I calculated my ride frequencies

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Centenario S2, no aero (has a decent bit stock)
3081 lb, 44%
Springs: 427 - 530
Ride frequency: 2.46 Hz

Ford GT '05, S1, full aero
3185 lb, 44%
495 - 630
2.62 Hz - Max aero f/r

GTR LM FE, S2, front aero
2464 lb, 53%
465 - 409
2.63 Hz - Lots of downforce on this one.

Subaru WRX 2010, A800, rally tires, full aero
3466 lb, 57%
380 - 280
1.91 Hz

#199 WRX, S1 stock aero but lots of suspension travel
3244 lb, 57%
348 - 259 (minimum rear spring)
1.91 Hz - I always thought this was stiff, turns out it’s identical to my 2010 WRX. Could have told that just by the rates and weight but eh.

Jaguar D-Type, S2 960, no aero
2363 lb, 56%
250 - 196
1.92 Hz

Lamborghini Veneno, S2, rally tires
3472 lb, 42%
409 - 560
2.33 Hz -This setup has my old damper approach and might change.

Lamborghini Diablo, S1, no aero
3063 lb, 44%
338 - 440
2.22 Hz - Lower limit of race suspension

Mugen Civic, A800, no aero
1840 lb, 62%
291 - 217
2.23 - 2.46 Hz - The only car I’ve recently tuned with higher rear than front NF.

Toyota Baja, S1
4175 lb, 43%
100 - 133
1.04 Hz - Minimum possible rates

Warthog, A800
4918 lb, 54%
197 - 166
1.20 Hz -Also minimum

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After sampling, it’s clear all of the standard cars have a ride frequency range of 2.01 to 4.49 hz in race/drift suspension, and 1.42 to 3.18 hz with rally suspension. This assumes 50/50 weight distribution; cars with 40/60 or 60/40 weight distribution have a range of 2.24 to 4.10 matched hz with drift/race (quite stiff for a drift car…) or 1.59 - 2.90 hz with rally suspension.

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being a bit thick, can you explain the relevance of knowing this?

how do you come to this number?

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I used [edit] this calculator

to build a spreadsheet calculator, like this.

[Album] imgur.com

2-2.5hz seems appropriate for most cars in Horizon as even the cars with basic aero parts qualify as moderate downforce, and the actual G forces (uncorrected) are often near or beyond 2Gs. The roads are rough as well, not to mention freeroam rush, so the softest rate that doesn’t bottom out regularly is best… in my best theories.

It was calibrated as truly to the other spreadsheet as possible. I blame them if it’s skewed and haven’t cross-checked it yet. Nor was I able to make any of various formulas I sourced a few months ago give good results after various conversions or even agree with each other.

The ride frequency formula ended up being =([Spring]19.5595/([Weight][Weight Distribution as an integer]/100))^0.5 for the front and =([Spring]19.5595/([Weight](100-[Weight Distribution as an integer])/100))^0.5 for the rear.

I’m still working on a spreadsheet I can share publicly with confidence it will help anyone who uses it learn to tune quickly and tune faster if they know what they’re after. This is basically where it’s at right now.
Imgur: The magic of the Internet < I linked a pic of the wrong sheet at first.
There’s another section that’s evolved multiple times, with more manual inputs and fewer, specific outputs, that I will try to include cleanly in another sheet of the same file, as well as the basic F/R ride frequency calculator.

1 Like
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Few question:
Did you use the formulas in the mentioned source (Tech Tip: Springs & Dampers, Part One, The Phantom Knowledge)?
What units did you use? SI-Units?
Are you still working on publishing that spreadsheet? I’d be very interested :smiley:

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Where, K is spring in N/m, M is mass in KG.

Hz=(K/M)²/2π

Convert to lbf/in and pounds, and the formula can be simplified to

Hz=(K/M*19.56)²

Where K is spring in lbf/in, M is mass in pounds over the axle in question (300054 for the front axle of a 3000lb, 54% car, 3000.46 for the rear).

To find the spring for a desired ride frequency,

K=(2πHz)²*M

A simplified formula after converting to lbf/in and pounds is

K=(Hz²M)/19.56

Where M is the weight over that axle (same as above) in lbs and the result is in lbf/in.

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Crikey!.. I’m prob a keen novice when it comes to tuning, understanding just enough to get a half decent tune together but this has just blown my mind :slight_smile:

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I did a study of the default Race/Rally rates on Horizon cars.

There are only 2 rates for Rally suspensions (front - rear).
1.72 - 1.91 if stock PI is 800 or below
2.14 - 2.38 if stock PI is 801 or above

Race suspensions have more variation. I found 5 outliers.

2.56 - 2.72 Morris Mini-Traveler
**2.36 - 2.38 **Auto Union Type-D
2.29 - 2.29 Benz W154
1.72 - 1.82 Lotus Eleven
3.18 - 3.34 F1 GT

I also checked the Maserati 8CTF (open-wheel, vintage race car, like the Type-D and W154). It has “standard” rates.

3 high-downforce cars showed the highest rates.
3.31 - 3.49
X-Bow GT4
Radical RXC
Vulcan FE

2.77 - 2.92
Atom 500 V8
2004 GT3
X-Bow R
Centenario
LP-570-4 SV
2018 GT2 RS
Mosler MT900S

**2.88 - 3.04 **
Austin 3000 MK III
Chevelle SS
Triumph Spitfire
MGB GT

2.72 - 3.20
2018 Civic Type-R
RSX Type-S
Integra Type-R

2.88 - 3.20
RS3 Sportback
Corrado VR6
CR-X SiR
1992 GTI
2010 Golf R

3.04 - 3.20
Mitsubishi GTO
Maserati 8CTF
Hellcat
2004 RS4
2006 RS6
2002 Z06
TVR Tuscan S
2016 R8
Reventon
2013 R8
2017 NSX
Saleen S7
Chiron
Veyron
Ultima Evolution Coupe 1020
Zonda R