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IRS vs. Solid axle
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[QUOTE]Originally posted by 1Sicgt: [QB] [QUOTE]Originally posted by Mach0ne351: [qb] excellent post John...but i think the Solid axle diff cover is weaker then the IRS one..the IRS atleast uses a good piece of aluminum to cover that darn pos lol instead a tiny little piece of sheet metal as all GT and MAch1's have....but overal, the LA will be cheaper, lighter, and be plently of handling power, with some added parts (roughly $1000-$1200) worth in parts....even the LA gets wheel hop. i drive my wifes 01GT, and it has wheel hop as well, but not as bad as the stock IRS unit did in mine... yes, the solid axle MIGHT put some more power down coming out of a turn, but without the proper mods to the solid axle, the IRS unit will put more power down DURING and IN the turn. when a solid axle unit is put under cornering situations, one side goes down, and one side goes up. with an IRS unit, their both down, and independant. so, that's why many people say "coming out of the turn, the solid axle puts down the power." that's because it was made for going straight. if i was to do a LA swap, i would do it right the first time, and put a 9" rearend, and add MM torque arm, panhard bar, LCAs, UCAs, and add Hans Subframes while im at it....then 3.73/4.10 gears. the one thing i love about working on a car with an IRS is, exhaust work (mid pipe and back) is CAKE compared to the solid axle. getting exhaust over the axles (or off the car), can be a bitch with jack stands...on a IRS equipped car, it's 15min of work...on and off.... there are advantages to both, as well as disadvantages...ill stick with the IRS, as everyone probably already knows :) marek [/qb][/QUOTE]Ok, first thing is the IRS has an aluminum cover yes, but just becuase its thick and its aluminum doesn't make it good. It is actually a really waek sand casted cover. The mold is made out of a sand base, then the molten aluminum is poured in, which by the way is not the best grade, they use a 2000 grade aluminum, which is a cheap commercial grade of aluminum with a higher copper content. The higher content of copper is supposed to keep temps down disapating heat better, but the main problem is in the casting. The form used, commonly gets a pits in the metal. Not visible to the working surface, but once you cut into it, you see air pockets. Hence why alot of failures have been happeing. If done correctly they should have used a 7000 series tooling aluminum for the stregnth it has. Down side to it, it doesn't disapte heat as well becuase it is a more dence* material. Now you proved my point with out knowing it Marek. Problem is, the IRS' lack of negative camber gain effects it through the WHOLE turn from start to end. The design of the ford IRS was based upon street driving, and street feel. A street car is supposed to make tire noise before breaking loose in a corner. If the car was to gain correctly like we need it to for the track, It would not get tire squeal from the positve camber it is gaining, and then just snap loose without warning. Unlike us, who know how to determine the breaking points of our cars, the avg. Joe, wouldn't realise he is loosing control unless he hears it first. This is one reason ford didn't do the IRS design correctly. With IRS you actually have more body roll. straight up its the design of the suspension. Imagine you are looking at the rear of the car. On a stick car, as the right rear compresses, it transfers the load upward on the right rear tire, actually lifting the left rear upward too. This can be very bad if this happens too fast. This is where the solid rear feels light, and on the edge of spining. (Good driver would be able to know this feeling and compensate) Now with the IRS same thing being, the car body has to transfer its weight onto the right rear as it compresses. The left rear will lower and keep forward drive initally, but since the right rear is now leaning on the positive side the tire is actually scrubbing speed, which will do one of two things. If the transfer is too fast, it will feel like the car is sticking then violently break loose. Or, it will instantly give the front end a push, making the car not want to turn, thus loosing more speed. Remember slow in fast out. Its hard to be fast out it the car is pushing. The Looseness of a solid, is (stock vs. stock) Closer to wear you would want to be. Fast cars drive on that edge of in control and out of control. Its hard to be there if you have a built in push. ;) Hell, just for shits a giggles, we are planning on doing the SVTOA event in buttonwillow in end of Oct. early Nov., lets swap cars for a few laps, no bias, and see what lap times fall. I will put down my solid, lower hp car will get faster times. You game?? [/QB][/QUOTE]
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