PeterV
02-08-2007, 10:30 AM
A bit of advice in our April 2007 issue's "Engine Tuning Guide" feature caught Traxxas' eye. For those readers who can't even get their engine started or running long enough to do any tuning, the article suggests setting the carb's high-end needle to the "stock setting," or 2.5 turns out as a default setting if you don't have a manual. Although the article is not specifically about Traxxas engine tuning, Traxxas is concerned by our advice because they recommend 4 turns out as a default setting for TRX engines (the engines so many of you have!). Naturally, we suggest you follow Traxxas specific advice over our "for most engines" advice, if you have a TRX engine. Here's Traxxas' official word:
Attention Car Action readers! Carb Tuning News. We found an error in the Engine Tuning Guide of the April issue (page 154) of Radio Control Car Action. While the article states that the default settings for ‘most cars’ is 2 ½ turns, for the Traxxas carbs on TRX 2.5, 2.5R and 3.3 racing engines, 4 turns is our default factory setting. Traxxas carburetors are preset at the factory using precise methods. If the factory settings for the high-speed needle are lost, then Traxxas recommends setting the high-speed needle to 4 turns out (counterclockwise) from closed. Always tune the engine starting from a rich setting and gradually move towards a leaner setting. In most cases, a high-speed needle setting of 2 ½ turns out as specified by the RC Car Action tuning article (April 2007, p 156) will be overly lean and will cause tuning difficulty, drivability problems, and engine damage. For more information about correctly setting the fuel mixture for Traxxas engines, refer to your Traxxas Owners Manual or get precise Factory Tuning settings with the Traxxas Knowledge Center article found at this link: http://www.traxxas.com/support/index.php?action=artikel&cat=88&id=450. You may also contact Traxxas directly at 1-888-Traxxas.
Attention Car Action readers! Carb Tuning News. We found an error in the Engine Tuning Guide of the April issue (page 154) of Radio Control Car Action. While the article states that the default settings for ‘most cars’ is 2 ½ turns, for the Traxxas carbs on TRX 2.5, 2.5R and 3.3 racing engines, 4 turns is our default factory setting. Traxxas carburetors are preset at the factory using precise methods. If the factory settings for the high-speed needle are lost, then Traxxas recommends setting the high-speed needle to 4 turns out (counterclockwise) from closed. Always tune the engine starting from a rich setting and gradually move towards a leaner setting. In most cases, a high-speed needle setting of 2 ½ turns out as specified by the RC Car Action tuning article (April 2007, p 156) will be overly lean and will cause tuning difficulty, drivability problems, and engine damage. For more information about correctly setting the fuel mixture for Traxxas engines, refer to your Traxxas Owners Manual or get precise Factory Tuning settings with the Traxxas Knowledge Center article found at this link: http://www.traxxas.com/support/index.php?action=artikel&cat=88&id=450. You may also contact Traxxas directly at 1-888-Traxxas.