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The Terminator
Turbo Cobras
GTX35R - Opinions?
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<blockquote data-quote="Blown2004Stang" data-source="post: 10477882" data-attributes="member: 97068"><p>I'd use Precision's SC6176 and call it a day.. The T350 turbine wheel that precision uses actually outflows Garrett's GT series wheel in the 35R. Precision actually lost Garrett as a parts supplier, because the SC61 was outdoing the 35R, for a LOT less. Garrett told them to stop using the 35R compressor wheel in the SC61, and Precision told them to piss off. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> </p><p></p><p>Ball bearing isn't all it's cracked up to be.. trust me.. Spool up RPM is 95% dictated by turbine size, exhuast housing A/R, and total mass flow. Ball bearing CHRA's will help transient response (how fast the transition from no boost to full boost happens), but, that's about it. From my experience, the slightly slower transient response of the non-BB CHRA makes for better traction and control.. versus the BB CHRA's "light switch" boost onset.</p><p></p><p>In other words.. If you take 2 turbines, and put one in a BB housing, and the other in a non-BB housing, they will both spool at almost identical RPM on a given engine. The BB might have a 1-200 rpm advantage, but, that's about it. The BB turbo will reach full boost about 2-300 rpm faster than the non-BB turbo.. Not much to write home about.</p><p></p><p>Travis</p></blockquote><p></p>
[QUOTE="Blown2004Stang, post: 10477882, member: 97068"] I'd use Precision's SC6176 and call it a day.. The T350 turbine wheel that precision uses actually outflows Garrett's GT series wheel in the 35R. Precision actually lost Garrett as a parts supplier, because the SC61 was outdoing the 35R, for a LOT less. Garrett told them to stop using the 35R compressor wheel in the SC61, and Precision told them to piss off. ;) Ball bearing isn't all it's cracked up to be.. trust me.. Spool up RPM is 95% dictated by turbine size, exhuast housing A/R, and total mass flow. Ball bearing CHRA's will help transient response (how fast the transition from no boost to full boost happens), but, that's about it. From my experience, the slightly slower transient response of the non-BB CHRA makes for better traction and control.. versus the BB CHRA's "light switch" boost onset. In other words.. If you take 2 turbines, and put one in a BB housing, and the other in a non-BB housing, they will both spool at almost identical RPM on a given engine. The BB might have a 1-200 rpm advantage, but, that's about it. The BB turbo will reach full boost about 2-300 rpm faster than the non-BB turbo.. Not much to write home about. Travis [/QUOTE]
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