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Old 09-27-2019, 06:12 PM   #1 (permalink)
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Bouncer coilover questions

Long time reader, first time posting. Building my first bouncer and at the point of ordering coil springs. Have fox 2.0 16” travel on every corner. I’ve ordered my first 2 springs to weigh the rig. Ordered 100 lb viper coils an stuck them on the front. Sits exactly at ride height, with 7.5” of uptravel. I was expecting more squat. The shocks have the factory 200 psi of nitrogen. Thinking of backing that off to around 175 or so. My concern, this is an awfully light spring, this means the rears will need to be super light. Is this common for this rig? Any advice is appreciated. Will try and post pics
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Old 09-27-2019, 06:17 PM   #2 (permalink)
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Dnt look like i can post pics yet
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Old 09-27-2019, 06:32 PM   #3 (permalink)
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If you put on a 100# spring on each side with the shock fully extended, run the adjustment collar down until it just hit the top of the spring, how many inches does each spring compress when you put the rig back on the ground? That measurement plus the spring rate your using will help determine corner weights. From there you can pick your springs accordingly. What are you doing now that is getting you to ride height?

We have no clue what your "bouncer" looks like, has for a drivetrain ect..... How the fuck do you expect us to figure out the answer to your question without details? Its ALL in the details mang.

Last edited by SLOWPOKE693; 09-27-2019 at 06:33 PM.
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Old 09-27-2019, 06:41 PM   #4 (permalink)
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Well if I could get permissions a pic would help a lot. Not my fault bro. Rig has super 60 front sterling 10.5 rear 5.3 ls 4l60e np241. I’m compressing a 16” spring to 12”. So 400 lb corner weight. Seems light to me, just wondering what other full tube chassis are running spring rate wise. My rig looks similar to burkeys riot buggy
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Old 09-27-2019, 06:52 PM   #5 (permalink)
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Other details.... 300 ft of dom tube, 30 lbs welding wire, 17 steelies, traps beadlock rings, smittybuilt winch 10k, psc full hydro steer, art Carr shifter, wilwood brakes, 43 tsl sx non sticky,
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Old 09-27-2019, 07:27 PM   #6 (permalink)
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If you want to go fast and not cavitate your shocks, leave your nitrogen pressure alone.
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Old 09-27-2019, 07:38 PM   #7 (permalink)
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I figure I shouldn’t change the pressure much. Most bouncers run about 180 psi seems like. Guess a light spring is the only way to go. Just wanted some opinions.
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Old 09-27-2019, 07:47 PM   #8 (permalink)
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Is your engine set way back? 400lbs a front corner on a front engine, tube chassis V8 rig seems light to me. I built a Sammi buggy for a guy and I used 125/100 springs on the front with 14" coilovers (5" uptravel & 9" droop) and it drove/wheeled nice. That thing had an aluminum 4cyl, auto trans and a single T-case. No doors or top but it did have a 1.75" cage/tube chassis from front to back. I cant imagine your buggy would be needing the same or less spring than that did.
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Old 09-27-2019, 07:51 PM   #9 (permalink)
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You have access to scales to weigh your rig?

Local truck stop with scales works
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Old 09-27-2019, 07:56 PM   #10 (permalink)
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That’s what I’m thinking. Seems light. The rig is running just yet, new build still have to finish plumbing and wiring. The front pulley is just behind the front axle. The only thing I can think is the resistance in the shocks is throwing my measurements, maybe over pressured or something
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Old 09-27-2019, 07:58 PM   #11 (permalink)
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I’m set up for 7.5 uptravel, or that’s the goal. I have fox 2.5 bumpstops, and without any springs at full bump, it will compress them to within .5” of bottomed out
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Old 09-27-2019, 08:10 PM   #12 (permalink)
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What pressure do you have in the bumps?

*I have no idea how to calculate weight, if even possible based on that number, just strictly curious.
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Old 09-27-2019, 08:15 PM   #13 (permalink)
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I wouldn't order springs until your 100% done with the build. I'm talking fluids, spare parts/tools cooler ect in the rig sitting on bump stops.

Do your spring calculations again and see if that seems more legit.


Any chance your suspension is binding at ride height?
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Old 09-27-2019, 08:16 PM   #14 (permalink)
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I’m not for sure my bump pressure, whatever they come from the factory. Sounds like I need to get a gage and get ready to adjust some pressures. My issue is, I’m sitting perfect on 100 lb springs in the front now, but once I preload them it’s gonna change, or raise the chassis up. These are viper springs from foa, maybe they run heavy?
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Old 09-27-2019, 08:18 PM   #15 (permalink)
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Yea, I may should wait, but I figure I should be good in the front. Completely done up there, and 150 lbs of sand sitting in the rear to accommodate for fuel and coolant.
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Old 09-27-2019, 08:20 PM   #16 (permalink)
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I’m not seeing any binding either. Good easy rotation on the shock heims, shock sitting at 20deg, flexed it up and down, nothing obvious
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