top and bottom cap on the bump spring need to be there, that's what locates it. yeah I guess I probably should go ahead and pull the travel indicator off there. :)
Printable View
You could raise the RF to gain more travel, but the travel gained would just be used up getting to the same C-C in engaging the bump spring (if that makes sense). Just thinking out loud/throwing ideas out there...I now see how the spring "cups" for the bump are machined to the ID of the spring to locate it, so I agree you need one on the top, but what if you removed the one on the bottom and let it sit on the coilover cup? I mean, where's it gonna go? That'd gain you a little more room. Lastly, how does the shock mount to the lower control arm? I assume a shock mount welded to the top of the arm? What if you could modify it to mount "through" the control arm (like on a Gen-X)?
Hopefully you don't have to redesign the car to get where you want to be. I'm sure someone with Rocket experience would have better ideas, or at least know what can and can't be done.
yeah this is just kind of strange, it's not like I'm in some fringe set up here I can't be the first person to run into this.
I had the same sort of issue in my car. I called my manufacturer and ordered a new upper shock mount with a raised pin location for the shock to bolt. Cut the old one off and welded the new one on. Problem solved. My center to center at ride height went from around 18 to 19
In your case, 14.75" and 13.75" loads are the most critical. That is the range you want to race in. Those need to be correct for the info you were given. Load at 17.75 can be changed to make various springs work correctly at 14.75 and 13.75.
You need 600# at ride
850# @ 16.75
1100# @ 15.75
1350# @ 14.75(bump barely touching/ not touching shock)
2100# @ 13.75
A buddy confirmed you should be able to travel 4" with drop spindles setup.
You need to change chassis upper mount, get a shorter shock body, or ditch the bump spring for a shorter, more progressive device like a bump stop.
Or lastly, just run a spring, no bump, and get the correct spring rubbers to ramp the loads at the appropriate travels.
thanks masters .. that's exactly the kind of info I needed. I have a bump stop, will try that with the 200# spring and see if I can hit the 3/4" numbers with that. will also check in to changing upper shock mount.
If you run a bump spring or almost any kind of bump that is a wheel loading setup not a travel limiting setup you are going to have to run the 6” body with the 7” shaft that’s just what rocket does. You can get a different mount but they purpose of the updated mount if two fold it’s for clearance and preload changes for the to fool deck height etc. call a local shock builder you can change over just the body, as long as you have room without knocking shock internals out and it’s not pricey at all.
That 17.75 is just a bad oversight from years ago. The blue gray is a Rayburn front end. Rayburn used 6" front shocks. My chassis builder can't get a car around the track, but at least they got the pin to pin right.
Slightly changing track .. from what I'm getting from Rocket Inc ... it appears there are a few different ways to get to the 3" and 4" load numbers they would like to see. A few different stack combos, single spring, single spring with bump spring, etc.
I'm wondering if the load numbers all land in the same place with these different combos, is there any practical difference in them ?
That's what I been trying to say. Load is load, to a point. There are some differences in progressive vs linear loading and you can get in trouble with abrupt stiffness changes in the wrong travel points. That said, I've had success with lots of different pieces of hardware.
just to update this thread, I called Rocket this morning and they're sending me the parts to give me another 2 in of travel on the right front. I think that should get me where I need to be.
Did they say what the parts are?
Thanks. I figured it had to be more than one thing. I didn't think you'd get 2" out of just the upper shock mount.
Good luck with it!