1Z Mtdi Boost

[rodpaslow]

I have a quick question - I have above with a 2252 turbo in it, stock injectors with only 2-3 psi of boost under accel, no smoke at all.  I've turned the pump up as high as I can without it hanging.  Will moving up to .216 (I have in my possession) help the boost issue?

(pump is a bit of a hybrid, 1.9 case with LRover pump internals and head, vw valves from head to injector lines).

Thanks

[vanbcguy]

What kind of EGTs are you seeing?  If you are smoke free then you probably have room for more fuel.  Is your LDA connected and working?

You can definitely go bigger on your nozzles.  I'm running .275s on my AHU M-TDI.

[rodpaslow]

I'm see egt's around 900-950°F, I can't feel it pulling hard at top end at all, and that's were I'd expect more with the 2252.  LDA is connected - I can't confirm if it's working - but if I'm only getting 2-3 lbs of boost it's not going to add much, if any.  I'm just not sure where to start. 

Will moving the throttle arm another position stop it from hanging so I can increase more on the fuel screw?  Will stock injectors put enough fuel through to actually create boost?  I think maybe put the .216's in and see if it helps as well?

[rodpaslow]

I've got a crappy boost gauge in it, I'm waiting for a VDO with kit.  Once it's installed I can get an accurate number.  I also have low oil pressure when warm-however another crappy gauge-changing to VDO as I have one in my other car I trust (0-80 psi gauge).

I checked aux shaft before I  put engine in car, and seemed tight, no movement.  Has anyone had issues with mains and rods being worn and causing oil pressure issues, or is it just the oil pump?

[bbob203]

Thats a massive turbo. I would get something bigger than .216.

[rodpaslow]

"Intermediate shaft bearings and/or the seal on the oil/vacuum pump drive shaft are common causes of low oil pressure." - from another post.

What does the oil/vacuum seal have to do with causes of low oil pressure.  Are we talking the seal between the pump housing o-ring to engine block?  Vane type pump in 1Z.

[vanbcguy]

I'm see egt's around 900-950°F, I can't feel it pulling hard at top end at all, and that's were I'd expect more with the 2252.  LDA is connected - I can't confirm if it's working - but if I'm only getting 2-3 lbs of boost it's not going to add much, if any.  I'm just not sure where to start. 

Will moving the throttle arm another position stop it from hanging so I can increase more on the fuel screw?  Will stock injectors put enough fuel through to actually create boost?  I think maybe put the .216's in and see if it helps as well?

OK - so you still have room for more fuel with just the air you've got already.  Which is somewhat surprising given the low boost numbers you are seeing - this implies the pump isn't putting out all that it should especially if you have the fuel screw all the way in.  Larger nozzles might help a bit but you should be able to get your EGTs up over 1300F+ with stock nozzles and the 11mm Rover pump head.

I'd be a bit concerned that your pump isn't doing what it is supposed to personally.  Mixing parts between different pumps without some way of verifying the pump's operation afterwards is pretty tricky.  Given you have low EGTs and no smoke my feeling is that you have a fueling issue.

[rodpaslow]

I guess I need a bit of help with turning the fuel screw in.  Currently it's about where my 1.6 pump sits and if I floor it I can make a pretty big cloud behind me - so I think you are correct in your post-not enough fuel.

Is the proper procedure to undo the nut holding the throttle onto the spline, back it off a spline or two and turn up the fuel screw more so that it doesn't hang when the screw is only about half way in?

[sdubfid]

is your wastegate sealing?

[rodpaslow]

It's a new turbo, so it should be, but I need to double check that.

I will be pulling the pan first to check my oil pump and bearings before checking that as the oiling issue must be fixed first...

[libbydiesel]

"Intermediate shaft bearings and/or the seal on the oil/vacuum pump drive shaft are common causes of low oil pressure." - from another post.

What does the oil/vacuum seal have to do with causes of low oil pressure.  Are we talking the seal between the pump housing o-ring to engine block?  Vane type pump in 1Z.

The seal between the oil pump and the vacuum pump has nothing to do with the block and is not an o-ring.  It is a seal that resides in the bottom of the oil pump gear and seals around the oil pump shaft.  The oil pump shaft is hollow and allows pressurized oil to flow up to the vac pump.

[rodpaslow]

So is this seal in the bottom of the oil pump replaceable? I imagine you have to goto VW if it is?

[libbydiesel]

I typed that incorrectly.  It is in the bottom of the vacuum pump gear not the oil pump.  If you pull the vacuum pump out of the engine and look up into the gear you will see it. 

[rodpaslow]

I found a good resource on vwvortex - http://forums.vwvortex.com/showthread.php?5129625-Diesel-Vacuum-pump-rotary-vane-type.

I think the oil pressure problem for me will be dealt with like they suggest.

[rodpaslow]

two questions - can intermediate shaft bearings be changed with engine in car and where to buy a tool to change them.?

Just looking into this if the oil pressure doesn't improve after pulling pan and changing pump, check vac pump seals, etc.