{"id":805852,"date":"2026-10-14T10:36:51","date_gmt":"2026-10-14T10:36:51","guid":{"rendered":"https:\/\/tunerscapital.si\/product\/forge-motorsport-nastavljivi-aktuator-turbopolnilnika-za-seat-leon-i-vw-polo-iv-1-8t\/"},"modified":"2026-10-18T03:10:44","modified_gmt":"2026-10-18T03:10:44","slug":"forge-motorsport-nastavljivi-aktuator-turbopolnilnika-za-seat-leon-i-vw-polo-iv-1-8t","status":"publish","type":"product","link":"https:\/\/tunerscapital.eu\/en\/product\/forge-motorsport-nastavljivi-aktuator-turbopolnilnika-za-seat-leon-i-vw-polo-iv-1-8t\/","title":{"rendered":"Forge Motorsport adjustable turbocharger actuator for Seat Leon I\/VW Polo IV 1.8T"},"content":{"rendered":"<p>This actuator is designed for 1.8T engines in Volkswagen Golf and Polo vehicles with a transversely mounted engine.<\/p>\n<p>Forge Motorsport was one of the first companies in the world to develop and manufacture a two-piece replacement aluminium turbocharger actuator made from forged aluminium. It was initially developed for Cosworth, Renault 5 GT Turbo and Lancia Integrale turbochargers, followed by an extensive range of replacement actuators.<\/p>\n<ul>\n<li>Spring pressure selection according to the vehicle<\/li>\n<li>Manufactured from 6026-grade aluminium<\/li>\n<li>Vehicle-specific design<\/li>\n<li>Turbocharger-specific design<\/li>\n<li>Machined and hand-polished in the United Kingdom<\/li>\n<li>Diaphragm or piston sealing is available for most actuators<\/li>\n<li>Fluorosilicone diaphragms reinforced with Nomex material<\/li>\n<li>Laser-cut stainless steel brackets where required<\/li>\n<li>Made in England<\/li>\n<\/ul>\n<p><strong>Important:<\/strong><\/p>\n<p>The spring pressure values are stated as minimum regulated pressures.<\/p>\n<p>The Forge actuator enables precise adjustment and control of the required boost pressure, which can improve response and control. A spring with a predetermined rate, suitable for factory boost pressure or slightly higher values, is fitted as standard. For vehicles with modifications, a stiffer spring can be used when higher boost pressure is required.<\/p>\n<p>The actuator is designed to increase the turbocharger system\u2019s output boost pressure. Compatibility and the actual achievable boost pressure depend on the limitations of the engine management system, regardless of whether it is a factory or upgraded system.<\/p>\n<p>The standard version uses diaphragm sealing for the internal parts, while piston sealing is also available. The piston version provides comparable performance and requires less maintenance thanks to the more durable seal construction.<\/p>\n<p><strong>The kit includes:<\/strong><br \/>\n1 \u00d7 FMACVAG03\/G actuator<br \/>\n1 \u00d7 Forge sticker<\/p>\n<p>The actuator is fitted with the standard spring as supplied. If you require the FMPACTUN spring adjustment kit, select the Diaphragm Type 2, 049 option.<\/p>\n<p>All actuator rods are made from 303-grade stainless steel.<\/p>\n<p>The stated spring pressures according to the colour markings apply only to the mechanical part of the system and primarily concern older turbocharged engines where pressure is not regulated through the ECU or solenoid.<\/p>\n<p>In modern engines with regulation through the ECU or solenoid, the target boost pressure is not necessarily the same as the mechanical spring specification. When selecting a spring, consider the specific vehicle model and the planned level of modification.<\/p>\n<p>The same vehicle- and control-system-specific selection restrictions apply to the T2 spring range (FMAS049).<\/p>\n<p><strong>Suitable for:<\/strong> SEAT Leon I (1M1), VW Golf IV (1J), VW Polo IV (9N).<\/p>\n<h3>Compatible vehicles (manufacturer data)<\/h3>\n<table class=\"tc-fitment-table\">\n<thead>\n<tr>\n<th>Vehicle<\/th>\n<th>Chassis<\/th>\n<th>Years<\/th>\n<th>Engine<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Seat Leon<\/td>\n<td>MK1<\/td>\n<td>1998\u20132005<\/td>\n<td>Cupra 1.8T<\/td>\n<\/tr>\n<tr>\n<td>Volkswagen Polo<\/td>\n<td>MK4<\/td>\n<td>2002\u20132009<\/td>\n<td>GTI 1.8T<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Before ordering, check that the product matches your vehicle (model, year and engine). If in doubt, write to us \u2014 we will check for you.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Forge Motorsport adjustable turbocharger actuator for transversely mounted 1.8T engines enables more precise boost pressure control.<\/p>\n<p><strong>Fits:<\/strong> Seat Leon I (1M1) 1.8T and Volkswagen Polo IV (9N) GTI 1.8T<\/p>\n","protected":false},"featured_media":805863,"comment_status":"open","ping_status":"closed","template":"","meta":{"ep_exclude_from_search":false},"product_brand":[144680],"product_cat":[2061],"product_tag":[],"class_list":["post-805852","product","type-product","status-publish","has-post-thumbnail","tc_lang-en","tc_lang-hr","product_brand-forge-motorsport","product_cat-turbo-polnilniki-in-dodatna-oprema","product_shipping_class-dostava-teza-do-5kg","pa_proizvajalec-forge-motorsport","first","onbackorder","taxable","shipping-taxable","purchasable","product-type-variable"],"_links":{"self":[{"href":"https:\/\/tunerscapital.eu\/en\/wp-json\/wp\/v2\/product\/805852","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tunerscapital.eu\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/tunerscapital.eu\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/tunerscapital.eu\/en\/wp-json\/wp\/v2\/comments?post=805852"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tunerscapital.eu\/en\/wp-json\/wp\/v2\/media\/805863"}],"wp:attachment":[{"href":"https:\/\/tunerscapital.eu\/en\/wp-json\/wp\/v2\/media?parent=805852"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/tunerscapital.eu\/en\/wp-json\/wp\/v2\/product_brand?post=805852"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/tunerscapital.eu\/en\/wp-json\/wp\/v2\/product_cat?post=805852"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/tunerscapital.eu\/en\/wp-json\/wp\/v2\/product_tag?post=805852"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}