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Kilen Technical Tips

 

Kilen Frequently Asked Questions

 

1. Is it correct that the HD rear springs I bought are shorter than the standard ones I took off the car?

Answer: Most HD rear springs are shorter than the standard springs because the car should not stand too high unloaded.

 

2. Why do original for my car keep many more springs to chose from than Lesjöfors do?

Answer: Original has many different springs for each model, but the difference between them is usually minimal. That is why Lesjöfors chose to use one or only a few springs, replacing most of the original alternatives.

 

3. Which type of spring compressors do you recommend for replacing chassis springs?

Answer: Mounting tools of high quality should be used and never compressing tools with hooks in each end.

 

4. Do I have to make a wheel alignment on my car after having changed the springs?

Answer: To avoid unnecessary and possible tire wear etc. we recommend that, yes.

 

5. How much stiffer is a reinforced rear spring compared to a standard one?

Answer: It depends on which car is concerned, but generally it varies between 15-30 % stronger.

 

6. Is it possible to buy only the front or rear springs from the Lesjöfors sport spring kits to my car?

Answer: No it is not, we only sell complete kits. There are of course kits containing only the front or the rear springs, but that is due to a different suspension system front or rear of that car, for example torsion bar.

 

7. Do I have to change the shocks if I buy a Lesjöfors sport spring kit?

Answer: Lesjöfors has developed the sport springs to work together with the standard shocks. If you wish to get an ever better road holding, we recommend to switch to gas shocks. In any case, whilst changing to sport springs, one should always check the condition of the shocks. If they are bad they must be replaced.

 

8. Are the Lesjöfors sport springs progressive?

Answer: Many of the sport springs are progressively coiled in one end, but this is only done to give the spring additional coil material needed to keep the spring in place when the car is lifted and the wheels are hanging free. When the car is put down again, these coils are compressed and the spring’s area of operation is all linear. The sport spring is therefore not progressive.

 

9. I am going to mount Sport springs from Lesjöfors and the diametre at both ends is the same, but the spring is more closely coiled at one end. Which end should be up and which one down?

Answer: For the coil’s performance it does not make any difference, but we always recommend to mount the end with the closer coils up to avoid the noise that may arise from gravel, chips etc. slipping in between the coils.

 

10. Why don’t Lesjöfors keep Sport spring kits that lower more than 40 mm?

Answer: There is a risk of a negative impact on the road holding if cars are lowered in excess of 40 mm. Reduced or no spring travel distance is common on kits lowering for example 60 mm. The philosophy of Lesjöfors is that it is not possible to achieve a well functioning spring at such lowering rates without problems regarding the coordination with the standard or the gas shock absorbers. If you wish to achieve a lowering effect over 40 mm, you should use the so called Coil-overs.

 

11. Why do you say ”Sport springs” instead of ”Lowering springs”?

Answer: Our kits are designed primarily to enhance the driving conditions with slightly stiffer springs and a moderate lowering effect. Lowering springs are usually not stiffer than the original springs and are only developed to lower the car

 

12. Can I as a private person buy directly from Lesjöfors Automotive AB?

Answer: We ask you to contact one of our Distributors/Importers instead. Our clients usually work with shops well distributed across the country and can normally deliver our springs within 24-48 hours.

 

13. Why does a gas spring lose its pressure when the temperature is below 0 degrees C?

Answer: The nominal temperature of a gas spring is +20 degrees C. The power of the spring is then influenced relative to each degree difference by 0,34 %. At minus degrees the power deteriorates, at plus degrees it is reinforced

 

14. Someone told me, you simply keep several metres long steel bars, which you cut to different lengths depending on the car model requested?

Answer: It is not that simple! The springs differ greatly, depending on the weight of the vehicle, and its construction at the front and rear axles.

 

15. Why do you recommend spring repair in pairs, although it might be only one spring broken?

Answer: Both springs on, for example, the front axle, are exposed to the same stress and wear out gradually. If you mount a new spring on for example the front right side and keep an old and worn out spring at the front’s left side, the car will most probably be imbalanced. Of course there is also a greater risk that the spring that was not replaced also will break.

 

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