Dinan S55 Low Temp Radiator LTR / Charge Cooler Heat Exchanger for BMW M3 F80 & M4 F82 F83 (F8x) - Auxiliary Intercooler Radiator Upgrade, 40mm Core, +60% Coolant Volume, Lower IATs, Anti Heat-Soak, Track-Ready Cooling

Dinan S55 Low Temperature Radiator Upgrade for BMW M3 F80 and M4 F82 F83

Keep charge temps in the sweet spot and stop power fade on your F8x. This Dinan low temp radiator for the S55 turbo straight six massively improves thermal management so your M car pulls hard run after run, on the road, on the dyno and on circuit. If you are chasing consistent performance, faster recovery between pulls and repeatable power in hot conditions, this upgraded charge cooler water radiator is the proven answer.

Why it belongs on every F8x

The factory charge cooling system can get overwhelmed during repeated wide open throttle. Once intake temperatures climb, the ECU trims ignition advance to protect the engine and you feel the pace drop off. Dinan’s uprated low temperature radiator increases coolant capacity and heat rejection so the S55 stays in its ideal window for longer, delivering crisp, reliable acceleration without the usual heat fade.

Proven technical gains

• Approximately 60 percent increase in coolant capacity for the charge cooling circuit.
• About 19 percent more frontal area for improved heat exchange.
• 40 mm core thickness, chosen to maintain airflow to the primary engine radiator.
• Average 9° reduction in water temperature feeding the charge cooler across the rev range.
• Average 6° drop in intake temperature across the rev range.
• Power gains of up to 10 bhp and 20 lb ft without calibration.
• Unlocks additional performance when combined with DINANTRONICS Stage 3.

Real world results

Independent testing shows stock setups heat soak after only a few consecutive pulls. With the Dinan low temp radiator fitted there was no heat soak even after seven back to back runs. We have installed and used this upgrade on customer F8x cars and the feedback has been outstanding for daily use, spirited B-road driving and track days. Expect stronger, more consistent acceleration and far less timing pull as the laps or pulls add up.

Key reasons to choose this upgrade

• Direct replacement auxiliary radiator for the S55 charge cooling loop.
• Significant boost in thermal capacity for stable charge air temperatures.
• Engineered to safeguard airflow to the main engine radiator for dependable cooling.
• Built for sustained high load and repeat abuse.

Vehicle compatibility

F8x S55 applications as supplied:

• 2016 to 2017 BMW M3 F80 Sedan
• 2016 to 2017 BMW M4 F82 Coupe
• 2016 to 2017 BMW M4 F83 Convertible

Ideal customers

• Owners seeking an S55 low temperature radiator, LTR upgrade or auxiliary charge cooler radiator.
• Track day drivers and fast road enthusiasts who want consistent intake temps and reliability.
• Tuned or stock F8x cars aiming to minimise timing reduction and protect performance.

Installation and support

Professional fitting is available at MJ Modifications in Warwickshire. For a fitting quote or to discuss complementary cooling hardware for your build, email info@mjmodifications.co.uk.

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