john, Author at BlownByTwins

Boost Control on the Emtron KV12: Where the Target Really Comes From

How boost is controlled on the Supra's Emtron KV12: a base table that never asks for boost, a user offset that does, a deliberate clamp, and a PID kept on a short lead so the feedforward does the work.

Close-up of two Plazmaman fuel rails on the intake runners, each feeding six injectors, one row nearer the cylinder head than the other

Engine Management Mk4 Supra

Staged Injection on the Emtron KV12: A Blend, Not a Switch

How the Emtron KV12 stages twelve CP1000 injectors on the Supra: every table that controls the handover, what the logs show, and where the secondaries sit uncomfortably close to their minimum pulse width.

Block diagram of the Emtron KV12 cruise control path from speed error through the cruise PID, TMF and DBW to the engine, with front axle average speed as feedback

Engine Management Mk4 Supra Tuning

Tuning Cruise Control on a 1,000+ bhp Toyota Supra

How to read a cruise control log on a torque-based Emtron KV12: one sample log from a 2JZ Supra, six checks that derive what P, I, D and base torque are really doing, and the formulas to redo them for your own gearing.

Illustration of an empty European road at dusk with a 130 km/h speed limit sign and the title Speeding in Europe

General

Speeding in Europe 2026: What UK Drivers Actually Risk

Speeding fines, licence bans and criminal thresholds for UK drivers in nine European countries in 2026, plus whether a camera fine will follow you home after Brexit.

Engine Management Mk4 Supra

Tuning VVT-i Properly: From Chasing Errors to an Oil-Temperature-Compensated PID

How oil temperature changes what the 2JZ-GTE's VVT-i controller needs, and the path from fixed feed-forward to an oil-temperature-compensated PID on the Emtron KV12.

Engine Management Mk4 Supra Tuning

What the Logs Changed in My Supra Traction Control

The previous version of the traction control worked. That was the problem. It worked well enough to make a 1,114 whp Supra feel calm, so the remaining faults were hidden…

Engine Management Mk4 Supra Tuning

Erratic Shifts and Idle Overfuelling on the 2JZ: Finding a DBW Feed-Forward Fault

Inconsistent torque, delivery and shifts, with nothing obvious in the log. Working outwards from the symptom into the DBW loop, and the arithmetic that showed the integrator was spending its whole authority cancelling a feed-forward error.

Chart of permitted wheel slip against lateral G for three traction control settings, each forming a dome that peaks in a straight line and tapers as cornering load builds

Engine Management Mk4 Supra Tuning

Traction Control on 1,114 whp: Feedforward, PID, and Why It Never Cuts

1,114 whp, 880 lb ft, and a 295 section road tyre on the back. Traction control on this car is not a driver aid. It is the thing that makes…

Chart of injector flow against rail pressure showing a square root relationship, so an injector rated 1,000 cc at 3 bar flows 1,155 cc at 4 bar rather than 1,333

Engine Management Mk4 Supra Tuning

Twelve Small Injectors Instead of Six Big Ones

Every big power build hits the same wall. You need enough injector to feed the engine at full noise, and the injector that does that is too big to idle…

Bar chart comparing raw wheel speed channels reading 2.8 percent apart against a corrected Drive Slip channel reading zero at steady cruise

Engine Management Mk4 Supra Tuning

Staggered Tyres and Traction Control: What the ECU Corrects, and What It Can’t

If you run staggered tyres and a standalone ECU with traction control, there is a field in your configuration that almost certainly matters more than you think it does. It…