I just contact ATP about the 1.06R T4 gt35R exhaust housing that they offer
They just reply me this:

"It's a real T4 1.06 A/R housing and many people have used it on that engine and many other engines and they all love it."

 

Then they told me this:

"People are saying that it is a smaller A/R because it's similar to the divided T3 1.06 housing, but we have tested both and the T4 1.06 A/R version we make flows a lot more than the T3 1.06 A/R. You've got nothing to worry about."

 

From
http://www.turbobygarrett.com/turbob...tech102.html#b

A/R (Area/Radius) describes a geometric characteristic of all compressor and turbine housings. Technically, it is defined as:

the inlet (or, for compressor housings, the discharge) cross-sectional area divided by the radius from the turbo centerline to the centroid of that area.

Turbine A/R - Turbine performance is greatly affected by changing the A/R of the housing, as it is used to adjust the flow capacity of the turbine. Using a smaller A/R will increase the exhaust gas velocity into the turbine wheel. This provides increased turbine power at lower engine speeds, resulting in a quicker boost rise. However, a small A/R also causes the flow to enter the wheel more tangentially, which reduces the ultimate flow capacity of the turbine wheel. This will tend to increase exhaust backpressure and hence reduce the engine's ability to "breathe" effectively at high RPM, adversely affecting peak engine power.

Conversely, using a larger A/R will lower exhaust gas velocity, and delay boost rise. The flow in a larger A/R housing enters the wheel in a more radial fashion, increasing the wheel's effective flow capacity, resulting in lower backpressure and better power at higher engine speeds.


To me the radius looked the same as the T3 but only way would be to measure.

The turbine housing is only part of the problem too - the turbine itself will also limit the flow.

 

Its true , Sesshoumaru, but the point is : are we going to reach the turbine limit with a real 1.06R T4 housing? , when BoxerToRotay haven't with his turbine housing that is a way smaller than mine.

Actually I have looking for that setup long time ago
Take a look of this

https://www.rx7club.com/3rd-generation-rx-7-1993-2002-parts-99/fs-spec-1-06-t4-divided-turbine-housing-35r-781732/

And this

https://www.rx7club.com/single-turbo-rx-7s-23/gt35r-similar-exhaust-r-747589/


I know that the HTA have a bigger compressor wheel so that could translate in more back pressure on the hot side , I quite sure that on a gt3582r that housing will work perfect , but I dunno how can affect the hta 86 compressor wheel on the back pressure of the hot side.

 

There is a lot of great points being made here. Remember I just wanted to "test" this turbo out to see how it performed.

Rexset would have been fine with the t3 1.06 because If you read his post he is only looking for 400whp. The t4 will definently give you more room plus more options if you decide to swap turbo on the future.

 

Sorry for the typing errors I'm using the app from my phone.

 

https://www.rx7club.com/spec-tuning-154/differences-between-our-t4-turbos-others-621643/

It looked more like the one on the right - again even if it was the smaller T3 its not like it's the end of the world.

 

I think if you got a real T4 1.06 it would be a good compromise and work well but it just doesn't look like a true T4 to me in that pic.

 

True , they look completely different .

But have to trust in ATP till I get my turbo back here, even thou , i just sent a message to A-Spec to know if they use the ATP housing or if they have they own.

Hope that ATP not lie to me.

 

nice build

 

Ok , today my ATP housing arrives Forced Performance
They compare it with the t3 1.06 and they told me that is bigger than the t3 but smaller than the real t4 , and it look the same than the 1.00R T4 that they offer, that's good , but on the other hand they just told me that with the ATP housing it get real hard to connect the coolant circuit of the turbo, and with the T3 is much easier.

Well it seems thats it is the only option , and we ware all telling the true about it.
So it bigger than the 1.06 T3 but smaller than the 1.06 real T4. Resume , we have to try it on the car.

I have just 1 concern about it , I use the car for top speed , thats why I want not to boost it more than 15psi , so mi only real concern now is the Ex temperature at 15psi in 5th WOT.

 

Some one knows some body that have experience the HTA gt3586R turbo with the ATP 1.06 T4 housing on the FD3s??

 

fp 3586r t4 1,00.

One week till finish

 

Excellent!!!!!

Please let me know how it goes

Here is mine , waiting till I get some minors parts to install it

 

here it goes

 

Wow looks like I may have started a trend with the 3586R which was my intent as I have always had great results with forced performance products. I'm anxious to see the t4 results.

 

Ok here we go.

HTA GT3586R exhaust housing ATP 1.06 T4


Im porting and make the shape of the exhaust housing more smooth

Opinions?

 

shes a beauty!

 

almost ready

 

Great build!! I'm also in the process of building one with a GT3582R T4 divided 1.06 ar turbine housing. Post some power bands when your done!

 

i will have dyno numbers after summer as the weather in Greece in no good for tuning in the summer. Average temperature 33-40 celcius everyday!!!

 

another one

Any opinions??

I cant get any further with the Dremel , but hopefully all the imperfection where on the near the T4 flange.

Yes will be nice to see some number , i want 400whp @15psi and I will be more than very happy

 

This should give us a good comparison as to whether its worth bolting on a larger T4 housing or not with this turbo. My Dyno numbers were uncorrected so with correction should actually be a bit higher.

 

I have 4 primaries , and nipon denso supra fuel pump on the tank.
What are you set up?
I don't want to buy bigger injectors if I'm not going to need them, now with the T04E and charging 13psi they are far from the limit.

 

I run 550/1600 with alcohol injection kicking in at 15psi currently running about 1200cc AI and I can go up to 1500cc but that's a lot. For my 15 psi map I don't use the alcohol. Thats just for the high boost settings. I run a supra fuel pump with a kenne bell BAP at 20% which was recommended to me by Howard Coleman. -8 feed and returns with stock primary fuel rail and Aftermarket secondary and an Aeromotive FPR.