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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford SVT Raptor General Discussions [GEN 1]
Supercharger or not?
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<blockquote data-quote="BoostedToy" data-source="post: 1536093" data-attributes="member: 31712"><p>Exactly. The 1-2 shift harshness would cause at minimum, the belt to jump, at most, the tensioner to break. I have some pictures Of the carnage I will locate and share.</p><p></p><p>JDM quickly told me that they had seen that before, and it was pretty much specific to the 13’s. The 14’s ended up using a slightly different serpentine routing, removing a large ribbed-idler pulley from the 13 setup, and added a FEAD belt guard.</p><p></p><p>JDM (and later VMP) attributed it to the harshness of the tune on the 1-2 shift in high traction and load situations, which was most pronounced on the 1-2 with the torque multiplication at that shift. The second issue was with the serp configuration on the 13 setup. I believe it was JDM who identified what they referred to as a extremely violent ratcheting effect on the tensioner arm on this 1-2 shift when in 4wd with high traction available. The a small (in actual size) wave would travel throughout the serp belt when the ratcheting would occur. Eventually, the wave would end when the belt would make contact with itself, lock the belt from moving which would then either jump the belt or even some cases, which I personally experienced, shear the tensioner arm.</p><p></p><p></p><p>I went from a near 1:1 ratio of 4wd HI WOT 1-2 shifts to destruction, to maybe ~20 of those types of scenarios since with no issues.</p></blockquote><p></p>
[QUOTE="BoostedToy, post: 1536093, member: 31712"] Exactly. The 1-2 shift harshness would cause at minimum, the belt to jump, at most, the tensioner to break. I have some pictures Of the carnage I will locate and share. JDM quickly told me that they had seen that before, and it was pretty much specific to the 13’s. The 14’s ended up using a slightly different serpentine routing, removing a large ribbed-idler pulley from the 13 setup, and added a FEAD belt guard. JDM (and later VMP) attributed it to the harshness of the tune on the 1-2 shift in high traction and load situations, which was most pronounced on the 1-2 with the torque multiplication at that shift. The second issue was with the serp configuration on the 13 setup. I believe it was JDM who identified what they referred to as a extremely violent ratcheting effect on the tensioner arm on this 1-2 shift when in 4wd with high traction available. The a small (in actual size) wave would travel throughout the serp belt when the ratcheting would occur. Eventually, the wave would end when the belt would make contact with itself, lock the belt from moving which would then either jump the belt or even some cases, which I personally experienced, shear the tensioner arm. I went from a near 1:1 ratio of 4wd HI WOT 1-2 shifts to destruction, to maybe ~20 of those types of scenarios since with no issues. [/QUOTE]
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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford SVT Raptor General Discussions [GEN 1]
Supercharger or not?
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