{"id":55583,"date":"2026-11-06T07:40:15","date_gmt":"2026-11-06T06:40:15","guid":{"rendered":"https:\/\/www.italpassion.fr\/?p=55583"},"modified":"2026-10-29T11:00:33","modified_gmt":"2026-10-29T10:00:33","slug":"questo-preparatore-scopre-cosa-limita-la-potenza-del-motore-20-l-a-4-cilindri-dellalfa-romeo-che-dovrebbe-erogare-412-ch-invece-di-280-ch","status":"publish","type":"post","link":"https:\/\/www.italpassion.fr\/it\/alfa-romeo\/ce-preparateur-decouvre-ce-qui-bride-le-moteur-2-0l-4-cylindres-de-lalfa-romeo-412-ch-au-lieu-de-280-ch\/","title":{"rendered":"Questo preparatore scopre cosa limita la potenza del motore 2.0L a 4 cilindri dell\u2019Alfa Romeo\u2026 412 CV invece di 280 CV"},"content":{"rendered":"<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"800\" src=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance-0.jpg\" alt=\"\" class=\"wp-image-55591\" srcset=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance-0.jpg 1200w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance-0-420x280.jpg 420w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance-0-18x12.jpg 18w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance-0-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Fino a che punto si pu\u00f2 spingere il motore turbo da 2,0 litri dell\u2019<a href=\"https:\/\/www.italpassion.fr\/it\/auto\/alfa-romeo-giulia\/\">Alfa Romeo Giulia<\/a> ? Mentre la versione Veloce eroga di serie 280 ch, alcuni preparatori sono ben determinati a dimostrare che questo quattro cilindri italiano ha ancora un buon margine di miglioramento. Nei Paesi Bassi, JTD-Performance ha appena compiuto un nuovo passo avanti annunciando 412 CV. E la cosa pi\u00f9 interessante \u00e8 il modo in cui \u00e8 stata ottenuta questa potenza.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Da 280 a 365 CV: una prima messa a punto gi\u00e0 impressionante<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tutto inizia con un\u2019Alfa Romeo Giulia Veloce 2.0 turbo di serie. Il preparatore olandese JTD-Performance procede innanzitutto a una riprogrammazione elettronica realizzata con Squadra Tuning. Risultato: circa 310 CV e 470 Nm di coppia. Una messa a punto relativamente nota ai proprietari.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ma il team non intende fermarsi qui. Installa quindi un turbo ibrido 2263, uno scambiatore di calore supplementare per migliorare il raffreddamento, un downpipe con catalizzatore a 200 celle e un impianto di scarico Ragazzon con silenziatore posteriore a valvole. Una nuova mappatura del motore e del cambio permette cos\u00ec di raggiungere circa 365 CV e 490 Nm. Una potenza gi\u00e0 notevole per questo quattro cilindri, ma JTD-Performance vuole spingersi oltre. Il problema \u00e8 che, come molti altri preparatori, l\u2019azienda si scontra con un limite massimo compreso tra i 360 e i 370 CV.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"800\" src=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-giulia.jpg\" alt=\"\" class=\"wp-image-55587\" srcset=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-giulia.jpg 1200w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-giulia-420x280.jpg 420w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-giulia-18x12.jpg 18w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-giulia-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Il segreto dei 412 CV si nascondeva nel turbo<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Per capire cosa limita la potenza, JTD-Performance equipaggia la sua Giulia con diversi sensori e strumenti di misura forniti dallo specialista americano Banks Power. Queste apparecchiature consentono in particolare di analizzare le temperature e le pressioni dei gas di scarico, al fine di identificare gli elementi che limitano le prestazioni del motore, oltre a un sistema di acquisizione dati di Squadra Tuning.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"580\" src=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-4.jpg\" alt=\"\" class=\"wp-image-55589\" srcset=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-4.jpg 1200w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-4-420x203.jpg 420w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-4-768x371.jpg 768w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-4-18x9.jpg 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">I risultati evidenziano un problema di contropressione nello scarico. Il turbo ibrido a doppia voluta (<em>twin-scroll<\/em>) genera una pressione eccessiva a monte della turbina, il che compromette le prestazioni del motore agli alti regimi. Il preparatore decide quindi di sostituire completamente il turbo con un modello pi\u00f9 grande, a singola voluta (<em>mono-scroll<\/em>).<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"881\" src=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-3.jpg\" alt=\"\" class=\"wp-image-55588\" srcset=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-3.jpg 1200w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-3-420x308.jpg 420w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-3-767x563.jpg 767w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-3-16x12.jpg 16w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption class=\"wp-element-caption\">JTD-Performance ha tagliato il carter del vecchio turbo ibrido per mettere in evidenza la parete interna che riduce la sezione di passaggio dei gas di scarico verso la turbina. Una restrizione che contribuiva a limitare la potenza del motore 2.0L dell\u2019Alfa Romeo Giulia.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"876\" height=\"1200\" src=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-mono-vs-twin-876x1200-1.jpg\" alt=\"\" class=\"wp-image-55586\" srcset=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-mono-vs-twin-scaled-1.jpg 876w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-mono-vs-twin-307x420-1.jpg 307w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-mono-vs-twin-9x12-1.jpg 9w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-mono-vs-twin-768x1052-1.jpg 768w\" sizes=\"auto, (max-width: 876px) 100vw, 876px\" \/><figcaption class=\"wp-element-caption\">In alto, il nuovo turbo mono-scroll con la sua entrata libera. In basso, il vecchio turbo ibrido twin-scroll, la cui parete divisoria centrale riduce la sezione di passaggio dei gas di scarico. Una differenza che contribuisce a spiegare l\u2019aumento di potenza ottenuto da JTD-Performance.