I have access to my buddies scales and have a few questions before I start...

With non-adjustable shock lengths (such is the case with my Illumina's) is it a bad idea to compensate by adjusting spring preload?

This car is used specifically for autocrosses at local club events. I'm likely putting out arround 200HP. With this being the case should I aim for 50/50 or should I be trying to put a 51 or 52% on the rear tires?

Any input at all in regards to corner weighting would be very appreciated!

 

I dont understand.
You dont have adjustable perches?

 

http://www.flyinmiata.com/index.php?...umber=13-57027

 

I don't believe the perches are adjustable... Guess I'll look again when I get home!

 

OK... Brain farted... I guess I can adjust the spring perches. I'm still not sure about bias front to rear...

Curly, your link put me to Flyin Miata's home page. Didn't find any information on their site in regards to corner weighting.

 

It was actually supposed to link Full Tilt to the tokico shocks I thought you had. But if they have adjustable spring perches, they're not the ones I was thinking of anyways. Are they a stepped spring perch (3-4 settings) or is a threaded sleeve (near infinite adjustability)?

Try this for some information, it's been a while since I've read through it all, but it may give you some good information.
https://www.miataturbo.net/race-prep-75/itt-you-will-teach-me-corner-balance-my-car-i-might-not-hurt-you-48595/

 

I have Ground Control coilovers on them so I have threaded adjusters.

Sorry for the slow response. I'm a medic and I'm on the ambulance right now!

Any input or experience corner weighting your Miata?

 

"No I don't need to touch you, the A in AED stands for automated, you're fine. Now let me browse MT.net in peace."

 

you aim for 50/50 "cross weights" NOT 50/50 frt. to rear, although these cars are nearly there to begin with.

of course your gonna adjust the collars up and down, otherwise what would you be doing on the scales? the only thing that you have to look out for is that you don't lower the car sooo much that you run out of shock travel mid corner. i wouldn't go below 12.25'' ride height. (hub center to top of wheel well.

 

So any input on how much bias should be going to the front or rear?

 

Curly. It does suck when we get a 911 call & I'm deeply absorbed in Miata stuff online!

 

You don't adjust front to rear unless you like adding lead to the bumpers..... Adjust the cross weights out and deal with the rest in sway bars/spring rates

 

If it gets too light mid-corner, I'm going to go hindenburg on that ****!


.

 

There's already a corner weighting thread in the race prep section, but I anticipate the answers considering I'm about to buy scales.

 

Don't buy proform scales... they are a pita to use!

 

Until one had the time or access to scales could you simply set equal ride heights on both sides with your weight in the drivers seat to get the car in the ballpark?!

 

That'll get you close-ish.

After cornerweighting, my car sat with the LF gap 1/8" higher than RF, and the LR 1/4" higher than RR if I wasn't sitting in it.

 

thats what i would do. matter of fact, i didn't have to move it much once i got it on the scales.

 

Thanks.

It's good to know it should get me in the ballpark. Did you find once on the scales your initial changes had much affect on your camber numbers from one side to the other?

 

Take several thick black trash bags and put on top of scales as sliders, disconnect sway bars, weigh car, find your low cross corners, find the lowest weight corner of that set, raise that collar a couple of turns, stand on door frame and bounce car, sit in car and reweigh, rinse and repeat. 3 out of 3 miata's were very close to equal ride height all around when they were done scaling...