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Lucas Petrol Injection Tuning

Lucas Petrol Injection Tuning

 Tuning Lucas Petrol Injection (PI)

Tuning Lucas Petrol Injection (PI) is not something that can be done by any general garage or even most TR specialists. This is because the metering unit that determines how much fuel is delivered, has over 10 separate adjustments and adjusting one, will interfere with the effect of another. This means that without specialist equipment it is near impossible to get it right. If the engine, intakes, ignition and exhaust system on a particular car are all standard, then it is fair to say that an exchange metering unit will give reasonable results, but even better results can be obtained if the metering unit and ignition are tuned correctly.

RevingtonTR are particularly well known for their work on Lucas mechanical Petrol Injection. This is why.

Virtually no TR is standard these days especially as the 5* leaded fuel the cars were designed to run on is no longer available therefore the metering unit especially needs to be adjusted to meet the needs of the unique engine/ignition/exhaust combination in every car.

RevingtonTR have unique facilities that allow us to tune Lucas PI to provide fuelling from the metering unit that is unique to your engine and intake /exhaust system.

There are 3 elements to our process of tuning the metering unit.

1. Our hugely experienced technicians in our workshop have been tuning Lucas PI for a combined total of over 35 years.

2. We have a rolling road capable of  absorbing 800 Horse Power.

3. We have the (unique to us) computer modelling program shown to the right which allows us to load in the dimensions of the metering unit allowing the program to draw the fuelling curve shown (actually a series of straight lines as the metering unit is mechanical).

The Process 

 When a car enters our workshop for this work our first objective is to be certain that the engine is in good shape, will not blow up and is capable of being tuned to achieve best performance and economy. Once this has been established the car is run on the rolling road and figures taken of inlet vacuum (it is this vacuum that the metering unit uses to establish what fuel to deliver) against exhaust gas quality at various throttle/power settings. The metering unit is then removed, stripped and the internal setting measured. the dimensions are then fed into our computer model which will draw the fuel to vacuum curve. This is compared with the exhaust gas analysis results and then the model can be adjusted to achieve more ideal fuelling. 

The metering unit is then rebuilt with these new settings and returned to the car for another run. If all is well the fuelling will be correct but as this is not a precise process it may be that the new settings are 85% correct and the process will need repeating to fine tune the settings.

Once this process has been followed the engine will run sweater, produce more power and use less fuel. What's not to like! 

Lucas PI was used on Maserati and race cars too which can benefit from this process.