{"product_id":"speed-density-custom-feature-vb-wrx","title":"Speed Density Custom Feature - VA\/VB WRX","description":"\u003cp\u003e\u003cstrong\u003eNAMR custom feature, available through GropeTuned, an official Atlas commercial tuner.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eNAMR feature description\u003c\/h2\u003e\n\u003cp\u003eSpeed density fundamentally changes the way your ECU measures air by applying the \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Ideal_gas_law\"\u003eideal gas law\u003c\/a\u003e to your intake manifold’s environment via TMAP sensor readings.\u003c\/p\u003e\n\u003cp\u003eThis custom feature removes dependency on your MAF sensor and instead permits you to directly calibrate your airflow using the two Airflow - VE - Volumetric Efficiency tables. As such, \u003cstrong\u003etuning speed density is different\u003c\/strong\u003e than MAF.\u003c\/p\u003e\n\u003cp\u003eSpeed density tunes feel “smoother”, have more precisely dialed fuel trims, and can be more tolerant of modifications or leaks in the intake side of your engine (such as blowoff valves).\u003c\/p\u003e\u003ch2\u003eFeature requirements\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupported chassis:\u003c\/strong\u003e 2015–2021 WRX VA and 2022+ WRX VB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersion:\u003c\/strong\u003e 1.3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReleased:\u003c\/strong\u003e 8\/23\/2026\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequires:\u003c\/strong\u003e Atlas 2026.1+\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDigital software feature by NAMR. Custom calibration and any required hardware are sold separately.\u003c\/p\u003e\u003cp\u003eThis software feature is $0. GropeTuned’s \u003ca href=\"\/products\/speed-density-tune-add-on\"\u003eSpeed Density Tune Add-On — $100\u003c\/a\u003e covers the separate calibration work.\u003c\/p\u003e\u003ch2\u003eDelivery and purchase terms\u003c\/h2\u003e\u003cp\u003eGropeTuned will manually email the free feature files after processing your order. Delivery is by email, not an instant automated download. Use an email address you can access at checkout.\u003c\/p\u003e","brand":"NAMR","offers":[{"title":"Default Title","offer_id":50647281139851,"sku":"NAMR-CF-SD-VB","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0727\/6737\/3451\/files\/atlas-speed-density-custom-feature-vb-wrx.webp?v=1791912567","url":"https:\/\/gropetuned.myshopify.com\/products\/speed-density-custom-feature-vb-wrx","provider":"GropeTuned","version":"1.0","type":"link"}