MY350Z.COM Forums - View Single Post - Should I use early or late springs for NASA TTC?

laze1 · 07-26-2008, 04:56 PM

Should I use early or late REAR springs for NASA TTC?

Ok, so I am now engineering my car to run in NASA Time Trials...that is why I ask.

I am currently running a 2006 Grand Touring w/stock shocks, Hotchkis TVS, and SPL F & R camber arms, w 17x10 wheels and 275-40-17 RA1s . Also, I run my sways bars full soft in the rear, one hole up from full soft in the front. I bought all this stuff for HPDE, but now moving to TT.

But this setup moves me from TTC*(+7 points base) base class to TTB (total of 24 points over base class of TTC). So if I go back to stock springs and 255-40-17 tires I can run TTC...So I have of choice of using the early rear springs or "revised" new rear springs.....not sure which one to run??

I really like the Hotchkis setup, very nice and neutral, with just a hint of oversteer when running the "square wheel/tires" setup, very little understeer with the stock 18/19 wheel combo...and I would like to keep that.

So should I use the early springs? (still using the Hotchkis sway bars and square setup)

Oem springs 350Z’s 2003/2004
Front:314 Rear:342

Oem springs 350Z 2004.5/2005 (this is what come on the car new)
Front:314 Rear:427

Hotchkis Linear springs .6”/.8” drop (this is what is on the car today)
Front: 340 Rear 330
Stiffer or softer then oem springs by F+8% R-3% (relative to the early version spring rate)

07-26-2008, 04:56 PM	#1
laze1 Regular Join Date: Jul 2007 Location: Atlanta GA Posts: 380 iTrader: (7)	Should I use early or late springs for NASA TTC? Should I use early or late REAR springs for NASA TTC? Ok, so I am now engineering my car to run in NASA Time Trials...that is why I ask. I am currently running a 2006 Grand Touring w/stock shocks, Hotchkis TVS, and SPL F & R camber arms, w 17x10 wheels and 275-40-17 RA1s . Also, I run my sways bars full soft in the rear, one hole up from full soft in the front. I bought all this stuff for HPDE, but now moving to TT. But this setup moves me from TTC(+7 points base) base class to TTB (total of 24 points over base class of TTC). So if I go back to stock springs and 255-40-17 tires I can run TTC...So I have of choice of using the early rear springs or "revised" new rear springs.....not sure which one to run?? I really like the Hotchkis setup, very nice and neutral, with just a hint of oversteer when running the "square wheel/tires" setup, very little understeer with the stock 18/19 wheel combo...and I would like to keep that. So should I use the early springs? (still using the Hotchkis sway bars and square setup) Oem springs 350Z’s 2003/2004 Front:314 Rear:342* Oem springs 350Z 2004.5/2005 (this is what come on the car new) Front:314 Rear:427 Hotchkis Linear springs .6”/.8” drop (this is what is on the car today) Front: 340 Rear 330 Stiffer or softer then oem springs by F+8% R-3% (relative to the early version spring rate) __________________ HPDE Grad - TT noob Last edited by laze1; 07-26-2008 at 06:14 PM.