Quick overview: This post explains how the Ferrari F1 / Lamborghini E-Gear / Maserati Cambiocorsa robotized manual system works, with a deep focus on the hydraulic gearshift actuator—including the two internal actuators, selection vs engagement, and EV solenoid logic.
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In this article you’ll learn:
- What the F1/E-Gear “robotized gearbox” system is (and what it isn’t)
- The 6 key components that make the system operate
- How the actuator performs selection vs engagement
- Which solenoids control which movements (EV1–EV5)
- How the potentiometers confirm actual gear position to the ECU
Related Technical Articles
- Maserati vs Lamborghini E-Gear Actuator Housing Swap: The Ball Pivot Geometry That Ends In Failure
- E-Gear / F1 Actuator Potentiometers: Selection vs Engagement (What They Do and Why They Matter)
Description
Let’s start with a basic description of what we have in these F1/E-Gear cars as a whole. This is commonly called a robotized gearbox control system. It is not a conventional automatic transmission (even though many cars have an “Auto” mode).
At its core, the gearbox is a standard manual transmission. It has shift forks and internal gearsets just like a normal 3-pedal car (clutch, brake, and throttle). The difference is that instead of the driver physically moving the shift mechanism and clutch, those actions are performed by a highly advanced electro-hydraulic control system.
In other words, the system is an electro-hydraulic servo system that manages both gearshift and clutch operation.
There are about 6 parts to this system as it relates to the gearbox and how it shifts:
- 1.) Gearbox
- 2.) High Pressure Pump (commonly called the F1 pump or E-Gear pump). Pair this with the hydraulic reservoir, since the pump draws fluid from it.
- 3.) Power Unit (valve block): 6 solenoid valves, pressure sensor, pressure relief valve, check valve, and bypass screw.
- 4.) Hydraulic Pressure Accumulator (stores pressure like an air compressor tank stores compressed air).
- 5.) Hydraulic Gearshift Actuator (physically moves the shift forks based on solenoid control).
- 6.) NCR / Gearbox Control Unit (the ECU that controls the entire system using driver inputs and vehicle parameters).
Today we are focusing on the Hydraulic Gearshift Actuator itself.
Hydraulic Actuator
The actuator’s job is to move the gearshift forks in order to drive both engagement and selection. In simple terms: it shifts the car the way you would shift a manual transmission car.
Example: You’re sitting at a stop sign in neutral in a 3-pedal car. You push in the clutch, then move the shift lever into 1st gear. What you don’t see is the external linkage/gear rod at the transmission pushing or pulling shift forks internally. The actuator in these systems performs that same job—just hydraulically and electronically.
Let’s look at photos to ground this in the real hardware.
The top photo shows the gearbox where the hydraulic actuator mounts. You can clearly see the shift forks through the opening and how they line up with the actuator’s armature below. In this example, both the actuator and gearbox are in neutral.
Parts of the Actuator
I don’t know how clear the picture above is, but it works for a high-level overview. Major parts include:
- Actuator housing assembly (note: there are actually two internal actuators even though the diagram doesn’t show both)
- Cam
- Hairpin duct
- Gearshift command shaft
- Bushing
As pressurized fluid is released by the solenoids, it travels through the high-pressure lines to the top of the actuator housing. This is often the least understood part of the actuator.
A quick terminology note
In this post, I use “actuator” two ways:
- The actuator as a whole (the housing/assembly)
- The two internal hydraulic actuators inside the housing that do the actual movement
Now let’s identify and explain the two internal actuators.
A quick look at the photos above: the two brass objects are the two actuator end pieces with seals retained by “C” clips. The diagram earlier only shows the smaller of the two.
Smaller internal actuator (selection): This actuator provides the turning/rotating action of the gearshift command shaft through the hairpin duct. It controls selection (sometimes described as “clocking”) of the actuator finger.
Analogy: In a 3-pedal car, this is like moving the shifter across the gate—from the 1–2 plane, to the 3–4 plane, to the 5–6 plane. You are positioning the finger where it needs to be before the gear is actually engaged.
Larger internal actuator (engagement): This actuator provides the horizontal movement that actually engages the shift forks. Once you’ve selected the correct shift fork, this actuator moves the command shaft left/right (or forward/back depending on orientation) to engage the gear.
More photos:
Above is the larger actuator that isn’t shown in the earlier diagram. It’s the one that has the hairpin duct attached (see the lower of the two photos).
In the top photo you can see two brass-type end caps and the outer seals that retain pressurized fluid in the chambers. This actuator remains attached to the gearshift command shaft, but it unbolts at the location of the inner C-clip shown in the photo.
The lower photo also shows the cam of the upper actuator that turns/clocks the gearshift command shaft through the hairpin duct. Here are more photos of the upper (smaller) actuator.
Internally, the seals and layout inside the housing are very similar between the smaller and larger actuators. The difference is the function each one provides when hydraulic pressure is applied.
