04-03-2012, 06:15 AM | #23 |
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Yep, lucky shot apparantly but i can tell you one thing, after a few attempts she was smelling
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04-19-2012, 11:39 PM | #24 |
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My friend turned in this impressive time from his P3 vent guage.
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04-20-2012, 02:44 AM | #25 |
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I don't think we should rely on gauge times - that just tells you how long it took the wheels to get spinning to that speed, not what the 0-60mph velocity time was. On ice I recokon I could beat that on the gauge, not on GPS ;-)
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04-20-2012, 03:41 AM | #26 |
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...and the speedo over-reads, so real speed was even lower.
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04-20-2012, 06:52 AM | #27 |
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Hey Ian, I haven't used the speedometer for rapid acceleration but when cruising at speed, the needle seems to over-read compared to GPS (Harry's Lap Timer) eg needle approximately 210km/h corresponds to GPS approximately 200km/h.
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04-20-2012, 08:17 AM | #28 | |
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P3 states that their guages display actual/uncorrected speed. Don't get me wrong, I'm not vouching for the accuracy of the 0-60 mph function on the P3.
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04-20-2012, 08:42 AM | #29 |
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Aren't the speed sensors & gauge results based on front wheel rotation? Who knows precisely where the physical sensors are situated?
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04-20-2012, 10:36 AM | #30 |
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ianfh, (I thought I'd add an 'h' as it seems to be the in thing ;-) - you've misunderstood me somewhat. What I was trying to get across was that to get a good number on the vent you could sit on the dyno, spin the wheels up to 60 and say "wow, look at my great 0-60 time", in a way that with a Vbox you just can't do - therefore I personally would put much less stock into a gauge reading than a vbox reading.
Fair point on the speedo lagging, although of course neither of us really knows exactly where the combo of lag and over-read leaves us - maybe at slower speeds it ends up spot on :-) Was the car the gauge reading came from standard? Is there a correspondng verified Vbox measured 0-60 that verifies the accuracy? Has anyone done that test at all? |
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04-21-2012, 06:12 AM | #31 |
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I don't recall doubting your 4.5. It's the 4.34 posted above I'd like to see verified by Vbox. I think you're missing the order of the posts, not me missing the point - I raised my question before you posted your time.
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04-21-2012, 02:18 PM | #32 |
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I contacted P3 regarding this question and they stated that they used a Vbox as a baseline to calibrate the 0-60 feature. The speed reading is straight from the ECU. If speed is not calculated from the rear wheels which I'm pretty sure it isn't as I don't recall seeing the speedometer jump as the RPMs do when the rear wheels are spinning, then I would guess that the P3 has an accuracy of +/- 0.05 sec. The P3 gauge is very consistent, so I trust that the 4.34 +/- 0.05 sec is not an anomaly. The key is all in the launch and shift point. You can't spin the wheels at the start and you need to make your 1-2 shift before the engine loses a significant amount power which for a stock 1M is around 6k rpm.
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04-21-2012, 03:32 PM | #33 |
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Car had an exhaust leak so I tested the p3 after it was sorted.
JB4 Map 2 FBO (no meth) on 19s w/ 30 profile. This was 0-100km or 0-62mph. Low 4.** on stock 1M is very achievable. |
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04-21-2012, 04:19 PM | #35 |
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04-28-2012, 06:46 PM | #36 | |
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I should add I really like the gauge and would seriously consider fitting one - I just want to understand exactly how it's calculating these figures so as to understand under what circumstances it can be relied on and when it might be less accurate than a GPS derived result. Currently I believe that I could sit on the dyno and make the gauge show nonsense figures in a way that a Vbox can't be manipulated. Additionally a verified VBox run will have altitude and therefore incline, validated and there is no way a P3 reading can give us that. Absolutely not casting doubt on any of the figures posted here, just airing my concern that for those wishing to manipulate apparent times, the P3 gauge would be the weapon of choice.
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04-28-2012, 07:57 PM | #37 | |
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04-28-2012, 08:14 PM | #38 |
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04-29-2012, 01:46 AM | #39 |
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04-29-2012, 01:47 AM | #40 |
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04-29-2012, 02:23 AM | #42 |
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05-09-2012, 10:56 PM | #43 | |
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05-10-2012, 06:56 AM | #44 |
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I did my record run on MDM. Your time is really fast if i see how "slow" you take off. I did 0-60 km/h in 1.8 s , if you can cope with this time you will be not far from 4,0
I'll do some new measurements any moment. More power + Michelin PSS must set a new record! Stay tuned
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