Highest lateral G force grip after wheel / tire / suspension? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

iBoost · 10-05-2014, 04:56 PM

Modified FR-S / BRZ owners are commenting their cars handle significantly better than stock, so has anyone measured this grip improvement in a quantifiable manner?

Ex: some cars, like the Nissan GTR and new Fiat 500 Abarth display G forces during turns and accel / braking.

What is the highest turning grip you guys are recording on your modified FT86 cars and with what wheels, tires, suspension mods, and g force measuring device?

Captain Snooze · 10-05-2014, 05:55 PM

Transient g can be higher than sustained cornering but at the local track there is no steady state cornering. I am a little impressed by my peak (1.5g) but it is somewhat irrelevant in the grand scheme of going fast. One can generate high transients by jerking on the steering wheel but this will probably happen just before you go cross country off track.

dradernh · 10-05-2014, 07:27 PM

This is data from a different car but the principles will hold for a twin. The peak of -1.76g was held for a total of 0.019 seconds. My takeaway is what it's always been: Peak lateral g-force numbers are entertaining. BTW, that car ran a peak of -1.97g in that turn during the same on-track session. Sensor: Crossbow CXL04LP3 4G Accelerometer.

Trace showing spiky lateral g-forces during two seconds in the middle of a turn in a high-downforce, race-tired race car:

And a video showing the data in action:
[ame="https://www.youtube.com/watch?v=gO4Up84jqL8"]WGI Video of T1 to Go with Graph Showing Typical Spiky G-Force Trace - YouTube[/ame]

zdr93523 · 06-23-2015, 01:52 AM

I sustained 1.48 g's through a long, 180 degree, lower speed corner at Miller Motorsports Park this weekend.

bfrank1972 · 06-23-2015, 10:05 AM

What are you trying to achieve exactly? Comparison of tire compounds? Or comparison of a wider tire to the stock tires? I think it's tough to accurately quantify differences in g-forces generated by switching tires - too many environmental factors at play. First off you'd have to swap the tires and do a test on the same day, same conditions, close to same time of day, same track/test area (preferably smooth), same wheels, same width, same tire pressures, both tires up to operating temps to really make an accurate quantifiable comparison in generated g-forces. Would be an interesting thing to see - but it's just one small metric among a huge number of factors that lead to better lap times (weight, operating temps, sidewall compliance, rim width, responsiveness, breakaway characteristics, etc). Most appraisals of tire performance are from lap times and driver feedback.

troek · 06-28-2015, 10:24 PM

my fastest lap has less gs pulled in most corners compare to the times i try to beat that lap lol.

cdrazic93 · 06-28-2015, 10:54 PM

@CSG Mike ?

Calum · 06-29-2015, 07:21 AM

Quote:

Originally Posted by troek

my fastest lap has less gs pulled in most corners compare to the times i try to beat that lap lol.

Smoother driving is better, got it. But if you can drive smoothly, while bringing the car to its limits you'll be even faster.

troek · 06-29-2015, 09:54 AM

yeah, i agree, i was just mostly making the point that measuring g's is not the best way to measure if your driving faster.

10-05-2014, 04:56 PM	#1
iBoost Member Join Date: Aug 2014 Drives: Subaru Forester XT Location: Texas Posts: 10 Thanks: 0 Thanked 2 Times in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Highest lateral G force grip after wheel / tire / suspension? Modified FR-S / BRZ owners are commenting their cars handle significantly better than stock, so has anyone measured this grip improvement in a quantifiable manner? Ex: some cars, like the Nissan GTR and new Fiat 500 Abarth display G forces during turns and accel / braking. What is the highest turning grip you guys are recording on your modified FT86 cars and with what wheels, tires, suspension mods, and g force measuring device?

10-05-2014, 05:55 PM	#2
Captain Snooze Because compromise ® Join Date: Jan 2012 Drives: Red Herring Location: australia Posts: 7,823 Thanks: 4,053 Thanked 9,565 Times in 4,199 Posts Mentioned: 60 Post(s) Tagged: 0 Thread(s)	Transient g can be higher than sustained cornering but at the local track there is no steady state cornering. I am a little impressed by my peak (1.5g) but it is somewhat irrelevant in the grand scheme of going fast. One can generate high transients by jerking on the steering wheel but this will probably happen just before you go cross country off track. __________________ My car is completely stock except for all the mods.

10-05-2014, 07:27 PM	#3
dradernh Senior Member Join Date: Feb 2014 Drives: Used to Drive:Grand-Am GS #54 E36M3 Location: So. OH Posts: 561 Thanks: 77 Thanked 237 Times in 163 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	This is data from a different car but the principles will hold for a twin. The peak of -1.76g was held for a total of 0.019 seconds. My takeaway is what it's always been: Peak lateral g-force numbers are entertaining. BTW, that car ran a peak of -1.97g in that turn during the same on-track session. Sensor: Crossbow CXL04LP3 4G Accelerometer. Trace showing spiky lateral g-forces during two seconds in the middle of a turn in a high-downforce, race-tired race car: And a video showing the data in action: [ame="https://www.youtube.com/watch?v=gO4Up84jqL8"]WGI Video of T1 to Go with Graph Showing Typical Spiky G-Force Trace - YouTube[/ame] Last edited by dradernh; 10-05-2014 at 11:18 PM.

06-28-2015, 10:54 PM	#7
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	@CSG Mike ? __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

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06-23-2015, 10:05 AM	#5
bfrank1972 Senior Member Join Date: Jul 2013 Drives: 2013 FR-S Argento Location: Westport,CT Posts: 1,855 Thanks: 517 Thanked 1,041 Times in 616 Posts Mentioned: 7 Post(s) Tagged: 1 Thread(s)	What are you trying to achieve exactly? Comparison of tire compounds? Or comparison of a wider tire to the stock tires? I think it's tough to accurately quantify differences in g-forces generated by switching tires - too many environmental factors at play. First off you'd have to swap the tires and do a test on the same day, same conditions, close to same time of day, same track/test area (preferably smooth), same wheels, same width, same tire pressures, both tires up to operating temps to really make an accurate quantifiable comparison in generated g-forces. Would be an interesting thing to see - but it's just one small metric among a huge number of factors that lead to better lap times (weight, operating temps, sidewall compliance, rim width, responsiveness, breakaway characteristics, etc). Most appraisals of tire performance are from lap times and driver feedback.

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