Are weight jacks suitable for a daily driver? I have the Eibach pro kits. They sit a little high for me. The sport lines may be to low because I live in an idiot city that puts idiotic speedbumps in the middle of the street. I'd like something just slightly higher. Do the weight jacks allow for a normal ride or to they hammer your spine?

 

I have them w the higher spring rates. They are very height adjustable obviously. That said if you're concerned just get the lower spring rates. I have the UMIs in the front and rear and with the higher rates, I like the way it rides but some people may want it softer. The only issue I see with a daily driver it corrosion and the adjusters/pivot points. Mine are thoroughly greased but some road salt could be an issue I'd imagine. I've had them for 1.5 yrs and the car doesn't see rain.

 

I too have them and don't feel a significant difference from when I had sportlines. I am super low in the front but can navigate speed bumps. If it were my daily, I'd raise it up a bit. I believe I have the 850 lb springs, but I may go stiffer. It rides fine, but at high speeds (100+) the front end gets a little "light". Make sure you pair them with a quality strut cap. Avoid the Ebay ones. They made it feel like I had concrete for springs.

 

When you install weight jacks do you still need the isolators up at the top (front and rear)?

 

I don't believe there are isolators on the front springs. If there are, mine are long gone. I see no reason why you couldn't use them though.

 

I didn't use any of the isolators. It's been fine that way.

 

Weight jacks are just adjustable spacers (for lack of a better term). They're not designed to improve handing over a properly selected set of springs. They're designed to allow four corner "weight" tuning so you can really fine tune your suspension performance. Don't get me wrong, you need special equipment for that, and many of us use them to be able to fine tune the ride height. (I am, lol) You can use a weight jack with any spring rate, so long as you can FIND the spring. Each manufacturer will offer a few springs rates, but there are countless springs out there, so you can set it up to be just as soft as stock if you want. You just have to keep in mind that a soft spring with a lot of travel may cause trouble if you go really low. -But it's not like it's the weight jack itself that's causing an issue in that case. So to answer your question, no, they're not softer or harder of a ride than any other set of springs.

...and when you choose the springs, make sure you read both parts of Shifty's statement. 850 pounds may not be enough .....for 100mph+ driving. My point is to be honest and buy your car parts for the way you drive your car. NOT the way you THINK you drive your car! I'm running a 750/175 spring combo on my 88 with Ground Control weight jacks, along with yellow Koni's and a full compliment of suspension components, and up to at least 75mph of sprited back country rode driving and irresponsible on and off ramp encounters the car out handles my modded BMW e46 and it hardly feels far from stock under 50mph. Under 75mph I'd put the combined ride AND handling characteristics up against any thirdgen. That's where I drive the car. Now over 75....NO DOUBT it's just not enough to control the transfer of weight in a spirited or race driving environment. -but that's not how I drive, and I know it,sooooo I made my choice. Be honest with yourself.

 

I have the UMI (850s) and they are ok. I have not noticed much difference from the Eibach Pro Kit. I was able to lift the front to almost normal ride height.

https://www.thirdgen.org/forums/susp...-failures.html

 

I kept mine in the front

 

No problem at 150mph with UMI 850s weight jacks in front lol. Of course the car is sharp and well looked after with regular inspections on my hoist. It's more the road rut, pot holes, animal action, other drivers, law enforcement and tire blow out that concerns me. Not the handling in straight line.

 

My sentiments exactly. My car points and goes, its unbelievable actually. But long hard acceleration pulls really take "super handling" to "super sketch control". I am still learning the car, and maybe adding more damper to the konis may help, but I will likely have to go to a higher spring. I don't drive like this often (I am getting older and wiser and just a different kind of stupid now), but when I do, I don't want to feel like I am flying a kite.

 

Thanks for the input. Definitely won't be doing any 100 mph driving, not around here. Just a street machine for me with some spirited driving.

 

Weight jacks result in a shorter length spring and I think the lowest spring rate (front) is somewhere around 700 lb/in before coil bind. I suppose a lower spring rate would be possible with larger wire diameter and fewer coils but that's generally not how the springs are constructed from what I've seen.

 

When I bought my 750# springs, Ground Control told me that "officially" they didn't recommend springs lighter than 800 for use with their jacks, but off the record, they felt that there would likely not be an issue. ...and to that point, I've had no issues with any driving that I've done. I drive it hard, but as I've said before, I don't track the car soooo.....take it for what you will.