Now, I know a lot of people reading this don’t have a turbo-charged engine.

But that does not mean that they wont in the future.  So even if you don’t currently run a turbo engine, you still may find this email of interest.

A lot of high powered turbo cars have too much power in the lower gears.  This can actually make the car slower than if it had less power, as the driver needs to spend more time reducing engine power (with his right foot), than getting on with the job of driving.

Using Road Speed as a reference to map boost with allows you to optimize engine power at different speeds.

To do this, you will need an ECU with a wheel speed input, and the ECU will need the ability to map the boost valve position vs road speed or wheel speed.

Most EFI cars have an electronic speedo, so you can pick up on that for your wheel speed.

That is a pretty quick and easy way to get wheel speed into your ECU, but it does not address one thing.  That the “driven wheels” may be spinning at 100 kph, but the vehicle is actually standing still.

So, to get the best (and most accurate) result, you would be best to have a wheel speed sensor on an “undriven” wheel.

That will show the real road speed, and allow you to maximize your vehicle’s acceleration so you can concentrate on winning the race, beating the time, or just having more fun.

As a side note, you can also map boost against throttle position to have the engine power delivered in a more linear manner as you open the throttle.

PS: If you have any specific questions about turbo boost over road speed, you can contact us at wolfemail@wolfems.com.au