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Originally Posted by ju-on
Does the Greddy core have internal turbulators?
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Depends on the core.
The Greddy V-Spec core has very little inside it. The call it a "max flow" design with "Micro Groove Tube". It looks like an extruded tube design inside, but with even less than usual going on inside. They recommend that core for low-medium boost on factory turbo engine or for orginally NA cars with a basic bolt-on turbo kit.
The Greddy R-Spec core has inner turbulator fins to dissipate heat. They call it their "max cooling" design and recommend it for medium-high boost levels and for higher horsepower engines.
Just watch out for intercooler cores where all they hype is how little their core has for pressure drop. A straight pipe had little pressure drop also, but it doesn't cool much.
There are so many different eBay/SS autochrome style intercoolers out there now with all of the different places in China making them for dirt cheap. They probably work fine at low boost, but they sometimes have leaks at higher boost and some have been tested to be absolute crap at high boost levels. Who knows if some are good while others are bad though. I am not a fan of the easy to see through cores though. Some are just square boxes, with no turbultors or extrude turbing inside. I don't really like extruded turbe intercooler either though, Spearco sold them for a year or so about 4 years ago for a less expensive line of cores, but dumped them because they didn't perform nearly as well as their bar-and-plate design.