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BlownByTwins

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  • Mk4 Supra
  • R35 GTR
  • Tech & Tuning
    • Engine ManagementReference articles on ECU calibration, air modelling and engine control. Car-agnostic technical writing: the maths, the measurements, and the failure modes. Applies to any standalone platform, not just the cars on this site.
  • Partners
    • Tuning
      • SRD Tuning
      • MK Auto Repairs and Tuning
      • Litchfield
    • Wheels
      • Vossen
      • Rays Wheels UK
    • Engine Parts
      • Emtron
      • Pulsar Turbo
      • Rajab Racing
    • Interior
      • Corbeau Seats
  • Car Clubs
    • JDM Heroes
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    • R34 GTR
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What the Logs Changed in My Supra Traction Control
Posted inEngine 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…
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Erratic Shifts and Idle Overfuelling on the 2JZ: Finding a DBW Feed-Forward Fault
Posted inEngine 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.
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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
Posted inEngine 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…
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Mk4 Supra Zestek Steering Wheel Adapter Failure: Downshift Paddle Not Working
Posted inMk4 Supra

Mk4 Supra Zestek Steering Wheel Adapter Failure: Downshift Paddle Not Working

The Zestek steering wheel adapter on my Mk4 Supra has suffered another downshift paddle failure. This is now the third failure in 15 months on a £1,400 + VAT product.…
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Mk4 Supra | Isle of Man 2026
Posted inEvents and Meets Mk4 Supra

Mk4 Supra | Isle of Man 2026

In May 2026, a select few of use went off to the Isle of Man for a few days higher speed fun. A break from Scotland this year. And to…
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Mk4 Supra: The 3.4 Stroker Build
Posted inMk4 Supra

Mk4 Supra: The 3.4 Stroker Build

If you've been following this build from the start, you'll know the plan was always to go 3.4 stroker. The 3.0 on the G40-900 was never the finished article. It…
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Supra Rolling
Posted inEvents and Meets Mk4 Supra

Scotland with slap! Adventures

The annual pilgrimage to Scotland with slap! Adventures took place in May, back it is usual time after the 2024 May trip to Monaco. As usual, I had the car…
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Mk4 Supra – Big Brake Kit (BBK!)
Posted inMk4 Supra

Mk4 Supra – Big Brake Kit (BBK!)

Back in November, I realised I was going to need a brake upgrade on the Supra, given the performace increase I was going to having, both now and scheduled for…
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Posted inMk4 Supra

Mk4 Supra – Rival Worx TRD Style spoiler

For Black Friday, 2024, I ordered the Rival Worx TRD Style rear spoiler for the Supra. On the website, it says 3-4 weeks for delivery. Perfect. Get it for Christmas,…
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Mk4 Supra – JapFest at Silverstone 2025
Posted inEvents and Meets Mk4 Supra

Mk4 Supra – JapFest at Silverstone 2025

The first outing in anger with the Supra on the new wheels and tyres, with the new single setup. It was a brilliant drive out. I met up with a…
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Recent Posts

  • What the Logs Changed in My Supra Traction Control
  • Erratic Shifts and Idle Overfuelling on the 2JZ: Finding a DBW Feed-Forward Fault
  • Traction Control on 1,114 whp: Feedforward, PID, and Why It Never Cuts
  • Twelve Small Injectors Instead of Six Big Ones
  • Staggered Tyres and Traction Control: What the ECU Corrects, and What It Can’t

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