benners05
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| posted on 10/4/17 at 12:26 PM |
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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
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| posted on 10/4/17 at 01:54 PM |
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Have you checked your static ride heights front to rear and make sure the rear is higher?
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phelpsa
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| posted on 10/4/17 at 07:10 PM |
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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
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| posted on 10/4/17 at 07:54 PM |
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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
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| posted on 11/4/17 at 05:15 AM |
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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
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Talon Motorsport
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| posted on 11/4/17 at 06:30 AM |
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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
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| posted on 11/4/17 at 09:30 AM |
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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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