My 1992 GTI

**j2k4** · 07-23-2015, 09:36 AM

Jebus...serious ugliness, Doc.

**DocWalt** · 08-07-2015, 09:44 AM

So... I swapped oil pumps and bearings again last Friday night. I just wired up/installed a VDO oil pressure gauge last night:

This is at a warm idle (1300rpm), oil temps around 190 degrees F. At 212 degrees F the pressure drops to about 17psi. If I drop the idle speed to 1000rpm the pressure drops to about 12psi. Since this gauge's sender replaced my low pressure warning switch (two post sender, one to the gauge, one to trigger the factory oil pressure warning system) I'm not sure that's correct as the oil pressure warning light should be flickering since it's set at 12psi on this sender's low pressure warning sensor.

**DocWalt** · 08-15-2015, 10:35 PM

Autocross today.... I need to replace my lifters or run heavier oil. They're not staying pumped up and my car sounds like it has a mild misfire until the oil gets cold and pumps them up again... I can't hear it in person but it sounds very obvious listening to the videos on my phone... Anyway.

Here are my 6 runs. My fastest was my 5th. My 6th run was faster but I nudged a cone in the box near the start. It never even fell over!

**DocWalt** · 08-15-2015, 10:35 PM

**DocWalt** · 08-16-2015, 05:01 PM

I did an oil change this morning to 20w50 Brad Penn racing oil (I had 10w40 Brad Penn in it) and gained ~5psi at idle. As long as it keeps the lifters happy I'm happy. I'm betting I need to replace lifters over the winter anyway

Some good news though... The oil I took out had ~500 miles on it since I did the pump and bearings. I found absolutely no metal in the oil. No metallic dust, no flakes, just clean oil

**Uniuno** · 08-18-2015, 02:55 PM

I put VDO gauges in my car, oil temp, pressure, and coolant temp. I have a difficult time trusting them. I have the LCDBC and watch my coolant temp with it as well as the gauge. The LCDBC will show coolant at 195 pretty steady and the VDO gauge is all over the place between 210 and 220. If the coolant gauge is that far off, how far off are the others?

**DocWalt** · 08-18-2015, 03:29 PM

Originally Posted by Uniuno

I put VDO gauges in my car, oil temp, pressure, and coolant temp. I have a difficult time trusting them. I have the LCDBC and watch my coolant temp with it as well as the gauge. The LCDBC will show coolant at 195 pretty steady and the VDO gauge is all over the place between 210 and 220. If the coolant gauge is that far off, how far off are the others?

Reviews online are saying that the VDO gauges are notoriously inaccurate. Up to 20psi off on an oil pressure gauge... Completely unacceptable. I'll change to a STACK once this dies or it falls out of the gauge cup again (it's not a 52mm as advertised, 52mm is the outside diameter of the face

)