDownThreshold, transmissionShiftDelay, transmissionGearChangeDelay, neutralSelectionDelay, aggressionHoldOffThrottleDelay, defaultAutomaticMode, maxGearChangeTime, minGearChangeTime, sportGearChangeTime, throttleCoefWhileShifting, torqueConverterLockupRate, torqueConverterLockupInRate, torqueConverterLockupOutRate

Classic Automatic Transmission:
Classic automatics lockup the torque converter based on the gear you are in. In low gears the TC is unlocked for torque multiplication and smoother ride, and in higher gears(often the highest) the TC is locked. Between them, the TC is partially locked, where throttle input is taken into consideration, the higher the throttle, the later the lockup.

To use the classic automatic, DO NOT use the "amtIdleThrottle" or "torqueConverterlockupIdleCoef" jbeam.
Use the "shiftLogic-automaticGearboxLogicmod.lua" and rename it to something like "shiftLogic-automaticGearboxyourmodname.lua"
In the "vehicleController" section of your gearbox:
Set "shiftLogicName":"automaticGearboxyourmodname"
"torqueConverterLockupMinGear" Below this gear, the TC is always unlocked.
"torqueConverterLockupFullyMinGear" At or above this gear, TC is always locked regardless of throttle(high throttle will only lead to downshift)
Between these gears are lockup RPM based on throttle input
"torqueConverterDelayLockupMinThrottle" Below this throttle value, the TC lockup RPM is at the lowest
"torqueConverterDelayLockupMaxThrottle" Above this throttle value, the TC lockup RPM is at the highest
Between these throttle value, the lockup RPM is interpolated.
"torqueConverterLockupRPM" This is the engine RPM where the TC starts to lock when the throttle is low
"torqueConverterThrottleLockupRange" This is the RPM increase where the throttle is high
For example, if the "torqueConverterDelayLockupMinThrottle" is 0.2, "torqueConverterDelayLockupMaxThrottle" is 0.4, the "torqueConverterLockupRPM" is 1500, "torqueConverterThrottleLockupRange" is 1000 and the throttle is at 30%, then the lockup RPM is at 2000. For "torqueConverterLockupRange" still refer to the wiki.
For gearbox and torqueConverter hardware tuning, refer to the BeamNG wiki, respectively.

Modern Automatic Transmission:
Modern automatics typically lockup the torque converter based on vehicle speed, in this type of AT the TC lockup is barely noticeable.

To use the modern automatic, use the "torqueConverterlockupIdleCoef" jbeam. It "activates" the modern AT logic.
Use the "shiftLogic-automaticGearboxLogicmod.lua" and rename it to something like "shiftLogic-automaticGearboxyourmodname.lua"
In the "vehicleController" section of your gearbox:
Set "shiftLogicName":"automaticGearboxyourmodname"
DO NOT use the "torqueConverterLockupMinGear" or "torqueConverterLockupFullyMinGear"
Use the "Powertrain Visualization" UI app and put your mouse to the gearbox or the transfercase to read the gearbox's output shaft RPM
"torqueConverterLockupRPM" This is the gearbox output RPM where the TC starts to lock.
"torqueConverterLockupRange" at a given throttle, this is the range between zero to full lock force.
"torqueConverterThrottleLockupRange" This is the lockup RPM range when the throttle RPM is high.
"torqueConverterDelayLockupMinThrottle" Below this throttle value, the TC lockup RPM is at the lowest
"torqueConverterDelayLockupMaxThrottle" Above this throttle value, the TC lockup RPM is at the highest
Between these throttle value, the lockup RPM is interpolated.
Adjust the "torqueConverterlockupIdleCoef" since the TC lockup is controlled by gearbox output shaft speed, when the gear is too high and the speed is above the lockup speed the engine might stall. When the idle RPM is 700 and the "torqueConverterlockupIdleCoef" is set to 1.2, the TC will unlock if the engine is at or below 840 RPM
"modernATRevThrottle" This value sets the rev-match throttle during down shifts to further reduce the shifting. During coasting/engine braking, pay attention to the Wheel Torque(use the Engine Info UI app), during downshifts, the Wheel Torque is further negative, increase the "modernATRevThrottle" to reduce the torque. Use slow motion to watch the downshift wheel torque, if it's more than twice as much as engine braking wheel torque, the "modernATRevThrottle" is too low, if it's positive rather than negative, the "modernATRevThrottle" is too high.

