Engine · GM

GM LT: what the engine asks of an ECU

Page data last updated 2 October 2026

The Gen V LT looks like an LS from across the garage and is not one. Direct injection, a different factory ECU and different crank and cam encoding mean an LS setup is the wrong starting point.

This page covers the LT1 and the supercharged LT4.

Where this comes from

Some items on this page are cited from Wikipedia and from ECU manufacturers such as Haltech, not from the engine's maker. Each row names its source, and a † marks a row that is crowdsourced. Always check your specific sensors and manuals where you have them.

A figure like 58x is pulses per crank revolution from one sensor. It is a rate, not a sensor count, and it does not say whether the sensor is VR or Hall. The planner reads sensor type, cam sensor count and variable cams from the cited text. Where the text does not settle one, the row says so: check your sensor.

Variants

LT1 (Gen5 6.2 alum)

Engine
8 cylinders, V layout1
Aspiration
Naturally aspirated1
Fuel injection
Direct injection, sequential †
Ignition
COP, smart coils (igniter built in) †
Crank trigger
58x †
Cam trigger
4x (Gen5) †
Cams and variable timing
1 camshaft; variable timing: 1 (single-phaser); cylinder deactivation1 †
Firing order
1-8-7-2-6-5-4-3 †
Factory ECU
E92 †
Notes
Direct injection. The Gen V crank and cam encoding differs from Gen IV. †

† Crowdsourced. This figure comes from builder and parts-supplier pages, not from the engine's maker or an ECU manufacturer. Treat it as a lead, then check your specific sensors and manuals.

How the planner reads the trigger text

Crank sensor type
Hall †
Cam sensor type
Hall †
Cam position sensors
1
Variable cams
1

† Crowdsourced. US tuning shop listings show the Gen V LT crank and cam sensors as 3-wire (powered) Hall sensors, so they are not the 2-wire passive VR type. The crank sensor is also stated in Billy's Speed Shop: Crank and Cam Timing Sensors: Reluctor Ring Selection for LS, LT, and Coyote Swaps. Check your specific sensors and manuals.

Wire-in ECUs that cover it: 0 as they come, 29 more with add-on modules. The count is the planner's, worked out from the pin tables.

Fits with add-ons 29

Plan a build around the LT1 (Gen5 6.2 alum)

LT4 (Gen5 6.2 alum, S/C)

Engine
8 cylinders, V layout1
Aspiration
Supercharged †
Fuel injection
Direct injection, sequential †
Ignition
COP, smart coils (igniter built in) †
Crank trigger
58x †
Cam trigger
4x †
Cams and variable timing
1 camshaft; variable timing: 1 (single-phaser); cylinder deactivation1 †
Firing order
1-8-7-2-6-5-4-3 †
Factory ECU
E92 (later E99) †
Notes
Eaton 1.7 litre TVS supercharger. C7 Z06 and CTS-V. AFM hardware is present, but whether it is enabled varies by application. †

† Crowdsourced. This figure comes from builder and parts-supplier pages, not from the engine's maker or an ECU manufacturer. Treat it as a lead, then check your specific sensors and manuals.

How the planner reads the trigger text

Crank sensor type
Hall †
Cam sensor type
Hall †
Cam position sensors
1
Variable cams
1

† Crowdsourced. US tuning shop listings show the Gen V LT crank and cam sensors as 3-wire (powered) Hall sensors, so they are not the 2-wire passive VR type. The crank sensor is also stated in Billy's Speed Shop: Crank and Cam Timing Sensors: Reluctor Ring Selection for LS, LT, and Coyote Swaps. Check your specific sensors and manuals.

Wire-in ECUs that cover it: 0 as they come, 29 more with add-on modules. The count is the planner's, worked out from the pin tables.

Fits with add-ons 29

Plan a build around the LT4 (Gen5 6.2 alum, S/C)

Pairing the engine with a gearbox? BoxSelector has the ratios for the boxes that bolt up to it, and works out road speed and tyre size before the money goes: gearbox ratios.

Sources

  1. Wikipedia: General Motors LS-based small-block engine Wikipedia · LT4, Generation V

Always verify against the manufacturer's manual and your tuner before wiring.