Aftermarket Exhausts

[tab]

Jack take a - you've expressed the feelings of all but one person on this forum.

Mods - why is this idiot still allowed in here FFS? FFS??

[stang]

Ummmmmm is it possible to get Geeseman to change the color of his car I`m ashamed to have the same colored car as him.

[G6ET8U]

...for FFS... for FFS....

←

That's like saying, ATM machine. Haha

←

Sorry I didn't mean to make such trivial mistakes... I really didn't... but I am so worked up over it, it's taken me nearly 1.5 years to get to this point...

Geeseman, you make me want to own to Holden. No... I lie... you make me want to be one of those wankers who rides a bike everywhere...

You think you are doing them a favour when you speak about them, you aren't, you make me want to run, as fast as I can away from them. And I'm fat too, so I don't run.

Nuff said.

Jack

Edited 25/02/07 09:15 AM by XR6T8_U

[ford number 1]

I heard that APS are bringing out a new exhaust when they release their APS EDIT

[G6ET8U]

I heard that APS are bringing out a new exhaust when they release their APS EDIT  

←

Um... that is funny.

You know, I heard it was ONLY 2 weeks away...

Sorry... NOW THAT IS FUNNY.

Jack

[bcl]

.... and more easily achieved with a system with a larger dump pipe, as Julian picked up over 30rwkw when he changed his APS for something better with a larger dump pipe (when chasing 350rwkw).

Better aftermarket exhausts will now use something other than stock dump pipe.

Back in mid 2003 when the APS system was designed and installed with the stage 2 kits, it was designed for 260rwkw, then good to handle the stage  3 kits for up to 330rwkw.

My view is that if you're looking for 350rwkw up then go for an exhaust from the turbo back.... times change, and so do solutions.

Brian

←

You can't make any comparison there for two reasons.

1. The exhaust he had was modified therefore it can't be compared to the APS exhaust as it is sold today

2. the APS system with a stock dump pipe can run well over 400rwkw. In fact, the Autotech silver car ran 420rwkw with the stock dump and APS exhaust.

There is no need to change the dump when aiming for 400+rwkw with the APS exhaust.

Julian's car made 30rwkw more power when he replaced the APS exhaust.... end of story!

I'm sure Spiro can push his car to over 400rwkw, but as usual you either don't read or comprehend what I'm posting.

Back in 2003 when APS released their stage 2, at the C&V presentation day, I asked David Innall of APS if they had played with the dump pipe, and the anwser was no, as they had an exhaust that would adequately handle the stage 2 & 3 power levels they wanted.

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 wastegate 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

[Geeseman]

Julian's car made 30rwkw  more power when he replaced the APS exhaust.... end of story!

No, he reportedly made more power by changing a modified exhaust for another.

The exhaust he had was no longer the specification he purchased it at, so comparisons are misleading and uslesss. Trying to suggest otherwise is just a biased misrepresentation.

I'm sure Spiro can push his car to over 400rwkw, but as usual you either don't read or comprehend what I'm posting.

Lots of people have run over 400rwkw or near it on the stock dump simply because it doesn't need to be changed to make that power.

Back in 2003 when APS released their stage 2, at the C&V presentation day, I asked David Innall of APS if they had played with the dump pipe, and the anwser was no, as they had an exhaust that would adequately handle the stage 2 & 3 power levels they wanted.

Exactly. And your point is what?

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 wastegate 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.

[G6ET8U]

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.

You wouldn't know... you aren't there yet, neither am I, and with your UNICHIMP I can't see you getting there either.

Jeez I wish I'd been around when APS was, I mean pre the Iraq war, I also believe Clinton was still president...

Oh to live in your world.

You know I had a Late model camira 64... I never saw the need to upgrade to the C 120... seems as though you saw as much too...

Long live ATARI... Love LOVE ATARI.

X-BOX360 doesn't hold a candle to ATARI... pong anyone??? No, no, hold on, flight simulator, though now I'm talking about Amiga, but you wouldn't know what I'm talking about... APS 4 EVA... can you get 7 digit plates in NSW? They would be perfect for you.

[bcl]

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

[stealthxr]

.... and more easily achieved with a system with a larger dump pipe, as Julian picked up over 30rwkw when he changed his APS for something better with a larger dump pipe (when chasing 350rwkw).

Goose

As Brain says "Its More Easily Achieved" with the dump pipe....

As it is with an EDIT not your APS chip...

Get with the times...

Pete