I want handling performance, not slam-age.

revhead · Postby **revhead** » Fri Jul 04, 2014 5:52 pm

I would not go softer than 9/6, in fact I wouldn't mind going a step firmer. But for 90% street use, and 10% recreational track duties, the 9/6 is excellent in the mca blues

plohl · Postby **plohl** » Fri Jul 04, 2014 7:01 pm

I think they run slightly stiffer on the NBs...

sailaholic · Postby **sailaholic** » Fri Jul 04, 2014 7:23 pm

Yup nb spec is now 11/7 with 9/6 on the Na.

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LiteIsRite · Postby **LiteIsRite** » Fri Jul 04, 2014 8:42 pm

revhead wrote:They are very comfortable on average condition roads and are an excellent product which I am happy with.

Don't get me wrong though, they are not like driving on clouds. If you hit a pot hole or go over rail tracks the car takes a beating which you can feel.

What you gain in an excellent product definitely out weights the minor discomfort on the harshest of road conditions.

Cheers, that's what I wanted to know!

plohl · Postby **plohl** » Fri Jul 04, 2014 10:44 pm

revhead wrote:They are very comfortable on average condition roads and are an excellent product which I am happy with.

Don't get me wrong though, they are not like driving on clouds. If you hit a pot hole or go over rail tracks the car takes a beating which you can feel.

What you gain in an excellent product definitely out weights the minor discomfort on the harshest of road conditions.

+10

TurboDoseBro · Postby **TurboDoseBro** » Sat Nov 15, 2014 4:52 pm

Anyone actually recommend going for 12F:9R instead of the stock 9F:6R for the MCA Blues if comfort wasn't a high priority? Or would it actually be faster with a softer spring rate due to our suspension layout of double A arms?

Magpie · Postby **Magpie** » Sat Nov 15, 2014 5:06 pm

TurboDoseBro what spring frequency do you want?

12F:9R sounds great for somebody but what is the aero on your car, intended purpose, unsprung weight, sprung weight, motion ratios, corner weights, ride heights, centre of gravity, roll centre and a host more questions. Why not just go for the stock 9/6 spring rates as that was what the car was designed with?

As I posted previously : Springs absorb the shock loads from the wheels and minimise the loads to the chassis. The springs absorb loads as potential energy and then releases it as kinetic energy. The damper controls the kinetic energy released by the spring. Understanding how the components of the coilover work together with the rest of car will help you make your decisions. What works me me may not work for others, however the logic in reaching the decisions are the same.

If your springs are too stiff they will not absorb the potential kinetic energy rather they will resist. If the springs resist then there could be the risk your damper controls will not work or not work well. Hence the need to revalve especially if going 12/9. Too stiff springs will make the car skate accross bumps, but if the road was smooth give better grip... decisions... decisions... decisions.

sailaholic · Postby **sailaholic** » Sat Nov 15, 2014 6:28 pm

Mca go to 11 or 12 /7 I think for a Nb. It's the ratio of the spring rates not the absolute difference that determines balance between over/under steer.

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Magpie · Postby **Magpie** » Sat Nov 15, 2014 7:23 pm

Not my words:
". . . there is a good reason not to have equal frequencies. The inputs are experienced at the front wheel and then some time later at the rear. If you have equal frequencies then there will be mismatch in the phase of the damped curves, dríven by the velocity of the car and the wheelbase length. This will force a pitching motion. To avoid this, the rear frequency is generally higher by some multiple of the front. Guideline values from Olney, Milliken, and SAE references support a range of 1.2 to 1.3 times the front frequency to achieve a flat ride."

You chose your spring rates to control your tyre to maintain tyre contact with the road (grip).

sailaholic · Postby **sailaholic** » Sat Nov 15, 2014 9:24 pm

Sounds like something fat cat would say.

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TurboDoseBro · Postby **TurboDoseBro** » Sun Nov 16, 2014 1:29 pm

Actually it should be 12F:8R to keep the 3F:2R ratio. Didn't do any calculations, just thought it was the next best thing for someone who doesnt prioritise comfort and wants a bit more speed

. Most likely if I do order the 12F:8R it will be revalved to match. Some tuning shops use even heavier springs for mountain setups anyways.

roket52 · Postby **roket52** » Wed Nov 19, 2014 11:23 pm

Revalving mca blues is almost pointless. I've had mine revalved twice and they still lack rebound damping which is very disappointing . If you want to run track orientated springs you need a track orientated valve setup like what is in the reds at a minimum. Blue valving is road performance at best not track level gear.