Description
Product Description
A replacement turbo actuator for vehicles based on the MK5 Golf chassis with the 2.0 FSi engine.
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 FMACVAG06 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.
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Compatible Vehicles
Instructions
Audi, VW, SEAT, and Skoda KO4 Upgrade Actuator 2.0 Litre
Warranty
10 Year Warranty Information
The majority of Forge Motorsport products come with a limited 10 Year Warranty (brakes pads excluded). All warranty claims must be accompanied by the original proof of purchase to enable us to help you. Failure to supply this proof will result in your claim or enquiry being denied.
For further information, please call our customer service team on +49(0)3222/1097-308 or email info@forgemotorsport.eu.
Do not use aggressive (acidic) car cleaning products, particularly traffic film remover solutions or shampoos to clean your intercooler, radiator, or oil cooler. The use of these products can damage Forge Motorsport cooling systems and invalidate your warranty. These are often found at car washes. A light, warm, soapy solution (free of harsh acidic cleaning compounds) should be used to clean you cooler and thoroughly rinsed away. We recommend that you should inspect your product on a regular basis for bent and/or crushed fins. Any bent fins should be carefully straightened to allow ambient air to pass through the core face. At the time of installing your Forge radiator, an approved coolant must be used and added to the coolant system. Be sure you never mix coolant and always use distilled water.
This warranty does not apply to any defect in the goods arising from fair wear and tear, wilful damage, accident, negligence by you or any third party, use otherwise than as recommended by the supplier, failure to follow the supplier’s instructions, or any alteration or repair carried out without the supplier’s approval.
Shipping
European Shipping
We ship to selected EU countries as displayed during the checkout process.
Delivery service charges will vary depending on the quantity of product ordered, the related parcel size, and your destination.
Our shipping methods ensure safe and timely delivery of your new Forge products. For further information on cost and delivery times, please contact us if you require any more information via our contact page.
We reserve the right to change the delivery service and our shipping providers at any time.
Once a product has left our warehouse and is in the possession of the shipping company, any claims must be made directly with that shipper, however we may be able to assist in some cases.
FAQ's and other info can be found here.
Manufacturer & EU Contact Details
Manufacturer
Company Name: Forge Motorsport
Address: Unit 1A, Ashville Trading Estate, Gloucester, GL2 5EU, United Kingdom
E-Mail: info@forgemotorsport.co.uk
Phone: +44 1452 380999
EU Responsible Person
Company Name: Milltek Sport GmbH
Address: Gottlieb-Daimler-Str. 1-3, 53520 Meuspath
E-Mail: info@millteksport.de
Phone: +49 (0) 3222 1097308
Expert Answers
Hi there, have an 2012 Audi S3 8p which I am planning to remap to stage 2.5+ (remap, intercooler, exhaust, intake fuel return valve, and high pressure fuel pump) during the fall. Should I go for the red spring or just go for yellow since boost is controlled by ECU?
We recommend the yellow spring; stronger springs require custom mapping as part of extensive hardware tuning for this model/turbo.
Hello there looking to buy actuator for my mk5 gti which has ko4 turbo fitted car is remaped but ecu controls boost so should I just get yellow spring running 1.5 bar of boost
Yes, we recommend the yellow spring in the MK5 Golf with KO4 turbo fitted (stronger springs tend to induce overboosting in mapped engines unless custom mapped/modified to suit).
Hello, I need a new actuator for my mk6R because mine does not want to build vacuum probs. membrane went bad…I dont know which one to order my car is golf 6 R 270hp stock maybe I will do stage 1 but I dont know which actuator to order if u can help me…thanks alot
The FMACVAG06 is the correct actuator for the 2.0 Golf MK6 R and we recommend the yellow spring to compliment both standard, stage 1 and stage 2 level tuning. The type of actuator internals are a matter of personal; preference and I have included an explainer below to help you make the decision. Also included are notes regarding the spring consideration which I have included as an explainer against our yellow spring recommendation. The note suggests you should approach the tuner who is going to carry out the stage 1 tuning but we have extensive customer feedback from customers regarding FMACVAG06 application and the yellow spring recommendation is advised against supporting history.
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.
Website note (spring information - generic)
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 appropriate spring strength for your model and/or the planned level of tuning (tuning software varies and complementary spring tuning advice must be sourced from the tuners who understand the quasi-mechanical aspects of the engine in question).
Hi, I have a Audi S3 8p, I currently seem to have boost issues where it seems to dive in an out of boost, I’m currently has a stage 2+ remap running ~350hp with was done 7 years ago by the previous owner, was wondering if this could potentially could help with this / help with the future map being done by R-tech. If so what do you recommend as not sure on what a piston or diaghrpham type Actuators are? And what spring should be used? Am I better going up to the purple? Or sticking with yellow? Thanks
I would recommend a diaphragm Type and a yellow spring.
My Car has a k04-064 with your actuator, the previous owner played with the Grub Screw, how will this affect my boost?
Hello, the grub screw in the lower port can be fully removed or left in situ , this will not change how the actuator performs.
My question is as follows: which spring should I choose? I have a Golf 6 GTI Edition 35 with a stage 1 engine.
Please select the yellow spring as this is suited to stock and stage 1 & 2 mapped engines in models with the related KO4 turbo fitted.
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