Rotorua Motor Works

08/10/2026

08/10/2026

Using the correct fuel in your vehicles is important

08/10/2026

The image shows an exploded, cross-section technical diagram of an automotive turbocharger system and its individual components.Core Components & FunctionsTurbine Housing & Wheel: Located on the hot side, high-pressure exhaust gases from the Exhaust Manifold enter here and spin the turbine wheel at speeds up to 150,000 RPM.Compressor Housing & Wheel: Located on the cool side, the spinning turbine turns a central shaft that drives the compressor wheel, sucking in fresh air through the Air Intake Pipe and compressing it for increased engine power.Bearing Housing & Bearings: Houses the journal and thrust bearings that support the high-speed shaft, supplied with continuous lubrication via the Oil Inlet and Oil Feed Line.Intercooler: Cools the compressed, heated intake air before it enters the engine, increasing air density and power efficiency.Wastegate Actuator & Valve: Regulates boost pressure by rerouting excess exhaust gases away from the turbine wheel to prevent

17/09/2026

Drive safe n have a wonderful weekend

02/09/2026

Three Luxury Icons ❤️‍🩹💯

02/09/2026

A beautiful car

07/08/2026

A service you can trust

05/08/2026

Why Your Car Jerks Between Gears

One of the biggest misconceptions is that harsh or jerky gear changes are “just how a modified car drives.”

They’re not.

On modern GM platforms, every gear change is a calculated torque event. Before the transmission applies the next clutch, the ECU predicts engine torque and commands a specific amount of torque reduction. If those calculations are wrong, the shift won’t feel right.

We regularly see cars where the airflow model hasn’t been calibrated properly after fitting a camshaft, OTR or headers. The ECU is calculating the wrong cylinder airmass, which means predicted engine torque is wrong before the transmission even starts the shift.

When the transmission receives an incorrect torque value, clutch fill times, pressure commands and torque reduction strategies no longer match what the engine is actually producing. The result is a harsh bang into gear, an inconsistent shift, or a flare between gears.

It’s not always the transmission.

It’s often the calibration.

That’s why we don’t just adjust shift pressure and hope for the best. We validate the MAF curve, VE model, predicted torque, delivered torque, Driver Demand, Electronic Throttle Control, shift timing, torque reduction and clutch apply strategy so the engine and transmission are working from the same data.

When everything is modelled correctly, the transmission knows exactly how much torque it’s receiving and the shifts become faster, cleaner and far more consistent under every driving condition.

A good transmission tune isn’t about making every shift hit as hard as possible.

It’s about giving the transmission accurate information so it can do its job properly.

09/07/2026

Happy Matariki to everyone have a wonderful weekend