This has been a very long time in the making, but after a supplier switch and several prototypes later we finally have a finished product we are extremely happy with.
Trackspeed Engineering Triple-Pass Dual-Row 76mm Radiator – $449
We are now taking pre-orders for these units. Don’t delay – these will be an in-stock item but pre-order customers will be the first units shipped out when they arrive. We do expect to sell the first batch of units very quickly. Send an email to info “at” trackspeed engineering “dot” com with the subject “Radiator Preorder” and we will send an invoice out. See below for tech information and empirical results.
This radiator has been designed and tested to keep Miatas cool, regardless of the application. Whether it's a Spec Miata in a draft or a monster-power turbo car with a monster-sized intercooler blocking radiator flow, this radiator has been tested and proven to maintain safe cooling temps in all conditions.
Designed in-house, our unit differs from many current off-the-shelf radiators in two major ways. First, it is a cross-flow unit. Instead of a top/bottom endtank design, the coolant is cycled through the radiator from side to side. Second, it is a dual-core radiator, using a pair of smaller cores over a single larger core. The result is a radiator that offers significant cooling improvements with little or no added weight. Don’t let looks deceive you – our massive 76mm unit weighs approximately the same as a Koyo 55mm unit when filled with water (~21lbs).
The benefits don’t stop with the construction – a year of testing and R&D have allowed us to tweak and fine-tune this radiator in several different ways. In order to gather more air, our unit is taller than the factory unit, bringing the bottom of the radiator closer to the OEM undertray. Airflow management is hugely important in a fast track Miata, and we have not ignored this fact in our design process. Our radiators also come equipped with a 16psi cap and a standard oversized filler neck to make filling easier. The radiator drops into place just as the factory unit does, re-using OEM mounts from your factory radiator on the top and bottom. Large front sway bars provide no issue – an OEM fan with a trimmed shroud or low-profile aftermarket fans will fit on the radiator, even if your car is equipped with a large swaybar. A single OEM fan will locate correctly to allow OEM intake fitment for Spec Miatas. The radiator is compatible with the factory A/C condenser and lines, allowing fast track cars to travel to and from the track in comfort without putting their motors at risk. (The A/C cooling fan is deleted in order to ensure proper fitment of the primary fan.)
Using this radiator, our shop Spec Miata, a 1.6 car, showed coolant temps of approximately 170*F (160*F thermostat) – in 100*F ambient conditions.
On a weekend where numerous Koyo 55mm-equipped cars were cutting sessions short due to overheating, and at least one car suffered a motor failure attributed to high coolant temps, we were able to keep the car cool enough to maintain maximum power even after long sessions. It’s a well-known fact that Spec Miatas make more power with lower coolant temps, so for tight-draft running a monster radiator is a must-have item.
My own 350whp/300wtq turbo machine spent the summer running 20-25 minute long stints at full power, with coolant temps never venturing beyond 210*F – a single cooldown lap would bring those temps down to approximately ~175*F. High ambient temperatures always meant truncated sessions with my old 2” CSF core, but regardless of air or track temperatures the car stays cool and safe, thanks to our massively efficient unit.
As with all Trackspeed Engineering products, this is a product that we use and abuse in our own shop cars, and we are proud to offer the same products to fellow enthusiasts.