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Author: Subject: Spring rates
benners05

posted on 10/4/17 at 12:26 PM Reply With Quote
Spring rates

Hi All!

Just wondering what spring rates people are running. I've got an BEC avon which at high speed (70mph) goes light on the front. I'm wondering if this is because it is sitting down on the rear axle

Any advice on springs or any other possible cause would be appreciated!

Ben

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mikeb

posted on 10/4/17 at 01:54 PM Reply With Quote
Have you checked your static ride heights front to rear and make sure the rear is higher?
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phelpsa

posted on 10/4/17 at 07:10 PM Reply With Quote
quote:
Originally posted by benners05
Hi All!

Just wondering what spring rates people are running. I've got an BEC avon which at high speed (70mph) goes light on the front. I'm wondering if this is because it is sitting down on the rear axle

Any advice on springs or any other possible cause would be appreciated!

Ben


Sevens have a natural tendency for front end lift, particularly if the engine bay is open to the floor.

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johnemms

posted on 10/4/17 at 07:54 PM Reply With Quote
2.0 Zetec. Book Chassis . Live Axle.
250lbs front 120lbs rear






Own chassis & Build - First time pass!!
"7's" aren't really "cars", they are 'experiences"

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907

posted on 11/4/17 at 05:15 AM Reply With Quote
Beware when comparing spring rates as so much depends on the angle at which they are mounted.

Also, you may be paying the penalty of having a lightweight engine, possibly mounted well back?
You can't have your cake and eat it, as they say.


Paul G





Member of the Suttol Owners Club, the MX5 Owners Club and the BMMC

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Talon Motorsport

posted on 11/4/17 at 06:30 AM Reply With Quote
Have you considered the shape of the nose, if the lower section just rolls under the opening it could be causing some lift? Maybe add some angled winglets to the side or take a 40-50mm hole saw to the bottom of it so it passes through rather than under it?
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Neville Jones

posted on 11/4/17 at 09:30 AM Reply With Quote
Going light at speed points to lift being generated.

The comments above about rake and ride height are true as well.

A piece of flat ali or carbon sheet or similar, attached under the front of the chassis and going all the way up to the nose front or more, supported by the nose will work wonders.

My son did it on his car, and didn't realise just how much downforce this little addition would make. No support, and the thing was bending down and touching the tarmac, and eventually ripped off. He said he could feel the difference with the 'spoiler' missing.

Cheers,
Nev.



[Edited on 11/4/17 by Neville Jones]

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