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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old September 19th, 2017, 14:37   #31
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Location: Southeast Kentucky
Default Comparing Inside Diameter of OE vs SS Braided Hose

I have practically everything it takes to build an ALH engine. I've looked at possibilities for an oil feed tube/line/pipe over to the Turbo for this future engine...

Below, are pics of the OE tube vs the eBay SS Braided Hose. Can someone assure me (us) the smaller diameter SS Braided Hose will provide adequate oil for the Turbo?

Below, is a comparison of the SS Braided Hose end at the Turbo (sorry about the focus). It appears the fitting in the Turbo is roughly the same size as the SS Braided Hose inside diameter (ID).

Below, or is the ID of the SS Braided Hose the same size as the fitting in the Turbo?

Experienced hands, tell us what you think!
'84 Vanagon '02 ALH TDI engine Malone Stage 1 tune. CAT, SS 2" exhaust, E-vac system, DMF with upgrade pilot shaft, 4.57 R&P, fan assisted IC. (32 to 35+ MPGs consistently)
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Old September 19th, 2017, 14:53   #32
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Fuel Economy: 50/45/37

I had a conversation with our Garrett tech support rep the other day in reference to a PD turbo that had failed. The reason for failure was "insufficient oil flow" causing excessive heat and eventual turbo failure. What was interesting to me about the conversation was that the Garrett rep talked about oil flow, not pressure. He said that pressure can be fine but if flow is inadequate the turbo will overheat.

We don't carry braided hoses because I could never be sure that they would flow enough oil to support a warranty claim if a car with one has a failed turbo. We know that the OE lines do flow enough oil. And honestly, OE lines, when installed properly, work fine for a long time. I've replaced the oil feed line once in my wagon over the course of 350K miles and 4 turbos. And it hadn't failed. I just thought I wouldn't tempt fate by using the one that came with the car during the most recent turbo install.
2002 Jetta wagon, 362K, RC3+; 1993 Mercedes-Benz 300D 2.5, 197K; 1997 Passat, 285K; '99.5 Golf, 257K; 2011 335d, 56K; 2015 Golf Sportwagen, 8K. Principal, http://www.idparts.com
Kid's cars: 2002 Golf TDI, 2002 Jetta TDI
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Old September 19th, 2017, 22:33   #33
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After reading this thread, I am content with the braided oil feed line I recently purchased from KermaTDI. It doesn't use the banjo fitting. I'm guessing it provides just as much flow or more than the stock tube type line.

2005 Golf GLS TDI
2010 Jetta TDI(sold to VW)
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Old September 20th, 2017, 14:00   #34
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Thorp, I agree that a straight fitting on a braided oil line will not restrict the
flow if it maintains the hose's ID. Using high-pressure hydraulic fittings and
adapters with smaller ID's might create a restriction, though.
2002 Jetta GLS TDI wagon, 2012 Audi A3 TDI S-Line
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