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      04-03-2012, 06:15 AM   #23
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Quote:
Originally Posted by clived View Post
So, stock clutch, and you're just sliding your foot off it?
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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Quote:
Originally Posted by ianf View Post
Clivedh's basis that there is wheelspin @ 100km/h of perfect dry surface causing incorrect V reading is amusing.
I agree, for a non-tuned N54 to spin its wheels at 100km/h in 2nd gear with good tires and on dry concrete would be quite a feat unless you were already spinning the tires. In that case the time would have been in the 2-3 second range.

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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Quote:
Originally Posted by clived View Post
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 ;-)
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, 04:13 PM   #34
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^^^Wow. Sub 4 seconds. Thats GT3 RS4 territory.
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      04-21-2012, 04:19 PM   #35
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Quote:
Originally Posted by MrRoboto View Post
^^^Wow. Sub 4 seconds. Thats GT3 RS4 territory.
On 18's with a higher profile I can run 3.7X-3.8X all day.
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      04-28-2012, 06:46 PM   #36
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Quote:
Originally Posted by bdaddylo View Post
If speed is not calculated from the rear wheels which I'm pretty sure it isn't...
Where do you think it is calculated from? I guess the P3 guys would know, unless they'd say "from the genuine speed data on the ODBII port" in which case we'd need to understand which sensor drives that value on the bus.

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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Last edited by clived; 04-28-2012 at 06:54 PM..
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      04-28-2012, 07:57 PM   #37
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Quote:
Originally Posted by Artemis View Post
CDV delete = Clutch Delay Valve delete (modification)
http://www.1addicts.com/forums/showthread.php?t=558362
I thought all M cars came without the CDV?
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      04-28-2012, 08:14 PM   #38
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Quote:
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I thought all M cars came without the CDV?
Well, I just went to that thread and answered my own question! I was one of the E90 M3 guys that thought I didn't have one!!!
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      04-29-2012, 01:46 AM   #39
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Quote:
Originally Posted by BMW86
Quote:
Originally Posted by MrRoboto View Post
^^^Wow. Sub 4 seconds. Thats GT3 RS4 territory.
On 18's with a higher profile I can run 3.7X-3.8X all day.
Your car BMW86 seems to be right hand drive? Whitch country do you live in?
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      04-29-2012, 01:47 AM   #40
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Quote:
Originally Posted by Adriansideways View Post
Your car seems to be right hand drive? Whitch country do you live in?
I come from the land down under... Australia
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      04-29-2012, 01:58 AM   #41
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Mm almost thought ure a mate of mine with a white 1M that lives in South Africa!!
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      04-29-2012, 02:23 AM   #42
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Originally Posted by Adriansideways View Post
Mm almost thought ure a mate of mine with a white 1M that lives in South Africa!!
Lol nope I'm other side of the world!
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      05-09-2012, 10:56 PM   #43
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Quote:
Originally Posted by clived View Post
Where do you think it is calculated from? I guess the P3 guys would know, unless they'd say "from the genuine speed data on the ODBII port" in which case we'd need to understand which sensor drives that value on the bus.

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.
Okay, I did a few runs with an AIM Solo and below is my best time. I didn't have the best launch so I feel I can shave off 0.1 - 0.2 seconds. As you suspected, the P3 seems to be reading rear wheel speed including slippage. All of my runs were done with traction control turned off.
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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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