New Monospring Bottoms Out
Thread Starter
Instructor
Joined: Jan 2007
Posts: 152
Likes: 0
New Monospring Bottoms Out
I installed a new 330 lb VB&P Rear Monospring on my 79 (small block). If I drive over a dip in the road at highway speed, the rear end bottoms out. I wasn't sure at first, but then I filled the tank and had a passenger in the car and the car bottomed out much more noticeably this time. I do not have the Bilstein shocks, just some standard issue shocks that were replaced about 2 years ago. The car never bottomed out with the old style steel spring. So waddaya think?
Melting Slicks
Joined: Dec 2004
Posts: 2,161
Likes: 0
From: pr, frederick md.
but shocks wont help much with bottoming out. shocks only control the springs movements, and wont help much with adding strength to the spring
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Pro
Joined: Apr 2006
Posts: 647
Likes: 22
From: Norwalk CT and Boynton Beach FL
I installed a new 330 lb VB&P Rear Monospring on my 79 (small block). If I drive over a dip in the road at highway speed, the rear end bottoms out. I wasn't sure at first, but then I filled the tank and had a passenger in the car and the car bottomed out much more noticeably this time. I do not have the Bilstein shocks, just some standard issue shocks that were replaced about 2 years ago. The car never bottomed out with the old style steel spring. So waddaya think?
Racer
Joined: Nov 2006
Posts: 264
Likes: 0
From: McLouth Kansas
I ordered a 330 spring from VBP and I got the KYB shocks that are valved for the mono spring,,,,I have not driven it enuf to tell if I have that problem but what I have driven I notice no inkling to botteming out.
When I ordered the spring they went thru the 330 springs and picked me out a heavier rated spring in the 330 range. I wanted something that was performance minded but not a harsh riding spring either.
When I ordered the spring they went thru the 330 springs and picked me out a heavier rated spring in the 330 range. I wanted something that was performance minded but not a harsh riding spring either.
Thread Starter
Instructor
Joined: Jan 2007
Posts: 152
Likes: 0
I replaced my rear spring with the same VB&P Monospring this past fall and had the SAME problem. If I had it to do over, I would have gone with the next stiffer rear spring and the Bilsteins. I crawled under the car to see where it was bottoming and it was hitting on the threads of an exhaust U clamp. So I turned the U clamps so the threads were all facing up (this gave me about another half inch), I put more air in the tires to 30 lbs and I raised the rear of the car by 1/2 inch. Seems to have solved the problem. I'll know more in the spring when I start driving the car again. Try that stuff.
Thanks for the suggestions, and it's also good to know that I am not the ONLY one experiencing this problem. Did you try contacting VB&P about your problem with the monospring? I e-mailed them yesterday but haven't heard back from them yet.
Pro
Joined: Apr 2006
Posts: 647
Likes: 22
From: Norwalk CT and Boynton Beach FL
I did contact them and they did offer to swap the 330 mono for a stronger one ---- but who wants to do that job over again? I'll live with it ---- it's only a "nice day" car and i drive it less than 2K miles per year. It's been my experience that every time I don't replace a part in my C3 with the exact original equptment, I end up doing the job two and three times over before it comes out right. Just my 2 cents
