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2015+ S550 Mustangs
Drivetrain Modification/Discussion
IRS vs Solid Axle weight comparison
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<blockquote data-quote="BlackBolt9" data-source="post: 14737271" data-attributes="member: 36489"><p>I'm not sure, I wasn't there when they took them apart. Just saw the aftermath and it looked like a bomb went off in the diff. From the parts and pieces I couldn't tell if it was gear or diff failure. I would bet it's a fatigue loading issue though because I'm pretty sure the couple we've had break were not on new parts.</p><p></p><p>This car we are building will originally be ran in Trans-Am and American Iron since the S550 hasn't been homologated into World Challenge yet. So we will have to run whatever restrictor is necessary to match the power to weight ratio required by the rules.</p><p></p><p>When the car does make it's way into World Challenge, I suspect it will get MORE restrictor. In theory, the S550 "should" handle better, so to keep parity amount other makes/models in the series, they will need to make less power. Keep in mind Dean is running the top of the leader board at COTA this weekend with the S197 so far.... we'll see when the other teams take out the sandbags though....</p><p></p><p></p><p></p><p>I was comparing these for mostly race cars, I don't know anybody that was running the 25mm bars. Most were around 18mm and some actually run without a bar at all. Doubtful you can get away with running no rear bar on the IRS. I figured I'd weigh the 25mm in case anyone was interested though, and because it was the first one I grabbed off the pile <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Not sure on the different styles of upper and lower control arms. I did notice the larger hardware on the newer upper arm but it can't amount to more than a pound or two. We didn't get that picky because that's in the noise of how much everything weighs.</p></blockquote><p></p>
[QUOTE="BlackBolt9, post: 14737271, member: 36489"] I'm not sure, I wasn't there when they took them apart. Just saw the aftermath and it looked like a bomb went off in the diff. From the parts and pieces I couldn't tell if it was gear or diff failure. I would bet it's a fatigue loading issue though because I'm pretty sure the couple we've had break were not on new parts. This car we are building will originally be ran in Trans-Am and American Iron since the S550 hasn't been homologated into World Challenge yet. So we will have to run whatever restrictor is necessary to match the power to weight ratio required by the rules. When the car does make it's way into World Challenge, I suspect it will get MORE restrictor. In theory, the S550 "should" handle better, so to keep parity amount other makes/models in the series, they will need to make less power. Keep in mind Dean is running the top of the leader board at COTA this weekend with the S197 so far.... we'll see when the other teams take out the sandbags though.... I was comparing these for mostly race cars, I don't know anybody that was running the 25mm bars. Most were around 18mm and some actually run without a bar at all. Doubtful you can get away with running no rear bar on the IRS. I figured I'd weigh the 25mm in case anyone was interested though, and because it was the first one I grabbed off the pile :) Not sure on the different styles of upper and lower control arms. I did notice the larger hardware on the newer upper arm but it can't amount to more than a pound or two. We didn't get that picky because that's in the noise of how much everything weighs. [/QUOTE]
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IRS vs Solid Axle weight comparison
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