Haltech Ti8HP Explained: ZF 8HP Control and How It Compares to the Ti4L and Ti6L

Haltech Ti8HP: The ZF 8HP Comes to the Nexus Ecosystem

Haltech is previewing the Nexus Ti8HP at the SEMA Show 2026. It is a transmission interface that pairs the ZF 8HP eight-speed automatic with a drive-by-wire Nexus ECU, and it is the third Ti unit after the Ti4L for GM 4L automatics and the Ti6L for GM 6L automatics. This article covers what Haltech has confirmed, what the 8HP is and which versions are supported, how the Ti8HP compares to the earlier Ti units, and what we expect from the launch based on how those went.

What Haltech has confirmed

• It is an interface, not a transmission controller. The 8HP's own control unit still makes the shift decisions. The ECU supplies what the gearbox needs, such as engine torque, and the Ti8HP handles the connection.
• No third-party flashing tools. The Ti8HP reads the original gearbox binary and flashes the Haltech binary through the Haltech system.
• Plug and play harness. The included pre-terminated harness plugs into the transmission connector on Haltech's terminated harnesses (Rebel LS, Rebel JZ, Rebel K, R3 Barra, R3 RB). It can also be wired into any other drive-by-wire Nexus ECU or VCU.
• Runs as per factory out of the box. You adjust the prefilled torque table, then tune shift feel from the ECU: torque value (line pressure and clamping force), shift load correction, upshift torque reduction and downshift throttle opening. Transmission fault codes show on the ECU.
• Planned later: trans brake, clutch control and custom shift points. Gen 2 gearbox support is also planned.

The ZF 8HP in brief

ZF launched the 8HP in 2009 in the BMW 7 Series, and it has since become one of the most widely used longitudinal automatics in the world, behind BMW, Audi, Jaguar Land Rover, Toyota and Stellantis products. Stellantis builds licensed versions under the TorqueFlite 8 name for Ram, Jeep, Dodge and Chrysler. That spread is exactly why it is such a popular swap transmission: it is common in wrecking yards, it takes serious torque in the larger versions, and it shifts fast.

Two design details matter for anyone running one on a standalone ECU:

• The control unit lives inside the gearbox. The 8HP uses a mechatronic unit, with the TCU integrated with the valve body. That is why the Ti8HP talks to it rather than replacing it.
• No one-way clutches. Every shift is a clutch-to-clutch handover, so every downshift needs the engine to blip the throttle and match revs. Haltech gives this as the reason the Ti8HP needs a drive-by-wire ECU and why T series ECUs are not supported.

Which 8HP do you have?

The number in the model name is roughly the torque class in newton meters: an 8HP45 is in the 450 Nm class, an 8HP70 in the 700 Nm class, and an 8HP90 in the 900 Nm class. ZF updated the family in generations, and the model names changed with them.

How the Ti8HP compares to the Ti4L and Ti6L

The three Ti units look like a family, and they share a price, but they do not all work the same way. The big split is whether the transmission has its own computer.

So the Ti8HP is a direct descendant of the Ti6L, not the Ti4L. Both keep the factory shift logic and adaptive learning, both depend on the ECU reporting accurate engine torque, and both remove the need for an outside flashing tool. The Ti4L is the odd one out: on a 4L60E or 4L80E the Nexus is the transmission controller, which is why its kit includes a line pressure sensor for closed-loop pressure control.

Haltech has also done factory-TCM integration with ZF before. The Elite Pro Plug-in for the Ford Falcon I6 supported the ZF 6HP26 six-speed by talking to its factory TCM, with the TCM sending torque reduction requests back to the ECU. The Ti8HP applies the same idea to ZF's eight-speed, packaged as a standalone box that works across the Nexus range.

Why a separate box instead of a CAN port

The 8HP's control unit talks CAN at the OEM rate of 500 kb/s, while Haltech CAN runs at 1 Mb/s, so they cannot share a bus. Without the Ti8HP you would have to give up one of the ECU's CAN ports to the gearbox. With it, that port stays free for the rest of the car: ABS, a BCM, a factory dash or other devices.

