Dump Pipe Front Pipe And Exhaust

[stasis]

  Sydneykid said:

This is an equal length engine pipe for an RB26DETT with a decent length of separation of the split dumps.

cheers

Are thereany difference between a normal aftermarket front pipe and a front pipe for competition use only?

[stasis]

  stasis said:

Are thereany difference between a normal aftermarket front pipe and a front pipe for competition use only?

Finally i sourced out a dump pope for the 260rs. Its from a R32gtr. thanks again for the help that you guys have given me. So i've got HKS dumps and front pipe. I have not sourced out a cat back yet. dont know which brand.

Also anybody know about 260rs BOV? can i use the r32gtrs BOV?

[BoyWhoCriedWolf]

The pic on the right is a 32/33 front pipe. This will not help you on your car. The pic SK put up is what you are after.

[Sydneykid]

  stasis said:

Finally i sourced out a dump pope for the 260rs. Its from a R32gtr. thanks again for the help that you guys have given me. So i've got HKS dumps and front pipe. I have not sourced out a cat back yet. dont know which brand.

Also anybody know about 260rs BOV? can i use the r32gtrs BOV?

The standard 260RS BOV's are perfect, LEAVE THEM ALONE.

Bad choice on the HKS split dumps, they are too short for decent separation.

That's why I put up the pictures of dumps with decent length of separation.

That's why you have to buy dump pipes (long) and engine pipes (short) at the same time.

Try and aim for R33GTR parts, many R32GTR parts won't fit.

cheers

[stasis]

  Sydneykid said:

The standard 260RS BOV's are perfect, LEAVE THEM ALONE.

Bad choice on the HKS split dumps, they are too short for decent separation.

That's why I put up the pictures of dumps with decent length of separation.

That's why you have to buy dump pipes (long) and engine pipes (short) at the same time.

Try and aim for R33GTR parts, many R32GTR parts won't fit.

cheers

ok sydney im getting more confuse now. When you say its too short (the dump pipe) do you mean as a whole or just the split? They are almost equal lenght you know. The dump pipes im looking at are for R32, 33,44s. That what it says. unless they have it wrong. I've talked to Steve in gold coast the guy who owns the wreckers yard and he said r32 or 33s dump pipes wise are the same. Which is which now?

If the HKS dump pie is too short than which brand were you referring too? The only reason i chose the HKS dum pipe is beacause my front pipe is a HKS as well. so...

Can you elaborate more which is the engine pipe? And how about this dump pipe? i would have guessed it too short huh...

Edited May 1, 2006 by stasis

[Sydneykid]

  stasis said:

ok sydney im getting more confuse now. When you say its too short (the dump pipe) do you mean as a whole or just the split? They are almost equal lenght you know. The dump pipes im looking at are for R32, 33,44s. That what it says. unless they have it wrong. I've talked to Steve in gold coast the guy who owns the wreckers yard and he said r32 or 33s dump pipes wise are the same. Which is which now?

If the HKS dump pie is too short than which brand were you referring too? The only reason i chose the HKS dum pipe is beacause my front pipe is a HKS as well. so...

Can you elaborate more which is the engine pipe? And how about this dump pipe? i would have guessed it too short huh...

Lets get the terminology aligned first

turbo ---->dump

.........................-----> engine pipe-------> cat --------->cat back exhaust

turbo----->dump

Now onto your questions, firstly the separation is too short. The purpose of a split dump is to separate the turbulance caused by the opening of the wastegate from the spiralling output of the turbine. By separating them you get faster boost build, quicker throtte response and higher average power over the used RPM range. The HKS split dumps don't separate the wastegate exhaust and the turbine exhaust for long enough, the pipes are too short, they join too quickly, the separation isn't long enough.

The reason HKS make them that short is because that is the length of the standard dump. HKS assume that you want to use a standard length engine pipe, so they have to make the dump the standard length. Even if it is too short for maximum effect. The Japanese bolt on philosophy says "make a replacement part fit exactly as the standard part". Mechanics in Japan charge like brain surgeons, so fitting labour has to be minimalised.