Single Clutch Transmission:
As already explained, the SCT is a workaround, based on AT mechanism, which does not transfer any torque during gear change and have rev-match like the gameplay throttle assist.
Use the "shiftLogic-automaticGearboxLogicmod.lua" and rename it to something like "shiftLogic-automaticGearboxyourmodname.lua"

In the "gearbox" section, set both "oneWayViscousCoef" and "shiftEfficiency" to zero, this makes the gearbox unable to hill hold and doesn't output any torque during gear change
In the "torqueConverter" section, set the "converterDiameter" to zero, this effectively removes the torque converter, leaving only the clutch. Set the "lockupClutchTorque" to twice as much as the engine max torque. Set the "lockupClutchSpring" to 2000 or higher and set the "lockupClutchDampRatio" to 0.3 to 0.7, this makes the clutch less slushy.
In the "vehicleController" section, set "shiftLogicName":"automaticGearboxyourmodname" and set "torqueConverterAMTRevMargin" to "activate" the SCT logic, the value is about the rev-match accuracy, set higher to make the gearbox more clunky, set lower to make the gearbox less jerky upon clutch engagement, a value of 0.02~0.05 is appropriate.
Although the SCT has a clutch, the jbeam is still named "torqueConverter" because I'm lazy and didn't rename them in the lua.
"torqueConverterLockupInRate" this dictate the clutch disengagement speed in 1/second, the value should be set higher than "torqueConverterLockupOutRate" and higher than 10. The quicker the transmission, the higher the value.
"torqueConverterLockupOutRate" this dictate the clutch engagement speed in 1/second, The quicker the transmission, the higher the value.
"torqueConverterAMTCreep" this value sets the creep, for example if this value is 0.05 and the clutch torque is 500 then the creep is 25 Nm.
"torqueConverterAMTBrakeThreshold" when the vehicle is stopped and applied brake is higher than this value, the clutch fully disengages(no creep).
"torqueConverterLockupFullyMinGear" this value must be set to "autoDownShiftMinGear" + 1, otherwise the gearbox may behave weirdly.
"torqueConverterLockupRPM" is value dictates the starting RPM where the clutch starts to engage(aside from creep).
"torqueConverterLockupRange" this value plus "torqueConverterLockupRPM" dictates the RPM where the clutch fully engages when the throttle is low.
"torqueConverterThrottleLockupRange" this delays the clutch engagement with this RPM when the throttle is high.
"torqueConverterDelayLockupMinThrottle" throttle below this value does not delay the clutch engagement.
"torqueConverterDelayLockupMaxThrottle" throttle about this value fully delays the clutch engagement.
"amtIdleThrottle" this is the very low throttle during upshifts, to prevents RPM drop too much to below the RPM of the next gear. to set this, shift to N and use a tiny bit of throttle(1%~5%) manually, when the RPM is above idle RPM and below the "lowShiftDownRPM", then the "amtIdleThrottle" should be set to this throttle value.
"amtRevMatchMinThrottle" this sets the rev-match throttle during downshifts when the aggression is low, should be set to above twice as much as "amtIdleThrottle" and below "amtRevMatchThrottle".
"amtRevMatchThrottle" this sets the rev-match throttle during downshifts when the aggression is high.
"amtRevMatchMaxThrottle" this is the max allowed throttle during kickdowns(driver applies high throttle to force downshift) to prevent overrev, should be set to higher than "amtRevMatchThrottle".

Dual Clutch Transmission: coming soon

Shifter Modes are the same in classic/modern AT, SCT and DCT
Winter mode:
In "PRND21" shifter layout, set the "automaticModes" to "PRND21W" or "PRNDW1"
In "PRNDSM" shifter layout, set the "autoDownShiftMinGear" to 2 or 3 to allow the driver to pull away in M2 or M3, respectively. Do NOT use the "autoDownShiftInM" jbeam.
Crawler mode:
Set the "krawlerGearIndex"(use a negative integer) for reverse crawler and "crawlerGearIndex"(use a positive integer) for forward crawler gear
Put BKCH in the "automaticModes" you may or may not want to remove the R and D modes depend on the gearbox's application.
B is for skipping the reverse crawler gear(s), K for only use reverse crawler gear(s), C is for only use forward crawler gear(s) and H is for skipping the forward crawler gear(s).
For example: 4AT with OD-OFF, set "crawlerGearIndex" to 3 and "automaticModes" to PRNDC21, then the C is the OD-OFF gear.

Electric Motor: Coming s∞n
Click to expand...

Here

singletongavin49 · Dec 31, 2025

can you add one for the md series I wish I can mess with my torque converter on the how I want to

singletongavin49 · Dec 31, 2025

add one for md series

Louie's Workshop · Dec 31, 2025

singletongavin49 said: ↑

can you add one for the md series I wish I can mess with my torque converter on the how I want to
Click to expand...

singletongavin49 said: ↑

add one for md series
Click to expand...

Why did you say that twice?

singletongavin49 · Jan 10, 2026

Louie's Workshop said: ↑

Why did you say that twice?
Click to expand...

dont know

wardragon · Jan 17, 2026

I agree, inclusion of the MD-series would be wonderful.
Does anyone know if someone is carrying out development after the OP paused it due to his difficulties?

Xupaun · Jan 18, 2026

wardragon said: ↑

I agree, inclusion of the MD-series would be wonderful.
Does anyone know if someone is carrying out development after the OP paused it due to his difficulties?
Click to expand...

I am. I'm just kind of busy lately.

Oyster · May 21, 2026

Any updates on the.. update?
Apologies for bumping, I'd just hate to see this mod go

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Released Updated Shiftlogic Automatic Transmissions 4.37

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