Jrz rs pro for track

martin82

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

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.

travisjb

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*

03threefiftyz

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

travisjb

multilink, yes on big bar

__________________
2009 370Z #104
*For Sale*

03threefiftyz

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

clintfocus

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

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

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

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

clintfocus

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.

Dwnshift

We run a much larger split on rates...large front bar.. Small rear bar(in comparison to the front)

03threefiftyz

The split on spring rates seems awful narrow considering it's in true coil-over. Especially with a big rear bar.

Dwnshift

Agree
Just my two cents
we use a 245 front tire... So with a larger front contact patch.. I would seriously reconsider those rates.

clintfocus

when you guys say larger split, Larger higher front rate, or softer rear rate?

I was trying to ease the transition from Martin's mediocre coilover at 10k front 8 k rear. He also has changed alot of bushings, alignment arms etc. Getting him off the stiff rear whiteline bar, off the bump stops, and on a good damper i feel is step one. i dont want to throw too many changes at him at once.

Dwnshift, after testing and speaking with you i like the large front bar on the 370, im leaning on Martin to try the same, but i want to get somewhat of a baseline with these rates.