Originally Posted by Wardy257
Originally Posted by SafeChav
Because the relays in MFi cars and alike firstly are very primitive and poorly made, but not only that they are all very under-rated. I dont think theres a MK3/4 on the planet that hasnt melted its relay, as soon as the pump gets a bit old and starts drawing a little more current they just burn out. They are rated 16A which is BORDER LINE for requirements.
The relay on an EFI car is rated at 30A, so there is A LOT less chance of failure/fire
The tachometric relays are more advanced than the later relays, hence 'tachometric'. I fuel pump should only draw 4 amps, so a 16 amp rating is not a problem. If your pump starts drawing more than 10 amps your pump is the problem, not the relay.
Yes i am aware the relay in an EFI car is just an industry standard SPST relay, but in terms of quality and reliability it is SUPERIOR to the tachometric items in MK3/4's.
Surely if a tachometric relay was so technologically advanced compared to an ECU cars today would still use them - which they don't.
Tachometric relays are cheap pieces of shit used to overcome the problem of not having an ECU on an MFI car.