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Old 02-10-2005, 06:31 AM
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250lb coilovers max?

I have a 4 link rear suspension with 130lb rear coil over springs. Im pushing a little over 500hp with the motor and when I take off hard the body is rolling so much that the body is digging a hole into the passenger rear tire. So naturally I went to a heavier spring. I jumped up to a 200lb spring. No difference, same thing. I adjusted different angles on the 4 links and same thing. I was told by my local auto parts that they can only buy springs up to 250lbs and those are for 4000lb cars. My car being only 2000lbs shouldnt need something that strong according to them, so I thought I would run it by you guys so see if this sounds right. They are trying to sell me a 400$ sway bar system because cars should need anything over 200-250 springs. What do you guys think. The car is an 87 samurai with a 408windsor. Actual weight is 2,220. Ford 9" with triangulated 4 link. Im not against a sway bar if thats what I need, but I would like to know what the ball park rates are for street-strip cars using coilovers. It is true that 250 is the max or is it common to see cars using 400-500. Anyhelp or ideas?


Ben

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Old 02-10-2005, 07:22 AM
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Are you sure your problem is at launch? The tires grow as mph increases and will touch the body as the car settles down, at speed. I have seen the problem many times, as I sit in the tower. Watching tire smoke on top end.
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Old 02-10-2005, 11:11 AM
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It does this from launches only, from a dead stop. The tires are not really spinning enough to ballon up because its hooking up pretty good. The body is hitting on the outside of the tire not the middle, and it hits even with 1 quick press to 1/2 throttle. So my question really is if I need stiffer springs or a sway bar. Generally speaking the rear seems pretty soft. I can sit on either side of the back of the car and it drops a good 1.5".
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Old 02-10-2005, 12:01 PM
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How about a limit bumper, to restrain the travel?
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Old 02-10-2005, 03:20 PM
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Although that may work, its not really a fix. I had thought about doing that but one of the problems is that, when it hits the stopper hard, I may lose traction.
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Old 02-10-2005, 03:35 PM
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At launch, the torque at the back end of the driveshaft is acting to unload the right rear, as you know, but the reacton torque at the front end of the driveshaft is taken through the transmission and engine mounts, where it tries to roll the chassis. In your case, that chassis roll is excessive. So, these guys that want to sell you something to reduce roll are on the right track, but you want to use some discretion in how you do it.

In the first place, if the car has a front sway bar, I'd recommend that you remove it. Yes, this would appear to be a move in the wrong direction, but I'm not done yet. You want to increase roll resistance, but you don't want that roll resistance to be at the front of the car. Why? Well, think about those torques at the ends of the driveshaft. They're equal and opposite. Now, since the torque at the rear of the driveshaft is causing an imbalance of rear tire loadings, wouldn't it be disirable to cancel that effect? But, to cancel the effect, you need all of that torque at the front of the driveshaft. You can't afford to "lose" any of it as it acts to cause an imbalance of the front tire loads.

In other words, the resistance to that torque needs to be as much to the rear as possible. You'll always have some roll resistance at the front, of course, but you need to minimize it.

So, yes, you need to buy a sway bar, but it is to be a rear swaybar only!!!
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Old 02-11-2005, 02:29 AM
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I have 350lb springs on my QA1 coilovers.
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Old 02-11-2005, 07:24 AM
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jc55 how much does your car weigh?
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Old 02-11-2005, 07:51 AM
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Why not move the right side links?

Why not increase the split in RR?
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Old 02-11-2005, 12:39 PM
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Just thinking

Quote:
Originally posted by johnsongrass1
Why not move the right side links?

Why not increase the split in RR?
Just put the 200 lb spring on the right side only..raise the right side links keeping the left side neautral and try that..and like Billy said tossout the front sway bar..

Have your buddy ther with his video cam so you have a record to see just what is going on..

OMT

Oh and take notes..
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Old 02-11-2005, 05:15 PM
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My car weighs 3020lbs. I run the 350lb springs at 30 degrees for something like an effective 260ish lbs(forgot the formula off hand)
I know of other '55 owners running 350 springs at 90 degrees with no problems, just a really stiff ride.
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Old 02-11-2005, 05:36 PM
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What brand of shock are you running? What diameter spring, 2.0", 2.25", 2.5" or 3"?

I just checked and Eibach sells 9 inch long 2.25" springs in pd ratings up to 1000 pds/inch. Sounds like your dealer is missing the last page of his catalogue.

Try the Eibach spring calculator and see what will fit your application.
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