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"693\" src=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-2.jpg\" alt=\"\" class=\"wp-image-55585\" srcset=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-2.jpg 1200w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-2-420x243.jpg 420w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-2-767x443.jpg 767w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-2-18x10.jpg 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption class=\"wp-element-caption\">Turbo <em>twin-scroll<\/em> vs Turbo mono-scroll<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">E i risultati sono immediati! Senza nemmeno modificare la mappatura del motore, la pressione all\u2019ingresso della turbina diminuisce di circa 0,5 bar e la potenza aumenta di circa quaranta cavalli. Le misurazioni evidenziano inoltre un miglioramento di 13,6 punti percentuali del rapporto di spurgo dei cilindri, consentendo al motore di espellere meglio i gas di scarico. <strong>Risultato: 412 CV, ovvero 132 CV in pi\u00f9 rispetto alla Giulia Veloce di serie!<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"662\" src=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo.jpg\" alt=\"\" class=\"wp-image-55584\" srcset=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo.jpg 1200w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-420x232.jpg 420w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-18x10.jpg 18w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/turbo-767x423.jpg 767w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Una Giulia che arriva fino a 6.600 giri\/min<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Questa nuova configurazione modifica anche il carattere del motore. La coppia arriva ora circa 500 giri\/min pi\u00f9 tardi, ma, a differenza della precedente messa a punto, la potenza non cala pi\u00f9 agli alti regimi. Continua infatti a crescere fino a raggiungere i 412 CV a circa 6.300 giri\/min e rimane superiore ai 400 CV fino a 6.600 giri\/min, regime al quale \u00e8 stato impostato il limitatore. Pochi giorni prima di svelare questi risultati, JTD-Performance aveva inoltre pubblicato un impressionante video di accelerazione della sua Giulia, in particolare fino a 200 km\/h.<\/p>\n\n\n\n<iframe loading=\"lazy\" src=\"https:\/\/www.facebook.com\/plugins\/video.php?height=315&#038;href=https%3A%2F%2Fwww.facebook.com%2Freel%2F1122595093969862%2F&#038;show_text=false&#038;width=560&#038;t=0\" width=\"560\" height=\"315\" style=\"border:none;overflow:hidden\" scrolling=\"no\" frameborder=\"0\" allowfullscreen=\"true\" allow=\"autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share\"><\/iframe>\n\n\n\n<h2 class=\"wp-block-heading\">E ora, obiettivo 420 CV!<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Non \u00e8 la prima Giulia a quattro cilindri a superare la soglia dei 400 CV. Avevamo infatti presentato una Giulia da competizione britannica <a href=\"https:\/\/www.italpassion.fr\/it\/alfa-romeo\/una-nuova-alfa-romeo-giulia-e-appena-entrata-in-gara-con-un-motore-a-4-cilindri-da-430-ch-e-un-look-da-gta\/\">con una potenza di 430 CV<\/a>, oltre a una <a href=\"https:\/\/www.italpassion.fr\/it\/alfa-romeo\/questo-americano-mette-un-grosso-turbo-nella-sua-alfa-romeo-giulia-e-perde-sullautostrada-tedesca-rivaleggiando-con-la-bmw-m340i-audi-s4-e-la-mercedes-amg-c43\/\">preparazione americana<\/a> dotata di un potente turbo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ma il lavoro di JTD-Performance \u00e8 particolarmente interessante per il suo approccio tecnico e per i numerosi dati condivisi. E la storia non \u00e8 finita qui. Il preparatore ritiene che alcuni elementi possano ancora essere ottimizzati e punta ora a <strong>420 CV<\/strong>. Questo avvicina ancora un po\u2019 questa Giulia Veloce alle prestazioni della sua sorella maggiore Quadrifoglio, che vanta 510 CV con il suo V6 biturbo!<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"771\" src=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance.jpg\" alt=\"\" class=\"wp-image-55590\" srcset=\"https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance.jpg 1200w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance-420x270.jpg 420w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance-18x12.jpg 18w, https:\/\/www.italpassion.fr\/wp-content\/uploads\/2026\/10\/jtd-performance-767x493.jpg 767w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":55591,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[22],"tags":[288],"class_list":["post-55583","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-alfa-romeo","tag-alfa-romeo-giulia","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ce pr\u00e9parateur d\u00e9couvre ce qui bride le moteur 2.0L 4 cylindres de l\u2019Alfa Romeo... 412 ch au lieu de 280 ch - ItalPassion<\/title>\n<meta name=\"description\" content=\"Jusqu&#039;o\u00f9 peut-on pousser le moteur 2.0L turbo de l&#039;Alfa Romeo Giulia ? Alors que la version Veloce d\u00e9veloppe 280 ch d&#039;origine, certains pr\u00e9parateurs sont\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.italpassion.fr\/it\/alfa-romeo\/questo-preparatore-scopre-cosa-limita-la-potenza-del-motore-20-l-a-4-cilindri-dellalfa-romeo-che-dovrebbe-erogare-412-ch-invece-di-280-ch\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ce pr\u00e9parateur d\u00e9couvre ce qui bride le moteur 2.0L 4 cylindres de l\u2019Alfa Romeo... 412 ch au lieu de 280 ch - ItalPassion\" \/>\n<meta property=\"og:description\" content=\"Jusqu&#039;o\u00f9 peut-on pousser le moteur 2.0L turbo de l&#039;Alfa Romeo Giulia ? 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