Jump to content
SAU Community

Recommended Posts

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

nengun-product-207.jpg

:) cheers :O

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

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?

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.

:bunny: cheers :O

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...

post-27949-1146482885.jpg

Edited by stasis
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

:thumbsup: cheers :D

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

:ermm: cheers :D

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?

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.

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?

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

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?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • You’re all still going on about track cars, he has said multiple times doesn’t intend to take it to the track,  just stick to what was said at the beginning and do the pump and ecu, it’ll get you enough for 230kw at the wheels and has enough poke to be fun for what you want it for 
    • All of that is absolutely true. At any time in the history of these turbos the lottery has always been that it could die at stock boost treated exactly as the factory intended, or it could die when pushed to 10, or 12, or 14, or 16 psi, after a short time, or a longer time, or it could last seemingly forever. You have the combination of all the possible statistical (probably) normal distributions of manufacturing tolerances and quality outcomes, on top of the statistical distributions of failure modes (which might be normal, but are probably biased, like Poisson distributions). You get the lucky turbo and you can beat on it for years. You get the really unlucky turbo and it will crap itself as it rolls out of the factory gate. And every possibility in between. But you can definitely still kill the lucky turbo. It's just that most people didn't try, once they knew they really shouldn't try.
    • Maybe I have Stockholm syndrome but working on an M2 isn't that hard. Getting parts cheaply and quickly is hard, but getting parts same day isn't necessarily hard if you're willing to pay way too much for it at local dealers. There's a lot going on, you need to have a build of ISTA on a laptop and the right cable, if you don't have the mindset of "do it exactly right or not at all" you will probably start seeing cascading failures. Skylines are a little more tolerant in that regard. The car doesn't potentially trash itself if you bought the wrong oil filter like a BMW would. Or trash the entire cylinder head and potentially spin a bearing because someone took the anti-drainback valve out of the plastic oil filter cap. An M2 will also do just fine on track, zero oil starvation concerns, factory brakes are great if you change the pads for a high temp compound + flush with track-ready fluid.
    • The "ideal/formula" that used to be touted was death of the turbo is going to be caused by a combination of 3 things. Heat Speed of turbo (boost level you're pushing) Time   Basically, you can get away with high heat and high boost for short periods. But start doing long hard pulls, or circuit driving etc, and now you've increased time as well which will shred things. From memory when Adrian was drag racing he was running 17psi, on a stock turbo, and running insane speeds. But he also had other additives helping in the setup too. Some people have success at 14psi for a while, while others due to pushing the cars hard for long periods opt down to lower temps. But also, generate a lot of heat (let's say bad tune), for a long time, and you'll be okay, until you try to spin that little guy up slightly. It's the one advantage of dumping a lot of fuel in, you'll be reducing EGT a bit and helping with the heat portion of the above 3 areas.   And these days, stock turbos are that old that there's the possibility of just outright failures due to material age. I'm not shocked that even when used in factory spec that a stock turbo fails when 30 years old. It's a worn out "precision" "balanced" performance item, that's likely no longer precise, or well balanced
    • this... hence I said what I said previously, SMSP nights you see mainly Hondas, Evos, A90s, F80x and the odd VW. The 5 or 6 times I went, I only saw 1x R32 GT-R, and other than that I was the only one in a shit box Skyline.
×
×
  • Create New...