{"product_id":"m177-auxiliary-performance-radiator","title":"M177 Auxiliary Performance Radiator","description":"\u003ch3\u003eThe oversized auxiliary radiator that pulls double duty.\u003c\/h3\u003e\n\u003cp\u003eM177 vehicles run two of these small side radiators — one supporting the intercooler circuit, one supporting the engine. Our oversized, reversible replacement upgrades either side: run it on the intercooler side to knock down intake temps, or on the engine side to drop coolant temps 9-12°F. Pair it with our \u003ca href=\"\/products\/c63-performance-intercooler-radiators\"\u003emain intercooler radiator\u003c\/a\u003e for the full measured result.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eMeasured results, not marketing claims:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCombined with our main radiator: \u003cstrong\u003e54% lower peak intake air temps (−30°F)\u003c\/strong\u003e after 5 successive 60–130 mph pulls\u003c\/li\u003e\n\u003cli\u003eMounted engine-side: \u003cstrong\u003e9-12°F lower engine coolant temps\u003c\/strong\u003e, pull after pull\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReversible design\u003c\/strong\u003e — mounts to either side of the vehicle\u003c\/li\u003e\n\u003cli\u003eProprietary oversized core design\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMade in the USA\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eBuild your cooling system:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStage 1\u003c\/strong\u003e — \u003ca href=\"\/products\/c63-performance-intercooler-radiators\"\u003emain intercooler radiator\u003c\/a\u003e: 45% \/ −25°F IAT reduction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStage 1.5\u003c\/strong\u003e — main + this auxiliary radiator: 54% \/ −30°F peak IAT reduction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStage 2\u003c\/strong\u003e — the \u003ca href=\"\/products\/w205-c63-performance-radiators-stage-2-kit\"\u003ecomplete 3-piece kit\u003c\/a\u003e: main + both auxiliaries. \u003cstrong\u003eBest value — saves $190 vs. buying the pieces separately.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eVehicle Fitment:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2015-2021 Mercedes-Benz C63 AMG\u003c\/li\u003e\n\u003cli\u003e2015-2021 Mercedes-Benz C63 AMG S\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eInstallation Notes:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis product requires vacuum filling per the official Mercedes work instructions and should be carried out by a reputable mechanic with the proper tools. Failure to properly install will lead to inferior results.\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eDetailed Write-up:\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003e\u003cbr\u003eOn our C63s, we have 3 front-facing radiators that serve multiple purposes. The primary center and LHS (driver's side in the USA) work together to cool the intake charge temperatures as well as the transmission simultaneously. As your transmission warms up, it directly affects your intake air temperatures — which isn't ideal.\u003cbr\u003e\u003cbr\u003eTo combat this rise in temperature, we custom designed single and dual radiator options from the ground up. We explored multiple avenues, performed multiple iterations of testing, and came up with a solution that is proven to reduce undesirable temperatures. We partnered with one of the best radiator core companies in the world to optimize heat rejection, which translates to lower intake temps and a happier transmission.\u003cbr\u003e\u003cbr\u003e\u003cem\u003e\u003cstrong\u003eTest Method:\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003e\u003cbr\u003eWe went through multiple rounds of testing with over 5 different concepts to arrive at the product shown below. We varied core thickness, fin and tube sizing, water routing and end tank design to arrive at our final configuration.\u003cbr\u003e\u003cbr\u003eOur final testing was done in the Texas summer heat (90-95°F) at close to 4000DA with our hybrid turbo setup running 27+ PSI of boost. This combination of high ambient temps with high boost greatly stresses the components the intercooler system is trying to cool. Each test was done with successive rolling pulls, with approximately 60 seconds between each run. This causes the entire system to heat soak and progressively get hotter after each pull. All of the data shown below starts at Run 2 — we did this to normalize the results and pre-stress the system equally between each configuration, ruling out variances due to starting temperatures and transmission warm-up.\u003cbr\u003e\u003cbr\u003e\u003cem\u003e\u003cstrong\u003eStock Baseline:\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003e\u003cbr\u003eWith the completely stock system, we tracked IATs pull after pull. We measured average and peak intake temperature per 60–130 mph run to obtain a holistic picture of how the stock system performs. The system rises 8-14°F per run, and by the 4th run the car was running poorly with massive timing pulls due to high intake temperatures. We planned to do 5 pulls, but the power loss was so bad we could not manage 5 back-to-back pulls and had to cut the test short.\u003cbr\u003e\u003cbr\u003e\u003cem\u003e\u003cstrong\u003eStage 1 Results: Main Radiator\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003e\u003cbr\u003eThis option replaces the primary radiator with our Stage 1 model. It shows significant intake temperature reductions and greatly improved heat soak mitigation. We partnered with PWR to custom design our core, using a proprietary fin arrangement, fin density and coolant tube design. We also rerouted the entry coolant passage and converted the system from single-pass to triple-pass. With these enhancements, we reduced IATs by 45% and 25°F after 5 successive pulls — and kept putting down power without pulling timing like the stock system.\u003cbr\u003e\u003cbr\u003e\u003cem\u003e\u003cstrong\u003eStage 1.5 Results: Main and Auxiliary Radiators\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003e\u003cbr\u003eThis option uses our main core plus the additional auxiliary cooler on the left-hand side. The main and auxiliary cooler together achieved peak IAT reductions of 54% and 30°F at the 5th run.\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0361\/7318\/5164\/files\/avg-iat-chart.png?v=1787570672\" alt=\"Average intake air temp above ambient: stock radiator climbs to 55°F above ambient and forces the test to stop, while ModalWorks Stage 1 and Stage 1.5 hold roughly 25-30°F above ambient across five 60-130 mph pulls\"\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0361\/7318\/5164\/files\/max-iat-chart.png?v=1787570672\" alt=\"Peak intake air temp above ambient: stock radiator peaks 61°F above ambient by run 4, while ModalWorks Stage 1 and Stage 1.5 stay near 34-39°F above ambient — a 27°F cooler peak\"\u003e\u003cbr\u003e\u003cbr\u003e\u003cem\u003e\u003cstrong\u003eStage 2 Results: Main, Auxiliary and Auxiliary Engine Radiator\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003e\u003cbr\u003eOur auxiliary coolers are reversible and mount to either side of the vehicle. On the right-hand side, the auxiliary cooler acts as an additional engine radiator, consistently reducing engine coolant temps by 9-12°F pull after pull.\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0361\/7318\/5164\/files\/ect-chart.png?v=1787570672\" alt=\"Engine coolant temp above ambient: ModalWorks Stage 2 runs up to 12°F cooler peak coolant temps than stock across five back-to-back pulls\"\u003e\u003c\/p\u003e","brand":"ModalWorks","offers":[{"title":"Default Title","offer_id":39933934633100,"sku":"MW-C63-COO-RADAUX-V1","price":1095.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0361\/7318\/5164\/products\/PhotoRoom_20211203_150822_b0da54f5-e383-4db4-847d-a50147998926.jpg?v=1641825189","url":"https:\/\/modalwork.com\/products\/m177-auxiliary-performance-radiator","provider":"ModalWorks","version":"1.0","type":"link"}