Has anyone ever used the VBP adjustable front spring? They don't give much tech info. I was wondering if you can lower the front of car with this and if so how much. Does raising and lowering change spring pressure? Or can all you do with it is adjust spring pressure? If you know please chime in. This will be my winter project lowering "lowering my ride" My magnesium wheels just got powder coated a flat black and they will go on also

 

I'm running VB&P's Extreme front spring and I'm very happy with it. It's basically a stock-style transverse spring with a threaded insert on either end. It comes with your choice of small/medium/large adjusters depending on how low you want to bring down the front end.

The "adjusters", are basically just a pair of threaded rods that "screw-in" to the threaded insert on the spring from the bottom. The difference between the small/medium/large adjusters is the size of the "****" at the ends of the threaded rods. (**** probaby isn't the correct term but that's what I'm calling them )

The small adjuster will allow for maximum lowering. The large will allow for more ride height. Once the threaded rod screws into the spring, you adjust them by turning them clockwise/counter clockwise with an allen key. Make sure the front wheels are off the floor also, to take the pressure off the suspension, otherwise it'll be too difficult to turn the adjusters. Take the time to coat the threads with some anti-sieze compound as well. It helps.

I originally went with a "medium" adjuster and later discovered that the front end sat way too low, even when adjusted for maximum height. The top of my tires were literally INSIDE the front fenders.

I ended up ordering a pair of their "large" adjusters and I way able to raise the car about 3/4" so now the top of my tires sits flush with the fender line. Still lower than 99% of the C4's I've seen, but high enough to still be driven on normal roads...

My spring rate is 950# by the way. You can order them as high as 1200. It all depends on your combination and what you want out of your spring.

For pictures of the spring itself, see the links in my signature for suspension upgrades. Hope that helps.

 

Good info! What # spring did yours come with stock? How did the 950# spring and lower stance effect your ride quality? Do you know what it measures from the ground to the center of the wheel well?

I assume you lowered the back also? I was going to just use the bolt kit. If you used longer bolts what length did you use?

Thanks for all the info and sorry for so many questions. Your vette stance is a little hard to see in your pics.

 

The front spring rate on my '92 I believe was in the area of about 417lbs/in (suspension RPO: FX3) so the VB&P spring had/has a much more aggressive spring rate than the original. As far as how much the ride quality was affected by the new spring rate, I can't say for sure. I didn't just upgrade the spring by itself, but chose to upgrade the ENTIRE suspension system all at once. It's a completely different car now - but like I said, how much influence did the stiffer spring have on ride quality by itself, I couldn't tell you. Sorry.

Bear in mind that I'm running adjustable shocks as well, so even with the suspension components I'm running now (stiffer springs/rod ends/Del-A-Lum bushings etc. etc.) - the ride quality can be controlled via the QA1 shocks from mild to wild. This makes it difficult to comment on how much the ride quality is affected by individual upgrades since ride quality itself can be adjusted via the shocks...

As for the front ride height, I just went out and measured the distance from the floor to the fender and it comes in at 25 1/4". That's the HIGHEST I can get the front end with the "large" size adjusters. Still low, so I just have to be careful entering/exiting parking lots and driveways with steep curves. So far so good.

As for the rear, I have both 10 and 12 inch bolts from VB&P. The 10" bolts didn't quite lower the rear as much as I wanted but the 12" bolts, unfortunately, aren't threaded high enough on the bolt so the larger 12" bolts actually lower the rear too much for my liking. If only they were threaded a bit higher up the bolt, I'd be able to raise the back end a little more but I can't.

I went back to the 10" bolts instead. I'd still like to bring the rear down another 1/4-1/2" so what I might do is remove the shims on the rear spring mounts. That may be enough to get the extra 1/4" or so.

I will try and get some pictures tomorrow of the car as it sits now. I've been wanting to upgrade my old suspension threads with updated pictures of the car's new stance but something always comes up and I never have the time.

Hopefully tomorrow the sun will be shining and I'll geta chance.

 

Great! thanks so much. You may be able to use a Die and chase more threads on your 12" bolts. That would be the easy way. I also know guy's have bought allthread and welded a nut on one end to get use of the entire lenght.

 

Everything LT1*C4 said is correct.

I also have this spring 1074# and tried all the adjusters and went with the largest size.

The rear spring is 411# (I originally tried a 488# rear spring).

The ride is stiffer than stock-but not to bad to drive on the street.

Good luck,
Steve

 

You guys running the VBP monospring, Are your monospring bending backwards/upwards? Ive noticed Betty Boops Sport monospring is a bit in an arch towards the sky and that was not like that. It is only three years old and not even 20,000 miles.

 

Is there a way to visually tell which VBP springs are which? I bought a '92 roller with front/rear VBP springs and just wondering what their spec are.

 

Is anyone running the hyperco front spring? Do they ride as soft or softer then OEM and do they have a lowering option?

 

Yes-It will bend up as the spring is straight.

Should be stated on the spring (hand written)

 

Just had the VB&P Front Adjustable and rear spring installed. I think we went @1100# front and @800# on the rear. I mainly got mine specifically for autox and I do have 32mm front and 26mm rear anti-roll bars. I went over to take a look at the car since the springs were changed and it is low. Can't wait till next spring to see how much better the car will handle.

 

Which adjustment setup did you use? High, medium or low?

 

has your ride height lowered since originally installed? Thinking about doing the same upgrade, many thanks, bob

 

The front ends changed in '88 & last time I checked the VBP adjustable spring won't work in our '87s, d'oh!

 

Yes, it did about 1/2".

 

thats excellent info, many thanks

 

Honestly, I don't know. My tuner sets up the suspension and ordered the springs. He did tell me what the approximate rates were and I was a little hesitant to go with the high spring rates he went with until I had to make a decision on whether to stay in the run group I was in or move up. So, I decided to move up and went ahead with the higher rates. For perspective, the Corvette Challenge rates were around 621# front and 327# rear.

What I would suggest is, before you purchase, make sure you know what your intented use is for the car. If you are only interested in lowering, you can just use the front wedges which you can purchase for probably less than $100 and longer bolts for the rear.

I tried to place a pict of the new ride height on this thread, but was unsucessful. But, the pict is in my l98tpi album under my photos if you want to get an idea how it sits now. As well for reference the yellow C5 on the other side of mine sets lower than stock C5.