The better split dumps (longer separation) come with their own engine pipe in a kit. They have to as the longer dump means you can't use a standard length engine pipe. As you can see in the picture (previous post) of the Apexi long split dumps and engine pipe kit.

Hope that answers your question

cheers

[stasis]

  Sydneykid said:

Lets get the terminology aligned first

turbo ---->dump

.........................-----> engine pipe-------> cat --------->cat back exhaust

turbo----->dump

Now onto your questions, firstly the separation is too short. The purpose of a split dump is to separate the turbulance caused by the opening of the wastegate from the spiralling output of the turbine. By separating them you get faster boost build, quicker throtte response and higher average power over the used RPM range. The HKS split dumps don't separate the wastegate exhaust and the turbine exhaust for long enough, the pipes are too short, they join too quickly, the separation isn't long enough.

The reason HKS make them that short is because that is the length of the standard dump. HKS assume that you want to use a standard length engine pipe, so they have to make the dump the standard length. Even if it is too short for maximum effect. The Japanese bolt on philosophy says "make a replacement part fit exactly as the standard part". Mechanics in Japan charge like brain surgeons, so fitting labour has to be minimalised.

The better split dumps (longer separation) come with their own engine pipe in a kit. They have to as the longer dump means you can't use a standard length engine pipe. As you can see in the picture (previous post) of the Apexi long split dumps and engine pipe kit.

Hope that answers your question

cheers

ok the layer of fog have lifted up. If thats the case Apex does make a front and dump pipe in one? Is this coerrect? I probbably should start learning jap language cos the web pages that im browsing now its all in Jap!!!.

As i recall i think Just jap have a unit thats 2 in one dump and front pipe 2 in 1. Is it recommended?

[AlexCim]

HKS make direct replacment dump pipes, using stock standard front pipes is possible, or any direct replacement front pipe thats aftermarket.

To have the best performance, the dump pipes need to be longer, therefore the front pipe has to be smaller to fit in the same distance under the car.

You need to buy a full dump/front pipe kit from Apexi if you want the longer split dump pipes.

[stasis]

  AlexCim said:

HKS make direct replacment dump pipes, using stock standard front pipes is possible, or any direct replacement front pipe thats aftermarket.

To have the best performance, the dump pipes need to be longer, therefore the front pipe has to be smaller to fit in the same distance under the car.

You need to buy a full dump/front pipe kit from Apexi if you want the longer split dump pipes.

Do you have a poc of the apex stuff by any chance?

[AlexCim]

yes, i do

[stasis]

  AlexCim said:

yes, i do

ok thanks for that. how much are they worth you know>?

[stasis]

Anybody heard before a japanese exhaust breand called boyz?

[MrGTST]

Are Apex the only Jap Tuner brand to do dump/front pipes with longer then standard splits? I am looking to buy a HKS cat back exhaust and being a fan of HKS my first instinct is to get HKS dump/front pipes also...

I want maximum performance increases from my exhaust so I want to get it right... From what I have seen Trust also makes some good dump/front pipes, anyone able to comment on that?

Anyone care to comment on what exhausts give the most performance increases, bearing in mind I am a HKS fan and muffler wise I prefer the angled "drift" style cannon muffler....

Cheers

Brett

[stasis]

  MrGTST said:

Are Apex the only Jap Tuner brand to do dump/front pipes with longer then standard splits? I am looking to buy a HKS cat back exhaust and being a fan of HKS my first instinct is to get HKS dump/front pipes also...

I want maximum performance increases from my exhaust so I want to get it right... From what I have seen Trust also makes some good dump/front pipes, anyone able to comment on that?

Anyone care to comment on what exhausts give the most performance increases, bearing in mind I am a HKS fan and muffler wise I prefer the angled "drift" style cannon muffler....

Cheers

Brett

get a hyper ev mag on stageas from japan. its the bible. anybody seconfs that?

[frankxinyu]

someone please tell me howyou can add an external wastegate on a stock turbo on the RB25, which has a wastegate built in.

[AlexCim]

weld the wastegate shut and put an external gate off the new manifold you'd have to make.

i dont know why you would do that anyway, if you want noise, just get a split dump/front pipe in one and atmo vent the wastegate pipe.