GTX3076R T4 Divided 1.06 Topmount

[Steve@VersaTune]

Like the title says. GTX3076R T4 divided 1.06AR topmount.

It's going into my MS6.

AFI T4 divided topmount manifold - ceramic coated and wrapped
Dual Tial 38mm MV-S wastegates
ATP T4 divided 1.06 AR housing ceramic coated and blanket
Garrett GTX3076R w/ Snail Turbo billet compressor wheel (original ingested debris)
Carrillo rods/bolts
CP 9:1 Pistons
ARP main and head studs
Ported head
Port matched stock intake w/ VTCS intact

The goal is to see how much area under the curve can be obtained without supplemental fuel.

Then the baby turbo goes buh-bye and we get serious w/ some new fueling solutions.

As you can see from the pic, it's almost ready to go in.

[maisonvi]

Port matched with VTCS still in it? Seems kinda odd. Is there just a lot of space around the flappers now?

[Steve@VersaTune]

I didn't go deep into the runners. I just flared the opening from the flaps out to the flange to smooth the transition.

[maisonvi]

Originally Posted by Steve@VersaTune I didn't go deep into the runners. I just flared the opening from the flaps out to the flange to smooth the transition.

Any reason why? Just to keep cold start not terrible? Seems like it would be quite a restriction on the rest of the system. Especially with a ported head you should have awesome flow.

[Steve@VersaTune]

Trying to keep low end torque for early spool. I'm going for max area under the curve for this phase. I will put a new intake on when I swap the turbo.

[MSP611]

Thts quite a big hotside if Ur looking for spool

[Steve@VersaTune]

I'm trying to see if all of the insulation on the exhaust manifold and housing can make up for it. I may swap out the housing.

[cam1391]

Originally Posted by Steve@VersaTune I'm trying to see if all of the insulation on the exhaust manifold and housing can make up for it. I may swap out the housing.

Im so confused. It seems like trying to make a spoon a fork it your goal.

[MSP611]

Ummm I'm pretty sure insulation on Ur exhaust mani. Isn't going to make up for Ur spool

[Steve@VersaTune]

I plan on testing different parts. That's what this car is for. T4 hotside selection is limited. I plan to make some big numbers later on. I didn't want to have to swap the manifold. I wish there was a true twin scroll t4 like the EFRs have. I may switch to an EFR when I'm ready to go big.

[Mauro_Penguin]

Tell me more about this twin scroll manifold your using.

[theschrum]

Originally Posted by MSP611 Thts quite a big hotside if Ur looking for spool

When going twin scroll, you can't really compare the a/r of the turbine housing to what you would go with single scroll. Spool should come on very quickly with this size turbo and 1.06 hotside.

With my PTE 6262 and a T4 1.06 twin scroll hotside, I hit 23psi on my very first pull at 3240 rpm.

[Steve@VersaTune]

AFI Turbo Manifold - Mazda Speed 3/6 Topmount - Race only- TREADSTONE PERFORMANCE

Pics of mine with twin EWG:









After ceramic coating:

[MSP611]

where did u get a twinscroll housing for a PTE??

NM found AGP turbo carries them... fuck if I would of known I would of got a t3 twinscroll housing and mani... fuck!!

[Steve@VersaTune]

Originally Posted by theschrum When going twin scroll, you can't really compare the a/r of the turbine housing to what you would go with single scroll. Spool should come on very quickly with this size turbo and 1.06 hotside. With my PTE 6262 and a T4 1.06 twin scroll hotside, I hit 23psi on my very first pull at 3240 rpm.

Yeah. 1.06 isn't as huge as it sounds. I do wish there was a .92 T4 twinscroll option like the EFRs have.

Originally Posted by MSP611 where did u get a twinscroll housing for a PTE?? ive never seen one on any site for sale

ATP. It's listed as GT35, but they have a GT30 option.

Turbine Housing, T4 Divided inlet 3" V-Band outlet, 1.06 A/R for GT3582R/GTX35 : atpturbo.com

[theschrum]

Also, not sure if AFI fixed the design, but there will likely be clearance issues for the wg if you are keeping your A/C. And super tight dp fitment.

[MSP611]

Originally Posted by theschrum Also, not sure if AFI fixed the design, but there will likely be clearance issues for the wg if you are keeping your A/C. And super tight dp fitment.

this is on the top mount mani's??

[Steve@VersaTune]

Originally Posted by theschrum Also, not sure if AFI fixed the design, but there will likely be clearance issues for the wg if you are keeping your A/C. And super tight dp fitment.

