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The Terminator
Driveline
Soo happy!! 3.90's are on!
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<blockquote data-quote="Bob Cosby" data-source="post: 1752162" data-attributes="member: 2506"><p>I'm sure we would agree on most everything if we sat down and discussed this, and in reality, we do. However, there are still a few things I disagree with - and if we have to agree to disagree, that's ok with me.</p><p></p><p></p><p>That's neat, but it proves little. If anything, it just shows that people hadn't yet figured out the car.</p><p></p><p></p><p>"modulate all the torque" heavily implies traction limited. As I've said a few times before, my gearing recommendation depends on good traction. If you're running street tires or even DRs (depending upon many things), then you may indeed have trouble.</p><p></p><p></p><p>If you're traction limited due to not having some of the stuff above, then gears might not help. Otherwise, even cars with all our weight in front can be made to hook.</p><p></p><p>BTW...90/10s suck. <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></p><p>Agree that low-rpm power is much better with the 03/04, and that the 03/04 can make much better use of the 3.55s than the older cars would have. In other words, they are better matched to the powerband than a 99/01 Cobra. However, with traction, you would still accelerate faster if you can multiply that torque. This would be especially important off the line, as you spend ~12-15% of your ET in the first 4.5% of the 1/4 mile, meaning gains here (be it traction and/or improved acceleration through gearing) pay off big time at the other end.</p><p></p><p></p><p>Anybody spending $1000 on an IRS gear swap has issues. <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></p><p>Not sure I follow you here, but so long as you didn't over-gear the car, and so long as you were able to get traction, the car will accelerate with whatever gear maximizes average HP in each tranny gear through the 1/4. I think that's one of those "indisputables" we had above. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>BTW...I'd also like to again caveat that gear choice for automatics is quite different than what we are talking about here. </p><p></p><p></p><p>Disagree mostly. Just being heavy is misleading - you have to consider power-to-weight. Nose heavy only hurts if it prevents you from getting traction. Once you have traction, it is irrelevant.</p><p></p><p>I think it is due mostly to poor gearing, relatively modest driving (few people have pro-shifted trannies or really powershift their T56s with no regard to breakage), and traction-limited conditions.</p><p></p><p></p><p>Ya, it will all be done at once. Data would be nice, but I have a pretty fair idea of what works, and have my mods already planned out. Among other things, and as you alluded to, it makes no sense to through the live axle in without the gear, springs, shocks, and control arms of my choice.</p><p></p><p></p><p>Though I don't think you can say definatively that it wouldn't help ET, it certainly might not if you don't have traction.</p><p></p><p>I think I need to go count the amount of times I posted the word "traction" in this thread. <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>Hope you had a Merry Christmas.</p><p>Bob</p></blockquote><p></p>
[QUOTE="Bob Cosby, post: 1752162, member: 2506"] I'm sure we would agree on most everything if we sat down and discussed this, and in reality, we do. However, there are still a few things I disagree with - and if we have to agree to disagree, that's ok with me. That's neat, but it proves little. If anything, it just shows that people hadn't yet figured out the car. "modulate all the torque" heavily implies traction limited. As I've said a few times before, my gearing recommendation depends on good traction. If you're running street tires or even DRs (depending upon many things), then you may indeed have trouble. If you're traction limited due to not having some of the stuff above, then gears might not help. Otherwise, even cars with all our weight in front can be made to hook. BTW...90/10s suck. :) Agree that low-rpm power is much better with the 03/04, and that the 03/04 can make much better use of the 3.55s than the older cars would have. In other words, they are better matched to the powerband than a 99/01 Cobra. However, with traction, you would still accelerate faster if you can multiply that torque. This would be especially important off the line, as you spend ~12-15% of your ET in the first 4.5% of the 1/4 mile, meaning gains here (be it traction and/or improved acceleration through gearing) pay off big time at the other end. Anybody spending $1000 on an IRS gear swap has issues. :) Not sure I follow you here, but so long as you didn't over-gear the car, and so long as you were able to get traction, the car will accelerate with whatever gear maximizes average HP in each tranny gear through the 1/4. I think that's one of those "indisputables" we had above. ;) BTW...I'd also like to again caveat that gear choice for automatics is quite different than what we are talking about here. Disagree mostly. Just being heavy is misleading - you have to consider power-to-weight. Nose heavy only hurts if it prevents you from getting traction. Once you have traction, it is irrelevant. I think it is due mostly to poor gearing, relatively modest driving (few people have pro-shifted trannies or really powershift their T56s with no regard to breakage), and traction-limited conditions. Ya, it will all be done at once. Data would be nice, but I have a pretty fair idea of what works, and have my mods already planned out. Among other things, and as you alluded to, it makes no sense to through the live axle in without the gear, springs, shocks, and control arms of my choice. Though I don't think you can say definatively that it wouldn't help ET, it certainly might not if you don't have traction. I think I need to go count the amount of times I posted the word "traction" in this thread. :) Hope you had a Merry Christmas. Bob [/QUOTE]
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