mx5-kiwi

I recently tested at one of our series race tracks and for the first time have had the Aim Evo4 and MXL unit installed and working.

It is very interesting reviewing laps and all the different data info and graphs it throws out.

However, not having a base line to work from I am interested to know....

Playing around with the Race Studio Analyses software shows the car achieved a max 1.34 G load.

Is this about where our cars can usually get to/ or normal....

Should I be aiming higher?

Does this reading seem incorrect / out of range for what our cars can/could/should achieve?

Reminder: 89 Mx5 on 15x9 6ULS with Nitto NT01 tyres (about a season old) approx 950kg.

Interested in any thoughts, experience etc.

acedeuce802

iTrader: (1)

Do you have any data plots? Is 1.34 G a peak value or is the data filtered at all? It really depends on where you saw 1.34 G's to dictate whether or not that's good. For example, our FSAE car will sustain about 1.35 G's steady state on a skid pad, however will see an average (after filtering) of around 1.6-1.7 G's in transients, and can peak over 2.0 G.

mr_hyde

iTrader: (4)

That's in the ballpark that I am seeing. With my Aero, I can sustain 1.3 to 1.4 in a flat carousel and spike in the 1.6 range laying the car into something with camber. Same wheels and tires and a better shoe could probably get more out of it too...

mx5-kiwi

1.34 was a peak in a slightly cambered 3rd gear (I run a 6 speed) hairpin.

What I wanted to know was this in the ball park and it appears that it must be.

I presume Aceduece and Mr Hyde, that aero is the reason you have significantly higher figures...

Anyone have any reference they can share on an un "aero'd" or winged car?

hornetball

iTrader: (4)

Numerous vids in this link that show a friction circle: https://www.miataturbo.net/build-thr...1/#post1189366

1.3 is right in the ballpark of what I see using BFG Rivals and, now, Maxxis RC-1s. The Maxxis tire is pretty similar to an NT01 I think.

cyotani

iTrader: (8)

I'm not sure if you need to have a paid version of Race Studio to do this but you can make a histogram scatter plot or acceleration data and the outer envelop is essentially your traction circle.

EDIT: NOT MY CAR. Not even a miata. Just a random google image.

ThePass

iTrader: (3)

Took me a minute to figure out how to do it, but looks like you don't need the paid version to plot histograms.

What is technically considered 'steady' state when viewing track data as opposed to being able to test on a skidpad? 1 second? 3 seconds? My data fluctuates throughout a turn as I adjust the attitude of the car, etc...

I'm seeing 1.55-1.6 momentary peaks, usually in the first 1/3rd of a turn, with a more steady 1.45-1.5 in some turns

(on old NT01s)



-Ryan

hornetball

iTrader: (4)

So, you're being a wuss and need to keep your foot in it!

Here's a 1:25 lap at MSR-C 1.7CCW (no-aero and same orientation as cyotani for braking/acceleration):



My lap isn't as clean as you other guys, have lots of hits where I should have holes. Need to work on that.

mx5-kiwi

Hey that is great data there guys!

I'll have to figure out race studio for the scatter plot. Thank you.

Also answers some questions about aero versus non aero....I asked once before and someone else recently did too about quantifying aero gains.....over in the Aero thread.

cyotani

iTrader: (8)

I edited my post to note that the data is not my car and it is not a miata. Just an example of a data analysis tool. If someone could do similar with a miata comparing various aero setups that would be great.

ThePass

iTrader: (3)

Yeah I couldn't figure out how to invert the y-axis in the little time I've spent fiddling with it.. No, I'm not accellerating at 1.2 G's like a boss.

-Ryan

hornetball

iTrader: (4)

But you are braking at 1.2G like a BAUCE!! I can't come close to that much braking without encountering lockup. Whatever your braking combination is (downforce, tires, whatever), it works well.