Kerrrslammed - GC Coilovers complete!

[blefevre]

Ah, taller/softer springs with remote dampers will do it. I probably cant do that without raising the cars height or some fab work though.

[Bimmerman325i]

Ah, taller/softer springs with remote dampers will do it. I probably cant do that without raising the cars height or some fab work though.

Ride height I don't think went up much, and there wasn't any fab.

Read through this thread, it's interesting to see where they started from (ast 4100) and ended up (way custom 4100/4300 hybrid): http://forums.bimmerforums.com/forum...d.php?t=858257

[Bimmerman325i]

This post, specifically: http://forums.bimmerforums.com/forum...&postcount=276

OP, that car's build is a good one to mirror. The Vorshlag guys have done a considerable amount of testing on an E30 autocross car, and all the suspension tricks will be helpful for you.

[blefevre]

"A dual coilover+tender spring set-up was added to the rear to allow the spring to remain seated at this extreme droop travel. "

More info?

[Bimmerman325i]

http://vorshlag.smugmug.com/photos/323833840_k5uog-S.jpg

http://vorshlag.smugmug.com/photos/321486129_49ALg-S.jpg

Basically, added a tender to the coilover spring in the rear.

[blefevre]

So on a normal coilover kit (GC) does the rear actually bottom out from the shock or is the spring the limiting factor? I didn't see them mention the spring rate of the rear.

[MisterMiniS]

So, I have been informed of two main routes.

1) Giant rear springs and no rear bar
2) Not giant rear springs and a beefy rear bar.

I agree with Bimmerman and that I want as much travel as possible to keep inside rear on the ground, yet be as stiff as possible. I know that I can get different rates, but for now I have shock adjustability and can add, remove, change sways.

I think I will get a lot of feedback saturday as to what the car needs. I am going to look at that Vorschlag e30 and read up on that.

[Bimmerman325i]

Spring rate was mentioned, 570lb. On a GC kit I have no idea, I think the issue is the amount of droop travel of the shock, not bump travel. Since the spring isn't held captive under droop by anything, the spring shouldn't be the limiting factor.

[Bimmerman325i]

So, I have been informed of two main routes.

1) Giant rear springs and no rear bar
2) Not giant rear springs and a small/stock rear bar.

I agree with Bimmerman and that I want as much travel as possible to keep inside rear on the ground, yet be as stiff as possible. I know that I can get different rates, but for now I have shock adjustability and can add, remove, change sways.

I think I will get a lot of feedback saturday as to what the car needs. I am going to look at that Vorschlag e30 and read up on that.

Fixed, but yes. All the suspension engineering theory in the world will be less useful than thorough testing. More travel would help, but the cost to get that more travel is much higher (you could probably call Chris at SCR up and ask about rear remote shocks cost). I wouldn't really worry about it, but try with/without your stock rear bar with actual timing and data acq if you can (iphone-- trackmaster or some such). Feel is subjective, numbers don't lie. Numbers are also useless unless you're a consistent driver.

[blefevre]

So, I have been informed of two main routes.

1) Giant rear springs and no rear bar
2) Not giant rear springs and a beefy rear bar.

I agree with Bimmerman and that I want as much travel as possible to keep inside rear on the ground, yet be as stiff as possible. I know that I can get different rates, but for now I have shock adjustability and can add, remove, change sways.

I think I will get a lot of feedback saturday as to what the car needs. I am going to look at that Vorschlag e30 and read up on that.

Keep us updated! I have been pretty nervous with just getting the "basic GC" kit. I want to make sure I do it once and do it right.

[Bimmerman325i]

Keep us updated! I have been pretty nervous with just getting the "basic GC" kit. I want to make sure I do it once and do it right.

What's your budget?

You could do a hodgepodge of singles front and remote doubles rear, that shouldn't be too much more, cost-wise over the singles, and provide lots of travel. But, diminishing returns and points and all.

Ben has proven, and quite well, that stock front/rear sways with the basic GC singles kit with the shortened housings is a very effective and devastatingly fast setup.

[blefevre]

$2,500 or so, maybe more if there is a reason.

I don't want to make the rear end more nervous by getting very stiff rear springs. Not only for track but for driving in the rain too. I'm not worried about the fronts, just getting shortened housings, but the rear is where I have options. I don't want to go bigger then my M3 rear sway bar either.

[MisterMiniS]

Not only for track but for driving in the rain too

Me + Rain last night = tokyo drifting everywhere (granted I WAS trying).

On a related note, Mayfield and some other SCR guys will be at the race. I will see if I can get some of them to ride along and offer suggestions (who knows).

I will be documenting everything I possibly can. This car is for autox, but my budget is not limitless :p. That said I am all for changing the setup over time until I am satisfied.
I like to think of myself as a consistent driver, but with so few runs, and changing tire temps, it is kinda hard to tell.

[blefevre]

But at least you have parts and are testing. It will be good information as you have stiffer springs then Ben.

[Bimmerman325i]

Yup, keep observations coming! Brad, I'll get on gchat when i'm back at work and we can talk suspensions to keep from hijacking further.