 Max Speed? 132 mph so far, Okay guys seriously.... |
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| Kirmizi |
 Oct 19 2009, 10:50 AM
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#81
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Senior Member  Group: Members Posts: 836 Joined: 12-February 06 From: Wyoming, US Member No.: 5,568 Region Association: None  |
QUOTE I slowed down for the pic. That's funny Demick, I have a cellphone pic just like that titled "Fly Porsche" Mike |
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| SirAndy |
Oct 19 2009, 07:24 PM
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#82
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Resident German Group: Admin Posts: 41,669 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(budman5201 @ Oct 14 2009, 05:31 PM)  whats the fastest someone has been in their stock or modified 914? About ~135mph @ 6800 rpm with a stock 901 (hitting the rev limiter) going uphill climbing the sierras on Hwy 80 from Reno to Tahoe with a fully loaded car and a passenger (coming back from the RRC). (IMG:style_emoticons/default/biggrin.gif) Andy |
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| orange914 |
Oct 19 2009, 11:29 PM
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#83
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
QUOTE(dlestep @ Oct 17 2009, 10:45 AM) clocked @ 75 on a 12 speed...1979...downhill on east side of sierras to hwy 14, extremely tucked and my ass had a death grip on the seat... 105 in explorer near orlando, felt like 80 131 in 911 returning from Sebring 108 in 73 914 75 south 55 with 74 914 (being trailered)...someday, I'll bust triple digit... 95 in wife's Jeep...she'd kill me if she knew...it was a handful... 145 on autobahn in 1971, between Frankfurt and Heidelberg, returning from Frankfurt Fleughaven. Held it for about 15 minutes... afterwards felt like I could get out and push at 35... 15 on roller blades, fell about three times, no more for me... 0.01 on a pogostick...my kids fell down laughing because my pants fell around my ankles. 5.1 with my daughter in the grocery cart at Target...was pulled over by a guy with a red shirt and walkie-talkie... 5,321 on a aluminum disk down a very steep mountain side in the snow... haven't been the same since. funny stuff (IMG:style_emoticons/default/biggrin.gif) i look back and think of the P.O.S. 's i had over XXX m.p.h. and cring |
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| mudfoot76 |
Oct 20 2009, 12:30 PM
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#84
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Currently teenerless :-( Group: Members Posts: 946 Joined: 18-March 04 From: Carmel, IN Member No.: 1,814 Region Association: None |
On the back straight at Mid-Ohio (between Keyhole and China Beach), I was able to reach 6500rpm in 5th with my Raby 2270. According to the tire size and gear ratio calculators on this site, that translates to approximately 135mph. No idea what the speedometer was indicating, but the car felt nice and solid. (IMG:style_emoticons/default/driving.gif)
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| jaminM3 |
Oct 20 2009, 02:19 PM
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#85
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Member Group: Members Posts: 418 Joined: 23-March 07 From: SLC, UT Member No.: 7,619 Region Association: Intermountain Region |
I had my '76 at 110 and that was all it would do on a flat road at about 5000' elevation. I don't think a stock 914 will go any faster, I think non-stock tire/wheel changes screw up the speedo.....
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| Eddie914 |
Oct 20 2009, 02:33 PM
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#86
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Unregistered |
I must be reading the transaxle gear charts wrong. The charts I have, show a stock 901/914 transaxle (A F N V ZD) producing a top speed of 155MPH using 24.3" tall tires at 6750RPM. Andy and Geoff posted that they were at about 135MPH at that RPM.
I have never hit the rev limiter in 5th (my 3.2 only has enough power on the straights at PR or BR to pull about 6,000RPM). I am usually concentrating on hitting the braking points and not watching the bouncing tach needle. Speedometer ... what's that? Eddie |
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| carr914 |
Oct 20 2009, 05:58 PM
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#87
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Racer from Birth Group: Members Posts: 118,917 Joined: 2-February 04 From: Tampa,FL Member No.: 1,623 Region Association: South East States  |
Been Ticket'd @ 125 in a 911. Fastest I've driven 192MPH.
