Pulling Gs
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Joined: May 2019
Posts: 54
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From: Oakland, CA
Pulling Gs
So I took my new Cayman S for a rather twisty ride yesterday. While I certainly drove in a spirited fashion, at no time did I hear the tires squeal -- nor did the PSM activate, to the best of my knowledge. Yet I was slightly surprised to see lateral G peaks of 1.06 and 1.02.
Is this normal? Would be curious to know, outside of a skidpad, what numbers you all are seeing...
Is this normal? Would be curious to know, outside of a skidpad, what numbers you all are seeing...
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Yes, normal. Depends on the road you were driving, but a typical road will have camber/banking which allow for higher G's. Plus undulations in the road can cause for a high spike in the readings.
Car magazines are reporting/recording the G's based on a flat skid pad, so you find out what the real hold G's of the tire/alignment are in the car and those numbers will be a lot lower ( <1).
Car magazines are reporting/recording the G's based on a flat skid pad, so you find out what the real hold G's of the tire/alignment are in the car and those numbers will be a lot lower ( <1).
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Joined: May 2019
Posts: 54
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From: Oakland, CA
Interesting, thanks for the info! So when the magazines measure the car's lateral acceleration capability, do they take it on a flat skidpad and record the highest number that the car can sustain continuously...without slipping? Or do they push it well into oversteer/understeer territory?
Instructor
Joined: Mar 2018
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From: Chandler, AZ
Most of the tires that are available on the 718 will require a lot of lateral G and/or braking force to make much sound. Hard to achieve on a public road, you will hear them on a track when you approach the limit of adhesion.
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Found it, the original source is a GT3RS, Peter (Trakcar) runs a lot at Sebring, very bumpy.
https://rennlist.com/forums/991-gt3-...l#post12665040
https://rennlist.com/forums/991-gt3-...l#post12665040
Burning Brakes
Joined: Oct 2016
Posts: 785
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From: North Jersey
First 3 pics are from my 2016 CGTS on OEM Good Years that were at about 4/32 “ to 5/32 nds “ of tread depth - probably the sweet spot. I have since worn the Good Years out and replaced them with Michelin PS4S.
Last 2 pics are with the PS4S ‘S - I definitely think I can duplicate a 1.38 or better with the Michelin ‘s when the conditions are right. The Michelin’s only have 2,000 miles on them and the tread depth is ~ 8/32 nds “ so I need to season them a bit more
The PSM did not kick in at anytime.
Rennlist Member
Joined: Jan 2016
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From: New Orleans, LA (NOLA)
Best I have done is 1.2 lateral Gs on a flat track with normal street tires. That is still pretty good.
