What are people seeing on their G-meter

[boisecrawfords]

Took her into the mountains a couple weeks ago and recorded 1.2g in braking and cornering. Where are others seeing the limit? Tour suspension with stock tires.

 

[Mal-lotus]

In a track environment I recorded 1.5g on the dash on the original Goodyear tires, sport chassis.

 

[Mr.Gear]

Tour suspension, stock tires, street drive. No mods. V6 MT Still haven’t felt the car break loose in the slightest.

 

[Mal-lotus]

Wow my car will not approach 1.1g in acceleration unless someone rear ended me

But maybe that's from a hard launch?

 

[Mr.Gear]

Wow my car will not approach 1.1g in acceleration unless someone rear ended me

But maybe that's from a hard launch?

Haha. Nah, I’m too worried about axles to do a hard launch.

Try accelerating starting at 3 or 4k in first gear. You want the car to be in its power-band to get the full effect.

 

[Syzygy]

Haha. Nah, I’m too worried about axles to do a hard launch.

Try accelerating starting at 3 or 4k in first gear. You want the car to be in its power-band to get the full effect.

Are any companies working on an upgraded axle? I keep seeing concerns about the axles and it is making me worried about tuning.

 

[Mal-lotus]

Same,

I've definitely run 1st to redline, only managed 0.9

Probably traction or maybe your engine is a nicer specimen than mine.

 

[crainp]

Stock I4, Sport, Cup2, 1.12 was tops for day at Spokane last summer. This was on Garmin Catalyst, so pretty accurate. Didn't look at car gauges-wouldn't have been a good time to do that

 

[Y Cymro]

Tour suspension, stock tires, street drive. No mods. V6 MT Still haven’t felt the car break loose in the slightest.

View attachment 75737

I assume that your 1.1G reading is under braking rather than acceleration. 1.5 laterally is pretty rare for any car without significant aero, and likely impossible for a road car under any conditions other than being hit sideways by an artic. Perhaps the calibration is out, or it jerked over a bump or something.
As examples, an Ultimate GTR holds the road car record and will reach about 1,2G laterally on a skid pan (an Elise is just under 1G), whilst a 911 992.2GT3RS with outstanding traction and grippy tyres will better 1.0G on acceleration up to around 30MPH and less after that.

 

[Mal-lotus]

Transient G loading is different than sustained G loading, which is what is measured on a skidpad.

You can definitely hit 1.5g transient, all you have to do is sustain 0.5ish G in one direction and then turn the other way at the limit of grip (which will be close to 1G) and you've got yourself a temporary G force above your skidpad rating.

Its pretty easy to feel 0.9g vs 1.5g while driving the car. My gokart can sustain around 1.5g but transient spikes of 2.5g feel like my ribs are going to break -- even wearing my rib guard. And then the race computer backs it up with gps, accelerometer and gyro data.

 

[geoffbland]

I assume that your 1.1G reading is under braking rather than acceleration.

The 1.1G is shown at the bottom of the chart - so that's braking isn't it? Top shows 0.5g for acceleration.

 

[Mal-lotus]

Bottom is acceleration top is braking.

 

[geoffbland]

Bottom is acceleration top is braking.

Ah OK thanks!

 

[drummingj]

Cool thread!

For me, I think this was the highest I’ve seen.

1.5G on track at the Lotus factory test track. The instructor said it was about the max I would get from the touring & Goodyear setup

 

[Mr.Gear]

I assume that your 1.1G reading is under braking rather than acceleration. 1.5 laterally is pretty rare for any car without significant aero, and likely impossible for a road car under any conditions other than being hit sideways by an artic. Perhaps the calibration is out, or it jerked over a bump or something.
As examples, an Ultimate GTR holds the road car record and will reach about 1,2G laterally on a skid pan (an Elise is just under 1G), whilst a 911 992.2GT3RS with outstanding traction and grippy tyres will better 1.0G on acceleration up to around 30MPH and less after that.

Mal-Lotus is correct. You’re referring to apples and oranges here. Skidpad and real world driving are very different. Our G Meters measure “max” not sustained.

The original posted question is “what are people seeing on their G Meter”

1.1 is my acceleration not braking.

 

[Lotus64]

1.6g lateral on Sports / Cup 2.

 

[Y Cymro]

You’re all kidding yourselves if you think your cars can achieve an acceleration rate of 1.1G, or 1.5G laterally.

 

[OppositeLock]

Nice thing about running a data logger, is that you can see the extremes of G forces over time.

Here's a lap of Sonoma Raceway.

Top graph is linear acceleration, so braking and acceleration. The graph is heavily skewed negative because the car stops a lot faster than it can accelerate, but still, you can see that at Sonoma, I got a bit over 0.4g acceleration and got down to -1.2g braking.

Lateral acceleration (cornering) frequently crosses 1g, and at this track, I it -1.5g in two places and come close in a third.

 

[Mal-lotus]

You’re all kidding yourselves if you think your cars can achieve an acceleration rate of 1.1G, or 1.5G laterally.

Can't speak for the acceleration, most I've seen is 0.9g with a moderate launch. 1.5G laterally, sure, happens pretty often driving near the limit.

See post above about peak G vs sustained G. The dash measures peak G (probably only semi-accurately, but @OppositeLock has supporting data from a race computer).

 

[Lotus64]

You’re all kidding yourselves if you think your cars can achieve an acceleration rate of 1.1G, or 1.5G laterally.

There's a difference between sustained and peak G forces. Emira on sports / cup2s sustains 1.06g laterally continously but peaks much higher than that. The readout is measuring peak G's.