tempted to wash mine out now! but worried about rust? if you whack it back on fast and go for a good drive it should dry out fast enough though?
Yes, normal running temperature is over 200C, it's over 120C when ticking over so it will boil off. I was thinking of mixing some saltpetre in water and spraying that in. But i thought better of it because as it releases it's oxygen it could also burn with any iron. Plus saltpetre is corrosive if residues are left behind.
I haven't mentioned that i also tried hydrogen peroxide (just a 9% mix), it gets hot and releases oxygen too, but i think the concentration needs to be higher for there to ba a big effect.
But to be honest, plenty of soapy water is safer and gave me an improvement as good as the Wurth aerosol did. I think the potential for blocking up again is pretty high though, because the water doesn't run through the upper 2/3rds of the filter.
Do DPFs really need to be replaced as often as I've just started to read?
I don't think so. Mine appears to be completely original, with 132k miles on it now. I could replace it for £300, so felt comfortable enough drilling it out. After hearing the force of the gasses coming out of the temperature sensor hole, I could tell immediately that the pressure before the DPF was ridiculously high. Looking back I should have just put a gas pressure gauge on it to see what difference in pre-dpf gas pressure the core reduction gave me.
To give a rough indication of the sort of pressure I'm talking about, I have red chip gravel on my drive and when I revved the car with the temperature sensor removed a few chips blew out from the drivers side with in cloud of dust.
Thinking about it now, it could be quite a simple way to check if your car has a significant blockage. It's impossible to quantify what sounds like too much pressure, but I guess if you're shocked by just how much pressure there seems to be when you've removed the temperature sensor (with a 17mm open spanner) then you've got a blocked DPF too.
I suppose mine should have been calling a DPF error, but then again it was still driving, sluggishly. I checked that the dpf warning light functions on the dash today using AlfaOBD and it does work, so I really have no idea how bad things must be able to get before an error is declared.
Autolusso have stopped offering DPF removals I think? others are still doing them?
Have they ? I haven't asked them recently.
Let's be honest, a DPF delete was always cheaper than a new DPF and their services make it a very attractive option. Perhaps because the price of new DPF's has come down substantially the potential of doing deletes over straight replacements must decline.
Hats off to all tuners who have helped people out with deletes so far though, especially where they've gone to the trouble to make replacement pipes, because it's good engineering isn't it, and I'm all in favour of it. Perhaps drilling out seems like bodge, but, with the cost of a new DPF being almost affordable for another 50k (at least - estimated) of driving I didn't think there was too much to lose. And now I've no plans to buy a DPF or get a delete because I'm happy with this result.