Part No: T9103

Mach 2 T9103 TMS Recirculating Diverter Valve Direct Fitment

Warning

GFB recommends that only a qualified automotive technician fit this product.

This product is intended for racing use only, and it is the owner's responsibility to be aware of the legalities of fitting this product in his or her state/territory regarding noise, emissions and vehicle modifications.

GFB products are engineered for best performance, however incorrect use or modification of factory systems may cause damage to or reduce the longevity of the engine/drive-train components.

Instructions

T9103 instructions rev2.pdf

Specific Product Information

What's Included

1 x valve
1 x 5mm hex key
2 x mounting screws
1 x WRX recirc flange (installed)

Product Range Information

Features of Mach 2

Capable of handling upwards of 110psi.
Simple, direct bolt on kit. Includes all accessories required for installation.
Utilises GFB’s TMS technology.
Configured to be full recirculation, however, can be configured to be full atmo (kit sold separately).

Use Cases

Compatible with vehicles that utilise a hose type flange/flange mount pneumatically actuated bypass valve from factory.
For other use cases or if aftermarket intercooler piping is used, please contact us to confirm fitment.

Self-troubleshooting Steps

I feel like I am experiencing a loss of power/boost. What can I do to diagnose this?

If you feel like you’re experiencing a loss of power/boost as a result of the BOV, it’s worth noting that this can only be caused if the valve is prematurely venting (opening) under boost conditions. On a Mach 2, a softer spring is used in comparison to our other valves that are capable of venting to atmosphere – this means that the piston in the valve will slightly open whilst on throttle or at idle. This, however, is completely normal and is behaviour that is exhibited by your OEM bypass valve as well. This may mean that you will need to revisit and double check that all your intercooler piping as been reconnected correctly. More often than not, a hose that is not reconnected properly can caused this and is not as a result of the Mach 2.

How do I diagnose my valve?

With the valve uninstalled from your vehicle, inspect the body of the valve, and look for any visible signs of damage. The anodising on the body should still be black and not scored. Next, ensure that all O-rings, recirc outlets and the vacuum nipple are undamaged and in good condition.
If something looks to be damaged or abnormal, please be sure to contact us at [email protected] and we’ll be sure to provide the relevant information and resources on how to proceed next.

FAQ

What is the difference between your blow off valve range? I’m not too sure what I need.

The only key difference among our blow off valve range is the level of adjustability when venting to atmosphere. They all have the same performance related benefits. The factor that separates our blow off valve range is the level of adjustability between venting to atmosphere and recirculating back into the intake. The Mach 2, alike the OEM bypass valve, is our fully recirculating OEM replacement and will not vent to atmosphere. However, if you were after something that was capable of venting to atmosphere, we do have the Hybrid, Respons and Deceptor Pro II valves available.

Out of the three, the Hybrid is least adjustable; with only three venting profiles being able to be achieved including: full recirc, 50/50 and full atmo. The Respons and Deceptor Pro II valves, however, are fully adjustable with any outcome between full recirc and full vent to atmosphere being able to be achieved. The Deceptor Pro II also has the added benefit in being able to have its venting bias electronically controlled through a head unit from the comfort of your vehicle cabin compared to the Respons, which will need to be manually adjusted.

How can I make some noise! Is that possible?

Yes! It is possible to convert your Mach 2 from full recirc to full atmo. In most cases, you will simply need to purchase a Mach 2 atmospheric conversion kits. In this kit, we provide a stiffer spring, trumpet to replace the recirc outlet and recirc hose plug. The stiffer spring is required to ensure that the valve does not prematurely vent to atmosphere.

Can I convert my hose mount valve to a flange mount (or vise versa)?

Unfortunately, no. This is due to the bodies of the flange mount valve differing to the those on the hose mount valves. Because of this, it’s not possible to convert from one style to another.

I’ve just performed a smoke test and have found a boost leak from the recirc port.

When smoke testing a dual port blow off valve, it’s worth noting that they will often show a false positive indication for a boost leak. This is because, when performing a smoke test, they pressurise both the inlet and outlet of the valve – when the recirc port of a dual port BOV is not designed to (and doesn’t need to) hold pressure. We’ve talked about diagnosing boost leaks in numerous tech articles and videos that can be found on our YouTube channel or on our website.

I have aftermarket intercooler piping, is it possible to fit one of your valves onto my vehicle?

Yes! It definitely is possible. We do have a range of V-band weld on adaptors available in both Stainless Steel and Aluminium finishes. It is also worth noting that the V-band weld on adaptors are only compatible with our valves with a hose mount and not a flange mount.

I’m interested in rebuilding my valve, do you offer rebuild kits?

Yes, we do. Generally however, we always recommend contacting us first to see if a rebuild kit is generally needed. In most cases, we’re able to provide a solution without having to purchase any other accessories.

I’ve lost my spring preload screw, what do I do?

If you’ve accidentally misplaced or lost either your spring preload screw or installation tool, please do not hesitate to contact us to source a replacement. These are custom made screws and are not able to be obtained elsewhere.

Do I need to purchase a gasket with these?

Not at all! All of our flange-type BOVs come pre-installed with an O-ring for a better seal, and improved reliability over the standard gasket.

Tech Support and Warranty

Warranty Information

We offer lifetime warranty on all of our products, so provided that there is a genuine manufacturing or assembly fault with your product – please send us some photos of what’s going on so that we’d be able to assist with either replacement parts or components. It’s also worth noting that we our lifetime warranty does not extend to those who have purchased our parts second hand.

Contact Us: https://gfb.com.au/contact-us/

If you are still having some trouble, then the next steps are to contact our Tech Support team. Videos, photos and a clear description of the symptoms you are experiencing would give us a better understanding of what is going on and how to resolve this issue as quickly as possible. Remember, we can’t see your car or product, so our diagnosis is only as good as the information you provide us.

Downloads & Installation

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