I saw this video of this 240 doing a 1/4 and its pretty dang fast, got in 12s or something. Its fast, but when it would accel the nose would race up like a ship, and then during a shift it would bounce down and up again. I just call it nose bobbing.

I dont remember if this car had been lowered or not, but what would solve this boat like going over waves action? ground control springs? regular lowering springs? sway bar? even tho thats mostly handling. Stiffer springs on the rear?

It sure does make a really fast car look really ugly when you see this. Its like wth?! even my car does this because its stock so nothing is stiff on this car and with my 155 hp i still nose raising and i know it even looks uglier from the outside.

i found this very helpful spring chart. It should be helpful to everyone...

s13 Springs

Stock 1992 (from FSM)
Front & Rear: 102 lb/in _ _
Front & Rear: 110 lb/in w/ HICAS

Stock 1990 (from FSM):
Front & Rear: 112 lb/in (base)
Front & Rear: 123 lb/in (sports package)

KGMM S21 Sport (Black)
Front: 3.2 kg/mm | 179.2 lb/in
Rear: 2.6 kg/mm | 145.6 lb/in

KGMM S21 SuperSport (Blue)
Front: 4.6 kg/mm | 257.6 lb/in
Rear: 3.8 kg/mm | 212.8 lb/in

KGMM S21 Racing (Silver/Gold)
Front: 6.6 kg/mm | 369.6 lb/in
Rear: 5.2 kg/mm | 291.2 lb/in

Eibach ProKit (Progressive)
Front: 114-200 lb/in | -1.8"
Rear: 114-148 lb/in | 1.6"

Eibach Sportlines (Progressive)
Front: 137-230 lb/in | 2.2"
Rear: 128-200 lb/in | 2.1"

H & R Sport (Progressive)
Front:2.0-2.08kg/mm | 112~116 lbs/in | -1.3"
Rear: 2.5-2.6kg/mm | 140~145 lbs/in | -1.3"

RSR Race Springs
Front: 279 lb/in | 1.4"
Rear: 251 lb/in | 1.2"

RSR Down
Front: 3.0 kg/mm | 167 lbs/in | 1.5" Est.
Rear: 3.0 kg/mm | 167 lbs/in | 1.2" Est.

Tokico
Front: 3.0 kg/mm | 169 lbs/in | -1"
Rear: 2.7 kg/mm | 150 lbs/in | -1"

TANABE GF210 (Grip Feeling)
Front = 2.9 kg/mm | 162 lb/in | -30to -40mm
Rear = 2.7 kg/mm | 151 lb/in | -15 to -25mm

Suspension Techniques: 1.3" drop
Front: 206 lb/in | 1.3"
Rear: 155 lb/in | 1.3"

Tein S.Tech
Front = 3.2 kg/mm | 179 lb/in
Rear = 2.9 kg/mm | 162 lb/in

5Zigen R-Rate (Progressive)
Front = 2.4-5.2 kg/mm | 134-291 lb/in | 1.3"
Rear = 1.9-5.0 kg/mm | 106-280 lb/in | 1.1"

S13 Coilovers

Nismo S-Tune (not height adjustable)
Front: 5.3 kg/mm | 296 lb/in
Rear: 3.9 kg/mm | 218.4 lb/in

Nismo N1
Front: 8/10/12 kg/mm | 448 - 672 lb/in
Rear: 8 kg/mm | 448 lb/in

Tein HA
Front = 6 kg/mm | 336 lb/in
Rear = 5 kg/mm | 280 lb/in

Tein HE
Front = 8 kg/mm | 448 lb/in
Rear = 6 kg/mm | 336 lb/in

Tein RA _
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in

Tein RE
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in

Tein RS
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in

Tein FLEX
Front = 5 kg/mm | 280 lb/in
Rear = 4 kg/mm | 224 lb/in

Zeal Function B-6
Sreet Spec:
Front = 6 kg/mm | 336 lb/in
Rear = 5 kg/mm | 280 lb/in
Circuit Spec:
Front = 8 kg/mm | 448 lb/in
Rear = 7 kg/mm | 392 lb/in

