Jrz rs pro for track

martin82 · 08-04-2013, 12:25 PM

How many people run the jrz rs pro? Do you have install pics? I am trying to decide if I need the quick connects to mount the reservoirs so I don't need to get under the car to adjust both settings.

Would like to see pics installed as well if you have them and ideas of spring rates.

Speaking w clintfocus I am going to order two sets probably. 13k front and 10k rear and 14k front and 11k rear thoughts?

Currently run 285/35/18 rs3, would later like to run nt01 and td plus add full aero.

03threefiftyz · 08-04-2013, 07:28 PM

Trust me. Get the quick disconnects. It will make your life easier. Spring rates sound fine (albeit on the soft side IMO), but you are definitely going to want more spring once aero and R-comps come into play. I run just under 18k front and 15.2k rear (1000/850lb) on my autocross car. Not apples to apples since I use very large A6's and have aero. I also don't use a rear sway bar.

synolimit · 09-05-2013, 08:08 PM

Quote:

Originally Posted by 03threefiftyz

Trust me. Get the quick disconnects. It will make your life easier. Spring rates sound fine (albeit on the soft side IMO), but you are definitely going to want more spring once aero and R-comps come into play. I run just under 18k front and 15.2k rear (1000/850lb) on my autocross car. Not apples to apples since I use very large A6's and have aero. I also don't use a rear sway bar.

Off topic, how do you convert kg to lb? Cause it sure as hell isn't the correct mathematical way.

ChrisSlicks · 09-06-2013, 06:53 AM

Quote:

Originally Posted by synolimit

Off topic, how do you convert kg to lb? Cause it sure as hell isn't the correct mathematical way.

Sure it is.

2.204 lbs per kg x 25.4 mm per inch = 55.9974146

synolimit · 09-06-2013, 10:47 AM

Quote:

Originally Posted by ChrisSlicks

Sure it is.

2.204 lbs per kg x 25.4 mm per inch = 55.9974146

Lol times 25.4 is not kg to lbs. that's adding anothe factor, little more in depth. Where's the per inch part found or is it 25.4 and that's it? Stock front is like 8.5x2.2x25.4= 474lbs?

ChrisSlicks · 09-06-2013, 02:03 PM

Quote:

Originally Posted by synolimit

Lol times 25.4 is not kg to lbs. that's adding anothe factor, little more in depth. Where's the per inch part found or is it 25.4 and that's it? Stock front is like 8.5x2.2x25.4= 474lbs?

You are converting from kg/mm (kilograms per millimeter) to lbs/in (pounds per inch), the 2 values are the conversion factors for converting kg to lbs (2.204) and mm to inches (25.4). Multiply the 2 together and you get the total conversion factor (55.9974) or you can apply each individually.

e.g. 8.5 kg/mm x 2.204 x 25.4 = 476 lbs/in
or 8.5kg/mm x 55.9974 = 476 lbs/in

travisjb · 08-04-2013, 07:41 PM

not using JRZ's (*jealous*) but I run 18/10k and happy with that. if you have an option for quick changeout of springs, that's prob worth it. how much $?

03threefiftyz · 08-04-2013, 08:04 PM

I'm betting the 10k rear is in coilover....correct? If not, I hope you run a ton of rear bar.

travisjb · 08-04-2013, 08:11 PM

multilink, yes on big bar

03threefiftyz · 08-04-2013, 08:28 PM

I know it's a multi-link, but is the spring on the shock or in the OEM location?

clintfocus · 08-04-2013, 10:06 PM

Martin's setup is going to be true coilover in the rear, so the spring rate will be closer to the actual number then in the stock location where its "effectively softer".

I recommended the rates to martin as a starting point, but take into account the socal tracks we run are on the bumper/rough side, so compliance is key.

cv129 · 08-04-2013, 11:25 PM

Sorry being a little off topic here...for you track guys running true type coilovers in the back, have you thought about reinforcing the rear towers? (seems to be somewhat a problem in the E36 3 series)

clintfocus · 08-05-2013, 02:40 AM

Quote:

Originally Posted by cv129

Sorry being a little off topic here...for you track guys running true type coilovers in the back, have you thought about reinforcing the rear towers? (seems to be somewhat a problem in the E36 3 series)

this is something ive discussed with Martin since its true that the damper towers were not designed for the load of the spring. With his future custom roll bar plans this should be addressed.

wstar · 08-05-2013, 02:58 AM

How much reinforcement are we talking? Would just the usual endplates on a normal cage setup be sufficient, or do you mean reinforcing all around the top?

FWIW I'm using the JRZ RS1 package that Forged put together (which is JRZ's entry-level - single-adjust without external reservoirs, but they are true coilovers in the rear). Forged's spring setup on those is 11.5k + 9k. Feels pretty nice to me, but the car is still very much at a street level of setup (in that most of the rest of the suspension is stock, and I'm on high-treadwear street tires and no aero mods). I'm guessing I'll ramp up the spring rates later as I add other stuff to match. I run the Hotchkis sways too, lately using the stiffest setting in the rear (but I'd probably back that off a notch or two if I wasn't losing front grip to camber issues...).

clintfocus · 08-05-2013, 03:27 AM

Quote:

Originally Posted by wstar

How much reinforcement are we talking? Would just the usual endplates on a normal cage setup be sufficient, or do you mean reinforcing all around the top?