T.C. |
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| naro914 |
Oct 20 2009, 06:37 PM
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#88
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Losing my mind... Group: Members Posts: 2,476 Joined: 26-May 06 From: Charlotte, NC Member No.: 6,073 Region Association: South East States |
143 mph on the back straight at Road Atlanta and Papa Smurf felt perfectly smooth.
I know the speed because I had a friend in a 996 run with me and tell me the top speed we hit - though I swear I was pulling away from him (IMG:style_emoticons/default/smile.gif) FWIW, my speedo is pretty accurate - it said 140ish... |
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| john rogers |
Oct 20 2009, 07:15 PM
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#89
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Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
The only way to tell is to get a GPS unit that can record top speed, make sure to reset it before use and stuff it under the seat. I would hazard a guess that a 914 speedometer is not very accurate since it is mechanical, had a huge cable and a really sucky drive off the rear of the gear box?! I have found gearing charts with tire sizes (diameter, etc) to start dropping accuracy once you get over 70 to 75 MPH. Goodyear used to post the revolutions per mile of their racing tires at various speeds up to whatever they were rated for. As I had imagined, the cantilever slicks changed very little due to the stiff side walls, but some of the older models would change quite a bit. Now of course everyone races with those rubber band tires that have nearly no sidewalls for flexing.
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| mudfoot76 |
Oct 21 2009, 09:16 AM
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#90
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Currently teenerless :-( Group: Members Posts: 946 Joined: 18-March 04 From: Carmel, IN Member No.: 1,814 Region Association: None |
QUOTE(Eddie914 @ Oct 20 2009, 04:33 PM) I must be reading the transaxle gear charts wrong. The charts I have, show a stock 901/914 transaxle (A F N V ZD) producing a top speed of 155MPH using 24.3" tall tires at 6750RPM. Andy and Geoff posted that they were at about 135MPH at that RPM. I presume my gearbox is stock, but I honestly have no idea what gear stacks are in there. According to the gear charts and tire size, my track tires are 23.1" tall. Never thought about measuring. Now my curiosity is piqued - I'll try the GPS next time I'm at the track. |
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| VaccaRabite |
Oct 21 2009, 08:22 PM
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#91
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En Garde! Group: Admin Posts: 13,456 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
I had mine all the way to 85 (GPS) tonight. It had a lot more to go, but I did not. Just passing a truck on 83. Got there faster then expected, actually. This is going to be a fun car when I actually get carbs dialed in and the exhaust made more better.
Zach |
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| SirAndy |
Oct 21 2009, 09:14 PM
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#92
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Resident German Group: Admin Posts: 41,669 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Eddie914 @ Oct 20 2009, 12:33 PM) I must be reading the transaxle gear charts wrong. The charts I have, show a stock 901/914 transaxle (A F N V ZD) producing a top speed of 155MPH using 24.3" tall tires at 6750RPM. Andy and Geoff posted that they were at about 135MPH at that RPM. Mhmmmm. I just looked at my gear chart and you're right. According to the chart, i'm running a MSX box ... (IMG:style_emoticons/default/WTF.gif) Andy |
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| VaccaRabite |
Oct 22 2009, 08:34 AM
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#93
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En Garde! Group: Admin Posts: 13,456 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
QUOTE(SirAndy @ Oct 21 2009, 10:14 PM) QUOTE(Eddie914 @ Oct 20 2009, 12:33 PM) I must be reading the transaxle gear charts wrong. The charts I have, show a stock 901/914 transaxle (A F N V ZD) producing a top speed of 155MPH using 24.3" tall tires at 6750RPM. Andy and Geoff posted that they were at about 135MPH at that RPM. Mhmmmm. I just looked at my gear chart and you're right. According to the chart, i'm running a MSX box ... (IMG:style_emoticons/default/WTF.gif) Andy Gearing charts lie. They don't take into account friction from road surface, drag, or any of the other factors that dictate actual top speeds. The faster you go, the more drag becomes an issue. Your actual speed is going to be increasingly wrong (slower and slower) compared to the gearing chart as speed increases due to drag increasing at a faster rate. I know I'm not saying this well, perhaps someone more versed with physics or engineering can step in. Zach |
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| Cupomeat |
Oct 22 2009, 08:44 AM
