Will over stiff coilover decrease grip on bumpy cornering?

ajai · 11-01-2012, 02:34 PM

Whenever I corner and if the corner is bumpy . The car feel it decrease in grip.
will it because the car is drop low or the coilover damper turn too stiff therefore the car might jump off the road a bit??

ajai · 11-01-2012, 11:52 PM

Please help solve out the problem guys

dwtaylorpdx · 11-01-2012, 11:59 PM

Its not that simple but if you make the springs stiffer in one end of a car that end usually loosens up/slides easier.

Stiff shocks, more tire pressure, different tirs all add up.

Dave

ajai · 11-02-2012, 07:57 AM

Quote:

Originally Posted by dwtaylorpdx

Its not that simple but if you make the springs stiffer in one end of a car that end usually loosens up/slides easier.

Stiff shocks, more tire pressure, different tirs all add up.

Dave

My coilover have 8k springs I believe . Front dampen have been set to 18 hardness. Rear 15. Will that cause problem ?
Also my tire is 28lb front 29lb rear. Dunlop star z1 225/40/18

Is it hard to make a car in air? Since on bumpy road my car jump up...

hummer · 11-02-2012, 11:10 AM

The short answer is yes! When I had PSS9 on full soft there were no issues. When set to full stiff the car, especially in the rear, would bounce around rough corners severly! It appears that your car is very low with very little suspension travel and a very stiff setup. You've created a monster!

ajai · 11-02-2012, 03:35 PM

Quote:

Originally Posted by hummer

The short answer is yes! When I had PSS9 on full soft there were no issues. When set to full stiff the car, especially in the rear, would bounce around rough corners severly! It appears that your car is very low with very little suspension travel and a very stiff setup. You've created a monster!

Thanks for reply! I will try to soften it a bit more to see.
Since when I go through rough corners, sometimes I get bounce and understeer off the apex..

BartenderPlease · 11-02-2012, 04:42 PM

Understeer off the apex? I'm stiff and low but get oversteer out of the apex. Try adjusting your damping to correct for this. I think you want a stiffer rear for oversteer.

TxZHP04 · 11-02-2012, 05:54 PM

There are many factors to consider. I'm running considerably more spring than you in the rear and I have no such problem. In fact, I have less problem with the rear end hopping around over bumpy corners than I did with the stock ZHP setup. Damper capabilities and adjustment make a huge difference as does the overall balance of the car. 8k springs front and rear doesn't sound like an ideal setup to me but there are too may unknowns to be able to resolve your issues. If adjusting the dampers doesn't solve things, you need to find a good local suspension tuner.

11-01-2012, 02:34 PM	#1
ajai Registered User Join Date: Jul 2006 Location: Hong kong Posts: 303 My Ride: 330ci***65104; 328i View My Garage	Will over stiff coilover decrease grip on bumpy cornering? Whenever I corner and if the corner is bumpy . The car feel it decrease in grip. will it because the car is drop low or the coilover damper turn too stiff therefore the car might jump off the road a bit?? __________________ missed the ci, welcome the i

11-01-2012, 11:52 PM	#2
ajai Registered User Join Date: Jul 2006 Location: Hong kong Posts: 303 My Ride: 330ci***65104; 328i View My Garage	Please help solve out the problem guys __________________ missed the ci, welcome the i

11-02-2012, 04:42 PM	#7
BartenderPlease Registered User Join Date: Sep 2006 Location: Charleston Posts: 8,801 My Ride: 328i Sport View My Garage	Understeer off the apex? I'm stiff and low but get oversteer out of the apex. Try adjusting your damping to correct for this. I think you want a stiffer rear for oversteer. __________________ Gottalovethexi: thx for the old p-chopped sig \| BBS CH \| FK coils \| RE Bushings/Mounts \| K&N Intake \| ZHP box/no resonators \| \| 330i brakes \| FX-R + Orion V4 \| Full Exterior LED kit \| JL Audio in trunk \|

11-02-2012, 05:54 PM	#8
TxZHP04 Registered User Join Date: Feb 2006 Location: DFW Posts: 5,732 My Ride: ESS TS2+ ZHP View My Garage	There are many factors to consider. I'm running considerably more spring than you in the rear and I have no such problem. In fact, I have less problem with the rear end hopping around over bumpy corners than I did with the stock ZHP setup. Damper capabilities and adjustment make a huge difference as does the overall balance of the car. 8k springs front and rear doesn't sound like an ideal setup to me but there are too may unknowns to be able to resolve your issues. If adjusting the dampers doesn't solve things, you need to find a good local suspension tuner. __________________ 04 IR 330i ZHP \| ESS TS2+ SC \| MagnaFlow "headers" \| KMS 3.64 LSD \| AST 4100 550/650\| APEX ARC-8 18x9 \| H&R front sway bar \| Vorshlag camber plates, RTAB limiters \| TMS subframe & swaybar reinforcements \| UUC SSK & DSSR \| UUC TM & TME \| BW motor mounts \| Dinan strut & shock tower bars \| vaio 4-bolt oil pump

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11-01-2012, 11:59 PM	#3
dwtaylorpdx Registered User Join Date: Jul 2011 Location: PDX Posts: 201 My Ride: 2005 330xi View My Garage	Its not that simple but if you make the springs stiffer in one end of a car that end usually loosens up/slides easier. Stiff shocks, more tire pressure, different tirs all add up. Dave

11-02-2012, 11:10 AM	#5
hummer Registered User Join Date: Apr 2003 Location: Haverhill, MA Posts: 3,260 My Ride: 2001 330CI View My Garage	The short answer is yes! When I had PSS9 on full soft there were no issues. When set to full stiff the car, especially in the rear, would bounce around rough corners severly! It appears that your car is very low with very little suspension travel and a very stiff setup. You've created a monster!