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Big Bore Spring Rates

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Joined: 29 November 2012
Location: Dublin, Ireland
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Points: 2
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    Posted: 29 November 2012 at 9:59am

A club member was helping me with the setup of the SV and he had some AE & Durango big bore springs.

When we compared the overall resistance of a 4 lb/in Durango spring to a medium (front) 4lb/in Schumacher, the Schue spring seemed VERY soft compared to the Durango, a lot less resistance than the Durango spring?

I would have thought that a lb/in rating should be almost identical across different spring types? 

The highest Schue front rated spring I had was a 4 lb/in but on heavy breaking at the end of a long straight the front was diving so much the inside rear wheel was lifting.
When I installed a Durango 4lb/in front spring it transformed the car, I could dive into the corner at the end of the straight and the SV was stable without the inside rear wheel lifting.

Overall I feel the Schue springs are soft + the difference between a 3.5lb/in & a 4.5lb/in Schue spring is barely noticeable whereas the Durango difference is very noticeable.

Do I have defective springsCry or is this 'normal' for Schue big bore medium (front) springs?

Thanks in advance for any replies Very Happy
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Cockerill View Drop Down

Joined: 21 October 2011
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Points: 2
Post Options Post Options   Thanks (0) Thanks(0)   Quote Cockerill Quote  Post ReplyReply Direct Link To This Post Posted: 04 December 2012 at 11:00am

Our springs are QC’d to ensure that they are the correct rates. 2 Springs of the same rate, but different construction (Length, Wire, Coils) can have a very different feel, especially in your hands. Springs can also lose some of their effectiveness over time.


If you require a stiffer spring we do offer a 4.5 and 5.0 front spring for our Big Bore range. If you still think your spring could be defective please email me on tom ‘at’ racing-cars.com and we’ll get to the bottom of it.
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