đ„ Darylâs LLT SV6 â Before & After Dyno-Proven Performance đ„
- Dec 18, 2025
- 2 min read
When it comes to extracting real-world performance from Holdenâs LLT SV6, the key is addressing factory restrictions and backing it all up with proper dyno tuning. Darylâs SV6 is a perfect example of how the right combination of hardware and calibration can completely transform how the car drives.
𧩠The Problem with a Stock LLT
From the factory, LLT engines are held back by restrictive exhaust components, conservative ECU torque management, and intake limitations. While theyâre reliable, they leave a lot of usable power and drivability on the tableâespecially in the mid-range where these cars spend most of their time.
đ§ The Revhigh Upgrade Package
To unlock the SV6âs true potential, we fitted:
Heat-coated headers to improve exhaust flow and reduce engine bay heat
Resonated downpipe for smoother flow and refined sound
Orssom OTR intake to dramatically increase airflow over the stock intake
2.5â catback exhaust to complement the headers and downpipe
Custom ECU & TCU dyno tuning to correctly manage torque, throttle, and shifting
Every part was chosen to work together, not just to make peak power, but to improve drivability and response.
đ Dyno Results â Before vs After
The numbers speak for themselves:
Before Tune:
161.6 kW @ 178
354.8 Nm @ 172
After Revhigh Tune:
191.9 kW @ 222
408.6 Nm @ 138
Thatâs a massive gain in mid-range torque, which means stronger acceleration, smoother power delivery, and a car that feels faster everywhereânot just at the top of the rev range.
đ How It Drives Now
The biggest improvement isnât just the peak figuresâitâs how the SV6 behaves on the road. Throttle response is sharper, the power comes on earlier, and the gearbox works in harmony with the engine thanks to the TCU tune. Itâs now a far more engaging and enjoyable car to drive daily.
đĄ Final Thoughts
This build shows why dyno-backed tuning and properly matched parts matter. No shortcuts, no generic filesâjust proven results and a better-driving car.
If youâre running an LLT SV6 and want real gains you can feel, this is the difference a proper setup makes.
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