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2013-14 Shelby GT500
Summer performance?
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<blockquote data-quote="Smackiavelli" data-source="post: 13316253" data-attributes="member: 136903"><p>I briefly considered taking it to the dealer, but I know from having owned numerous high HP cars that, generally, their M.O. is to suffer a palpable power decline in excessive heat (as others have also noted). The key, though, is not really the heat. It's the relative saturation of the lower atmosphere (a.k.a., humidity). By itself, a 100+ degree temperature--while having an adverse effect--is not typically enough to inspire that 'driving through molasses' feel. When, however, you have, say, a 73 degree dewpoint coupled with 100+ degree temperatures, the heat index elevates by a marked percentage (the exact number depends on a variety of factors, not the least of which being the depth of the moisture at the surface). With all the rain we've had, evapotranspirative influences play a role as well. For instance, I've seen ambient dewpoints this summer in the low seventies raised locally by evapotranspiration to mid and high 70s. That kind of airmass is intolerable for human or vehicle.</p><p></p><p>So, it's not just about heat. It's the quality of the air the engine is breathing. For our purposes, hot, dry air would be considered higher quality than hot, saturated air. I'd take inlet temperatures of 150 in an airmass characterized by 50 degree dewpoints any day over 95 degree inlet temps with a 73 degree dewpoint. </p><p></p><p>I see you live in Salt Lake City. While you guys don't completely escape humidity, your climate is predominantly subhumid. If I'm not mistaken, your deepest surface moisture typically occurs during the spring. Conversely, your summers are characterized by high heat but low RH (I just looked at a surface map for SLC and the dewpoints seem to be in the high 40s to low 50s--pretty dry). I mention this, because I wonder how your Shelby would feel to you if you drove it in 105/75 degree air as opposed to 105/48 degree air. The former is close to what my Shelby has been breathing (or choking on, more accurately) all summer. There could still be an issue, of course, but my gut is that the motor just isn't responding well to gasping through an SAI. That's what the stock CAI becomes in a 105/75 airmass - a Sauna Air Intake.</p><p></p><p></p><p></p><p></p><p>Thanks, dude. Just trying to add a little suspense and color to talking weather and sluggish Shelbys.</p></blockquote><p></p>
[QUOTE="Smackiavelli, post: 13316253, member: 136903"] I briefly considered taking it to the dealer, but I know from having owned numerous high HP cars that, generally, their M.O. is to suffer a palpable power decline in excessive heat (as others have also noted). The key, though, is not really the heat. It's the relative saturation of the lower atmosphere (a.k.a., humidity). By itself, a 100+ degree temperature--while having an adverse effect--is not typically enough to inspire that 'driving through molasses' feel. When, however, you have, say, a 73 degree dewpoint coupled with 100+ degree temperatures, the heat index elevates by a marked percentage (the exact number depends on a variety of factors, not the least of which being the depth of the moisture at the surface). With all the rain we've had, evapotranspirative influences play a role as well. For instance, I've seen ambient dewpoints this summer in the low seventies raised locally by evapotranspiration to mid and high 70s. That kind of airmass is intolerable for human or vehicle. So, it's not just about heat. It's the quality of the air the engine is breathing. For our purposes, hot, dry air would be considered higher quality than hot, saturated air. I'd take inlet temperatures of 150 in an airmass characterized by 50 degree dewpoints any day over 95 degree inlet temps with a 73 degree dewpoint. I see you live in Salt Lake City. While you guys don't completely escape humidity, your climate is predominantly subhumid. If I'm not mistaken, your deepest surface moisture typically occurs during the spring. Conversely, your summers are characterized by high heat but low RH (I just looked at a surface map for SLC and the dewpoints seem to be in the high 40s to low 50s--pretty dry). I mention this, because I wonder how your Shelby would feel to you if you drove it in 105/75 degree air as opposed to 105/48 degree air. The former is close to what my Shelby has been breathing (or choking on, more accurately) all summer. There could still be an issue, of course, but my gut is that the motor just isn't responding well to gasping through an SAI. That's what the stock CAI becomes in a 105/75 airmass - a Sauna Air Intake. Thanks, dude. Just trying to add a little suspense and color to talking weather and sluggish Shelbys. [/QUOTE]
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Summer performance?
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