Selection and Engagement
Selection: The gearshift command shaft has 4 possible positions separated by 15-degree angles it can rotate to. Selection is the rotary movement that aligns the finger with the correct shift fork. The smaller actuator converts fluid pressure (from the selection solenoids) into rotary movement to position the finger. The gear selection solenoids are EV3, EV4, and EV5.
Engagement: Once the finger is aligned with the desired shift fork, the command shaft must move to engage that gear. This is done using stored pressure in the accumulator, activated by solenoids directing pressure to the larger internal actuator.
The finger has three possible engagement states: Odd gears, Even gears + Reverse, and Neutral. The engagement solenoids are EV1 (Odd gears) and EV2 (Even gears + Reverse). Both EV1 and EV2 on together command Neutral.
This all happens extremely fast. There is typically at least 580 psi (40 bar) in the system during operation, and pressure can rise to approximately 725 psi (50 bar) as the pump cycles at the beginning of a pressure recharge event.
Now let’s get into how this works with pictures.
The photo above shows the top of the actuator where the high-pressure lines are banjo-bolted to it. Note: On Ferrari and Lamborghini these actuators are positioned upside down relative to how you’d typically see them on a Maserati.
To orient you: the black “Selespeed” dust cover is usually on the right side of the photo. Here’s what it looks like installed:
You can see the 6mm nut size on the smaller actuator hanging out there. The position shown is how it would look installed on a GS/4200/Quat gearbox, looking down from above. On Lamborghini and Ferrari they sit differently and the hydraulic lines to the chambered openings are reversed.
There are 5 banjo bolt holes (pressure ports). Starting at the top, left to right, the three holes are (Maserati-specific, not Gallardo). If you’re comparing housings or planning a housing swap, read this first: Maserati vs Lamborghini E-Gear Actuator Housing Swap: The Ball Pivot Geometry That Ends In Failure.
- EV#3 solenoid valve high pressure line hole
- EV#4 solenoid valve high pressure line hole
- EV#5 solenoid valve high pressure line hole
Left to right on the bottom are:
- EV#1 solenoid valve high pressure line hole
- EV#2 solenoid valve high pressure line hole
Here’s how it works in the vehicle:
- Neutral selected and engaged: EV#1, EV#2, EV#3, EV#5 ON
- 1st selected and engaged: EV#1, EV#3, EV#5 ON
- 2nd selected and engaged: EV#2, EV#3, EV#5 ON
- 3rd selected and engaged: EV#1, EV#3, EV#4, EV#5 ON
- 4th selected and engaged: EV#2, EV#3, EV#4, EV#5 ON
- 5th selected and engaged: EV#1, EV#4, EV#5 ON
- 6th selected and engaged: EV#2, EV#4, EV#5 ON
- Reverse selected and engaged: EV#2 and EV#3 ON
Relating this back to the photo above: the three top holes (EV3–EV5) feed the smaller actuator that performs selection/clocking (up/down rotation of the command shaft finger). The two bottom holes (EV1–EV2) feed the larger actuator that performs engagement (left/right movement of the command shaft).
Since the actuator I photographed was damaged, I can’t show the full movement of the top/smaller actuator clocking the hairpin. However, I can show the lower actuator movement as a general reference.
The middle position would be Neutral (“N”). You can see where the bottom actuator arm is sitting. Both EV#1 and EV#2 must be ON to achieve this.
This would be Even gears engaged: EV#2 ON pushes the engagement actuator fully to the right.
This would be Odd gears engaged: EV#1 ON achieves all odd gears.
Potentiometers
For a deeper breakdown of the two position sensors and what they report, see: E-Gear / F1 Actuator Potentiometers: Selection vs Engagement (What They Do and Why They Matter).
You might be wondering: what tells the NCR (gearbox ECU) that the hydraulic actuator is actually in the gear it selected and engaged?
The hydraulic actuator is equipped with two passive sensors designed to monitor the actual position of the actuator finger. One sensor monitors the selection stroke while the other monitors the engagement stroke. These are hall-effect sensors that convert the output signal of the hall element into a 0–5V DC signal.
If the NCR doesn’t receive the appropriate signal, it can disable the car as a safety feature. That same signal is also used to display the current gear to the driver on the dash indicator.
Here are two photos showing those potentiometers removed from the actuator housing:
Here is where they sit:
If you look at how the potentiometer armatures sit in the bottom photo, there is a groove in the gearshift command shaft where both armature legs sit. When the command shaft is rotated (clocked), it pushes on the “shift” (selection) potentiometer. When the command shaft is pushed left to right, it operates the “gear” (engagement) potentiometer.
Mail-In Actuator Rebuild Services
If you’ve made it this far, you already understand why these systems require precision—selection vs engagement, EV solenoid logic, and accurate position feedback. If your actuator is worn, leaking internally, or failing calibration, I offer mail-in rebuild services for Ferrari F1, Lamborghini E-Gear, and Maserati Cambiocorsa actuators.
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