8 replies to this topic

[eden7842]

hey

just got my turbo engine running today, idles fine but if i rev it up above 2700 rpm it dies

any ides?

cheers eden

[MRA]

That sounds like you haven't fitted the correct fuel pump and / or fuel regulator.... as the engine comes on boost it requires 4psi above boost pressure, therefore what I suspect is happening is that the bost is pressurising the fuel back in to the carb

[eden7842]

this is what i thought ive got the turbo reg but a facet comp fuel pump which i assume will not give enough fuel pressue?

[Wil_h]

What fuel pump and regulator you have has no impact on the fuel pressure in the carb. Keeping the fuel pressure 3psi above boost pressure just allows it to get into the float bowl. The float bowl its self is pressurised via a hole through to the plenum. The restrictor ring in the plenum ensures that the float bowl is kept 3psi above the charge in the carb.

A common problem is that the wrong gasket is fitted between the plenum and carb blocking the pressure feed to the float bowl.

The other is that the restrictor ring has been removed.

With the pump that you have (if everything else was right) it would run fine until the float bowl emptied.

[MRA]

So wil h what fuel pump are you running ?

I have always used a Bosch fuel pump.... as per Rover MG Mtero Turbo and ERA Turbo Mini, which does deliver the pressure for your application.

[Wil_h]

Yeah, you need to use an roller vane type injection pump, I have a used a selection of pumps, generally rated between 45 and 60psi.

As I say, with a normal carb pump (that would deliver 4 to 5 psi) your car will run, but it'll quite quickly run out of fuel in the float bowl, so it'd be a s good as useless. The pump does not pressurise the float bowl, more overcome the pressure in the float bowl.

[MRA]

this is what i thought ive got the turbo reg but a facet comp fuel pump which i assume will not give enough fuel pressue?

The facet pump will not work with a turbo "blow through" installation, the fuel delivery pressure needs to be about 4psi above the boost pressure therefore if you wish to run 20psi of boost then you need a pump that can deliver 24psi minimum at the regulator / carburettor.

The Metro turbo was / is a "blow through" installation.

In your case the boost pressure is going higher than the fuel pressure, it is "leaning" off your mixture (which is potentially lethal to an engine) and eventually your engine will have such a weak mixture that it can no longer run

Edited by mra-minis.co.uk, 11 April 2010 - 06:41 AM.

[lawnmowercrap]

this is what i thought ive got the turbo reg but a facet comp fuel pump which i assume will not give enough fuel pressue?

The facet pump will not work with a turbo "blow through" installation, the fuel delivery pressure needs to be about 4psi above the boost pressure therefore if you wish to run 20psi of boost then you need a pump that can deliver 24psi minimum at the regulator / carburettor.

The Metro turbo was / is a "blow through" installation.

In your case the boost pressure is going higher than the fuel pressure, it is "leaning" off your mixture (which is potentially lethal to an engine) and eventually your engine will have such a weak mixture that it can no longer run

Its my old pump he's running. I had to get rid of it because it kept over pressurising my Filter King. It was running around 8-9 PSI unregulated when I had it around 4 months ago.

[eden7842]

right ive swap my pump to a metro one but the pump is broken so ive got to get a new pump so i can get it running again.