Spring Help!

[mart]

Hi all, need some help!

I bought some light green front springs (W5181-75) and upon comparing them to the silver fronts (W5181-75) they are shorter and softer

I thought the light greens are supposed to be harder than silver. Have I missed something or been sold the wrong spring?

Cheers, Martyn

[Ted Maul]

Originally Posted by mart

Hi all, need some help!

I bought some light green front springs (W5181-75) and upon comparing them to the silver fronts (W5181-75) they are shorter and softer

I thought the light greens are supposed to be harder than silver. Have I missed something or been sold the wrong spring?

Cheers, Martyn

Does sound a bit odd, were the springs new and packaged in the usual Kyosho style bag? Are your silver springs the kit springs, or did you buy the car 2nd hand (as I did with mine!)

Just thinking perhaps the light greens are ok but maybe previous owner swapped kyosho kit silvers for say Silver Losi springs which may be a bit harder and longer than Kyosho giving you the impression that the light greens are short and soft if you see what I mean?

[mart]

Hi Ted,

Silvers are the ZX-5 ones and not the one that come with the RB5. Springs were brought new from a reputable model shop and in the authentic Kyosho packaging.

[RogerM]

The #75 light greens are stiffer that the silvers (#70), although only slightly as Kyoshos spring spacing is tight even by the standards of Yokomo!!!! You have to go 4-5 spring grades at the rear to go 1 gap in Losi terms!!!

The #75 spring IS shorter than all the other Kyosho springs, approx 5mm.

there are a couple of spring charts on here which show kyosho springs, I still have to finish mine as I no longer have time to race let alone work this sort of stuff out!!!

Edit ...... the #75 springs are definately harder than #70s .... I've measured them on a £40k spring tester at work which reads to 0.001N and 1µm with great accuracy and repeatability! I do need to get my spring chart out in public .... just need some time to collate the results!!

[holson]

How long are the silver springs (uncompressed)?

Are the colored ones then shorter?

[dave p hall]

Originally Posted by RogerM

The #75 light greens are stiffer that the silvers (#70), although only slightly as Kyoshos spring spacing is tight even by the standards of Yokomo!!!! You have to go 4-5 spring grades at the rear to go 1 gap in Losi terms!!!

The #75 spring IS shorter than all the other Kyosho springs, approx 5mm.

there are a couple of spring charts on here which show kyosho springs, I still have to finish mine as I no longer have time to race let alone work this sort of stuff out!!!

Edit ...... the #75 springs are definately harder than #70s .... I've measured them on a £40k spring tester at work which reads to 0.001N and 1µm with great accuracy and repeatability! I do need to get my spring chart out in public .... just need some time to collate the results!!

front silver's,are stiffer then front light green'sthat's why they don't make front dark green'sare know your kyosho manbut this is my conclusion

[dave p hall]

Originally Posted by RogerM

The #75 light greens are stiffer that the silvers (#70), although only slightly as Kyoshos spring spacing is tight even by the standards of Yokomo!!!! You have to go 4-5 spring grades at the rear to go 1 gap in Losi terms!!!

The #75 spring IS shorter than all the other Kyosho springs, approx 5mm.

there are a couple of spring charts on here which show kyosho springs, I still have to finish mine as I no longer have time to race let alone work this sort of stuff out!!!

Edit ...... the #75 springs are definately harder than #70s .... I've measured them on a £40k spring tester at work which reads to 0.001N and 1µm with great accuracy and repeatability! I do need to get my spring chart out in public .... just need some time to collate the results!!

front silver's,are stiffer then front light green'sthat's why they don't make front dark green'si know your kyosho manbut this is my conclusion

[mart]

Must have a different spring to me then because the light greens i have are defiantley softer than the silver. Will have to post um to you Roger to test!!!!

Forgeting the light green! Is there a harder front spring than the silver?

[RogerM]

Most Kyosho front springs are 45mm long.

My spring tester at work and my Losi shock tool both tell me that the light green springs are stiffer than the kit silvers.

There is no need for a dark green front, the only place I use the light green #75 spring is on carpet and then very rarely!!!

I almost exclusively run silver fronts on both the RB5 and ZX5-SP now, sometimes I run silvers with 1.5 coils cut off to give more spring stiffness but maintain the spring rate (same reason why some of the Losi boys run cut silvers on the front of the XX4).

I have always considered that the springs / damping are there to deal with the surface, the weight distribution of a car the handling balance and the geometry to tune ....... with that in mind I can't imagine why you'd want to run anything stiffer than a silver anyway!

it'd be really interesting to see your set-up and a description of the surface / track.

[sosidge]

Originally Posted by mart

Hi all, need some help!

I bought some light green front springs (W5181-75) and upon comparing them to the silver fronts (W5181-75) they are shorter and softer

I thought the light greens are supposed to be harder than silver. Have I missed something or been sold the wrong spring?

Cheers, Martyn

You are right on both counts, the front 75 are both shorter and softer (certainly not harder) than the kit 70s.

Rumour is that later production 75 are longer, but I have never seen any myself.

If you are looking for something stiff, get some 80 rears and cut down.