NA & NB LFX Cooling Kit

$1,015.00

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Out of stock

Lead times vary but typically run 6-8 weeks.

A system designed specifically for the LFX using the same core as our LSx radiator and designed to work with factory fans. The T-3x core is a new FLUIDYNE design which was developed to provide the maximum amount of heat rejection in applications with less than 400 sq. inches of core surface available and where core depth is critical. The T-3x core is a triple-row core, constructed with our high performance 5mm air fin in lieu of the traditional 7-8mm air fin and 5/8"” flat tube.The 5mm air fin allows us to pack additional rows of water tube in each core… essentially providing the cooling performance of a 20% larger core area. This new core [called the Slimline core] with our new Slimline 5/8" tube, measures only 2" in overall depth. Saving up to 2" of clearance over standard conversion radiators. Additionally, the Slimline core is capable of handling significantly higher internal water pressure than traditional radiators with 1” or 1.25" water tubes. The Slimline core is rated at 40 PSI burst pressure so installation of a high pressure radiator cap [28-32 PSI] is recommended which will increase the boiling point of the radiator water from 212 degrees to 230 degrees. Laminar Flow: Fluid travels thru any pressure vessel in a column meaning it leaves a area of stalled water on either side of the column’ of flow. The bigger the inside diameter of the flat water tube, the larger the amount of stalled water alongside the column of flow. This stalled water forms an insulation barrier which inhibits the heat transfer from the water to the inside of the water tube so reducing the amount of boundary layer is always a good idea. By reducing the size of the water tubes and increasing the number of tube rows, the T-3x Slimline core has essentially reduced the overall impact of the boundary layer associated with the Laminar Flow and in doing so, increased the heat rejection properties of the radiator. Note: The radiator is designed to work with NB style mounts. The radiator will mount in NA cars with use of NB mounts or custom mounting. This is done because of tank expansion. Side tank aluminum radiator expand upwards of .200″ when hot. Utilizing side mounts like the NA can cause additional pressure against the end tanks and cores. NB mounts can be source from salvage yards or dealers. We do have plans to produce a mount solution in the future. The radiator is match to a GM pressure bottle/reservoir to work in the same fashion as the Camaro and is to be the highest point in the cooling system.

Additional information

Weight 60 lbs
Dimensions 8 × 36 × 36 in

1 review for NA & NB LFX Cooling Kit

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Q & A

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When will this NB cooling kit be available? Doan Vu asked on November 15, 2024

Hi Doan - I’m pleased to inform you that the NB Cooling System is currently available. Should you wish to place an order, you can conveniently do so through our website at your earliest convenience.

V8 Roadsters answered on March 18, 2025
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does this rad work is the rx8 as well Ron Molnar asked on July 9, 2024

Hi Ron - no, this only fits the earlier Miatas. The NC cooling system can be used in the RX8, we expect those back in stock mid August.

V8 Roadsters answered on July 9, 2024
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Is the current cooling kit any better then Kit I purchased in 2013 for my LS2 Miata. Wondering if my system would run any cooler with replacement Normal driving it is running between 190 and 220 degrees. Worried about the 210 to 220 degrees during 80 degree days. Dave Bunker asked on September 17, 2020

Hi Dave - sorry we missed your original question. This kit is for the LFX V6 conversion. Our LSx radiators use a similar core but with a single 1600cfm puller fan. The core was updated in 2015 and is more efficient than our older cores and the cores that were used by other vendors as well.

V8 Roadsters answered on October 15, 2020
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