Company: Forge Motorsport

Intercooler for Toyota Corolla GR

Product code: FMINT34
£861.72 Inc. VAT £718.10 Exc. VAT (VAT will be added during the checkout process) Estimate Delivery


Product Description

  • Gains of 10bhp and 10lbft
  • Temperature drops of up to 20C
  • Reduced turbo lag, increased response
  • Greater overall surface area for greater heat dissipation
  • Utilising a race specification Tube and fin construction air core
  • High flow cast end tanks ensuring optimum air transition for cooling efficiency
  • Dyno proven horsepower and torque gains
  • A smoother power curve
  • Volumetric increase of more than 100%
  • Frontal area increase of over 40%
  • Includes necessary hardware and instructions for installation
  • Lifetime warranty

Following on from our successful launch and testing of our intercooler designed for the Yaris GR our customers reached out to us for a cooling solution for the Corolla GR. FMINT34 is a performance intercooler for the Toyota Corolla GR. This part replaces OEM part number JD127000-1451.

The Corolla GR is currently not available for the UK market so we worked closely with our USA branch to bring a solution to market that has been designed at our headquarters in Gloucester UK. Throughout the development process we have strived to improve the efficiency and performance of the Corolla GR’s engine; our project brief was to develop an intercooler utilizing all the available space available in the original position of the OEM intercooler, and to ensure the inlet air temperature is reduced, without any negative effects on the boost pressure or engine and transmission cooling.

Using a combination of scanning software and traditional measuring methods the design was created. This was then fine tuned by our flow dynamics simulations team (CFD), and the end tanks were initially created by 3D printers. We then alloy cast our first prototypes from our 3D prints using a sand casting technique and started the testing procedure on several types of intercooler cores.

In order to fit the designed intercooler to the Corolla GR's platform we designed spacers to fit behind the Corolla GRs OEM crash bar, this results in no cutting of the vehicle and ensures the modification is 100% reversible along with helping to fit the deepest performance core behind the GRs OEM bumper. The spacers are manufactured from 6082 aerospace billet alloy and anodized for surface protection and longevity. The first iteration fitted the vehicle perfectly, however our technicians and engineers felt the inlet and outlet should be enlarged along with providing the end user with the necessary boost pipes to ensure flow was maximized on the Toyota`s GR 3 cylinder engine.

Before getting to work on the DYNO we specked three different types of cores, one of these being Bar and Plate and two being a tube and fin construction with all three cores having different internal and external fin pitches and configurations. We then welded the test parts ready for testing along with fabricating an internal baffle to the inlet (hot side) of the end tank, this is to ensure, from our CFD research, that the total volume of the core internal is utilized for optimum performance.

Why do we test different cores ?

Here at Forge Motorsport, when developing an intercooler, we will test several different cores for each application. For example, a bar and plate style core, a tube and fin style core along with different fin pitches and heights i.e. 22 fins per inch or 17 fins per inch as well as changing the internal fin pitches/shapes and density within the tube enabling to fine tune the amount of pressure drop the intercooler produces.

Pressure drop is not always a bad thing, as our testing and research has proven on various projects, this is because the pressurized air velocity is being stalled by the pressure drop within the cooler thus allowing more time to cool the air within the cooler itself, as air passes through the non-pressurized face of the core, that is open to the atmosphere. Too much pressure drop can of course have a problem on the higher performance engines as the intercooler reaches its maximum efficiency the turbo has to work a lot harder to force the air through the core. This in turn creates higher inlet air temps (IAT’s) due to the turbo creating more heat as it is over stressed and worked harder. No pressure drop can also prove to be inefficient as the cooler will not lower the charge temperature again resulting in higher inlet air temperatures.

Dyno Results

Testing was completed in the UK on a Yaris GR at Litchfield’s Maha dyno, manufactured by the same people who currently supply BMW M Sport and Mercedes Benz for all their engine calibration and dyno testing. The vehicle used for testing had a full turbo back exhaust along with a DT UK Tuning box. Our first run with an ambient air temperature of 19.5°C, gave results of 301.3 BHP and 286.4 lbs/ft of torque. Later after the 3rd pull on the dyno, the inlet air temp quickly increased to nearly 58°C, with the BHP and torque both decreasing to 295bhp and 278 ft/lbs. 

Our first test Forge intercooler was on our bar and plate design core. The weather on this day was hotter with an Ambient dyno cell temperature of 22.1 degrees , on our third DYNO pull on the bar and plate the intercooler the yields where 304.4 BHP and 295.5 lbs/ft of torque as shown in the graph below. The inlet air temp is highlighted in pink, and shows the intake air temperature reduced to 44°C. So we had achieved a good gain in Torque and a reduction in inlet air temps when the testing environment was actually hotter. 

For our second test we used a very high density external fin pitch core with a tube and fin design. These cores are typically lighter than the bar and plate counterparts. Again the dyno cell ambient air temps here higher than when we tested the OEM intercooler. This time the results showed we had again achieved an impressive reduction in IAT’s with power figures resulting in 304.1 BHP and 297.6 lbs/ft of Torque, inlet air temps on the third pull were no higher than 46°C.

The End Results of our Testing

Our third and final core to test had a slightly smaller thickness than the two previous variants resulting in a slightly smaller volume, and with the hottest test day so far, of all the intercoolers in question at 25.4°C within the dyno cell we were not confident we could improve on the previous results. The results however speak for themselves. On the third pull inlet air temps stayed at a steady 40°C and with the highest BHP gain at 307.3 BHP, and torque peaking at 296.4 lbs/ft. We had found our winning formula. At this point though we do not simply stop, we repeated our testing to ensure our results were true and checked all our test vehicles sensor data to ensure there were no negative effects.

As the hot and cold side, inlet and outlet, have been increased to 60mm, we have included within the intercooler kit all the necessary silicone hoses and hardware to complete the installation, and connect to the OEM parts. Compared to the OEM intercooler, the improved Forge Motorsport product has a surface area increase of over 42% and an internal volume increase of over 100%. Gains of more than 10bhp and 10 lbs/ft. These gains can be even higher depending on your vehicles state of tune and complementing performance products like Forge Motorsport’s FMTIA8 and FMINDK43, with the inlet duct FMINLD1.

The Forge Motorsport intercooler is a perfect performance enhancing product that fits directly to the OEM mounting points, making for an easy install, in a relatively short period of time. No cutting of any components are needed, making the installation reversible if the vehicle needs to be returned to stock at any time in the future. The core and end tanks are finished in our black textured anti corrosion coating that also aids with its thermal properties and keeps the product looking that bit more stealthy or OEM+. The Forge Motorsport lifetime warranty on all hardware products shows the trust we have in the quality of our products while they are being enjoyed on your pride and joy.

Complimentary Products


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

Be the first to review this product

Want to leave a review?

Login Register FREE!

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.



Intercooler for Toyota Corolla GR


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 £100 (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.

Expert Answers

Submit Question Cancel
Submitted questions may be published on the website.