Spring rate help?

wstar · 08-12-2014, 11:51 AM

Yeah, actually another local forum member here was going to sell me his stock rear bar, but I dropped the ball and forgot to follow up because right after that my engine blew up and everything else went on hold while I dealt with that

Maybe I'll try that first and see how it goes next event (and up my dampers a bit too). And then work on upping the spring rates a little later and see how they pan out with different tires and in the wet, perhaps start at something like ~900 and ~800 lbs/in, or whatever values in that ballpark I can locate in matching springs.

Thanks for the input guys

clintfocus · 08-12-2014, 12:44 PM

Quote:

Originally Posted by wstar

Yeah, actually another local forum member here was going to sell me his stock rear bar, but I dropped the ball and forgot to follow up because right after that my engine blew up and everything else went on hold while I dealt with that

Maybe I'll try that first and see how it goes next event (and up my dampers a bit too). And then work on upping the spring rates a little later and see how they pan out with different tires and in the wet, perhaps start at something like ~900 and ~800 lbs/in, or whatever values in that ballpark I can locate in matching springs.

Thanks for the input guys

Yeah going back to stock rear bar would be the first thing I try. Its cost effective and I know for sure a track Z shouldn't have that bar back there lol

Shamu · 08-12-2014, 01:05 PM

I run 1000 lb fronts and 550 lb rears and thats not enough spring for slicks. You are way undersprung upfront. low front spring rate allowing rear to lift like that.

We are going to 1100 front and 700 rear maybe more! I drove on streets for couple years with 1000 lb springs and JRZ coilovers. Was downright comfy.

synolimit · 08-12-2014, 01:51 PM

Quote:

Originally Posted by Shamu

I run 1000 lb fronts and 550 lb rears and thats not enough spring for slicks. You are way undersprung upfront. low front spring rate allowing rear to lift like that.

We are going to 1100 front and 700 rear maybe more! I drove on streets for couple years with 1000 lb springs and JRZ coilovers. Was downright comfy.

Really? I'm DDing my new 2 ways that just came in, 1000 fronts and 670 rears

I'll figure out tomorrow I guess.

GSS138 · 08-12-2014, 02:09 PM

Would agree with all the above. The rates are low. In the pic, the front right is rolling over(as is probably the rear), and the rear sway is lifting the rear left.

Clint's suggestion is definitely the fastest, least expensive change though. Long term I would look at something more like 16kF/10KR if you otherwise like your current setup.

08-12-2014, 11:51 AM	#1 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	Yeah, actually another local forum member here was going to sell me his stock rear bar, but I dropped the ball and forgot to follow up because right after that my engine blew up and everything else went on hold while I dealt with that Maybe I'll try that first and see how it goes next event (and up my dampers a bit too). And then work on upping the spring rates a little later and see how they pan out with different tires and in the wet, perhaps start at something like ~900 and ~800 lbs/in, or whatever values in that ballpark I can locate in matching springs. Thanks for the input guys __________________ 7AT Track Car! Journal thread / Car setup details

08-12-2014, 01:05 PM	#3 (permalink)
Shamu A True Z Fanatic Join Date: Jan 2011 Location: Nor Cal Posts: 1,059 Drives: 370Z Racecar Rep Power: 21	I run 1000 lb fronts and 550 lb rears and thats not enough spring for slicks. You are way undersprung upfront. low front spring rate allowing rear to lift like that. We are going to 1100 front and 700 rear maybe more! I drove on streets for couple years with 1000 lb springs and JRZ coilovers. Was downright comfy. synolimit likes this. __________________ Grant Last edited by Shamu; 08-12-2014 at 01:11 PM.

08-12-2014, 02:09 PM	#5 (permalink)
GSS138 Track Member Join Date: Mar 2013 Location: Mission Viejo, CA Posts: 769 Drives: '12 370Z 6M Sport Rep Power: 15	Would agree with all the above. The rates are low. In the pic, the front right is rolling over(as is probably the rear), and the rear sway is lifting the rear left. Clint's suggestion is definitely the fastest, least expensive change though. Long term I would look at something more like 16kF/10KR if you otherwise like your current setup. __________________ Current Mods: Vorpal Weapon +5.

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