pod filter

[mikinoz]

ok so honestly i want the pod filter for the flutter noise...
but i was told you need a BOV for that noise
and BOVs are illegal unless they are pump back...
are these both true?
i have the the tissshhh noise in the golf but only very quietly so does that mean it has a bov on it or something else?

mikinoz you said you had put a pod filter ondone this...
do you get the flutter?
what sort of vw do you have?
is it turbo'd?
cheers

Ok - I get both induction and wastage noise - also a louder spool of the turbo.

I have been stock this week and the response of the engine is dramatically reduced.

I will need to get some time and put up a video/audio clip for you.

[Greg Roles]

Well I thrashed the bejesus out of it all morning, and it didn't miss a beat. I figured if it was going to run incorrect fuel ratio's and throw an error, several 5000 rpm attempts would do it.

No problems, runs as per usual, and I can find no errors at all on Vag-ina-com. I concur that Modshack is correct in that the grid is only required if you run the stock box with the 90 degree lid, to even out the airflow.

Now, onto the exhaust.......

I wonder if an active DPF bypass for full throttle applications would be possible once we get a way to outsmart the DPF sensors. I think that would be best of both worlds. I plan to visit a local reputable exhaust shop for some new muffs / loss of that huge rear one, and I'll see what they think.

Rock on the home mods.

[gregozedobe]

I wonder if an active DPF bypass for full throttle applications would be possible once we get a way to outsmart the DPF sensors. I think that would be best of both worlds. I plan to visit a local reputable exhaust shop for some new muffs / loss of that huge rear one, and I'll see what they think.

I love reading about the plans of the audaciously ambitious

I'm sure it is mechanically possible to dynamically bypass the DPF (maybe operated by some kind of pressure sensor on the exhaust or a switch that senses full throttle like an old style automatic gearbox kick-down switch).

However, integrating non-DPF mode with the engines exhaust control electronics may be more challenging. Maybe it is worth trying a really cheap non-DPF "bodged together" exhaust setup to see if there are any real gains to be had by removing the DPF ? If it only gains you 2-3 Kw it won't be worth all the trouble and expense of doing it properly, but at least you'll know for sure.

If all it does without the DPF is throw engine error codes but it runs OK you could just do the crude thing and ignore them and later reset with vag-com). If it puts you in limp home mode then you will need to delve deeper.

Please keep us informed.

[Greg Roles]

Greggo, sounds like a good idea to fab up a temporary delete and dyno it. Would settle a lot of arguements! My brother is quite the welder too...hmm.....

I do like the idea of keeping the DPF for 90% of driving is pottering around, and to just have a straight through for the odd traffic light grand prix. I figure that'd be the most intelligent comprimise. Once a delete kit comes out, turning those electronics on and off with the bypass would be relatively straight forward. Helps that my old man is an electronics guru though!

My other thought is that bigger DPF's if not already out there will be forthcoming from VW, and perhaps upgrading to one off a Tourag or something would give a much lower pressure drop whilst doing the right thing. I'd pay to do that. I'm going to stick with the DPF until some options arise, and take it from there.

[Logzy]

Greggo, sounds like a good idea to fab up a temporary delete and dyno it. Would settle a lot of arguements! My brother is quite the welder too...hmm.....

I do like the idea of keeping the DPF for 90% of driving is pottering around, and to just have a straight through for the odd traffic light grand prix. I figure that'd be the most intelligent comprimise. Once a delete kit comes out, turning those electronics on and off with the bypass would be relatively straight forward. Helps that my old man is an electronics guru though!

My other thought is that bigger DPF's if not already out there will be forthcoming from VW, and perhaps upgrading to one off a Tourag or something would give a much lower pressure drop whilst doing the right thing. I'd pay to do that. I'm going to stick with the DPF until some options arise, and take it from there.

Love the bucket air filter, looking good.
Have you considered a dome shaped cap to clip onto the front of the air filter. This would reduce the turbulance produced by air entering the concaved cone in the front of it. May give a smoother air flow.

[mikinoz]

you may have more more KW - but I have no DPF to plague my mind of lost KW's...

