What's the fastest speed you ever done?
#126
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![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
I haven't tried for that speed. To nervous financially.
And if even 1 RX-8's speedo is off, then you have to assume that more of them are as well, and it throws into doubt anyone who makes a statement outside the accepted range by using their speedo.
#127
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YOURS might be accurate, but most simply are not. On OEM wheels/tires, mine reads roughly 4.5% too high. So I could probably get mine to read 160mph, since 153.1 is within the acceptable range of top speeds ![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
I haven't tried for that speed. To nervous financially.
And if even 1 RX-8's speedo is off, then you have to assume that more of them are as well, and it throws into doubt anyone who makes a statement outside the accepted range by using their speedo.
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
I haven't tried for that speed. To nervous financially.
And if even 1 RX-8's speedo is off, then you have to assume that more of them are as well, and it throws into doubt anyone who makes a statement outside the accepted range by using their speedo.
The speedometer is not as accurate as a GPS, it can easily be off by 3%. If your going "160mph", you're off by 5mph. The GPS will give you the right speed. This is a major issue on motorcycles since thee sensor is on the front wheel (the faster you go, the less accurate it gets), you need a speedo healer to have the correct speed or a GPS when going at high speeds.
#130
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I can test, but I think no. The speedo is already digital, so it probably just grabs that number. The tach, and the speedo in other cars, being analog signal has inherent inaccuracies from the ECU to the display. Taking the number from the ECU removes those additional inaccuracies. I'd bet the Speedo is already from the ECU, and the inaccuracy is between the sensor and the ECU.
#134
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I have had a car timed by the SCTA I had a GPS in the car at the time. It was the microsoft streets and trips GPS this was in 2008. The SCTA required that I do a calibration run at 135 MPH so that they could tell me how far off the speedometer was for the run I was doing. My car read 135, my GPS read 132, the SCTA told me I was doing 131. Now all being that said it was off by 1 MPH but it was still off.
#135
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A 6mph consistent off would mean that he would show 6mph while stopped.
![Squint](https://www.rx8club.com/images/smilies/squint.gif)
#137
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I have had a car timed by the SCTA I had a GPS in the car at the time. It was the microsoft streets and trips GPS this was in 2008. The SCTA required that I do a calibration run at 135 MPH so that they could tell me how far off the speedometer was for the run I was doing. My car read 135, my GPS read 132, the SCTA told me I was doing 131. Now all being that said it was off by 1 MPH but it was still off.
Though 1mph at 135mph is a 0.7% variance, which could easily be explained by rounding and/or timing. For example if your GPS was rounding up, the SCTA rounding down, and maybe they were only 0.1mph different.
I wouldn't use that to say that GPS is off. The SCTA could have been off as well.
In fact, I'd trust the GPS before any other medium, given how accurate the GPS system has to be, and how it works makes speed calculation a cinch, and VERY accurate. The inaccuracies with it typically come about from delays between the processing time and the display time.
#142
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Pivacy there. Think about all the privacy nuts that would go crazy when they heard that "a GPS sensor is installed on their car".
Even ignoring how it's used, and if the data goes anywhere.
Even ignoring how it's used, and if the data goes anywhere.
#145
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119 mph in a 65 mph zone in my 2004 4-speed automatic RX8
I found out my new GPS caught my speed too![Big Grin](https://www.rx8club.com/images/smilies/biggrin.gif)
![](https://sphotos.ak.fbcdn.net/hphotos-ak-ash1/hs776.ash1/166682_1635605844881_1078751899_31599255_6598283_n.jpg)
i live too close to work, so im only on the highway for work two days a week
I found out my new GPS caught my speed too
![Big Grin](https://www.rx8club.com/images/smilies/biggrin.gif)
![](https://sphotos.ak.fbcdn.net/hphotos-ak-ash1/hs776.ash1/166682_1635605844881_1078751899_31599255_6598283_n.jpg)
i live too close to work, so im only on the highway for work two days a week
![Frown](https://www.rx8club.com/images/smilies/frown.gif)
#148
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120 in an 4 speed AT must have taken a while...
I got my top speed urge out when I was younger with the 8. I hit 155-ish. I dont think I'd do something like that again unless it was on a closed course of some sort. I very rarely go over 100 in the S4. Been up to 120 or so but don't really feel the need to go faster. Another S4 with similar mods has hit close to 180, and I have no desire to come close to that.
I got my top speed urge out when I was younger with the 8. I hit 155-ish. I dont think I'd do something like that again unless it was on a closed course of some sort. I very rarely go over 100 in the S4. Been up to 120 or so but don't really feel the need to go faster. Another S4 with similar mods has hit close to 180, and I have no desire to come close to that.
#149
I divide by zero
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In my blown C5 I went over 160mph a couple times.
On my sportbike(fully modded 954rr) I did 185+ indicated many times. Was -1 on the front sprocket though so it was probably a fair bit lower. It so easy on the bike since it gets there so quickly. I've been busted doing 140 on one wheel...that was a fun phone call to the wife...
Not sure the fastest in my Rx8, though I've posted logs of me exceeding 120 on short bursts while testing my turbo.
On my sportbike(fully modded 954rr) I did 185+ indicated many times. Was -1 on the front sprocket though so it was probably a fair bit lower. It so easy on the bike since it gets there so quickly. I've been busted doing 140 on one wheel...that was a fun phone call to the wife...
Not sure the fastest in my Rx8, though I've posted logs of me exceeding 120 on short bursts while testing my turbo.
Last edited by Mawnee; 01-15-2011 at 05:39 PM.