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Cobra Forums
2015+ Shelby GT350 Mustang
4.09 or 4.11
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<blockquote data-quote="ANGREY" data-source="post: 16131296" data-attributes="member: 188865"><p>1) I'm running R spec tire size so the height is approximately 26.7". </p><p>2) Driving this car at 70 mph is painful. If you drive 70 mph on most interstates, you either get dirty looks for driving in the fast lane and holding everyone up or you have to fight it out with all the slow drivers to the right.</p><p>3) Cruising at around 80 mph is more "normal".</p><p></p><p>So, at 80 mph with R spec tires, a 4.56 would wail at 2900 rpms. The same speed with the 27.3" regular tires is still 2820 rpms.</p><p></p><p>That same speed with 4.09s (R tires) is still a hefty 2600.</p><p></p><p>Again, I have ARH full exhaust, which is comfortable and quiet at anything lower than 2500 rpms, but beyond that it starts to sing and it escalates into a scream North of 3000 rpms.</p><p></p><p>It's a pick your poison affair. I wanted to wake the car up a little and get as much gear improvement I could without totally making the car miserable at cruising speeds. If 4.30 or even 4.56 blows your hair back, then knock it out.</p><p></p><p>We haven't even begun to examine the shift points and number of shifts to get to certain speeds. Assuming the car will trap in the low to mid 120's (with 4.09s) from a standing start, adding more gear won't make it faster, in fact it'll make it slower as you end up bouncing off the rev limiter or an extra shift.</p><p></p><p>There's a happy medium with biggest gear you can run without totally degrading the car into a strip/race only annoying car. Again, a .50 overdrive and my thought process might change.</p></blockquote><p></p>
[QUOTE="ANGREY, post: 16131296, member: 188865"] 1) I'm running R spec tire size so the height is approximately 26.7". 2) Driving this car at 70 mph is painful. If you drive 70 mph on most interstates, you either get dirty looks for driving in the fast lane and holding everyone up or you have to fight it out with all the slow drivers to the right. 3) Cruising at around 80 mph is more "normal". So, at 80 mph with R spec tires, a 4.56 would wail at 2900 rpms. The same speed with the 27.3" regular tires is still 2820 rpms. That same speed with 4.09s (R tires) is still a hefty 2600. Again, I have ARH full exhaust, which is comfortable and quiet at anything lower than 2500 rpms, but beyond that it starts to sing and it escalates into a scream North of 3000 rpms. It's a pick your poison affair. I wanted to wake the car up a little and get as much gear improvement I could without totally making the car miserable at cruising speeds. If 4.30 or even 4.56 blows your hair back, then knock it out. We haven't even begun to examine the shift points and number of shifts to get to certain speeds. Assuming the car will trap in the low to mid 120's (with 4.09s) from a standing start, adding more gear won't make it faster, in fact it'll make it slower as you end up bouncing off the rev limiter or an extra shift. There's a happy medium with biggest gear you can run without totally degrading the car into a strip/race only annoying car. Again, a .50 overdrive and my thought process might change. [/QUOTE]
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2015+ Shelby GT350 Mustang
4.09 or 4.11
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