After the Flash Tune - Add a Dump pipe

[Kai]

Baaaad idea.

Not only will you kill the earth with your emissions ... The EPA will come down on your arse with a $20,000 fine if they find out/inspect it.

Rather than go the APR route ($$$), get one custom made with a highflow cat, Seb had one made and installed it for $300 for me. It does make a noticeable difference (The downpipe)

How are they going too see a hollowed out cat.... ?

The fine is 10k (qld) from memory and KNOW ONE has ever been given it. (from memory)

[SoVeReIgN]

How are they going too see a hollowed out cat.... ?

The fine is 10k (qld) from memory and KNOW ONE has ever been given it. (from memory)

I know of a few guys with rotaries that were slapped with it and had their cars impounded (for a couple of weeks) down here in NSW.

Once they take a look under and see some exhaust work has been done they stick a meter in the exhaust to check it out.

But either way, its pretty irresponsible for something that doesn't make any signicant amount of power.

[Kai]

I know of a few guys with rotaries that were slapped with it and had their cars impounded (for a couple of weeks) down here in NSW.

Once they take a look under and see some exhaust work has been done they stick a meter in the exhaust to check it out.

But either way, its pretty irresponsible for something that doesn't make any signicant amount of power.

There are ways around everything.

But i wont mention them on the forum. PM me if anyone must know the loophole to getting around the fines.

[Ben_GTI]

Thanks for the info. I never thought of adding the dump pipe to my wish list.

$500 isn't too much compared with what an entire exhaust system costs when you consider the rest of the system is pretty free flowing.

[Timbo]

http://goapr.com.au/products/18trhd_downpipe.html

Will this fit?

This comes with a highflow cat aswell.

No, it won't (but maybe Guy can get something similar fabricated for the Polo )

The only off the shelf is Miltek...at a cost

[Kai]

He already makes the dump + cat for the polo but that only comes in a full exhaust.

If you can sell that seperatly. That would be awesome.

If you need to do tests and shiz my car is always avaliable

[Koz]

Would a dump pipe from the turbo to cat make much difference in regards to the sound if at all?

[Timbo]

Would a dump pipe from the turbo to cat make much difference in regards to the sound if at all?

In my case, virtually no sound difference. If sound is what you are after, either a full exhaust or cat-back is a better bet.

[GT3]

What about back pressure? What have you noticed? For instance, have you gained more mid-range and more up-top but lost a bit down low?

PS be great if you could post some photos of the mod if possible.

[Timbo]

Neil, Can't answer the back pressure one, and I think I'll need to get the full data set to answer where the power is accurately, but if you revisit the charts (esp. the Mainline ones)....this may send you cross-eyed ..., you can see that while the curves are very similar, the run with the dump pipe gains its power more rapidly that just the tune run.

It's all over by about 5,300 but the dump makes the progression seem much more linear -- the REVO tune delivers significant surge from 2,500 relative to stock, which you really feel; the dump smooths this a bit but nothing is lost down low. In fact, looking at the torque curve, which peaks at almost 300Nm at 3700rpm, it's above 200Nm all the way from around 2000 until 6. And that's what you feel (and what keeps breaking traction).

I'll try to get a photo this weekend

[Funkdancer]

I don't even know what a dump pipe is but it sounds like an impressive mod. With limited car technical knowledge I'd probably find it easier to go for the full APR system, but since that's ~4 times more expensive I'd probably not...

[Koz]

Yeh I definately dont want any change in sound just improved performance.

[Flaps]

Funk

Dump pipe is the name for the exhaust pipe from the turbo to the cat(Catalytic converter). It increases the flow of the exhaust gases to the cat.

Cat-back is from the cat to the tip of the muffler.

[SoVeReIgN]

I have a 3" dump and high flow cat on my car and it does make a different noise.

Turbo spool is slightly louder and has a rougher sound to it (spooling) - Even friends of mine had noticed it.

I found it gives a noticeable increase in midrange (where the turbo is on strongest) and slows the dropoff up top. No real difference to low end power.

[Kai]

I have a 3" dump and high flow cat on my car and it does make a different noise.

Turbo spool is slightly louder and has a rougher sound to it (spooling) - Even friends of mine had noticed it.

I found it gives a noticeable increase in midrange (where the turbo is on strongest) and slows the dropoff up top. No real difference to low end power.

Do you like the new noise?