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How fast have you gone; in your metro?
Topic Started: Oct 14 2012, 03:13 AM (7,664 Views)
brsja
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My son just got a ticket for 15 over...
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Metromightymouse
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Powdercoat Wizard

Frame that, it never happens, cops just laugh.

Well, unless it was 40 in a 25...
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Old Man


.
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myredvert
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myredvert

clarkdw
 
5th gear is not 1:1 it is 0.757 OD so 6884 X 0.757= 5211 rpm
Thanks Clark, I had a feeling that I was leaving something out, just completely brain dead today and not able to see it. :smackface
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UncleBranton
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Back in 1993 going down I75 in a new 93' Metro 3/5. My friend and I wanted to know if this little car would hit 100mph and be worthy of being called a car (as compared to my 1966 Oldsmoblile Delta 88 w/ 425 ultra high compression super rocket 370hp :nfs ). Well we pegged the needle and still had peddle left and it didn't sound like it was straining at all, rode like a new car :rofl as always some one wants to help you out and keep you in the fast lane (passed by a Metro, not happening :ermm: ). After a few miles the guy gave up and let us go, later while at a rest area the same guy pulls up beside us and wants to know if the metro is factory because if they go that fast off the floor he wants one! I told I've only had it a couple of weeks and we were testing it out. No mods just brand new. He said he was going 100mph and we left him behind. :cheers :boink :congrats :worthy . I've been in love with Metro ever since. :cloud9 :wub: :drool
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nwgeo


t3ragtop
Nov 22 2012, 04:03 AM
126 mph, gps verified, in a vert with a dohc g13 and a 4.39:1 transmission.

120 mph registration on a gt speedo.

it didn't take long to get there, either.
Scary that fast in a vert. :oshit
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Car Nut
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:shake Sounds like a death wish in a vert. Any Metro actually. :lol Don't think I've had mine over 70.
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t3ragtop
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Turbo3 and Twincam Tweaker

hey guys, my verts aren't rattle trap death machines. for the most part they are better than new. the only thing that gives me any pause is that it's hard to find tires that are rated for speeds above 115.

back to the gps discussion, you have to understand the technology that's involved. gps isn't looking at a satellite, it looks at the gps satellite constellation which puts between 5 to 7 satellites in it's frame at any given time. to say that gps doesn't work effectively with a cloud in the sky is a stretch and pretty much untrue most of the time.

gps is a very effective way of determining a rate of speed and you'd be hard pressed to find any aircraft that doesn't rely heavily on gps speed information. gps completely removes mechanical unreliability, friction, gear ratios, tire diameter, etc. from the equation and unless you have a defective gps set you can trust it's information more than a mechanical speedometer.

there are different levels of accuracy for gps and several different layers of information. some of the positioning equipment i use is accurate to within 6 inches. consumer grade gps is usually accurate to 3 feet. overall, i would trust a gps generated rate of speed over any mechanical speedometer. the suzuki speedos are usually on the ambitious side and most accurate within the halfway point of their registration. if your speed goes to 85 it is most accurate at 42. if your speedo goes to 120 it is most accurate at 60 mph. that's a common mode for all analog gauges.

i would challenge anyone who says that gps is inaccurate or so glitchy that it would lose the signal from 5 to 7 satellites from the gps constellation of satellites. gps is over engineered to retain accuracy. if it was that flakey, the aeronautical industry and the military wouldn't be using it. ;)
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yiffzer
Forgot His Manpurse

I saw my GPS (on the Garmin) claim I was going 62 when I was going 55 with the wrong type of speedometer. With my upgraded wheels (13 inch instead of 12), I multiply 1.06 with the speed. So 55 would mean 58.3 MPH. Yet the GPS tells me I'm going to 62.

