This is a curious one...
My TR6 has had a Neil Ferguson recon metering unit & PRV coupled with a Bosch pump conversion..Its run absolutely fine for the last five years and continues to do so. I have a meter measuring PSI just before the metering unit.
I have a PSI of around 103-105 when the ignition is switched on..When the engine starts and the engine is revved hard (but not under load) I see that the PSI rises up to as much as 120PSI before falling back. to 103-105 on idle.
Any ideas why this should be the case..I realise most of the concerns around PI is about low pressur