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Question about safety of my lowered springs

Skysthelimit
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Skysthelimit Contributor

Skysthelimit

Posted
Posted

hey,

i bought myself some used lowered front suspension, off a half cut: unknown lowered springs and KYB shocks.

When i had it put on my car, i just went to a average mechanic, seemed he didnt know alot about sports cars.

Anyways when we got the supsension all put on, he was worried about the safety of it all. Because while jacked up in the air, and with the shocks hanging down, the springs just sat about half way up them, so there was a gap (if ya get what i mean, between the top of the springs and the top strut bit).

As he didnt work with sports cars, he said on normal everyday cars, that shouldnt be the case, he said that the springs should always have contact with the struts when they are fully extended.

I am really happy with the hight, makes my front bar exactly 100mm from the ground. So i was wondering if there were any safety probs with this? Maybe if i went over a big hump or something, is there a safety prob with maybe the springs not sitting right on landing?

cheers for any help or advice you can give me :(

STL

Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi Sky, springs should at all times be incontact with the seats, firstly it is illegal for them not to be. Secondly whenever you jack the car up the springs may fall off the spring seat, when you let it down they may not line up. This means you can have the spring hanging out, hit the tyre, rip it to pieces or bind the steering. It is a pretty slim chance that you would have a bump large enough to bounce the car up far enough and for long enough for the springs to jump out, but I have seen it happen.

This is one reason why progressive springs are used, so you can have the car low enough because the soft initial rate compresses easily with the weight. Then the harder rate actually does the work of absorbing suspension movements.

I strongly suggest you have a read here

www.whiteline.com.au

There are some interesting articles on Skyline suspension, heights and spring rates. They have agents in WA.

Hope that helps

red900ss Grand Master

red900ss

Posted
Posted

Are they just standard springs that have been cut down? If so you will bottom out, hit the bump stops and bounce off the road. If you happen to run into someone else you will be in deep shit as the accident investigation units are not fools and will discover this in no time.

Your insurance won't cover you and the cops will throw the book at you.

Sounds harsh but that's life. :P

Skysthelimit Contributor

Skysthelimit

Posted
  • Author
Posted

thanks for the advice guys.

Yeah, the springs hang from the top seats by about 10cm when the car is jacked up.

Darn, looks like i'll need to go search for some springs :P

Red: nah these aren't cut down standard springs. They are unknown blue coloured ones that came with KYB shocks. They seem very hard compared to the standards. All i know is that was how the package was when they came off a half cut from jap land.

Also on the subject of lowering suspension on a car, i take it i need to have my wheels re-alined?? From what i can tell the camber has changed

thanks again,

STL

blind_elk Grand Master

blind_elk

Posted
Posted
thanks for the advice guys.

Yeah, the springs hang from the top seats by about 10cm when the car is jacked up.

STL

I hope you mean 10mm (about 1/2") - 10cm is around 4"
GTRgeoff Grand Master

GTRgeoff

Posted
Posted

WARNING - thread hijack!!!!

Gary is there any suspension info you don't know?

Seriously though, I have been in touch with several uni's down here to do a Masters degree in automotive engineering design and management (since I already have a number of management subjects under the belt). I feel a need to do more automotive study, but don't want to do the undergad SAE degree, for obvious reasons.

No-one offers even an SAE automotive masters. What would you suggest? My key interests are suspension design, engine management, emmissions, and ultimately performance and motorsport. I have searched a few TAFE campuses but am still at a loss. Where do you get training and experience in these areas?

Skysthelimit Contributor

Skysthelimit

Posted
  • Author
Posted

blind_elk: unfortunately i do mean 10cm! :O That's how far they sit below the top seats when the car is up

After doing some reasearch and more driving, i have to get it fixed asap because the springs are also way too hard, they cause the car to jump around on uneven bumps, makes the car feel unsafe compared to the stokies

Does anyone know if changing to progresive springs will be an answer to my problem?? Any Reconmendations?

thanks,

cheers

STL

red900ss Grand Master

red900ss

Posted
Posted

From what I know progressive springs are the go. The springs work two ways if you will. The softer part will soak up "sharp edge" bumps. That is, typical road bumps, small holes etc. The firmer part looks after handling charactersitics.

Do some research, there are a few aussie companies that make springs for the 33.

Good luck and keep us posted.

akeenan Grand Master

akeenan

Posted
Posted
As he didnt work with sports cars, he said on normal everyday cars, that shouldnt be the case, he said that the springs should always have contact with the struts when they are fully extended.

why would a "sports cars" suspension be any different to a normal cars suspension... in this way......

I cant believe he let you drive away with it like this...

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