Ti8HP versus TurboLamik and other 8HP controllers

Until now, running an 8HP behind a Haltech usually meant a third-party TCU such as TurboLamik. TurboLamik replaces the 8HP's internal TCM with its own board in the mechatronic unit and takes full control of the solenoids, with no OEM programming left in place. The trade-offs look like this:

• Ti8HP: keeps the factory TCU and its adaptive logic, no opening the mechatronic, one plug-in harness, everything tuned and logged from NSP, US$450. Trans brake, clutch control and custom shift points are not there at launch.
• Full standalone TCU: total control of shift points and solenoids from day one, but the mechatronic board has to be replaced (TurboLamik offers this as a service) and the gearbox is tuned in a second piece of software.

For a street car or a mild build that should drive like the factory car, the Ti8HP is the simpler path. For a drag car that needs a trans brake now, a standalone TCU still makes sense until Haltech adds those features. Our Haltech knowledge base has setup guides for TurboLamik and CANTCU with Haltech.

What we expect at launch

• Binary coverage will be a list. The Ti6L launched with a published list of known compatible TCM operating systems and a note that unknown versions exist, with Haltech adding support for new ones when customers send in the binary. Expect something similar for the 8HP, given how many vehicle-specific calibrations there are across BMW, Stellantis and others.
• Firmware minimums. TCM reflashing on the Ti6L needs minimum NSP, ECU and Ti6L firmware versions. Plan on updating NSP and your ECU firmware before the first flash.
• A setup wizard path on Rebel. The Ti4L and Ti6L are selected in the Rebel LS setup wizard and NSP configures the ECU automatically. With the Ti8HP plugging into the Rebel LS, JZ and K harnesses, we expect the same treatment there.
• The torque table matters. On the Ti6L, Haltech says the Torque Model must be enabled and eventually tuned to real dyno numbers. The Ti8HP uses torque to set line pressure and clamping force, so a torque table that is too low on a built engine risks clutch slip, and one that is too high makes shifts harsh. Budget dyno time to get it right.
• Flash with a stable supply. The Ti6L warns that losing power during a TCM reflash can leave the transmission inoperable. Use a battery charger and keep the laptop awake for the Ti8HP too.

Frequently asked questions

Can I pre-order the Ti8HP?

Haltech has not opened pre-orders yet, but our listing is open. Orders ship when Haltech releases it, currently targeted for the first quarter of 2027.

How much is the Ti8HP?

Haltech expects US$450 excluding sales tax, the same as the other Ti units, and that includes the pre-terminated harness.

Does the Ti8HP work with a Nexus T1 or T2?

No. The 8HP needs a throttle blip on every downshift, so Haltech requires a drive-by-wire ECU with electronic throttle control set up. Nexus R series, S series, Rebel and Plug-in ECUs are supported.

Will it work with my Supra A90 transmission?

The A90 shifter is supported. The A90 gearbox is an 8HP51, a later generation than the Gen 1 units supported at launch.

Does it work with Gen 2 8HP transmissions?

Not at launch. Haltech says Gen 2 support is planned for later.

Do I need to wire anything?

Not on a Nexus Rebel or R3 terminated harness with a transmission connector. On other drive-by-wire Nexus ECUs or VCUs it wires in. Either way, you need a brake pedal input to the ECU.

Planning an 8HP swap?

Tuned By Shawn is a Platinum Haltech dealer with in-house wiring and remote tuning. If you are putting an 8HP behind an LS, JZ, Barra or anything else on a Nexus, send us your engine, gearbox tag and shifter before you buy parts and we will spec the full list.

Sources: Haltech, "Haltech is previewing the Ti8HP at SEMA 2026," November 2026; Haltech knowledge base articles on the Nexus Ti4L, Nexus Ti6L, ZF 6 Speed Support and 8HP control using TurboLamik.