20-02-2012, 12:12 AM
londondan86 Wrote:darrenjlobb Wrote:I seriously doubt you have any need for a lift pump in your setup kyle tbh....
Deffo dont run a hdi one, there way underpowered for any XUD application, anything over 4k and 200hp and you way out flow it....
You will need a super high flow external diesel pump and swirl pot for good effect...but will make no odds at all on your car if im honest? Only time you need them is when your revving them hard....any normal rpm range will be fine for chronic power with just the vane pump...provided your fuel system is free and clear...
So you don't recon one is needed at all then pre 200bhp. I have been really looking into this, got a random one here I have been playing with. I'm sure I am getting starvation issues after 5-5.5krpm, it wants to go but just hesitates and doesnt pull as strong that far up. (Could be the gov needing more shimms but not sure)
You run a T2 - revving past 4500rpm is farily pointless anyway, at least, your pump is going to deliver MORE than enough fuel in it's stock way to fuel a T2 to long past melting it...
Put it this way, my car doesn't need a lift pump, yes I'm running far less RPMs, but you shouldn't need one... Putting pressure into a VE pump COMPLETELY cocks them, it should be a last resort IMO. So unless you're swirl potting it, don't bother. And as Darren says, HDi lift pumps are useless past 200hp, if not before then TBH, the amount of fuel the VE bypasses is WAY more than a HDi, and the HDis have seen issues past 200hp, sort of 220hp, they're needing bigger pumps.
IMO before even touching lift pumps, you need to see what's actually going on, whether you're actually starving of fuel, by having an Internal Pump Pressure gauge... Only then will you know what's going on.