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The mkiv Supra Owners Club

uk upgrades on j-spec


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Is there much benefit in fitting uk cams injectors to a jspec or is it a waste if time. Is it a simple swap

 

Waste of time on stock turbos, the stock J-spec injectors supply enough fuel for BPU levels. If you were to fit UK injectors you would need some way of controlling the fueling, you would also need a resistor pack as the UK injectors are low impedance.

 

The exhaust cam is the same on the UK and J-spec, the inlet cam on the UK spec is slightly longer duration (J-spec 224°/UK spec 233°), but I doubt you'd notice much of a difference.

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and uk fuel pump?

 

If the car is still running the factory fitted J-spec pump, it would be a good safety measure fitting a brand new UK pump. They are expensive though to buy new and they also fit in the hanger differently, so they are not a straight swap.

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