I have 2 more mods in mind that I am keeping to myself until I can see if they make a difference (in the interest of looking foolish mainly)...

[Greg Roles]

I hear ya mate, but APEX'I know their stuff. It's designed to flow air smoothly on the inside where it counts. A front cap isn't a silly idea though...but you have to wonder why APEX'I do it this way to begin with. These filters are all the rage with the Supra crowd, and are a dry filament that doesn't kill / upset the MAF as oiled ones can do. Downside is they are a throw away $80 item.

http://www.apexi-usa.com/product_suction_detail.asp?id=166&pageNum=1

[Greg Roles]

you may have more more KW - but I have no DPF to plague my mind of lost KW's...

I have 2 more mods in mind that I am keeping to myself until I can see if they make a difference (in the interest of looking foolish mainly)...

I've considered a 100hp NOS shot too....

[Seano]

Given that you are 'only' running 2.0Tdi........might it be worth considering air boxes from other larger engined VW TDi's?

The T4 2.5TDi airbox takes air in direct from the outside on the drivers side fender and down at the bottom of the box.....the air runs pretty much in a straight line from the intake all the way to the inlet manifold......the filter itself is fairly massive and I had one filter that lasted 60,000km and still the air filter monitor didn't trigger.......the UK boys have been modding their T4 TDi's out to over 100kW without running out of air too...

[90lff]

so the place i got a quote off for a pod filter said they had to ring a supplier to find out info and would get back to me
so i gave him a call and said he cant get the part

so...
anyone wanna reccommend a place in brisbane that will do a pod filter on a golf

cheers

[gregozedobe]

My other thought is that bigger DPF's if not already out there will be forthcoming from VW, and perhaps upgrading to one off a Tourag or something would give a much lower pressure drop whilst doing the right thing.

I don't know whether the DPF on the Transporter 2.5 TDI like mine has better flow than the 2.0 GT TDI or not. The motor in mine (2.5l 128Kw, 400Nm) didn't rev out as well as the GT TDI I took for a test drive (mine seems to peak out at about 4,500rpm), but mine did have better torque at low revs (below 2000rpm).

The Touareg and some Audis have an optional 3.0l V6 TDI motor that produces 150+ Kw and 500-550Nm of torque, so the DPF off one of those might flow more than yours. I have vague memories of a larger capacity Audi V8 TDI too, and maybe even talk of some monstrous Audi V12 TDI.

There is also the 5.0l V10 TDI from the Touareg, but I'm not sure whether that has a single or dual DPF system (it is basically two 2.5l 5 cyl R5 TDI engines stuck together, and may have 2 separate exhaust systems).

So there are a quite a few VAG engines that might be potential donors

[Greg Roles]

All very interesting. In the end it comes down to flow benefit vs hassle / cost, and I'm sure the cost of a current DPF will be a factor. Thanks for the tips all the same, will put my ear to the VW ground.....


Guys ditch the Maf grid once you change the airbox, my car hasn't missed a beat, economy is still 850k's per tank which is clockwork for me, and I've Vag-com-ed it every arvo and there are no errors at all. Idle quality is as per stock, with no hunting or hesitation. Pickup and revving the car is noticably better, mabey it's largely just the sound, but it sure seems extra willing. Can't wait to sort out the other side of the turbo now!

[motk]

All very interesting. In the end it comes down to flow benefit vs hassle / cost, and I'm sure the cost of a current DPF will be a factor. Thanks for the tips all the same, will put my ear to the VW ground.....


Guys ditch the Maf grid once you change the airbox, my car hasn't missed a beat, economy is still 850k's per tank which is clockwork for me, and I've Vag-com-ed it every arvo and there are no errors at all. Idle quality is as per stock, with no hunting or hesitation. Pickup and revving the car is noticably better, mabey it's largely just the sound, but it sure seems extra willing. Can't wait to sort out the other side of the turbo now!

Could you test this empirically by timing how long it take to go from idle to 3k rpm in neutral or similar? It'd be interesting to develop tests for this observation at least!

[Mischa]

cogdog: you tha man

[mikinoz]

Brackie would have loved this thread!