KW suspension Spring flip thought process

[jdzumwalt]

Originally Posted by gmookher

interesting post:

My take reading it was that your rear is too stiff with your setup in relation to your nose

have you tried a stiffer front sway?

does KW offer only one spring setup with this kit?

I dont think the rebound valving is your issue. What rubber are you running?

do you kno what rates your running currently?
dont go changing rates without attention to bias front to rear, and dont forget your sways affect spring rates when in corners.

The KW come out of the box at 6kg front and 7kg rear. This comes out at 340 front and 400 rear.

From my offroading experience.

We have the following happen. Front inside tire comes up= add rear sway bar.

We never have the rear lift but I also have 28" of travel so this is almost imposible.

So based on this, if the rear is coming up. Then adding more front sway control and or a stiffer spring may help.

What about this. Slightly lower rear spring rate to improve ride quality and front sway to help control weight transfer. As of right now I already have some compression valving removed from the rear to help soften it up a bit.




This is what I'm used to shock tuning.

[fatoni]

Originally Posted by jdzumwalt

After doing so more research I noticed my auto LSD is kicking in. This means one of my rear tires is coming off the ground in certain situations.

If I add spring rate to the front this should keep the rear more planted?
Or should I remove a little spring rate in the rear to help it articulate?
I also could run the front end of the car a tad bit higher than it currently is to get more weight to the rear.

if your lsd is a torsen then thats the exact opposite of what would be happening as a torsen type wont work if one of the drive tires lifts. if lift is what you really think is causing your problem (which i doubt) unbolt your rear sway bar so the wheels move more independently. that will cause the rear to jack up on turns though which is another one of your problems.

[jdzumwalt]

The Unsettling rear happens in turn 8-9 and turn 12 and 13. The dash blinks letting me know the rear is getting wonky. I have all the nanies turned off. I saw this little light coming on as I transition in the turns. Looks to be one more hidden nanny buried in the ECU.

[OrbitalEllipses]

Does the nanny light up ONLY during trailbraking?

[nix]

Even with the nannies turned off the 'hidden' VSC will send ABS pulses to the outside rear wheel under lateral slip.

You can disable all nannies via this method from 086A: http://www.ft86club.com/forums/showp...8&postcount=15

Options to permanently disable it include pulling the ABS fuse from engine bay fuse box ... not a great one since it disables front ABS too. Or installing a physical override system like this: http://www.autofactory.jp/product/to...?mode=s&seq=14

PS. Great thread, I am a bit of a suspension noob, my KWs are coming soon and looking forward to dialling them in right.

[jdzumwalt]

Originally Posted by OrbitalEllipses

Does the nanny light up ONLY during trailbraking?

I don't think it's really a trail braking issue. On the exit of turn 8 I'm usually at about 80-85 mph this is kinda of a off camber corner to turn 9. The light will blink at me just after the kink.

I then try to settle the car because turn 9 is like second gear for me.

Just for a reference I'm not extremely fast. I'm clocking in at 2:10 at this track right now.

But I am hoping to shave down some more seconds. I heard Crawford ran a 2:02 before they went turbo.

[gmookher]

Originally Posted by jdzumwalt

What about this. Slightly lower rear spring rate to improve ride quality and front sway to help control weight transfer. As of right now I already have some compression valving removed from the rear to help soften it up a bit.

I have some custom valved reservoir short body bilstein 7100s on my land rover, what you do off road for baja or rock crawling, and what you do on the tarmac are similar, but not quite the same. dang 28", thats alot of travel.

I'm betting your gonna benefit messing with the front to fix the back. Get rid of the OE front sway bar 1st. Try a stano, or a 20 or 22mm front adjustable set soft. get back to us. These things take time, I may have missed it, what tires are you on?

I dont think your rear rate is TOO soft, so I would go there last after everything else. You may get other advice and ideas from others. I think your finding the front end too soft, but reading it thru the rear. Can you lower compression valving in the rear,just a hair, and loosen up rebound a bit? Make small, singular adjustment, TAKE NOTES, and revisit. keep us posted, thanks

[jdzumwalt]

Originally Posted by gmookher

I have some custom valved reservoir short body bilstein 7100s on my land rover, what you do off road for baja or rock crawling, and what you do on the tarmac are similar, but not quite the same. dang 28", thats alot of travel.

I'm betting your gonna benefit messing with the front to fix the back. Get rid of the OE front sway bar 1st. Try a stano, or a 20 or 22mm front adjustable set soft. get back to us. These things take time, I may have missed it, what tires are you on?

I dont think your rear rate is TOO soft, so I would go there last after everything else. You may get other advice and ideas from others. I think your finding the front end too soft, but reading it thru the rear. Can you lower compression valving in the rear,just a hair, and loosen up rebound a bit? Make small, singular adjustment, TAKE NOTES, and revisit. keep us posted, thanks

I have though about this some more. The next two steps for me are going to be increasing front springs and Front Strut tower brace/camber plates.

My hope is that by doing this, will help the car from nose diving, and should keep the rear more planted during braking.
Second, the Stiffer spring's should help keep the rear more planted during left to right transitions.( If I need more I will add a sway bar to the front.)

The Strut tower Bar should just improve the overall feel helping maintain control through reduced chasis flex. I dont want to go to stiff because I think the chassis will wear out quicker if everything is super stiff especially If I dont have a cage.

I will add Go pro's to my suspension components to help tune.

Food for thought.

Gregg

[CSG Mike]

Originally Posted by jdzumwalt

I don't think it's really a trail braking issue. On the exit of turn 8 I'm usually at about 80-85 mph this is kinda of a off camber corner to turn 9. The light will blink at me just after the kink.

I then try to settle the car because turn 9 is like second gear for me.

Just for a reference I'm not extremely fast. I'm clocking in at 2:10 at this track right now.

But I am hoping to shave down some more seconds. I heard Crawford ran a 2:02 before they went turbo.

Not quite THAT fast. http://www.mylaps.com/results/showrun.jsp?id=2392393

They also ran a 1:59 the one session the car was run with the turbo, although I don't believe it's indicative of the car's true potential, as it was the first time on track after it was boosted. http://www.speedventures.com/results...id=-2146754468

I don't know what tires they ran on those days.

Dan Gardner ran a 2:02 that weekend on I believe BFG R1.


How bad was your trail braking issue? I've been fighting that issue as well to a degree...

[jdzumwalt]

Just got back from a 280 mile drive. I had to meet a contractor out in El centro. This drive is great I had quite a few 90 mph to 30 mile corners come up. I spent a good amount of time really analyzing whats happening to the car. The rear just feels light in the braking zones. On the street this really isn't much of a problem I dont brake that late and I drive a lot more conservative on the road.


On the track when looking for that last possible inch before turn in. Is when the car gets the most unsettled. I will order springs keep you guys posted on my thoughts with this.

[Racecomp Engineering]

Have we talked about your alignment?

- drew

[jdzumwalt]

no talk of alignment yet. I'm a slight toe out. I think .12 degrees out on the front with zero on the rear.

[Racecomp Engineering]

O rear camber?

- drew

[jdzumwalt]

Camber is 1.5 for the front 1.7 rear