Announcement

Collapse

Session time has been extended...

Instead of 30 minutes, you will be logged into s14.net for 1.5 hours of inactivity before being logged-out. Also instead of having only 30 minutes to edit a post, it has now been extended to 60 minutes.
See more
See less

J STOCK springs are BACK!!!!!!!!!

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • mwagner10702
    replied
    Perfect example of why you don't re-invent the wheel when all the real parts are readily available. Springs are the incorrect length, dampers incorrectly valved. Complete waste of money IMO.

    Leave a comment:


  • RAD2LTR
    replied
    I'm guessing your compression damping is too stiff, and the rebound is a little on the light side. If you back the compression damping off, that will allow the springs to do more work without the dampers trying to keep them from compressing. On the other end, if you don't have enough damping on the rebound, the back end is going to bounce.

    Will

    Leave a comment:


  • kevnj
    commented on 's reply
    Thanks for the feedback Redneckvtek. The technician did a conversion to inch pounds from the rates Will shared. Wonder if there was a disconnect in the conversion.

    Looking at my rear shocks at rest installed there isn’t allot of travel available and I’d like to lower it another 1/2 inch ideally with some room to spare for corner balance if. I’ll snap some pics and share later.

  • redneckvtek
    replied
    Looks like your dampers are too stiff. Definitely in compression. I canít really see which ones are front and which are rear on my phone, but the compression numbers seem very high specifically. The ones not starting at zero are odd too - thatís preload I guess?

    Bilsteins numbers are at 20.5 in/sec, but your chart only goes to 10 in/s and your damping is much higher than the numbers that were posted before.

    1250 Newtonís is 281 pounds, which is where the force should be at 20 in/s. Yours are past that at 10 in/s.
    Attached Files

    Leave a comment:


  • kevnj
    replied
    Thanks mwagner10702. Had a great weekend at Summit. Overall the car felt great. Immediate turn in, with a very neutral car.

    Only issue I am having now is on sweeping turns greater then 90' degrees, the rear of the car is bouncing when approaching the traction limits on bumpy tarmac running Hankook 214s. When I backed off a smidge it was fine. I'm running full length Bilstein sports so thinking the dampener maybe too compressed and it's not working in the sweet spot. We also thought possibly the trailing arm was moving so much that the spring was not under constant tension but looking at pictures of the car through the corner it looks like the tire was pretty loaded and there was minimal lean Also want to get the car lower.......Ride height is about 5.5-5.75 inches from the front pinch weld. Looking to get closer to 5.

    Here's the shock dyno for the re-valved dampeners if anyone can comment or knows how to read this.
    Click image for larger version  Name:	Dyno_Plot.JPG Views:	0 Size:	68.0 KB ID:	1281099

    Leave a comment:


  • mwagner10702
    replied
    Originally posted by kevnj View Post
    Can someone measure the J stock springs Front and Rear? Curios what length they are when they are not under load....
    Front is 8"
    Rear is 7"

    FRONT:

    Click image for larger version  Name:	Front.jpg Views:	0 Size:	197.0 KB ID:	1281030

    REAR:

    Click image for larger version  Name:	Rear1.jpg Views:	0 Size:	196.3 KB ID:	1281031

    Click image for larger version  Name:	Rear2.jpg Views:	0 Size:	172.4 KB ID:	1281032

    Leave a comment:


  • kevnj
    replied
    Originally posted by mlytle View Post
    See you at Summit!
    it is going to be a little warm...100deg...


    Instructor group #122
    Red 2002 with S14.
    Awesome, Iím running pit-out so Iíll have to make sure and get out so we can run a session or two together.

    Love your car, have seen you run before. Iím driving a Non M Orange E30.

    Leave a comment:


  • jimmy p.
    replied
    I'll be there as well! Marshall I just heard you were going.
    Silver E30M3 (also with S14 LOL)
    Instructor Group #130

    Leave a comment:


  • mlytle
    replied
    See you at Summit!
    it is going to be a little warm...100deg...


    Instructor group #122
    Red 2002 with S14.

    Leave a comment:


  • kevnj
    replied
    Update on the Ground Control J Stock Replica project.

    RE suspension is awesome to work with. They rebuilt and re-valved my Billy Sport dampeners and turned them back to me in a few days, very good service. I ended up going with a 6 inch, 700lb spring up front and 1000, 5 inch in the rear. This has increased my ride height by almost an inch and my adjusters are pretty much maxed out. Now evaluating getting shorter springs.

    Can someone measure the J stock springs Front and Rear? Curios what length they are when they are not under load....

    Will be running my car at Summit Point this weekend, going to put some zip ties on the dampers and springs to see how much compression I'm getting and if coil bind is an issue with these high rates.

    Leave a comment:


  • redneckvtek
    replied
    Originally posted by irdave View Post
    RE Suspension, as in Roehrig Engineering? Yeah, probably fine to send your stuff there. PSI out in Sonoma is for sure legit; so is Roehrig.
    Not exactly, but Roehrig engineering is mentioned on their "About us" blurb.

    https://www.resuspension.com/


    Per RE, another good option is the AK1198 shock, which is designed for 4cyl mini-stocks. Its about $160 with any valving desired, has a 10mm shaft, a 5/8 lower hole (close enough to 12mm), and is slightly shorter than the B8/Econolines. I think that is what I am going with, just debating what rates to go with now based on my car's weight and balance.

    Leave a comment:


  • redneckvtek
    replied
    Originally posted by Ant's m3 View Post

    So in short so far it is possible to send in B8 Front and rear dampers (i know non inverted rears but what are our choices) to RE Suspenion and get them revalved for these springs?

    Only if you have and older set of B8 rear dampers. You will need to confirm that they are serviceable (look for a lack of "crimp" marks on the body, as showin in the picture posted previously in this thread)

    I am not sure on the front, I believe those are still serviceable. I ended up buying the pre-valved 300/175 J-stock dampers from Turner.

    Leave a comment:


  • irdave
    replied
    RE Suspension, as in Roehrig Engineering? Yeah, probably fine to send your stuff there. PSI out in Sonoma is for sure legit; so is Roehrig.

    Leave a comment:


  • Ant's m3
    replied
    For sure those are viable options, however in my case I have a set of brand new B8 fronts sitting in the box and was thinking I could send in my current rear set as well. I will have to confirm on that $75 ea price. RE suspensions are pretty well known here on the east coast

    :thumbsup: on your quick response!

    Leave a comment:


  • mwagner10702
    replied
    Originally posted by Ant's m3 View Post

    So in short so far it is possible to send in B8 Front and rear dampers (i know non inverted rears but what are our choices) to RE Suspenion and get them revalved for these springs?
    Make sure you calculate the complete price for a set of revalved dampers (i.e. acquisition costs + revalve costs). As I mentioned in previous threads, I priced it out and concluded that it was better to go with the already modified fronts from Turner (https://www.turnermotorsport.com/p-3...ront-bilstein/) and the Group N Motorsport Bilstein rears from Bilstein UK (https://www.bilstein-shocks.co.uk/products/24-000642). If you want the front Group N Motorsport damper (300/300 valving) that is also available from Bilstein UK (https://www.bilstein-shocks.co.uk/products/34-046296).

    If RESuspensions can revalve for $75 each - that's a bargain. I think that's underpriced. PSI out of Sonoma quoted me $250 each for the front struts and $200 each for the rears (standard B8 dampers). Perhaps they are on the high end, but they are the go-to place for many race teams.

    Leave a comment:

Working...
X