Aftermarket Exhausts

[G6ET8U]

Nah... you are wrong, there is now absolutely no data now to say you are wrong but YOU ARE....

FU(k it I'm selling my car and I'm going to buy a Holden, even though my bests mates VY R8 is slower than my car, it's not the point, I don't have any APS gear on my car so it must be a heap of cr@p...

My T is now up for sale...

You have to having a laugh Gessey... surely you do. If not, then the only people who are lauging are us, and sadly you DON'T get the joke.

Jack

[stealthxr]

I dare ya jack..... If you do I will......

[G6ET8U]

  bcl said:

  Geeseman said:

  bcl said:

Once you start pushing much higher power levels on turbo cars the dump pipe becomes more of issue, and something you need to focus on. I have played with this area with previous turbo cars, both larger (4"), separate pipes, and splitters in dump pipes.

Run too large a dump pipe on mid power levels and you can lose a lot of mid range torque.

With high power levels a larger dump pipe on a good exhaust with yield better results when chasing top end power. At both high revs and high power the larger dump will better accomodate the very hot and expanding exhaust gas ex-turbo, before it cools further down the exhaust.

Another issue is that with an internal wastegate, the flapper does not open to 90 degrees, so at higher power levels the watsgate gas is flowing at an angle, causing much extra turbulance, and possible impedance to the main gas flow. A separate dump pipe, or larger main pipe will help alleviate this problem.

Brian

←

I don't question this theory at all but what I do is at what power level does it become neccessary to change the dump? Certainly not before 400rwkw as plenty of people have shown.

←

Very few people run over 400rwkw .... as I note you're not there yet.

People like Julian and the work that Tunehouse have done would indicate that from around mid 300rwkw would give good results (and possibly lower).

Dean also got good results with his dump pipe testing.

I note that RDP have also incorporated a separate pipe in their design, as does Defillipo.

Brian

←

Have you run a 10 yet?

Sorry, sorry...

HAVE YOU RUN AN 11 YET?

Jack

Edited 25/02/07 10:54 AM by XR6T8_U

[Adam]

Seriously this is a joke!

Geeseman I see what you are saying...

The bigger dump pipe is not needed to make up to 400rwkw's so why use it.

Fair enough, but lets look at this from a different angle...

You don't need a whole APS exhaust to make Phase II power levels either, so why use that?

Look at it anyway you like but there's plenty of things being used that may or may not be required.

If someone wants to spend $600 on a dump pipe to help them to 400rwkw's they're more than welcome to do it.

If someone wants to spend $1900 on an APS exhaust which isn't needed to get 270rwkw's they're are also more than welcome to do it.

[G6ET8U]

Adam don't ruin my fun...

Jack

[ENVY-T]

And I thought Mr chrome dome was a stooge.

ATARI? I still have mine, is there a way that I can connect it to my ICC?

As with the factory plumbing, you can make 350rwkws with it, but you are pushing alot more PSI to make up for the sh*t design. My understanding is the same for the dump, correct me if I'm wrong, but when you get up to 400rwkws, wouldn't you be using less boost to get the power figure, than if you had the factory dump?

And on a side note, "Member NSW 12 sec club", with 350rwkws and 11ty billion NM, you should be knocking on the door of 10's.

[Geeseman]

  bcl said:

Very few people run over 400rwkw .... as I note you're not there yet.

That's true however I've seen a few above 400rwkw and none of them have needed to remove the factory dump pipe.

  bcl said:

People like Julian and the work that Tunehouse have done would indicate that from around mid 300rwkw would give good results (and possibly lower).

Brian, I don't know how many times it has to be said, Julian's car had a modified exhaust so it can't be compared to an unmodified aps exhaust. An exhaust's most restrictive part dertermines its flow capabilities. To alter any exhaust alters these capabiliites.

Your comments on 300rwkw being a level for the dump change are based on what?

  bcl said:

Dean also got good results with his dump pipe testing.

Dean's car does not use the APS exhaust so it's irrelevant. His results were also conducted on different days and under different tuning maps.

[G6ET8U]

Geesey has been hatching the return for a few minutes...

I will personally give him 2 weeks, but that is it...

[ENVY-T]

Steve which one are you?

Actually forget them, you are a

[G6ET8U]

On a beating to nothing is the answer below...