DDMotorsports Redline Time Attack Round #2 Results!

ChrisSlicks · 06-04-2009, 08:38 PM

Quote:

Originally Posted by DDMotorsports

I disagree. I think the 2k split is perfect. I was cranking down the front to try and compensate for the understeer from not having enough front camber resulting in not enough contact patch and overheating the outside edge of the front tires.

If you had a stiffer rear that would have helped load the front

M.Bonanni · 06-04-2009, 08:50 PM

Quote:

Originally Posted by ChrisSlicks

If you had a stiffer rear that would have helped load the front

But a good corner exit is the most important part of a turn and I love how this car squats and hooks up once you hit the go pedal on the exit of the corner.

There is still MUCH more development needed on other parts of the car before I start fiddling with spring rates. Like I said, spring wise this car feels awesome.

import111 · 06-04-2009, 09:27 PM

The stiffer you make the rear in comparison to the front, the easier the rear can snap over steer on you...not a good thing unless you are in a drift contest. You want the front as stiff as possible to get sharp turn in and the rear softer for compliance and grip pulling out of corners, like DDMotorsports said about coming out of corners.

ChrisSlicks, where did you find the 370Z spring rates info? The stock rates certainly don't feel like 7.5k/8k F/R at all.

ChrisSlicks · 06-04-2009, 10:01 PM

The stiffer you make the front springs the more understeer on turn in you will get as there will be left weight transfer to the wheel with grip. I haven't had a major problem with snap oversteer, it's pretty progressive when on the throttle. I found the specs somewhere out there, I'll try and find it.

travisjb · 06-04-2009, 11:50 PM

perhaps we're confusing lateral stiffness with spring rates here? let me test my thinking - i'm sure someone will correct me if they see it different...

with 100% stiff front springs but plenty of lateral compliance, should get grip on outside tire on even pavement... assuming lateral stiffness difference front to rear is a non-factor, seems to me that spring rate differences front to rear are more apt to impact things like rates of weight transfer fore/aft and rebound and compression rates... slow weight transfer to front would contribute to understeer, and could result from having relatively less compliance in front due to stiffer spring rate - that part i agree with

06-04-2009, 11:50 PM	#35 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 189	perhaps we're confusing lateral stiffness with spring rates here? let me test my thinking - i'm sure someone will correct me if they see it different... with 100% stiff front springs but plenty of lateral compliance, should get grip on outside tire on even pavement... assuming lateral stiffness difference front to rear is a non-factor, seems to me that spring rate differences front to rear are more apt to impact things like rates of weight transfer fore/aft and rebound and compression rates... slow weight transfer to front would contribute to understeer, and could result from having relatively less compliance in front due to stiffer spring rate - that part i agree with __________________ 2009 370Z #104 For Sale

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06-04-2009, 09:27 PM	#33 (permalink)
import111 Track Member Join Date: Feb 2009 Location: Tucson, AZ. Posts: 622 Drives: 09 Nissan 370Z Rep Power: 192	The stiffer you make the rear in comparison to the front, the easier the rear can snap over steer on you...not a good thing unless you are in a drift contest. You want the front as stiff as possible to get sharp turn in and the rear softer for compliance and grip pulling out of corners, like DDMotorsports said about coming out of corners. ChrisSlicks, where did you find the 370Z spring rates info? The stock rates certainly don't feel like 7.5k/8k F/R at all.

06-04-2009, 10:01 PM	#34 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	The stiffer you make the front springs the more understeer on turn in you will get as there will be left weight transfer to the wheel with grip. I haven't had a major problem with snap oversteer, it's pretty progressive when on the throttle. I found the specs somewhere out there, I'll try and find it.