PHR - Powerhouse Racing S23A Turbo Manifold for 2JZ-GTE

~~$1,989.00~~ $1,889.55

SKU: PHR 01012086.C.T4.T.2.D44

Powerhouse Racing S23A Turbo Manifold for 2JZ-GTE

SKU: PHR 01012086.C.T4.T.2.D44

Features and Solutions

Focusing on what's important

The Powerhouse Of Manifolds

Our manifolds are a key piece on some of the fastest and most beautiful cars on the planet. We hope to be a part of yours.

Equal Length Design

The Powerhouse Racing S23A Turbo Manifold features equal length (and equal volume) runner design. This means the distance from the exhaust port to the turbo is equal between all 6 runners. This not only produces a heavenly exhaust note that you won't find anywhere else, but also increases overall performance.

The even exhaust pulse helps each runner to scavenge the next pulse and provides consistent exhaust pressure throughout the manifold, at the turbine wheel and at the wastegate. You will find this produces higher peak power, better spool, lower exhaust back pressure, and better boost control.

23 vs 45 vs 50

You'll notice the second two digits on our manifolds are different (eg: S23 vs S45). What's the difference between the manifolds? Runner size. Below is a chart to help differentiate between manifold runner sizes.

2nd Two Digits	Primary Runner Size
23	1.25 Schedule 10
45	1.5 Schedule 10
50	1.5 Schedule 10

Runner size is an interesting debate. You can think of this in the same manner as Turbine Housing A/R if you are familiar with it. A smaller runner restricts flow, but increases exhaust gas speed. A larger runner increases flow, but decreases exhaust gas speed. Higher runner flow will result in slightly higher peak horsepower, but slightly slower spool. Lower runner flow will result in slightly lower peak horsepower, but slightly faster spool.

The decision on what works best for you depends on how you plan to use your car. If you are trying to maximize horsepower for your turbo, a larger runner may benefit you. If you want better all around power, a smaller runner may benefit you.

None of our manifolds are poor at making horsepower. Our 23 and 45 turbo manifolds both are rated for the same horsepower. UP to 2000 or more if you have a turbo that can do it! The turbo you choose plays a much larger role in the horsepower you can make. The manifold is often better chosen after you decide what turbo you will use and where you want your performance to be.

Our 50 series turbo manifolds are reserved for PRO MOD Drag Race Turbo's and paired with a capable turbo, can produce anywhere from 1500hp to over 3000hp!

Installation

Equal length manifolds can be a real pain to install, but we have focused on trying to ease the burden of doing so. We include short studs for our 2JZ-GTE manifolds and provide a flange nut with a smaller flange to sit next to the runners. We pay careful attention to the area around the stud to make sure it can seat properly and you can get the necessary tools to the nut.

Fitment

PHR builds the best fitting manifolds. Turbo positioning is ideal. We allow for plenty of room for downpipes, and oil drains, and they fit perfectly under the stock supra hood, even with very large turbos.

A note for IS300 owners: This manifold will not fit on your car. Instead, you should look at our QR Series Manifolds, which all fit the IS300, or we make an S23 manifold specific to the IS300.

Some Details

PHR S and V Series manifolds use schedule 10 stainless steel tubing. Strong material backed by our lifetime warranty against cracking.
PHR S and V Series manifolds are hand built in-house by some of the best fabricators on the planet. Pain-staking detail is taken in every inch of these.
All TIG welded, Fully back purged, for strength quality and flow. These also eliminates any crystallization (slag). Slag can break off from inside lesser designed manifolds and damage the turbo.

Cast Collector

PHR is the first to use cast collectors on manifolds for the 2JZ. The cast collector keeps all of the benefits of our billet collectors, while reducing the production costs. Our cast collectors keep strength and enhanced flow at the turbo inlet. Not to mention they still look amazing.

While we love our billet collector manifolds, you can achieve the same performance with our cast ones.

T4 Turbine Housing

Powerhouse Racing is proud to offer our S23A Turbo Manifold for the 2JZ-GTE engine. It's made to support T4 inlet turbine housing equipped turbos like the Precision S-Cover, H-Cover and Sportsman cover turbos.

Maximum Performance

PHR manifolds are used by some of the fastest racers in the world. We take pride in designing and producing the highest quality and best performing manifolds on the planet. We have manifolds that work well anywhere from 500hp to over 3000hp!

More than just a manifold

We include more than just a manifold when you purchase a PHR S23A.

Short Stud and Nut Kit

If you've ever installed a turbo manifold on the 2JZ-GTE, you understand the pain it can be. The factory studs were designed with the stock sequential turbos in mind and therefore are not ideal to use with a tubular manifold. They are way too long and become a huge problem when installing a manifold.

PHR remedies this problem by providing our Short Stud and Nut Kit, which features Grade 12.9 Studs, so not only are they shorter, they are also much stronger than OEM. The flange nuts also have a smaller diameter flange which allow them to fit better next to the tubular runners.

Lower Waterneck Adapter (Rotator)

The lower waterneck adapter, rotates your waterneck downward, and away from the turbo manifold, giving you the extra room you need to install the turbo manifold and turbo. These are essential for clean installs without extra work or welding to get the turbo, manifold or intercooler piping fit properly.

Boost Control

Advertised spring pressure does not always follow real world turbo outlet pressures. Several factors will affect the wastegate opening pressure. Mostly it's pressure on the bottom of the diaphragm and pressure on the bottom of the valve. Pressure on the bottom of the diaphragm is easy, it's really just turbo compressor outlet pressure. Pressure on the bottom of the valve is more complicated.

Manifold design, turbo sizing, turbine size and Turbine housing A/R directly effect pressure on the bottom of the valve. These can all effect exhaust manifold pressure, not only at the turbo, but at the gate as well. You can get different pressures in the collector of the manifold and at the bottom of the valve, but in general, they should be fairly close to the same, but even 1 or 2 psi will have an effect. With all of those factors added in, you cannot assume the advertised spring pressure will output actual advertised boost pressure.

A very well designed manifold/turbo combination may produce significantly less exhaust back pressure, which will increase the turbo compressor outlet pressure compared to advertised spring pressure.

All this told, the advertised spring pressure is a good guideline, but the springs will need to be adjusted depending on what testing results we get. Typical pressure on PHR Manifolds are usually 5 psi above advertised on Tial wastegates. If you want lower pressure, say 14, you may need to put a 9 or 10 psi spring combination in.

The most important thing is not the advertised spring pressure, but the ability to control the boost to what you want. As long as you are not boost creeping, the wastegates are doing their job.

Specifications

Vehicle Fitment
Make	Toyota, Lexus
Model	Supra, SC300 (Soarer), GS300 (Aristo)
Generation	MKIV (Mark 4), 1st Gen, 2nd Gen
Chassis Code	A80, Z30, Z31, Z32, S160, S161, S147

Fitment
Engine	2JZ-GTE, Non VVT-i, 2JZ-GTE, VVT-i
Turbo Fitment	Precision S Cover, Precision H Cover, Precision Sportsman Cover

Product Specs
Material	Stainless steel
Flange Material	Stainless Steel
Tubing Material	Schedule 10 Stainless
Primary Tubing Size	1.25 Schedule 10
Primary Tubing Inner Diameter	1.442"
Primary Tubing Outer Diameter	1.66"
Horsepower Rating	500-1800

Variants
Collector	Cast
Number of wastegates	(D) Dual wastegate
Turbo Scroll	Twin Scroll
Wastegate Flange(s)	Dual Gate 44, 45 or 46mm

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