had it on my ED30, massive difference in midrange torque no noticeabke difference in fuel consumption unless you use the extra all the time
What does a high pressure pump exactly do?
Are they difficult to install?
Which ones would you recommend?
it allows more fuel to be injected when the standard one runs out of capacity.
so with a tweak to the remap, you can hold boost bit longer and gain more torque / bhp as a result.
but fitting one without a remap is pointless.
and yes, i wouldn't try doing a DIY install on a HPFP.
recommendations? APR / KMD / AWE / Autotech all do HPFP kits. APR's one is a complete fuel pump done at their factory, so costs more.