Company: Forge Motorsport

Uprated Small Spring (Single)

Product code: FMSS114
£7.55 Inc. VAT £6.29 Exc. VAT (VAT will be added during the checkout process) Estimate Delivery

Please select options and qty below:

Check your vehicle compatibility

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


Product Description

These are the individual springs sold in our FMTVTUN kit. Please select the colour you require using the options above.

Valve Spring Colour Coding: The weakest spring is GREEN, followed by YELLOW, BLUE, and RED which is the strongest. Depending on the supplied original fitment, this represents an increase of 25%, 50%, 75%, and 100% respectively.

The standard spring option is for customers who wish to replace a broken idle spring in their twin piston atmospheric dump valve.

*The above should only be considered as a guideline*

Note: Serious or fatal damage may occur to the engine and associated components if this product is incorrectly matched to the individual engine requirements. Forge Motorsport nor any of it’s Authorised Distributors can assume any responsibility for any adverse effects resulting from the installation of this product.


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 Aug 26th 2019 Verified Purchase
Bought the blue spring, very good quality! Would definetely recommend!
from on Feb 24th 2019 Verified Purchase
Fast service good products A+++
from on May 17th 2018
Very fast service. Second to none. Ordered whilst I was away on holiday in Croatia. Was excited when I received it fitted it to my forge dump valve sounds amazing. Will definitely be ordering other products. No fuss whatsoever.
from on Mar 24th 2018
Excellent service,. super fast delivery,.. my spring had gone weak so a replacement was necessary restoring it back to normal without issues,..
from on Jul 25th 2017
Superb customer service with great knowledge and problem solving. Great and fast delivery options to get the goods moving fast when needed !! Highly recommended, Thanks John, my Mini runs now with no issues !!
from on Oct 27th 2016 Verified Purchase
Excellent customer service and knowledgeable staff, I ordered the incorrect part and this was sorted quickly with a minimum of fuss. Would recommend for sure
from on Jul 9th 2016
Great service, top quality product & fast delivery.
from on May 11th 2016
Great service and fast delivery, was cheaper to buy directly from Forge than buying it elsewhere.

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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.



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, will this fit Renault Megane 4 rs 1.8T with forge blow off valve upgrade?

Yes, the blue colour code FMSS114 being stock equivalent and the red FMSS114 for the stage 1 and stage 2 tuned Renault Megane RS 280 & 300 Mk4 models fitted with the blow off valve with product code FMDV23A.

Hello would this fit , an Ford fiesta ST180 product code : FMDVST180

Hi Ashley, thank you for contacting us.

Yes this spring will fit the FMDVST180.

Is this for the FMDVST180?

Hi Ashley, yes those spring types will fit that valve :)

Hi, i have a blow off valve for subaru wrx sti 2003 year. My blow off have two spring but the smallest spring is broken Is this the right replacement?

This is  the correct spring 

Hi there I am looking for the small spring in the fmwrx301 as mines is broken an I am looking to replace it

Hello. You will need this spring (FMSS114) and to select 'Standard Spring' which is suitable for the FMWRX301 

Hi, is this the correct (smaller of the 2 springs) for the megane 225 RS dump valve as mine has snapped?

Hi Richard, yes sir that the correct spring. Its either a Yellow or Blue blue depending if your car was mapped or not.

Hi.i have a Volvo S80 2.5t and it have a forge external like FMDVK04S. Its like that. I want a spring. The spring is 26mm and 25mm. Did you have something like that

Correct, single springs can be ordered under the product code FMSS114, and the complete spring tuning kit can be ordered under the product code FMDVTUN, both quoted spring products compatible with the valve with product code FMDVK04S.

Does this fit a Forge Motorsport Subaru WRX blow off valve?

Yes this the FMSS114 (standard option) is one of two internal springs found in the Forge Motorsport win piston dump valves we offer for the Forge Motorsport twin piston blow off valves (more specifically Subaru blow off valve valve product codes FMWRX301, FMDVSUB01, FMDVV5012, FMDVV4010 and FMDVK013A). The FMSS114 is the smaller of the two internal springs, otherwise referred to as the idle spring.

If needed the main boost spring (larger of the two internal springs) for the range of Subaru valves quoted can be ordered under the product code FMDVSU110, the blue option being the fitted spring for standard engines.