Thread: Forge Wastegate Actuator Introductory Sale

First up is the all new wastegate actuator for the 2.0T Coupe.

$200 plus applicable taxes/shipping.

This product is on the shelf and ready to ship immediately, pending the customers spring selection.

Forge Motorsport | Genesis Coupe Adjustable Wastegate Actuator

- billet aluminum and stainless steel construction
- Viton silicone o-ring sealed piston-based internals - no diaphragm to fail
- 4 interchangable internal base spring pressure ranges
- fully rebuildable
- lifetime warranty

You will have your choice of base spring pressure ranges that must be specified when the order is placed. An actuator spring tuning kit is available for $30 (includes remaining 3 springs), and individual springs are $16 each.

5-10 PSI
10-15 PSI
14-18 PSI
19-24 PSI

(cracking pressure - fully open pressure)

Bear in mind that the units do not come pre-adjusted from us, and will need to be dialed in to the users desired base boost level. Also consider that increasing the boost output of the application may require the ability to supply additional fueling or recalibrating the software to accomodate the desired increase in boost.

We have not yet conducted before and after dyno tests of the Genesis coupe unit, and results will vary based on the spring pressure chosen, the adjustment level, and other supporting modifications, however, our testers have reported significant gains in boost output and a noticable improvement in the power delivery of the car.





On other applications, we have seen gains in excess of 40 whp and torque.

Evo X Dyno Graph - http://farm3.static.flickr.com/2425/...1b3369bc_o.png

Nissan GTR Dyno Graph - http://farm3.static.flickr.com/2724/...92c43040_o.jpg

How it works:

The higher than stock base spring pressure within our replacement units allows for the wastegate flapper to be held closed tighter and for longer against the exhaust gas pressure flowing through the turbo.

With the weaker spring of the stock unit, the exhaust gas pressure can sometimes force the wastegate flapper open prematurely. When this occurs, the exhaust gas that is supposed to be spooling the turbo is dumped, which will subsequently slow the speed of the compressor wheel and limit the potential to make boost in the most efficient manner.

Tightening the stock actuator and adding preload to the stock spring will have the same effect as our replacement, as many people are finding with wastegate tweak mods, but to a much lower degree. You're working with an altogether weaker base spring pressure to begin with. Somewhere in the neighborhood of 7-10 PSI base pressure.

Consider that by increasing the boost pressure entering the motor on the intake side of the system, you will see a similar and corresponding increase in exhaust gas pressure that is exiting the motor into the exhaust manifold to spool the turbo. It is a common practice to upgrade the bypass valve to a stronger unit that will better support the increased boost pressure on the intake side, however, you need to also increase the spring tension of the wastegate actuator to better contain these higher exhaust gas pressures as well.

We can assemble our units with any one of 3 different base spring pressure ranges stiffer than stock, so the possibility of the exhaust gas pressure prematurely opening the flapper against this higher spring pressure is minimized, if not completely eliminated.

All of the exhaust gas is then kept within the exhaust housing of the turbo and is forced to continue spooling the wheel keeping boost at it's peak potential at all times.

A boost controller, mechanical or electronic, and including the stock boost control solenoid will still allow you to adjust up from the base actuator spring pressure, and it will open the actuator when the target boost pressure is reached, but with the stock unit, there is still the potential for the exhaust gas pressure to prematurely force open the wastegate BEFORE the target boost is reached and the boost controller would send the signal to open the actuator.

With our unit, the boost controller will still function in the same way, sending the pressure signal to the actuator to open it fully when the target boost level is reached, but there is far less chance of the exhaust gas pressure opening the flapper before that occurs.

Depending upon which base spring pressure is used and how the units are adjusted, you may see changes like quicker spool, less tapering, and an overall increase in the area under the boost curve.