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SVT Shelby GT500
Only getting 10 psi with VMP 2.5 pulley and 90mm idler...any ideas why?
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<blockquote data-quote="VNMOUS1" data-source="post: 14079751" data-attributes="member: 36794"><p>Jay, this has been debated, cussed and discussed ad nauseum. Your post began with pointed language that benefits no one. </p><p></p><p>Everything I said in my post is correct;</p><p></p><p>1. Factory boost is inferred.</p><p>2. The MAF is a critical component of that inferred sum (there are others as well)</p><p>3. Regardless of who makes that shift in the curve it will have an effect on the inferred boost. ("It makes no difference who...")</p><p>4. That doesn't mean it's done correctly or incorrectly. It's simply shifted and it changes the inferred data. May be wrong, may be correct. Depends on who tuned it.</p><p></p><p></p><p>The OEM method of arriving at a mass air transfer function and the aftermarket method differ 180*. There is no right nor wrong, just different. </p><p></p><p>In a perfect world, every aftermarket manufacturer would have the luxury (and resources) for lab time, take those numbers and enter them into the transfer function. I don't know if that's the case with all the cars you tune but it is overwhelmingly not the case within the industry and <strong><em>why even OEM calibrators use adjustment of the xfer function as a tool in aftermarket applications.</em></strong> (reference <a href="http://www.calibratedsuccess.com/Basic.htm" target="_blank">http://www.calibratedsuccess.com/Basic.htm</a>)</p><p></p><p>If the mega-dollar OEM method was the ONLY safe, effective method there would be a lot of calibrators, tuning software companies and much of the aftermarket out of business. Fortunately, that's not the case. </p><p></p><p>Your last paragraph is helpful to the group and, not that it matters, but I agree wholeheartedly. </p><p></p><p>Regards-</p><p></p><p>bj</p></blockquote><p></p>
[QUOTE="VNMOUS1, post: 14079751, member: 36794"] Jay, this has been debated, cussed and discussed ad nauseum. Your post began with pointed language that benefits no one. Everything I said in my post is correct; 1. Factory boost is inferred. 2. The MAF is a critical component of that inferred sum (there are others as well) 3. Regardless of who makes that shift in the curve it will have an effect on the inferred boost. ("It makes no difference who...") 4. That doesn't mean it's done correctly or incorrectly. It's simply shifted and it changes the inferred data. May be wrong, may be correct. Depends on who tuned it. The OEM method of arriving at a mass air transfer function and the aftermarket method differ 180*. There is no right nor wrong, just different. In a perfect world, every aftermarket manufacturer would have the luxury (and resources) for lab time, take those numbers and enter them into the transfer function. I don't know if that's the case with all the cars you tune but it is overwhelmingly not the case within the industry and [B][I]why even OEM calibrators use adjustment of the xfer function as a tool in aftermarket applications.[/I][/B] (reference [url]http://www.calibratedsuccess.com/Basic.htm[/url]) If the mega-dollar OEM method was the ONLY safe, effective method there would be a lot of calibrators, tuning software companies and much of the aftermarket out of business. Fortunately, that's not the case. Your last paragraph is helpful to the group and, not that it matters, but I agree wholeheartedly. Regards- bj [/QUOTE]
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SVT Shelby GT500
Only getting 10 psi with VMP 2.5 pulley and 90mm idler...any ideas why?
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