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Cobra Forums
2013-14 Shelby GT500
Wheel/Tire questions
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<blockquote data-quote="SteveWK" data-source="post: 16474316" data-attributes="member: 139323"><p>Skip the 3.73s and put 4.10s in. I had 3.73s which were a big improvement, but the 4.10s are perfect IMHO, plus lots of guys have had problems with 3.73s whining excessively while the 4.10s seem to be less of a problem if installed correctly. Another member on here made a spread sheet that you can enter your tire size and gear ratio into and it will calculate mph for each gear every 500 rpm. I've attached the file. It is an excel file but for some reason the xls extension is not allowed for upload. I changed it to pdf and you will need to change it back to xls to open it. Also when you change gears you will need to reflash the ECU so that you speedometer is correct. Ford does not have the ability to reflash the ECU with anything other than the stock gear ratio, but you can do it yourself. I believe the SCT X4 will allow you to do this and still keep the stock tune. </p><p></p><p>You will want to replace the very soft and sloppy rear upper and lower control arms as well as the panhard bar with adjustable ones. BMR seems to be the most popular company for this mod. I can't comment on rims and tires sizes since I don't have much experience with them, but I do enjoy my Toyo R888s on the rear. I don't know if the convertible came with electronically adjustable shocks or not, but either way and since you want to go canyon driving, springs are another consideration too.</p><p></p><p>Get the suspension, gears, and tires sorted out and then you can add some power. Be careful with those Goodyears you currently have on the car, I have read stories of guys wrecking their cars because they did unexpected things.</p></blockquote><p></p>
[QUOTE="SteveWK, post: 16474316, member: 139323"] Skip the 3.73s and put 4.10s in. I had 3.73s which were a big improvement, but the 4.10s are perfect IMHO, plus lots of guys have had problems with 3.73s whining excessively while the 4.10s seem to be less of a problem if installed correctly. Another member on here made a spread sheet that you can enter your tire size and gear ratio into and it will calculate mph for each gear every 500 rpm. I've attached the file. It is an excel file but for some reason the xls extension is not allowed for upload. I changed it to pdf and you will need to change it back to xls to open it. Also when you change gears you will need to reflash the ECU so that you speedometer is correct. Ford does not have the ability to reflash the ECU with anything other than the stock gear ratio, but you can do it yourself. I believe the SCT X4 will allow you to do this and still keep the stock tune. You will want to replace the very soft and sloppy rear upper and lower control arms as well as the panhard bar with adjustable ones. BMR seems to be the most popular company for this mod. I can't comment on rims and tires sizes since I don't have much experience with them, but I do enjoy my Toyo R888s on the rear. I don't know if the convertible came with electronically adjustable shocks or not, but either way and since you want to go canyon driving, springs are another consideration too. Get the suspension, gears, and tires sorted out and then you can add some power. Be careful with those Goodyears you currently have on the car, I have read stories of guys wrecking their cars because they did unexpected things. [/QUOTE]
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Wheel/Tire questions
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