Let the tinkering get serious!!....

[jazd]

I haven't seen an explanation of this high flow DPF. How do you plan on it working?

[GoLfMan]

if only you lived in Melb mate, I could TIG that up for you

[gldgti]

what are you going to do with that cone?

[DkN]

what are you going to do with that cone?

Isn't it obvious?

Put it on his head.

[Greg Roles]

I haven't seen an explanation of this high flow DPF. How do you plan on it working?

Experimental core, improved cannister outlet flow, get Gav to do the DPF delete tune ( and then some ), but with a non clogging DPF in place that doesn't need regen yet pulls much of the soot. All theory until proven.

[Greg Roles]

OK, after several test tankfulls, I'm convinced these really work, car just seems to be that bit more "peppy". I'm still as yet to put one in a clear container of diesel to actually ENSURE they actually totally dissolve, but after a tank with just Moreys smoke killer, then topping up with Moreys and three moth balls, the car was just that bit too powerful today.....hmmmmm.

Anything that raises octane is supposed to lower cetane, but man, it does indeed "feel" like it works....

I have read more than 5 balls per 50L can burn the oil off your bore during combustion, but that is probably with petrol, still I am sticking to three a tank, which is what comes out of the plastic hangers these come in. Be SURE you get the 990g/Kg ones, not the new alternate chemical ones, as it is the Napthalene you are after.

As always try at your own risk, and if your TDI blows up because you copied me, well you're a goose.

[h100vw]

Sounds like balls to me Greg!

[gldgti]

if theres moths in your fuel tank you're not driving your car enough.

[team_v]

Dear lord Greg, the lengths you go to in search of a tinker/power boost.

I honestly would be too scared to have tried that in my own car, kudos to you for having the guts to give things a go.

[jazd]

Experimental core, improved cannister outlet flow, get Gav to do the DPF delete tune ( and then some ), but with a non clogging DPF in place that doesn't need regen yet pulls much of the soot. All theory until proven.

Can you give some details of what this experimental core is? Is it going to have open ended tubes in it rather than the closed end ceramic tubes in the factory one?

[Greg Roles]

Partial flow mate, open ended, basically a big cat. Never blocks!

[gldgti]

Greg - I'm kind of confused where this is going. Sorry to be a pedant -

You are basically looking at replacing the DPF with a high flow cat. Nothing wrong with that per-se, but its not really going to function as a dpf anymore since the majority of soot will go through it just like it does through a cat.
By having 2 cats you'll trap more of the soot than you would with no dpf and 1 cat, for sure, but not anywhere near what the stock dpf catches, which we all agree is pretty much everything.

I guess the only way to know for sure will be to give it a try - and its great that you are. But, in my opinion, you'de likely acheive more with tuning in terms of soot reduction. (you probably already know this too - which is why i'm a little confused....)

Am I missing something? Is this mainly for lagalities sake?

[Greg Roles]

I'm going to give it a go, and see. Reality is always the bottom line.

It's not like a cat with chambers that are straight through, the "chambers are more hourglass like, but at a minimum the manufacturer claims 50% soot reduction, and it can be lengthened or a second one added to reduce even more - up to 70%. The stock closed cell DPF is supposed to remove 90% by comparison, and in reality the other 10% out of a stock DPF is too small to see.

So the net result worst case is 40% more soot out the back.

Add a decent tune, less soot, as you get the fuel rate more accurate. Tick.

Add extra cooling tinker efforts and you reduce the soot further. Tick.

Remove EGR, and soot is reduced quite a lot apparently. Tick.

Add water meth, providing even better burn and cooler charge - less soot. Tick.

I'm convinced in my case I can have a high flow DPF, produce next to no real visable particulates, still get all the NOX and SO reductions, and have power to boot. I would expect a bit on WOT acceleration, but hopefully it is like the 103 in that it is a very light haze at best.

It's a lot closer to legal, and depending on how it works will determine if I consider getting it approved - expensive and hard!!

In the least I will be able to get stock closed cell recores for the DPF's, so people can just retrofit a new one when the old one clogs, and I will have a hi-po oiler that doesn't belch black soot out the back, which personally I dislike.

[gldgti]

Thanks, that does clear it up.

[Greg Roles]

Hovex 99% Napthalene mothballs do indeed totally dissolve in Diesel fuel, tested it over the weekend in a glass jar.

Try at your own risk, but I love it, and 3 a tank is plenty for the effect, again more than 5 is apparently too much....