Company: Forge Motorsport

Audi, VW, SEAT, and Skoda KO4 Upgrade Actuator 2.0 Litre

Product code: FMACVAG06
£159.85 Inc. VAT £133.21 Exc. VAT (VAT will be added during the checkout process) Estimate Delivery


Type: 049 - Type 2

Please select options and qty below:

Check your vehicle compatibility


More info Now you can fine tune your Turbo Actuator to the exact needs of your engine with this complete tuning kit. - Read More

Have A Question? Read Instructions? How to Service your Actuator

Prefer to talk over the phone? Call us +44 1452 380999


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.

Product Reviews

Product Reviews

from on Oct 27th 2020 Verified Purchase
Good product
from on Jun 9th 2020 Verified Purchase
I had boost issues and was not very sure on how to handle it. The team at forge helped me troubleshoot, understand what is the right product for me and the how to install it.
Definitely the best team. Special thanks to Luke Amon for his great help and deep knowledge. Product was manufactured and shipped in two days only.
from on Jan 30th 2016 Verified Purchase
Great product! But wish you could order it with the OEM Green No.8 (5-10psi) spring as well! Have to buy it separate for an extra £13.12 + shipping! :-( The yellow No.10 (9-15psi) spring is too hard for my system. After pre-load installing (3turns) I have a CRAK pressure of 11-12psi which gave me a boost pressure of 23-24psi (1.6bar) and my system is asking for 22psi (1.5bar) max! So I’m over boosting by 2psi (0.1bar). I know the green No.8 spring should fix this problem.
from on Jan 29th 2016 Verified Purchase
Amazing products from Forge as always

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Compatible Vehicles

Click the triangles to find your car make and model. Note that the models listed here have either had the part fitted by us or a customer or they are listed as being compatible on industry parts databases. Where it has not been directly fitted by Forge there will then be a separate May Also Fit tab where the make and model will also appear and which details our no-risk approach to purchasing this product, so it is worth checking there as well.

If you need further assistance, please call us on +44 1452 380999 or email us.

  • Golf
  • Scirocco


Audi, VW, SEAT, and Skoda KO4 Upgrade Actuator 2.0 Litre


Warranty Infomation

The majority of Forge Motorsport products come with a limited lifetime 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 +44(0)1452 380999 or email

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.



UK Mainland

Next day delivery applies to orders processed before 12 noon Monday to Friday, subject to stock availability and geographical restrictions. 'Next day' refers to next working day. We cannot guarantee next day delivery for orders placed after this time. Whilst we endeavour to honour our next day service, next day delivery cannot be guaranteed due to other extenuating circumstances. Full details

Delivery is free of charge for all orders £200 (ex VAT) or over. Products are sent by standard DPD service which is usually a next day service, but can take 2 days in transit. We reserve the right to ship smaller, lower value items via Royal Mail or any other service. (Not including Scottish Highlands, Scottish Isles, Northern Ireland, Guernsey, Jersey, and Isle of Man where charges will vary). 

Europe and Worldwide

Delivery service charges will vary depending on the quantity of product ordered, the related parcel size, and destination postcode. Live shipping rates will be calculated at checkout using ShippyPro and dependent on criteria, you will be given the option of DHL, DPD, or FedEx courier services.

Shipping into the EU - Duty Charge Information

All Forge products are sold with a Delivery Duty Unpaid (DDU) status and an import tariff may apply to your order. Customers will be contacted by the Customs and Excise authority in the destination country regarding payment prior to delivery, and it is important that correct contact telephone number and email information be submitted with the order to facilitate this part of the delivery process. Some couriers are charging an admin fee for shipping into the EU. 

If we detect at checkout that you are located within the European Union (EU), you are eligible for a contribution towards your import duty and tax payments. We can add an additional 20% on the total cost of your order, we will then pay the duty and tax costs above your contribution. This offer will ensure the price you pay at checkout is the total you pay, with no additional charges. It will also ensure you have the fastest possible delivery, with no delays. For more information, please see here

Our shipping methods ensure safe and timely delivery of your new Forge products. For further information on cost and delivery times, please contact Forge using the email address if you require any more information. We reserve the right to change the delivery service and company at any time.

Forge Motorsport ships via either UPS, FedEx, DHL (primarily for outside of UK), DPD (primarily for UK), or any other courier we chose. Other shipping options may be available for an additional fee over and above the actual shipping costs. 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 can assist with most cases.

FAQ's and other info can be found here.

Expert Answers

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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.