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SVT Shelby GT500
Broken Or Cracked Crank?
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<blockquote data-quote="500_man" data-source="post: 11463209" data-attributes="member: 128873"><p>Interesting. I launch my Cougar with a 2L Kenne Bell @ 3500 RPM on the 2-step dozens of times. Dead hook and it just lifts the front wheels a tiny bit. Mostly everybody at the dragstrip who got tired of inconsistent 60' times uses one (which is most of the more experienced people.) I have programmed a 1st gear timing pull (load vs. RPM) to ensure that the tires don't break free. The 3500 RPM is the stored energy and the exponential release of power as timing is added back in is the surge off the line. Everybody compliments how consistently I launch and they love the low steady wheelie it does. </p><p></p><p>Now I've learned some important lessons - I used to launch at 6000 RPM, but the Eaton E-Locker I used to have blew up after that. I tried one launch @ 5k with the TruTrak and it bound up tight, almost destroying it, thus the lower launch RPM. I also don't mat the throttle at launch - that just whiplashes the blower for no good reason - I hold it just at the point where the 2-step starts to limit - then mat it as I release the clutch in one smooth motion - right foot down, left foot up simultaneously. </p><p></p><p>So my question is - why is it a problem to launch a GT500 with a consistent amount of energy stored in the flywheel? I could see if one had an aluminum flywheel and held the accelerator to the floor while sidestepping the clutch, but that wouldn't work very well anyway and would potentially damage the blower (normally the case) or crankshaft in the case of the GT500 which seems to have a wimpy nose.</p><p></p><p>I think a blanket "never ever use a 2-step" assumes the worst case scenario. I can see a vendor issuing caution, but there are ways to successfully use such a device. The electronic throttle makes it all the easier to hold the throttle at a set position and release it smoothly at launch, doesn't mean a human isn't capable of doing the same thing.</p></blockquote><p></p>
[QUOTE="500_man, post: 11463209, member: 128873"] Interesting. I launch my Cougar with a 2L Kenne Bell @ 3500 RPM on the 2-step dozens of times. Dead hook and it just lifts the front wheels a tiny bit. Mostly everybody at the dragstrip who got tired of inconsistent 60' times uses one (which is most of the more experienced people.) I have programmed a 1st gear timing pull (load vs. RPM) to ensure that the tires don't break free. The 3500 RPM is the stored energy and the exponential release of power as timing is added back in is the surge off the line. Everybody compliments how consistently I launch and they love the low steady wheelie it does. Now I've learned some important lessons - I used to launch at 6000 RPM, but the Eaton E-Locker I used to have blew up after that. I tried one launch @ 5k with the TruTrak and it bound up tight, almost destroying it, thus the lower launch RPM. I also don't mat the throttle at launch - that just whiplashes the blower for no good reason - I hold it just at the point where the 2-step starts to limit - then mat it as I release the clutch in one smooth motion - right foot down, left foot up simultaneously. So my question is - why is it a problem to launch a GT500 with a consistent amount of energy stored in the flywheel? I could see if one had an aluminum flywheel and held the accelerator to the floor while sidestepping the clutch, but that wouldn't work very well anyway and would potentially damage the blower (normally the case) or crankshaft in the case of the GT500 which seems to have a wimpy nose. I think a blanket "never ever use a 2-step" assumes the worst case scenario. I can see a vendor issuing caution, but there are ways to successfully use such a device. The electronic throttle makes it all the easier to hold the throttle at a set position and release it smoothly at launch, doesn't mean a human isn't capable of doing the same thing. [/QUOTE]
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Broken Or Cracked Crank?
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