S14 Springs

KGMM DR21
Front = 4.8-3.0 kg/mm | 269-168 lb/in
Rear = 4.0-2.8 kg/mm | 224-157 lb/in

KGMM DR21 Racing (Silver/Gold)
Front = 6.6-3.2 kg/mm | 370-179 lb/in
Rear = 5.2-2.4 kg/mm | 291-134 lb/in

RSR Hard Springs
Front = 5.0 kg/mm | 280 lb/in
Rear = 4.2 kg/mm | 235 lb/in

TANABE SuperH
Front = 3.0 kg/mm | 168 lb/in | -28mm
Rear = 4.0 kg/mm | 224 lb/in | -9mm

TANABE DF210 (Dress Form)
Front = 4.7 kg/mm | 263 lb/in | -30to -40mm
Rear = 4.7 kg/mm | 263 lb/in | -15 to -25mm

TANABE GF210 (Grip Feeling)
Front = 2.8 kg/mm | 157 lb/in | -30to -40mm
Rear = 3.0 kg/mm | 168 lb/in | -15 to -25mm

TRUST Sport Springs
Front = 2.6 kg/mm | 146 lb/in | -25mm
Rear = 2.6 kg/mm | 146 lb/in | -25mm

HKS Super Sports
Front = 4.14 kg/mm | 232 lb/in
Rear = 3.46 kg/mm | 194 lb/in

Tein S.Tech
Front = 4.8 kg/mm | 269 lb/in
Rear = 4.4 kg/mm | 246 lb/in

s14 Coilovers

Apexi N-1 Coilovers
Front = 8 kg/mm | 448 lb/in
Rear = 6 kg/mm | 336 lb/in

Tein HA kg/mm
Front = 6 kg/mm | 336 lb/in
Rear = 5 kg/mm | 280 lb/in

Tein HE
Front = 8 kg/mm | 448 lb/in
Rear = 6 kg/mm | 336 lb/in

Tein RA
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in

Tein RE
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in

Tein RS
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in

Tein FLEX
Front = 6 kg/mm | 336 lb/in
Rear = 5 kg/mm | 280 lb/in

Zeal Function B-6
Sreet Spec:
Front = 6 kg/mm | 336 lb/in
Rear = 4 kg/mm | 224 lb/in
Circuit Spec:
Front = 8 kg/mm | 448 lb/in
Rear = 6 kg/mm | 336 lb/in

It's called weight transfer. :lol:

The nose rises under acceleration because the weight is shifted to the rear.
The nose dives under braking or shifting because the power isn't being sent to the rear, which transfers weight to the front.

You can reduce the appearance of weight transfer by modifying your suspension(stiffen it??), but it would be very difficult or even impossible to eliminate weight transfer.

You Can Counter Act That With Wheelie Bars And/or Stiffer Rear Springs. Remember With All That Weight Transfer Your Car Is Getting More Power To The Ground Because Its Giving The Wheels More Traction.

yes Mr Music is right again

it is actually GOOD for that to happen, it is slamming more weight onto the back wheels and holding them down....

if you put on stiffer springs or struts you are going to hurt your launching abilities... drag setups use lower spring rates and dampening in the rear.......

What You Really Want Is Stiff Springs Up Front To Prevent Nose Dives During Shifts And Heavy Braking....

if i get ground control, then i would have stiff springs all the way around right? or are ground control springs not even all that stiff just lower ur car? How can i get stiffer front and not so stiff on the rear to not loose the benefits of weight transfer. What should i look for as far as spring stiffness how do i know which are stiffer than others? by brand or do they have numbers? whats an average?

What Are You Trying To Accomplish? Drag, Drift, Road Race, Etc.?

Also The Ground Control Coilover Collars Are Super Stiff And They Are Downright Uncomfortable At All..... I Would Invest In Good Lowering Springs Or Real Coilovers Rather Than Waste The $200+ On The Gc Ones...

What Are You Trying To Accomplish? Drag, Drift, Road Race, Etc.?

Also The Ground Control Coilover Collars Are Super Stiff And They Are Downright Uncomfortable At All..... I Would Invest In Good Lowering Springs Or Real Coilovers Rather Than Waste The $200+ On The Gc Ones...

:1:

Sleeve overs are ass.

