 How many lateral G's will a 914 pull? |
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| Tobra |
 Mar 19 2006, 09:44 AM
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#1
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Senior Member  Group: Members Posts: 1,453 Joined: 22-August 05 From: Sacramento, CA Member No.: 4,634  |
I was talking to a friend who I had taken for a ride, and he was pretty impressed with how hard I could pin his shoulder to the seatbelt going around a corner. Anyone have one of those accelerometers and can tell me about how much lateral acceleration a 914 on street tires can attain? Stupid question I know, but inquiring minds want to know. I want one of those things, but my war chest is a bit depleted for the car right now, since I just dropped more on my stray dog's knee than I have in the car at this point.
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| d914 |
Mar 19 2006, 09:59 AM
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#2
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Advanced Member Group: Members Posts: 2,331 Joined: 12-July 03 From: Atlanta, ga Member No.: 904 Region Association: South East States |
The GPR 914 in the "g's" competion a few years back pulled about 1.1 and .9 going left and right. Not fully set up or coner balanced...This is from a questionable memory...getting old (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
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| Dead Air |
Mar 19 2006, 10:03 AM
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#3
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Senior Member Group: Members Posts: 1,268 Joined: 9-May 04 From: Buffalo, NY Member No.: 2,042 |
I bet Gustl or Jaroon will have a copy of a R&T or Car and Driver article somewhere that has the skidpad #'s.
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| Tobra |
Mar 19 2006, 10:14 AM
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#4
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Senior Member Group: Members Posts: 1,453 Joined: 22-August 05 From: Sacramento, CA Member No.: 4,634 |
I remember that, BF Goodrich tires on that one, but if I recall correctly, it had a nowhere near stock suspension on it. |
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| Garland |
Mar 19 2006, 10:14 AM
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#5
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Restoration Fanatic Group: Members Posts: 1,329 Joined: 8-January 04 From: ......Michigan...... Member No.: 1,535 Region Association: Upper MidWest 
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About 8.7 as I recall
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| lapuwali |
Mar 19 2006, 11:16 AM
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#6
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743  |
It's going to depend almost entirely on the tires. "Street tires" covers a lot of ground. You'll do a lot better with something like Falkens summer tires than you will with M&S tires.
15 years ago, AX tires were already good enough that most cars that used them could do over 1G. I regularly recorded 1.1-1.2G on my Honda CRX with Yoko A008RS AX tires in the early 90s, using a G-Analyst. The same car with Yoko A509 street tires couldn't do any better than 0.93. On the stock OEM tires, it was more like 0.85. Tires make a BIG difference, even with identical suspensions. On a skidpad, shocks and spring rates will make almost no difference to G limits. Tires will be 98% of that, with alignment and weight distribution making up the remaining 2%. |
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| jsteele22 |
Mar 19 2006, 01:11 PM
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#7
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Senior Member Group: Members Posts: 727 Joined: 24-August 05 From: Colorado Springs, CO Member No.: 4,653 |
I'd guess that when you lose traction and smack into the guardrail you're good for 15 or more..... (IMG:http://www.914world.com/bbs2/html/emoticons/mueba.gif) BTW, my Saab has a feature that lets you "measure" lateral G's. When I swing hard around a corner, a warning message pops up : "Washer Fluid Low". |
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| Jeff Nelson |
Mar 19 2006, 01:43 PM
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#8
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Newbie Group: Members Posts: 31 Joined: 27-July 05 From: Santa Rosa, CA Member No.: 4,487 |
Per Car and Driver April 1988, 0.84g on a 300-ft diameter skidpad. This car was running Goodrich 185/70 Euro T/As, no mention of the suspension. This same car was timed at 8.6 seconds for 0 to 60mph, stock 2liter motor.
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| SirAndy |
Mar 19 2006, 02:18 PM
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#9
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Resident German Group: Admin Posts: 41,638 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) my goodyear schlicks have enough stick to flip the car over in a turn. not sure how many Gs that would be, but it is scary ... car didn't slide a bit, even on two wheels, made it through the corner OK ... (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) Andy Attached image(s) 
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| jsteele22 |
Mar 19 2006, 02:49 PM
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#10
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Senior Member Group: Members Posts: 727 Joined: 24-August 05 From: Colorado Springs, CO Member No.: 4,653 |
So thats why they call you sir ! |
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| Flat VW |
Mar 19 2006, 03:31 PM
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#11
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Illegal Soapbox Derby Racecar Group: Members Posts: 1,692 Joined: 13-November 04 From: Phoenix, AZ Member No.: 3,105 |
About 8 G's when struck by a mini-van travelling 50 MPH. (IMG:http://www.914world.com/bbs2/html/emoticons/lol2.gif)
John (IMG:http://www.914world.com/bbs2/html/emoticons/wavey.gif) |
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| bryanc |
Mar 19 2006, 04:00 PM
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#12
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Member Group: Members Posts: 321 Joined: 9-August 04 From: San Antonio, Tx Member No.: 2,495 Region Association: Southwest Region |
Welcome back John! |
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| groot |
Mar 20 2006, 10:23 AM
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#13
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Dis member Group: Members Posts: 896 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
This doesn't answer your question regarding street tires, but here's a plot from my car at Mid-Ohio on race tires.... 2nd Qualifying session for the 2005 Runoffs.
Peaks of 1.5 gs, sustained 1.45 gs. Attached image(s) 
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| Howard |
Mar 20 2006, 10:33 AM
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#14
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Incontin(g)ent Member Group: Benefactors Posts: 5,785 Joined: 24-July 03 From: Westlake Village, CA Member No.: 943 Region Association: None
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(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) And you win the best avatar award. (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif) Great 914club thread. Half humor, half solid info. |
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| Joe Ricard |
Mar 20 2006, 10:38 AM
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#15
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
Red Neck Racer pulled 1.4 lateral on New A3S04's on a particulary fast autocross course.
Can't hardly squeak out a "HOLy shh t" before you are thrown the other way for a repeat. |
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| URY914 |
Mar 20 2006, 10:51 AM
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#16
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,598 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
I think I'll hit about 6 g's next time out. (IMG:http://www.914world.com/bbs2/html/emoticons/w00t.gif)
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| Joe Ricard |
Mar 20 2006, 10:55 AM
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#17
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
Yea Paul but 6 time hardly nuthin ain't that much. (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) |
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| groot |
Mar 20 2006, 11:19 AM
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#18
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Dis member Group: Members Posts: 896 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
Slightly off-topic.... but interesting (to me, at least)
A discussion of peak vs. sustained gs. I took some data last week on the 200 foot circle on a competitors vehicle to determine maximum lateral adhesion (you know... the number all the magazines report). Attached is 5 seconds of data, 6 runs (3 in each direction). The point is.... peak is a curious number and could have more to do with a slight bump or something else. We report this average as .793 gs, but the peaks are as high as .87 gs. Attached image(s) 
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| johannes |
Mar 31 2008, 06:11 AM
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#19
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Club Porsche 914 France President Group: Members Posts: 3,084 Joined: 13-January 06 From: France Member No.: 5,409 Region Association: France |
 This is what I found on a 1973 french brochure ... They mesured 0,83 g on a skidpad (diameter 190m). And I presume this was achieved with the thin 165 tyres.  |
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| crash914 |
Mar 31 2008, 08:21 AM
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#20
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its a mystery to me Group: Members Posts: 1,826 Joined: 17-March 03 From: Marriottsville, MD Member No.: 434 Region Association: MidAtlantic Region |
0.97 with falkens....205 50 15. suspension is not stock though....
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