Launching - someone may have found a way, 11.42@121
#1
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Launching - someone may have found a way, 11.42@121
In this month's GMHTP, there is a dude who dropped a turbo buick engine in a CTS and is running 11.42@121 with it. They don't mention any rear suspension mods, so either
1) he doesn't have any and the stock suspension is perfectly capable of launching, it's just the rock hard run flat tires that are hampering the CTS-V, or
2)he does have suspension mods that let him launch the thing, and someone can get ahold of him or GMHTP, find out what they are and apply them to a CTS-V to cure the axle hop
http://www.gmhightechperformance.com...s/0405htp_cts/
1) he doesn't have any and the stock suspension is perfectly capable of launching, it's just the rock hard run flat tires that are hampering the CTS-V, or
2)he does have suspension mods that let him launch the thing, and someone can get ahold of him or GMHTP, find out what they are and apply them to a CTS-V to cure the axle hop
http://www.gmhightechperformance.com...s/0405htp_cts/
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Originally Posted by WECIV
Is the wheel hop caused by IRS???
i.e. I don't think Corvettes have a big problem with it, see the late night video clip of Dale Jr putting on a smoke show in a Z06 - no wheel hop there. But IRS Cobras have some issues with it, as do some Porshce 911s.
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Originally Posted by WECIV
ZO6's have IRS???
As for the link to Dale Jr on the Late Show, I can't find it on CBS's web page anymore. Check the Corvette Forum.
#11
Originally Posted by WECIV
Do you have that clip???
Its the 7th one down.
"Dale Earnhardt Jr. on 53rd Street
(2/17/04)"
#13
IRS cars tend to wheel hop alot more because there is alot more deflection under load. Wherever there's a joint there is a loss of rigidity (i.e. where the control arms bolt to the differential housing or subframe or whatever). A live axle car only has to mount the axle and shocks, maybe a few suspension links to the chassis of the car. The IRS car has the rear suspension subframe, control arms, shocks, the differential, spindles, you get the point. That is alot of deflection underload. The suspension angles can get pretty odd under load. If the suspension is designed correctly, the parts can "lean on each other" for lack of a better term, and support one another increasing the rigidity of the unit significantly. Bracing is another way that manufacturers increase the rigidity of an IRS subframe. From what I understand one of the more serious issues with the earlier Mustang Cobra swas the entire assembly was to flexable and it was leading to problems with undesirable suspension geometry which caused the wheelhop that made such a bad first impression on everyone. Ford beefed up the subframe on the design and it made a remarkable difference in the reduction of wheelhop. Stiffer bushings will make a big difference to, but they will lead to a harsher ride, and more road noise transmitted into the car. Hope this helps shed some light onto the subject.
Roger Hewson
Roger Hewson
#14
Originally Posted by eswolfgang
He does not have much more power than the CTSV by the numbers at the bottom of the article. I think I might try a second gear launch to see how it does.
Roger