Ground Control

[Holland]

Awesome. I felt stupid for asking but I never hear anyone specify.

[Jean]

Ground Control makes a line of different products. You can purchase a GC "kit" with your choice of front and rear springs (height / stiffness) with sleeves. Front or Rear strut brace is in no way needed.

[Holland]

Ok, just to jump in I have one really dumb noob question that I'm a bit embarrassed to ask. Ground controls are strictly coilover, or do they have the seperate shock and spring? IIRC for rear coilovers you need a rear strut brace?

[Jean]

Others with more experience with those will chime in, I've only ran a sparco front upper bar for a few months before I sold it. I haven't tried a rear bar yet. It probably won't make anything worse, it doesn't make a huge difference like sway bars or anything else though.

[D-rock]

How about strut braces in the front and rear?

[Jean]

Yes, in an E30 I run only with the front sway. Shocks make a huge difference, not only in handling but also in comfort.

[D-rock]

Every car is different, but with the e30 and it's "old" rear suspension adding a rear sway bar only makes it "worse" by making it less "independent". That is why many choose not to run a rear sway. (To compare, my one of previous autocross cars was a FWD GTI and it had a 28mm rear sway to help the car rotate more, but these two cars are totally different).

You can tune the suspension with springs/shocks/alignment/tires or less spring/shocks/tires/alignment and more sway and vice versa.

Drive both and figure what you like. Keep everything the same and switch from let's say 140 trearwear tire to 30-40 and your suspension will work more, car will lean more.


http://books.google.com/books?id=BJU...ngs%3F&f=false

WOW nice link thanks will have to read that up!
So you only have a front sway bar? How about struts do they do anything?

[Jean]

Why would you need a higher spring rate cause of sticky tires? Also does the rear bar do much at all ?

Every car is different, but with the e30 and it's "old" rear suspension adding a rear sway bar only makes it "worse" by making it less "independent". That is why many choose not to run a rear sway. (To compare, my one of previous autocross cars was a FWD GTI and it had a 28mm rear sway to help the car rotate more, but these two cars are totally different).

You can tune the suspension with springs/shocks/alignment/tires or less spring/shocks/tires/alignment and more sway and vice versa.

Drive both and figure what you like. Keep everything the same and switch from let's say 140 trearwear tire to 30-40 and your suspension will work more, car will lean more.

http://books.google.com/books?id=BJUVdn5SMBgC&pg=PA28&lpg=PA28&dq=sticky+tires+stiffer+springs%3F&source=bl&ots=rOawd_RHxv&sig=M0vCkq5p95MBEltjM1llNo02uJU&hl=en&ei=vbhXS7qUEYrWsgPb9InGBw&sa=X&oi=book_result&ct=result&resnum=3&ved=0CA8Q6AEwAg#v=onepage&q=sticky%20tires%20stiffer%20springs%3F&f=false

[khnordeen]

Sleeves aren't different, but if you order camber plates you do want to specificy what inserts you'll run so they can ship you correct spacers (or whatever they are called) that go over the threaded end of the front inserts.

Hi Jean,

Thanks a lot for the quick reply.

I was getting nervous for a minute, but now my mind is at ease. Thanks again! :D

-Kyle

[D-rock]

500front/650rear with no rear bar, worked great in autocross. sold it to to switch to higher rates with the engine swap and wider/stickier tires.
I will probably end up with rates similar to what z31maniac posted above.

Why would you need a higher spring rate cause of sticky tires? Also does the rear bar do much at all ?

[Jean]

Sleeves aren't different, but if you order camber plates you do want to specificy what inserts you'll run so they can ship you correct spacers (or whatever they are called) that go over the threaded end of the front inserts.

[khnordeen]

Are there any differences in the sleeves themselves depending on the shocks/struts that will be paired with them?

I am currently waiting on some Bilsteins in the mail, but some sleeves I have come across I believe have been paired for Konis...

I'd call GC directly, but they are currently closed...

Thanks for any help.

-Kyle

[BigD]

550/750, because GC told me this is about the most the regular Koni SAs can handle while leaving a smidgen of adjustability. It feels fine on the track but it could definitely be better. After the turbo, I'll be doing a new suspension with 4 figure rates (front for sure).

[z31maniac]

I will probably end up with rates similar to what z31maniac posted above.

Good rates to be sure.

And you v710s will prevent the traction issues I was having!

[Stephen]

300/500 and happy. If they come around at the right time i might bump up ro a 350 up front but its not really that big of a deal. Running fairly aggresive fitment as well