Hi guys

I've just finished rebuilding the gearbox and turbo and installed the MSD wasted spark kit 3 weeks ago and gave it some beans this weekend but noticed some blue smoke coming out the rear and noticed that the oil pressure was coming down when on boost.
All these readings were done with the engine hot and oil at about 100ºC and I'm using 100% synthetic 10w60 oil (it's 40ºC here in Portugal):
I'm getting 45psi on boost (at 4000rpm for example) and when I let go the throttle (still geared) the oil pressure goes up to 55psi. If i give it throttle again it goes down to 45psi.
I had to put oil in the car this weekend (the dip stick was at the lowest) and I haven't done more than 350 miles since it was full.
I have a racetech capillarity gauge.

Could this be a faulty turbo? Main bearings? oil pump? all of them?

Can someone help me on this one? I'm getting a bit desperate now... I've had the car for 17 years now but it's becoming more and more frustrating. There is always something terribly wrong with it... I'm about to give up on him...

Thanks, André

 

What type of measuring device are you using?
Is the gauge electronic or capillary?

There is no reason for the oil pressure to drop once it has climbed through bearing clearance, it might be that electronic (if it is electronic) gauge has a poor sender or a bad connection.
Any oil pressure issues I always remove the sender and fit a known good mechanical oil pressure gauge to confirm.

I am coming to Portugal in two weeks, sorry I won't be travelling with my oil pressure testing kit :0

 

Its a racetech capilarity (mecanical) gauge

First time in Portugal? hope you like it.

 

I think racetech do both electric and capillary.
Does your guage have a pipe on it?

 

Yes, it has a pipe, it's a capillary one!

 

How much oil is it using? Litres per km?

 

I would say it used at least half a liter in 500km