- Description
- Product Reviews
- Compatible Vehicles
- Instructions
- Warranty
- Shipping
Description
Product Description
A turbo actuator for the Vauxhall Astra SRi/GSi/VXR with the Z20 engine and K04 turbo.
Forge Motorsport were one of the first company’s in the world to design and manufacture the billet two-piece replacement aluminium turbo actuator. Originally for the Cosworth, Renault 5 GT turbo, and Lancia Integral turbos, we soon developed the largest and most diverse range of actuator replacements.
- Choice of spring pressures to suit your car
- Manufactured from 6026 grade aluminium
- Vehicle specific
- Turbo specific
- Built to order
- Machined and hand polished in the UK
- Choice of piston or diaphragm operation on most actuators
- Nomex reinforced flurosilicone diaphragms
- Laser cut stainless steel brackets (where applicable)
- Tuning and service kits available
- Made in England
- Lifetime warranty*
Please Note:
The pressure figures listed in the drop-down menu above are minimum regulated pressure figures. If you are unsure, please don't hesitate to call us on 01452 380999.
When you fit a Forge turbo actuator you will be able to fine tune and manage your specific boost requirements, this will allow for improved response and better control. This product is built with a predetermined actuator spring suitable for, or slightly above factory boost levels. The actuator can be assembled with a stronger spring upon request for tuned vehicles, and where a higher boost level is required. Please contact us directly concerning this process. It is designed and built with the intention of increasing the boost output of a turbocharged system. We cannot guarantee compatibility with all applications, nor the ability to increase the boost output beyond a level that is within the parameters set by the engine-management-system of the given vehicle at the time of installation, whether that system is factory or aftermarket
Diaphragm sealed internals are the default selection for this actuator product but customers now have the option of piston sealed internals. Unique to Forge Motorsport, this innovation offers equal performance to the diaphragm type and low maintenance due to the hard wearing nature of piston sealed valve internals.
Forge Motorsport nor any of its authorised distributors can assume any responsibility for any adverse effects resulting from the installation and tuning of this product onto a vehicle whose engine-management-system, whether factory or aftermarket, is not capable of allowing for the desired level of adjustment. While Forge Motorsport is happy to supply you with an actuator capable of holding boost beyond that of your factory unit we are in no way capable of knowing nor suggesting that your vehicle's engine or related systems are capable of supporting or surviving the stresses of such elevated boost pressure.
In The Box:
1 x FMACAVXR actuator
1 x Forge Sticker
This actuator is built with a stock spring as standard. If you require the FMPACTUN spring tuning kit seen in the associated products below, you will need to select the Diaphragm Type 2, 049 option.
All actuator rods are manufactured from 303 grade stainless steel.
Please note that the quoted spring pressure against the various colour codes relates to the mechanical aspect only, applicable to earlier turbocharged engines that are not ECU/solenoid regulated.
However, modern ECU/solenoid engines do not require the target boost pressure to be matched pound for pound by the quoted mechanical specification of the springs we offer. Please take advice from an appropriately qualified tuner if you are unsure of the correct spring application for your model and the planned level of tuning.
For our T2 spring range (FMAS049):
Check your vehicle compatibility: Click here
Please Note: In line with our policy to constantly review, revise, and improve our product range, the appearance of the product you receive may differ from the one advertised.
Product Reviews
Compatible Vehicles
Instructions
Warranty
Shipping
Expert Answers
Hi I’m just wondering. I’m looking to buy a actuator My car over boosts to 20psi and then sits at 16psi/17psi. What colour of spring do I need
Hello we would recommend a green spring on a stock or stage one vehicle , if you are going to tune the car on a Dyno with a custom map we would recommend purple.
Hello can you explain to me difference between piston and diaphram please? Which one is better? Thank you
The choice between diaphragm and piston is a matter of personal choice (both types are the same price) and I have included the explainer below to help you decide.
Piston type actuator vs diaphragm type actuator (explainer)
- Wear and tear/reliability
Roughly 95% of UK/EU actuator sales are for the diaphragm type, but the USA Forge Motorsport branch supply the piston type only to the markets they serve. We have been supplying the piston type to the USA for 15 years and related service kits are significantly low in comparison to the diaphragm type, testament to the wear and tear quality of the piston type.
- Performance
From a performance perspective It is difficult for us to recommend one type over the other as their performance is very much the same. There is a school of thought that suggests the diaphragm type is quicker to respond, but from our perspective the difference is negligible.
We do have reports of the piston type sticking in sub-zero temperatures and this seems to only occur on start-up but is apparently quickly overcome by rising vacuum pressure/turbo heat. We have little information on this “problem” as the reports are few, suggesting it is not a common occurrence
Hi my vxr is currently stock ecu wise, it’s going stage 2 in the very near future and I’ve been recommended to get a diaphragm actuator, I’m guessing the Green stock one would be the one for me, but I’m not sure?
Correct, please use the stock equivalent green unless the mapper you plan to use requests a stronger spring option (see full list of spring options below).
RED 17 psi (1.1 bar spool up/opening pressure) - 20 psi (1.4 bar running pressure/full stroke), product code FMAS049R.
BLUE 14 psi (0.95 bar spool up/opening pressure) - 18 psi (1.2 bar running pressure/full stroke), product code FMAS049B.
YELLOW 9 psi (0.6 bar spool up/opening pressure) - 15 psi (1 bar running pressure/full stroke), product code FMAS049Y.
PURPLE 7 psi (0.5 bar spool up/opening pressure) – 13 psi (0.9 bar running pressure/full stroke), product code FMAS049PS.
GREEN 5 psi (0.35 bar spool up/opening pressure) - 10 psi (0.7 bar running pressure/full stroke), product code FMAS049G.
Hi, I have a astra h vxr running 22 psi. I was thinking about getting a new actuator... What spring would you recommend? Thanks
Hello, thank you for you question, you would need a red spring for your application.