Skid Pad Rating?

Post by **gounc14** » Fri Jan 16, 2004 11:52 am

Does anyone know what an s13 can do on the skid pad? Just kind of curious, been reading about a bunch of cars skid wise today, and I'd like to know

Post by **Kiwi_S13** » Fri Jan 16, 2004 11:52 am

I believe a stock s13 se with oem tires pulled .87 or .88 its been awhile.

Website · Post by **elbles** » Fri Jan 16, 2004 11:52 am

Yeah, that sounds right to me . . . a S13 SE pulled 0.86-0.88 g's, IIRC, it was in a magazine on a "look back" a while ago, I think it was Road & Track. If anyone has any of the original magazines testing the 240, and a scanner, I'm sure we'd all love to see the official stats. :-)

Post by **Spec-R** » Fri Jan 16, 2004 11:52 am

what about the s14????

Website · Post by **elbles** » Fri Jan 16, 2004 11:52 am

I would imagine the S14 is very similar, though I'd still love to see magazine tests of both cars . . . maybe I'll have to scour eBay for old issues of car magazines.

Post by **crzycav86** » Fri Jan 16, 2004 11:52 am

It probably get's around the same.

I like to use my g-tech to get some skidpad results. I think I was getting mid 80's with a stock car and bald tires.

Website · Post by **elbles** » Fri Jan 16, 2004 11:52 am

Just bought a 1989 copy of Road & Track when they tested the 240SX for the first time . . . can't wait to get it. :-)

Post by **jrc90240sx** » Fri Jan 16, 2004 11:52 am

Anyone try to email any of the big 3 car mags about it? maybe they could give us there numbers they got back when they tested the car. maybe i will email them, wish me luck.

Website · Post by **elbles** » Fri Jan 16, 2004 11:52 am

Good luck with it man; most places will charge you for the copies of old reviews, assuming they even have them back that far. As soon as I get my copy, I'll post the specs for the S13.

Post by **Hijacker** » Fri Jan 16, 2004 11:52 am

dave coleman at SCC was able to pull a .90 on the original suspension to their project 240

Post by **fiznat** » Fri Jan 16, 2004 11:52 am

hm... well Im embarassed to ask, but could someone just quickly explain what those skidpad ratings mean?

Post by **k6kicker** » Fri Jan 16, 2004 11:52 am

yeah it make ssense that scc was able to get a bit higher now due to 10+ years of tire advancement

Post by **Rex** » Fri Jan 16, 2004 11:52 am

fiznat wrote:hm... well Im embarassed to ask, but could someone just quickly explain what those skidpad ratings mean?

A little background on Skippad Testing

And a little about how they measure it.

An interesting story about some skidpad tests (search thru the story for "skidpad")

A nice read about automotive testing.

Post by **Hijacker** » Fri Jan 16, 2004 11:52 am

good point....i never even thought of that :asmile

fiznat- the lateral skid pad rates how fast a car can turn a circle (usually 100 feet or 200 feet). Generally you run the circle as fast as you can without the car going under or over. Then there's a formula that I used to have on me that you use to calculate the G force rating.

Post by **Hijacker** » Fri Jan 16, 2004 11:52 am

thanks rex!

Post by **Rex** » Fri Jan 16, 2004 11:52 am

Intersting how the one article says the same tire on a different width rim delivered different results.

Post by **Hijacker** » Fri Jan 16, 2004 11:52 am

contact patch was bigger i assume. that's the only way i could think that would work

Post by **Nathan** » Fri Jan 16, 2004 11:52 am

Changes the slip angles too I believe <<Nathan spouting crap because he knows little to nothing about tires/rims.

Post by **fiznat** » Fri Jan 16, 2004 11:52 am

hey rex thanks alot for the info!

Post by **littlemilla3** » Fri Jan 16, 2004 11:52 am

tenkawa_akito wrote:good point....i never even thought of that :asmile

fiznat- the lateral skid pad rates how fast a car can turn a circle (usually 100 feet or 200 feet). Generally you run the circle as fast as you can without the car going under or over. Then there's a formula that I used to have on me that you use to calculate the G force rating.

Yeah you're thinking of centripetal acceleration(not centrifugal, which isn't a real force in physics). 1g is one force of gravity, which is 9.8m/s^2. The formula for centripetal acceleration is a=v^2/r. This is the force inward toward the center of the circle. You need to know velocity at point of loss of traction and the radius of the circle you are driving around. You get g force by dividing by 9.8.

Ha never thought physics would come in this handy. I wonder if doing it this way is really that accurate for real life situations.

Post by **JustinM** » Fri Jan 16, 2004 11:52 am

According to my G-Timer I pulled .91 on cooper tires and cut springs. Only for a split second before the tires broke free. Mid .80's are common on stockers.

Post by **crzycav86** » Fri Jan 16, 2004 11:52 am

I think to get an official skidpad reading, you need to keep a certain g-force for 3 seconds or something. It can't just be for a split second. ..that's what I think anyway. I didn't read the articles, but it might say something about it there.

Post by **hadokenny** » Fri Jan 16, 2004 11:52 am

i pulled .89 with my fully loaded s14 with just a strut bar and stock suspension and tires. Havent measured it with my HA coilovers yet.

Post by **mikeG** » Fri Jan 16, 2004 11:52 am

littlemilla3 wrote:1g is one force of gravity, which is 9.8m/s^2.

9.8 m/s^2 is acceleration due to gravity ignoring air resistance. Dork.

littlemilla3 wrote:Ha never thought physics would come in this handy

Staying awake in physics would have been much more beneficial.

Website · Post by **TurboKA37** » Fri Jan 16, 2004 11:52 am

id really like to see what kinda skidpad numbers i can pull with my suspension mods. whats a good computer to measure this sort of stuff that isnt too expensive?

Post by **crzycav86** » Fri Jan 16, 2004 11:52 am

^---G-tech gizmos!

Post by **mikeG** » Fri Jan 16, 2004 11:52 am

turboka37 wrote:id really like to see what kinda skidpad numbers i can pull with my suspension mods. whats a good computer to measure this sort of stuff that isnt too expensive?

A piece of string.

Find a large open parking lot that is flat and level. Pound a nail in the parking lot surface and tie the string (15'11.1''long) to it. Get a can of spray paint. Paint a circle. Holding the string driectly against the can will give you a measure of 15'11.1''. Thusly, as you walk around the nail, you will create a circle with a circumference of 100 FEET. 60 MPH around a 100 foot circle is 1G. Do the math to find what your car is pulling before you break loose. (30 mph=.5g, and so on.)

Post by **Cyberkreig** » Fri Jan 16, 2004 11:52 am

littlemilla3 wrote: 1g is one force of gravity, which is 9.8m/s^2. The formula for centripetal acceleration is a=v^2/r. This is the force inward toward the center of the circle. You need to know velocity at point of loss of traction and the radius of the circle you are driving around. You get g force by dividing by 9.8.

Actualy its -9.8m/s^2. Ignoring air resistance of course. I was confused why you said "force inward toward the center of the circle" isnt it the force outward? The omission of the negative might explain it.. but then we never covered centripital acceleration.

Post by **mikeG** » Fri Jan 16, 2004 11:52 am

Acceleration toward the ground is positive.

Centripetal-acceleration towards the center of a circle or object due to gravity.

Centerfugal-acceleration away from the center of a circle due to inertia.

Post by **Cyberkreig** » Fri Jan 16, 2004 11:52 am

acceleration toward the ground is negative

Skid Pad Rating?

Skid Pad Rating?

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