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#94
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missing my NY 914 in VA Group: Members Posts: 1,336 Joined: 26-November 07 From: Oakton VA Member No.: 8,376 Region Association: MidAtlantic Region |
Zach,
I don't understand what you are trying to suggest with your last post. Gear charts do not lie, and if you are going a specific RPM with a particular size tire, in the same final drive and gear ratio, you will all be doing the same speed. Certainly, the ability of an engine to push the car to those speeds (given power and torque multipliers of the gearing and such) are an issue, but speed at gear at RPM is a constant... ...unless your tires grow in diameter or something is slipping. Yes, drag losses due to tires and gearbox are pretty constant throughout the speed range, where aerodynamic drags grows exponentially due to speed. I hope that helps. OR, and a BIG OR, I didn't understand what you are trying to say. |
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| SirAndy |
Oct 22 2009, 11:11 AM
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#95
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Resident German Group: Admin Posts: 41,669 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Vacca Rabite @ Oct 22 2009, 06:34 AM) Gearing charts lie. They don't take into account friction from road surface, drag, or any of the other factors that dictate actual top speeds. The faster you go, the more drag becomes an issue. Your actual speed is going to be increasingly wrong (slower and slower) compared to the gearing chart as speed increases due to drag increasing at a faster rate. I know I'm not saying this well, perhaps someone more versed with physics or engineering can step in. No. Friction and drag make it harder for a car to get to a certain speed, but if your engine is turning a certain rpm and you have a certain gear ratio and tire size, your speed will be exactly what the gear chart predicts. Some cars just get to that point faster than others. (And some may never get there (IMG:style_emoticons/default/smile.gif) ) (IMG:style_emoticons/default/shades.gif) Andy |
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| charliew |
Oct 22 2009, 12:11 PM
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#96
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Advanced Member Group: Members Posts: 2,363 Joined: 31-July 07 From: Crawford, TX. Member No.: 7,958 |
A thought just occured to me in this discussion. If the fully aired up tire is 24.0 inches tall what if you let some air out and it's only now 23.0 inches tall. It's still the same diameter so the revolutions would be the same but the distance from the axle center to the ground is less. Sooo therotically the fd would be a slightly lower ratio and you would accelerate quicker but the calculated speed would stay the same.
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| SirAndy |
Oct 22 2009, 12:52 PM
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#97
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Resident German Group: Admin Posts: 41,669 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(charliew @ Oct 22 2009, 10:11 AM) It's still the same diameter Nope. Fully inflated it would be a nice round circle at a radius of 12". Under-inflated the effective radius of the circle is the distance from the axle center to the ground, in your example 11.5". (IMG:style_emoticons/default/shades.gif) Andy |
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| charliew |
Oct 22 2009, 12:54 PM
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#98
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Advanced Member Group: Members Posts: 2,363 Joined: 31-July 07 From: Crawford, TX. Member No.: 7,958 |
Bad terminology I meant circumferance.
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| SirAndy |
Oct 22 2009, 01:01 PM
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#99
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Resident German Group: Admin Posts: 41,669 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(charliew @ Oct 22 2009, 10:54 AM) Bad terminology I meant circumferance. I know. My post above still applies. The circumference of the tire is irrelevant as it is deformed when under-inflated. The important part is the circumference of the circle described by the radius from the axle center to the ground. That is your effective circumference. On a fully inflated tire, it just happens to be the same as the circumference of the tire. (IMG:style_emoticons/default/bye1.gif) Andy |
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| Sleepin |
Oct 22 2009, 01:25 PM
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#100
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Advanced Member Group: Members Posts: 3,647 Joined: 20-November 07 From: Grand Junction, Co. Member No.: 8,357 Region Association: Rocky Mountains |
Was pulled over for doing 95 in a 40 zone once (not in a 914)...no ticket.... (IMG:style_emoticons/default/biggrin.gif) .....the badge in my wallet helped me out with a verbal warning.
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