Preventative replacemen of "weak link" parts prior to tune?

[TomC]

As the thread title suggests, what are people's opinions on replacing the parts known to be weak links at the same time as getting a tune done, given that the car will be about to experience increases boost?

I'm now close to getting the car tuned stg 1. It's been logbooked serviced and just had the 60k major done. But the car is about to tick over 60k. Do you think it would be wise of me to have parts such as the DV and PCV done at the same time as a preventative measure, keeping in mind that it will be much more of a hassle to have these parts replaced later if they fail not long after the tune is done.

Thoughts? Thanks

[Guy_H]

DV is a good idea, its under the car & a pain to get to & the new VW version is near bulletproof.

PCV is a little more expensive, but certainly worth checking. Just make sure the fuel filter has also been changed at the specified interval.

[TomC]

Thanks Guy. Is the PCV more expensive because it's harded to change (more labour)? Looking on Dubaddiction, for parts cost alone the replacement VW DV and BSH PCV S1 fix are similar price. You do hear people talk often about DV's and PCV's failing. Is it that common and therefore worth doing, or am I over-eager and better off waiting to see if I'm an unlucky one to have these parts fail?

The car has been logbooked serviced at the recommended intervals so should be no problem with fuel filter, spark plugs etc.

[Guy_H]

Hi Tom,

With the newer VW DV's, they are most robust & reliable - the older style (rubber diagram) had a habit of failing.

The BSH PCV fix actually eliminates part of the front PCV, its not a bad fix, but technically its not an upgrade (as to what it does - its a block off plate) - we find most PCVs die with mileage. The front PCV is on the front of the engine & easy to replace once you get your engine cover off.

There is a rear PCV which can also fail & leak (although not as common). I have not seen any after-market replacements for that.

If on a budget, do the DV first. Oh, check your service book for what has actually been replaced, we have seen stuff missed before!

[DNA Tuning]

If the car is in great shape at the moment and the engine delivery power smoothly and consistently, no error codes, healthy fuel trims, etc., then you shouldn't need to replace a bunch of parts. Drop by a dealer or someone who has VCDS to give the car a quick check and I think you should be alright!

Yes, the tune can reveal some weak links, but at least if it does, then you know which part to replace.

[TomC]

The BSH PCV fix actually eliminates part of the front PCV, its not a bad fix, but technically its not an upgrade (as to what it does - its a block off plate) - we find most PCVs die with mileage

Thanks fellas. So Guy, as you've said above, is the BSH kit an appropriate solution for a failed front PCV? Or is there a better option to repair it?

[Guy_H]

Technically, a new VW one is the go personally. The BSH works OK though.

[jbviajero]

Just out of interest - what is a DV - and a PCV?

[Guy_H]

DV = Diverter valve - it diverts the boost when it needs to.

PCV = Positive Crankcase Ventilation - part of the emissions system.

[jbviajero]

Ah ok thanks for that one