Not sure who to trust.
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doviatt
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Trust t3ragtop on this one and rely on the GPS info.
One thing some don't consider when trying to calibrate mechanical speedometer is that the speed and odometer can also vary from each other.
When I figured out my offset for my odometer I went through a long process to be accurate.
I've used 2 different GPS units one was aviation precision. I also use google maps. I used this to get my daily commute as close as possible. I get 3 numbers (2 gps and 1 map) to be the same and I've got a good accurate distance. Do this over multiple days and when they all agree I'm set. Then I see what the odo says and calculate the offset. This is where I figured out the offset doesn't apply equally to my speedometer.
Edited by doviatt, May 21 2014, 11:00 AM.
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t3ragtop
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Turbo3 and Twincam Tweaker

you really can't just say, "i have 13" wheels so i used the 1.06 variable...."

you can mount 80 series tires on a 12" wheel and 60 series tires on a 14" wheel and end up with total tire diameter within a negligible margin.

one of the points i was making in my other post was exactly that. the speedometers in suzuki cars make an okay "indication" of speed but outside of their very close band of accuracy they are misleading.

when i was travelling with geo glenn, scoobs, and mythstae to geopalooza 2011 (i think) i had my vert wound up around 70 mph and glenn told me i was running much faster. after confirming speeds with gps i operate differently. at 60 mph indicated i am running about 66 mph.

the inaccuracy also throws off mileage calculations. if i drive an indicated 60 miles i am actually covering 66 miles. the odometer has clicked off 60 miles but i should really be calculating 66 miles divided by fuel used.

the biggest reason for the wierdness in the speedometer is that the sensing device is a wire spring with a magnet attached. the cable drives a hub with a magnet glued into the drum. that spins by the magnet on the spring and the motion of the spring turns the needle shaft causing the needle to deflect and point to some speed.

sitting in the sun for 20+ years under the hot dash has pretty near cooked those magnets and made them weaker.

i did a full on, in depth research study on magnetic field flux propagation when i was developing the hall effect technology mods for my monster turbo3 engines and i'll tell you that 2 magnetic fields make a pretty odd flux map.

by the way, the magnet on the speedo hub also triggers the vss switch in the instrument cluster. the fixed proximity of the vss reed switch along with a weakened magnetic field can make for some pretty odd deceleration problems.

there is one instrumentation shop in columbus that repairs and recalibrates automotive gauges. i used to have them do the old lucas, rootes group, and bosche instruments i used in restorations on european cars. that poor old shop has been sucking it's last gasps ever since digital gauges and throwaway speedometers became the deal.

i don't know that i'd even bother with trying to have suzuki cluster repaired.

a good rule of thumb woul be to try to source your replacement clusters from as far north as you could. northern cars rust out faster and the winter cold would probably make the magnets stronger. ;)
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rjsdotorg
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R E Member

I've used GPS apps on the iPhone and they are very accurate for delta measurements (like speed) less for absolute position due to atmospheric oddities.

Calc out your speed via trans ratios and your tire diameter.
Ratios: http://themetrowiki.wikispaces.com/Transmission
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t3ragtop
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Turbo3 and Twincam Tweaker

the cell phone gps apps have the least positional accuracy. that's a user gizmo. the phones themselves use blue shift technology that is highly accurate to locate a phone among towers. it just can't be accessed by a user.

i'm not a big phone guy. i have one that i talk on. i don't text or navigate. i only have it so i can get those money maker calls for emergency overtime. ;)

i use an acer netbook with a usb gps antenna on my dash. the computer has a 9" display with better native video than a phone or garmin type gps. i don't really use it for anything except driving up to geopalooza. :D
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rjsdotorg
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R E Member

yes, absolute positional accuracy is weaker than Garmins, but differential is similar, and faster acquisition...
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nerys
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Grr

my best speed in my 94 xfi rated for max 87mph with oversized tires (155 80 13 stock 12) is 94mph GPS verified.

I tried hitting 100 it simply could not do it not even with a very very slight downgrade. the "VERY" slightest upgrade ie one I could not even see visually was enough to start the speed ticking downward :-)


hahahahaha after all these years it just hit me that I did 94 in my 94. hahahahaha
Edited by nerys, May 21 2014, 12:11 AM.
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