You Can Counter Act That With Wheelie Bars And/or Stiffer Rear Springs. Remember With All That Weight Transfer Your Car Is Getting More Power To The Ground Because Its Giving The Wheels More Traction.

Are you sure it will hurt you? Won't stiffer springs make more of the downward force be transfered into the wheels instead of being absorbed into the spring when its bobbing up and down? The weight will shift whether the spring is stiff or not wouldn't it? I'm just looking at this in a physics perspective. I have no hands on experience so I'm just wondering my theory would be somewhat correct.

The suspension is shit.

Yes You Will See Weight Shifts No Matter What (thats A Fact Of Physics).... But With Stiffer Springs In The Rear The Rear Tires Are Going To Be Fighting Physics And The Forces Of Momental Gravity Which Will Actually Goes Loss Of Traction And Slower Times.... This Is Why In Drag Racing They Use Softer Spring Rates In The Rear For More Squat And Stiff Front Spring To Keep The Car In The Squating Motion And Prevent Nose Dives While Shifting And Under Heavy Decelleration.

Unfortunatly there is no real happy median between the different springs rates for different kinds of racing. If you enjoy changing out suspension, get some good aftermarket suspension all around, and when you plan on dragging, swap the original springs into the rear. And yes softer springs are better for dragging, but not good for anything else. :banghead:

well i do drift during those occasional drives to work and some on those drag nights lol, and occasional street light drags, i havent taken my car to the track yet, and still have my stock springs all around, and i understand the weight shifting , so the ground control springs are stiffer than just regular lowering springs? My friend got ground control on his integra, i thought it would get all bouncy because he kept his stock shocks and i thought it would be hard over bumps but its actually pretty comfy and handles extremely well... i dont know of anyone who has use regular lowering springs, so i cant compare, because most i know use ground control springs.

Ground Control Springs Can Be Ok Depending Ont He Car But On The 240sx They Are Crap... They Are Extremely Hard So They Bounce Like Rocks And Are Actually Quite Abusive To The Stock Suspension Components.

As For Drifting You Want More Of A Neutral Setup, Road Racing You Want Medium To Stiff Components, Drag Racing You Want Hard Front/soft Rear Springs, And Daily Driving You Want Whatever Is Comfortable To You.

what are some good lowering springs for the 240s? i dont want super stiff, something in teh middle i guess, i dont even know how to tell which are stiff and which are not, what am i looking for?

The Spring Rates Tell How Hard They Are...

Tein S Techs Are Good So Are Eibach Srpings.

The Spring Rates Tell How Hard They Are...

Tein S Techs Are Good So Are Eibach Srpings.

thanks, but whats the mid range spring rate?

Stocks Are Normally Like 150-250lbs (4-6kg) A Good 300-400 (7-9) Spring Rate Would Work Best And Is The Normal Choice For Drifters.

For suspension i would rather get adjustable struts and racing springs, not lowering springs. I want to buy these http://srownersclub.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=HT&Category_Code=STRUT I know a guy who has them on a G20, he is very satisfied and told me some reasons not to buy coilovers. With these struts you can adjust spring rate and all, but not ride hide wich is ok with with me cause I care more about performance then looks.

Stocks Are Normally Like 150-250lbs (4-6kg) A Good 300-400 (7-9) Spring Rate Would Work Best And Is The Normal Choice For Drifters.


dont go over 6kg/mm with a shock spring combo. I belive the konis lose good spring control at 5.5kg.mm.

If you were going coilovers id say get 6-8kg street / autocross and 10-12kg for drift.

OK OK OK >>>here it is my suspention majec numbers (I drift, grip) 6 Kg rear, 8 Front, dampning +3 front. camber -2.5 front. 1/2 tow rear. 225 tiers all around.

BTW there is a reason why $1600 HKS coil over caust as much. but start from ur way up. in the begining i had $80 rs*r srping on stock shocks. build ur way up , trust me. u need to undrestand weight shift, with stiff suspention the weight shift is less obvious. if u don't cntrol the wight, kiss ur ass good by!! plus ur will crash and fuck up the $1000+ suspention.

i added a chart in my original post, hope its helpful to others as well..