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I would like some thoughts on making my truck pull the front wheels off the ground with a MN12 out back.
Last edited by elgemcdlf (7/28/2012 8:14 am)
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Can it be done? YES
will it be easy??? Not even a little
The number one downfall of any IRS is getting it to hook up when launching hard. To do a wheel stand you must get it to hook up and that will be a big challenge.
the second issue you will have is making it strong enough to handle that kind of torque. The more complicated the system the more parts that can fail. Making one part or section of the system strong enough will often times shift the torque elsewhere and something else will fail.
Like I said it can be done but it will not be as easy as it would be with a live axle.
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Well, you're running a 460 and a C6?
I'll be running a 525ci stroked 460 and a built 4R70W.
I've been advised by people whose opinions I trust on this that I'll probably bust the diff, if I fix that without beefing the axles I'll bust them next, once they're fixed I might bust the transmission.
So...if you want to do what you're planning to do, you're going to need to talk to someone like DSS who makes the axles and 35-spline hubs for that segment of the dragstrip '03-04 Cobra community who hasn't switched to a stick axle.
Me, I'll be gentle for now, as I have lots of other things to spend money on before I go throwing another $2500 at the rearend.
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I've always thought that one could employ some hydraulic or pneumatic cylinders to "lock" the UCA and LCA from moving up and down for an all out launch.
Once done at the end of the track, disable the locking cylinders.
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I guess some here may recognize when a IRS squats the rears camber. Not staying flat on the road surface. Here is a thread from days gone by. Dragvette built a conversion for the C2/C3 that removes any camber.
Wheelie Bars Thread
Dragvette
Dragvette 6 link C3/ Removes Camber
Ralphy
Last edited by Ralphy (8/07/2012 11:16 pm)
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One way you can do wheel stands is to have purpose built truck with the engine behind the cab 
Just kidding, thats a lot of work and renders the bed unusable.
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My guess is it would depend entirely how heavy the vehicle is that you want to lift its own front tires. If the 8.8 diff is to survive the vehicle must be very light. Weight distribution will also plat an important roll.
I found that on my sand rail a mid engine lay out with the engine behind the driver but ahead of the differential produced ideal weight transfer to lift the front tires on launch and could hold them 12 inches off the ground for 300 feet when I would lift off the throttle. Keep in mind the vehicle weighed 1100 lbs and had over 350 hp. 65% of that weight was on the rear tires when at rest.
I also built a V8 mid engine two door Falcon wagon that could lift its front tires on its way to low 10's high 9's in the standing 1/4, The Falcon weighed 2600 lbs. with about 68% on the rear tires. The big drawback of this design was it didnt stop very well (the skinny front tires would just slide) and equipped with a spool it didnt go around corners worth a damn! (UNDER STEER) A whole lot of fun as a teenager but I wouldn't drive that car on a bet now..
It sounds like you have plenty of HP to work with but I really dont think you could build a light enough vehicle for the 8.8 survive behind it. Racing slicks would be required and even in a light platform, the shock load would really push the MN12 design beyond its limits.
There are lots of full size pu's that can do wheel stands. The ones I have seen were short box and had the rear axle relocated a little forward of the stock position with a four link live axle suspension. The engines were set back far enough that at least the four rear cylinders were past the fire wall. Simply put, Your truck would have to be purpose built for the task.
Last edited by tyrellracing (8/11/2012 1:16 am)
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