I'm having the DP and WG piping custom fabbed. They can cut and redirect that WG pipe if needed.

After looking at the pics side by side, my WG pipe has a different angle. I'll find out about clearance in a day or two. It's going in this week.

[JMEngineer]

I have a topmount 3076 with the .78A/R T3 twin scroll housing; I should have gone with the 1.06.
I had to put a custom spring in my dual port BOV to allow some recirc while cruising to keep it from surging. It's nearly impossible to stay out of boost during normal driving and it hits 32 psi at just over 3000rpm.

[cam1391]

Wow that is an incredible difference from single scroll.

[Etipp98]

I thought wrapping a manifold that has ceramic coat is a no-no?

[Lex]

The twin scroll already improves spool characteristics by reducing cylinder interference so you can run a larger A/R from that perspective and achieve similar spool.

However a twin scroll housing with the same A/R as a single scroll will be more restrictive. The increased surface area of having a divided housing means more friction for the exhaust gases. This is another reason to run a bigger A/R on a twin scroll versus a single.

[RE-ACTIONENGSPEED3]

so any updates?

[Steve@VersaTune]

I've been crazy busy lately. I got it in the car on Monday night. There is a clearance issue with one wastegate. I will need to make a short angled extension to locate it where there is clearance. I'm travelling right now so I can't post pics.

[RE-ACTIONENGSPEED3]

Originally Posted by Steve@VersaTune I've been crazy busy lately. I got it in the car on Monday night. There is a clearance issue with one wastegate. I will need to make a short angled extension to locate it where there is clearance. I'm travelling right now so I can't post pics.

When you have time share some photos , because i`m really interested in the top mount setup with t4 divided option .........

[Jtaylor]

Originally Posted by RE-ACTIONENGSPEED3 When you have time share some photos , because i`m really interested in the top mount setup with t4 divided option .........

Shouldn't you be running a 10 second 1/4 mile right now?

[RE-ACTIONENGSPEED3]

Originally Posted by Jtaylor Shouldn't you be running a 10 second 1/4 mile right now?

I should, but the next race in my country is very unknown (due to my country`s economical situation)about when it will take place...I estimate late September....

[theschrum]

I'm guessing you ran into this issue.

[Steve@VersaTune]

Originally Posted by theschrum I'm guessing you ran into this issue.

No. It's on a different angle than that. The tial mvs I have hits the protruding firewall on my MS6. It clears the ac line.

[Steve@VersaTune]

Here is my setup. Close, but not quite clear.

[Steve@VersaTune]

At the fab shop now. Should be on the road next week.

[MSP611]

Im excited to see wat this does... I may have to put a twin scroll housing on my AFI Mani and see how this turbo handles it

Sent from my Nexus 7 using Tapatalk

[Steve@VersaTune]

I ran the engine for 10 min with just a short elbow on the turbo to check for oil/water leaks. With the ceramic coating + turbo blanket, I was able to put my hand on the blanket. It was only a little warm. It's safe to say that the exhaust energy is being retained in the exhaust stream. I'm very anxious to see what the spool profile looks like.

[RE-ACTIONENGSPEED3]

twin scroll rocks.......
I`m really curious to se how this turbo setup will spools and handles power at high revs.

[MSP611]

Hmm guess we'll see if this double heat protection is a go or not.. Will tell me i need to buy a blanket or not cuz I was slightly wondering the same thing lol.

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[Mazdazilla6]

I'm really curious to see how the spool is on this. One of the last things I'm still deciding for my turbo is what A/R I want. I'll be on an S256 (similar size to the gt3076) but on a T3 housing and I can't decide between a .75 and 1.0.

[Jeff23spl]

if the spool isn't good but you already have the twinscroll can you try soemething similar to this?
Maybe juste a trap made in between with a kind of wastegate pressurised actuator to activate the second part when the initial boost is reached ?

Is Variable Twin Scroll Turbocharging the Answer to Future Turbos?

[PurplFox]

Thats a cool idea. would you control the scrolls with a manual set up

[Jeff23spl]

just a pressure actuator could probably works fine? a used 8psi WG for exemple.

the second chamber would open when the intake reach 8 psi. the only problem could be to direct the flow of the blocked side to the other scroll

[JMEngineer]

Originally Posted by JMEngineer I have a topmount 3076 with the .78A/R T3 twin scroll housing; I should have gone with the 1.06. I had to put a custom spring in my dual port BOV to allow some recirc while cruising to keep it from surging. It's nearly impossible to stay out of boost during normal driving and it hits 32 psi at just over 3000rpm.

Photo evidence... 30psi at about 3100rpm in 4th