to start off, I searched for about 30-40 mins but everything I read was from 05-07 and they gave a ton of different answers.

As some of you all know. I got ahold of some 3-way adj. jrz coilovers. Way over my head really but I'm egger to learn. I figured I'd rather buy once and rebuild then buy twice because I wanted somthing "better" after the first season on a lower grade shock.

I'll number by questions and you could copy and past then answer under it. If you so kindly don't mind helping.

1. Any idea where I could find a manual on these shocks? (I look and looked but no luck)


2. What all do I need to buy to fill these? (a kit like this would be nice http://race.off-road.com/dirtbike/news/the...stem-32992.html somthing that came with everything needed since I'm a noob)


3. What pressure should I set them at? (I've read around 185-200 psi (motons) but I saw on jrz's site where they talk about pressures they gave a example using 20 bar which is 290. That seems high)


4. How often does pressure need to be checked/refilled?


5. Whats a good way to test them to see if they need a rebuild when I get them in? (I was thinking, fill them, check for leaks, let them set in my room for a few days and see if the pressure drops. If it does rebuild them)


6. when tuning would you start with everything in the middle or go full stiff and work your way down?


thats all for now. If I think of anything else I'll add it to the list. Thank you very much for anyone willing to share their knowledge with me and I look forward to meeting some of you at nationals next year.

-josh

 

2) High pressure nitrogen cylinder, regulator, nitrogen fill adapter/gauge from a shock manufacturer (allows you to connect a gauge or fill hose with minimal volume of gas lost). Or find a shop that already has that stuff.

3)Should be set by your shock builder to minimize cavitation and hysteresis. There is probably a recommended range. Some people think they can add significantly to the spring rate by using very high nitrogen pressures. I think they're a little crazy.

4) Generally only when you want to change the pressure.

5) Take them off the car and put them on a shock dyno. Gas leak is only one failure mechanism.

6) I started in the middle of the range this time, but it's a good idea to also see what the extremes are like.

 

6. Start at soft for all adjustments. Work your way up with compression first untill your car starts to skip and slide in turns then back off two adjustments. Now your compression is set for that surface. Do the same with rebound.

 

So for number 4. Checking gas pressures and re pressurizing shouldnt be needed unless they leak at Which they need a revalve or I want to change pressures? The guy I got these from mentioned checking them
Every other track day was needed, ect. Wierd.

 

Thanks. I'll do that. I also have a book on chassis setup I plan to read over the winter. It's called vehicle dynamics and damping by Jan zuijdijk.

 

Yeah, good book and if your shocks are tripples there is a section on how tune compression using both high and the low speed adjusters.

 

good offroad and motorcycle shops should be able to check/fill nitrogen for you if you don't want to buy a tank setup. also other local racers with fancy shocks might have nitrogen to share if they're willing.

if i remember the seller's ad correctly (nice buy by the way!) i don't think they have many miles on them. i'd install them for the remainder of this season and drive em.. then determine if they're working well or in need of a rebuild. if you're near the upper limits of the adjusters to get where you want to be, that may be an indication.

just for reference, i run 240psi in my motons and they're performing very well. i haven't checked pressures since i installed them a couple months ago though. they have ~30k miles on them and not rebuilt yet!

 

The guy claimed they only have 5500 miles on them but they are 2 years old. I also found post where he was saying they needed a rebuild over a year ago but he replied to be that he got some wrong info and "thought" they did. But he claims they don't leak or Anthing but I truly won't know till I get them on the 30th. I'll keep this updated.

For the initial pressure I'll get a local shop to fill them but I want to get my own tank also.

 

Mine are at 200psi and I started in the middle for tuning.

 

[QUOTE=josh7owens,Sep 24 2010, 10:26 AM] The guy claimed they only have 5500 miles on them but they are 2 years old. I also found post where he was saying they needed a rebuild over a year ago but he replied to be that he got some