FD Won\'t Start After Single Turbo Conversion

[gonzoninja]

Actually I Lie. It will start, sounds really rough as it tries to idle but then eventually dies. The rev counter gets up to 2000-2500 rpm.

I had a look at the injector duty and it was up to 22%!!! Since then I have backed off the FPR as I thought that could be choking it. It\'s now at about 35 psi with the vacuum advance on.

Fuel gauge has the warning light on. Previously I drained the tank and put in a gallon tank of super. Surely it doesn\'t need more than this in to run properly? It\'s a standard fuel pump so the pick-up should be okay.

[BlitzBoy]

Sounds like the vacuum line to the MAP sensor is disconnected or broken in some way

[gonzoninja]

I had a look at this and changed the Vac hose from the MAP sensor from some 6mm stuff to some 4mm, but it\'s still doing the same thing (I guess it is slightly better). Which way round should the filter go (or does it make a difference?) in the MAP sensor tubing? I\'ve got it so the fat end is furthest away from the MAP sensor.

If I keep the revs at 2500-3000 rpm then it will stay running.

if I take my foot off the gas then it\'s almost like its hunting, but really wildly from 2000rpm (where it sounds fine) down to 700 rpm where it stalls, but it has a couple of attempts of the hunting almost stalls carries on and then stalls.

There seems to be a lot of smoke coming from the exhaust, but I think this could be because it is running rich.

The other thing is do I have the throttle cable set up properly? There are two semi-circular things (I don\'t know their proper name) on the throttle body for the cable to attach to. I\'ve attached it to the outer one...but I\'m thinking when I took it off it was on the inner one. However when I came to re-attacg it last week the bracket with the holes in wouldn\'t let it fit properly.

[BlitzBoy]

I would change the vac hose back to the original for the time being, dont have the filter on the sensor tubing for the time being as well just in case its fduked.

I assume you have a Commander on your Apexi ECU, check the readings for boost on your commander make sure its reading correctly, if the reading is incorrect then you have found teh problem

The throttle cable position would not give you those problems

[gonzoninja]

Okay, well I\'m not sure what the boost should look like on a single turbo, but I think actually it may be sucking air from somewhere.

Before I switch anything on The Apexi and the boost gauge are reading a slight vacuum.

When I rev it the Vacuum increases. When I had twins I\'m sure it went to -500mg then started to get closer to atmosphere and positive boost as you revved it.

However, as it revs it is gaining in vacuum. i.e. not gaining any boost.

I know the turbo is spooling because its a ball-bearing turbo and I cn still hear it spinning when the engine stalls.

[BlitzBoy]

Ok so you are reading boost on the commander, do you have a boost guage as well do the readings match?

Have you changed anything fuelling wise?

[gonzoninja]

Yeah the boost readings are pretty similar.

Fuelling wise I\'ve got a new secondary rail with 1680cc injectors, I haven\'t programmed these into the commander yet as I wouldn\'t have thought they would affect the idle.

Changed the Fuel pressure regulator to an aeromotive one, which I\'m pretty sure is hooked up properly (fuel in - side port, fuel return - bottom port). The gauge on that is saying that the fuel pressure with the vacuum on it about 35-37psi, which may be a bit high.

I haven\'t changed the fuel pump.

Can\'t see, smell or hear and fuel leaks.

[BlitzBoy]

aha!! the base pressure is too high so running pig rich!

Ok your base pressure with engine switched off and vacuum line off the pressure reg needs to be 38psi, you can jump the wires on the diagnostic port to get the pump working when the engine is not on

[gonzoninja]

I\'ve backed off the fuel pressure to 35psi with no vacuum, it\'s now sitting at about 30psi with it attached. However the same thing is still happening.

Although it sounds a bit better and not so much like a tractor.

[BlitzBoy]

try about 27psi with the vacuum line on, although it wont matter change the seconday injectors on the commander to the maximum value of 1500

[gonzoninja]

Just had a look at the commander injector settings and it has 0cc for both.

That can\'t be right can it?! If a PFC is unplugged for a while it can\'t lose its settings can it?

I guess I should set these to the appropriate levels.

[BlitzBoy]

no thats defo not right.
Even if the ecu had reset itself it would default to original settings of 550 and 850.

Was this mapped originally by a tuner?

[gonzoninja]

hmmmm. Well I reset them to 550cc for primaries 1500cc for the secondaries and 100% Pulse correction value (as in the manual)

Cranked it and then it dies again.

Went back into the settings and the values had gone!

I have installed an FJO injector driver, but I don\'t think this would erase all the values in the the Power FC.

[BlitzBoy]

are all four injectors connected to the FJO?

[gonzoninja]

Yup. it should be able to drive both types of injector. Shaunwil has fitted his like this and doesn\'t have any trouble.