FWIW I'm using the JRZ RS1 package that Forged put together (which is JRZ's entry-level - single-adjust without external reservoirs, but they are true coilovers in the rear). Forged's spring setup on those is 11.5k + 9k. Feels pretty nice to me, but the car is still very much at a street level of setup (in that most of the rest of the suspension is stock, and I'm on high-treadwear street tires and no aero mods). I'm guessing I'll ramp up the spring rates later as I add other stuff to match. I run the Hotchkis sways too, lately using the stiffest setting in the rear (but I'd probably back that off a notch or two if I wasn't losing front grip to camber issues...).

reinforcement detail is something best decided by a experience chassis fabricator, which is what im going to do when i look to do such modification myself. Martin is most likely going to go to my guy for the same safety mods and possible rear tower strengthening .

Yeah i recommended the rates to try and get martin back onto his stock rear bar, but to also prep for a rear wing, and 100ish treadware R comps. The high(ish) front rates are to hlep compliment Martin's square setup (18x10.5/285) and the smallish front whiteline sway bar. The 13-14k front ate should work well with Martin's cornering force, and the 370s front weight bias, also the VQ37 motor has some what of a high CG.

08-04-2013, 12:25 PM	#1 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 20	Jrz rs pro for track How many people run the jrz rs pro? Do you have install pics? I am trying to decide if I need the quick connects to mount the reservoirs so I don't need to get under the car to adjust both settings. Would like to see pics installed as well if you have them and ideas of spring rates. Speaking w clintfocus I am going to order two sets probably. 13k front and 10k rear and 14k front and 11k rear thoughts? Currently run 285/35/18 rs3, would later like to run nt01 and td plus add full aero. Last edited by martin82; 08-04-2013 at 04:27 PM.

08-04-2013, 07:41 PM	#7 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 189	not using JRZ's (jealous) but I run 18/10k and happy with that. if you have an option for quick changeout of springs, that's prob worth it. how much $? __________________ 2009 370Z #104 For Sale

08-04-2013, 08:11 PM	#9 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 189	multilink, yes on big bar __________________ 2009 370Z #104 For Sale

08-05-2013, 02:58 AM	#14 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3595	How much reinforcement are we talking? Would just the usual endplates on a normal cage setup be sufficient, or do you mean reinforcing all around the top? FWIW I'm using the JRZ RS1 package that Forged put together (which is JRZ's entry-level - single-adjust without external reservoirs, but they are true coilovers in the rear). Forged's spring setup on those is 11.5k + 9k. Feels pretty nice to me, but the car is still very much at a street level of setup (in that most of the rest of the suspension is stock, and I'm on high-treadwear street tires and no aero mods). I'm guessing I'll ramp up the spring rates later as I add other stuff to match. I run the Hotchkis sways too, lately using the stiffest setting in the rear (but I'd probably back that off a notch or two if I wasn't losing front grip to camber issues...). __________________ 7AT Track Car! Journal thread / Car setup details

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08-04-2013, 07:28 PM	#2 (permalink)
03threefiftyz Track Member Join Date: Apr 2010 Location: MD Posts: 536 Drives: 03 350z 6mt Rep Power: 16	Trust me. Get the quick disconnects. It will make your life easier. Spring rates sound fine (albeit on the soft side IMO), but you are definitely going to want more spring once aero and R-comps come into play. I run just under 18k front and 15.2k rear (1000/850lb) on my autocross car. Not apples to apples since I use very large A6's and have aero. I also don't use a rear sway bar.

08-04-2013, 08:04 PM	#8 (permalink)
03threefiftyz Track Member Join Date: Apr 2010 Location: MD Posts: 536 Drives: 03 350z 6mt Rep Power: 16	I'm betting the 10k rear is in coilover....correct? If not, I hope you run a ton of rear bar.

08-04-2013, 08:28 PM	#10 (permalink)
03threefiftyz Track Member Join Date: Apr 2010 Location: MD Posts: 536 Drives: 03 350z 6mt Rep Power: 16	I know it's a multi-link, but is the spring on the shock or in the OEM location?

08-04-2013, 10:06 PM	#11 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 39 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 16	Martin's setup is going to be true coilover in the rear, so the spring rate will be closer to the actual number then in the stock location where its "effectively softer". I recommended the rates to martin as a starting point, but take into account the socal tracks we run are on the bumper/rough side, so compliance is key.

08-04-2013, 11:25 PM	#12 (permalink)
cv129 A True Z Fanatic Join Date: Jul 2011 Location: Dallas, TX Posts: 3,252 Drives: 09 Nismo, 16 Nismo Rep Power: 163995	Sorry being a little off topic here...for you track guys running true type coilovers in the back, have you thought about reinforcing the rear towers? (seems to be somewhat a problem in the E36 3 series)