Rogue Tuning: DME tuning, logging, and diagnostics
05-29-2012, 02:18 PM
#78
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Very impressive work.
05-29-2012, 08:11 PM
#79
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Joshua,
What sampling rate can your logger achieve per channel? That is the problem I have run into with the LM-2 which IIRC is only around 12hz - hence log knocking is not possible.
My knock counter utilises a transistor as a switch connected to the knock yes/no 5v pulse feed and reads at 250hz. This sampling rate appears satisfactory to count knock events, but is on the lower side of what is effective. The "ignition rate" is around 217hz at 6500 rpm, so this would seem to be the lower limit.
Of course, we do not know what the duration of the pulse from the DME knock signal is i.e. is it held for 1/2 of a revolution (1 ignition cycle)? We can only guess that the original Bosch Testers (hammers) had a fairly low sampling rate and therefore the duration would have been maximised in the DME circuitry.
What sampling rate can your logger achieve per channel? That is the problem I have run into with the LM-2 which IIRC is only around 12hz - hence log knocking is not possible.
My knock counter utilises a transistor as a switch connected to the knock yes/no 5v pulse feed and reads at 250hz. This sampling rate appears satisfactory to count knock events, but is on the lower side of what is effective. The "ignition rate" is around 217hz at 6500 rpm, so this would seem to be the lower limit.
Of course, we do not know what the duration of the pulse from the DME knock signal is i.e. is it held for 1/2 of a revolution (1 ignition cycle)? We can only guess that the original Bosch Testers (hammers) had a fairly low sampling rate and therefore the duration would have been maximised in the DME circuitry.
I'm assuming you are talking about the S/S2 here...? I don't want to get too far from the 951 stuff in this thread as the S2 stuff is a bit different. Current logging rate for the 951 logger is 12-15hz. That isn't the rate that the DME is reading the info, rather, that is the rate of the logging side. Yes, the knocking signal is very fast, however, we can capture it, and feed the logger the data when necessary.
05-29-2012, 08:21 PM
#80
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WOW awsome man. Great to see a "VENDOR" sharing info and making it public. Unlike some other vendors on here...... When i called josh when i was helping out a lister he was super helpful and did not ask me where i got his product or when or if i was the original owner blah blah blah.
Very nice to see some actual technology and R&D still being done and the best of all not at our expense.
Very nice to see some actual technology and R&D still being done and the best of all not at our expense.
Thanks! We need a "peer-pressure" smiley...
Thank you.
05-29-2012, 08:30 PM
#81
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You guys are getting ahead of me.... so catch me up with some M-tune install questions...
1) what the heck is that red wire coming out of the side of the M tune/AFM connector for - it has a spade but where does it connect to?
2) On the jumper plug, I get it that it to switch fuel maps but which is which? No jumper installed means pump gas or do I have it backwards?
My customer just dropped the car off and sent me the M-tune box, I may have missed some paperwork somehow....Bruce
1) what the heck is that red wire coming out of the side of the M tune/AFM connector for - it has a spade but where does it connect to?
2) On the jumper plug, I get it that it to switch fuel maps but which is which? No jumper installed means pump gas or do I have it backwards?
My customer just dropped the car off and sent me the M-tune box, I may have missed some paperwork somehow....Bruce
05-29-2012, 08:49 PM
#82
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Bruce, you are always welcome to call me...
The long wire from the plug-n-play harness goes to the stock cycling valve plug. It is a +12volt switched power source:
The jumper plug:
no jumper = pump fuel.
jumper on = secondary map.
The long wire from the plug-n-play harness goes to the stock cycling valve plug. It is a +12volt switched power source:
The jumper plug:
no jumper = pump fuel.
jumper on = secondary map.
05-29-2012, 08:55 PM
#84
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Eric,
I'm assuming you are talking about the S/S2 here...? I don't want to get too far from the 951 stuff in this thread as the S2 stuff is a bit different. Current logging rate for the 951 logger is 12-15hz. That isn't the rate that the DME is reading the info, rather, that is the rate of the logging side. Yes, the knocking signal is very fast, however, we can capture it, and feed the logger the data when necessary.
I'm assuming you are talking about the S/S2 here...? I don't want to get too far from the 951 stuff in this thread as the S2 stuff is a bit different. Current logging rate for the 951 logger is 12-15hz. That isn't the rate that the DME is reading the info, rather, that is the rate of the logging side. Yes, the knocking signal is very fast, however, we can capture it, and feed the logger the data when necessary.
You may have better luck than me at this - it will be interesting to see.
05-29-2012, 10:23 PM
#85
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Eric, I can definitely capture every knock event...
Don't confuse logger update frequency with sampling rate - two separate systems (logger vs sampler)
I.E. The DME will sample the MAF voltage at 100hz, obviously the logger gets data slower, but that doesn't mean the DME misses anything.
Don't confuse logger update frequency with sampling rate - two separate systems (logger vs sampler)
I.E. The DME will sample the MAF voltage at 100hz, obviously the logger gets data slower, but that doesn't mean the DME misses anything.
05-30-2012, 03:02 AM
#86
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Awesome - I'll put in my order for an S2 one now 
Seriously though, are you intending to develop an S2 version to this level? Being able to log knock vs timing vs boost would be extremely useful.
PS - I was referring to the LM-2 that will only sample (and log) at 12hz. Obviously you are sampling the knock signal at a higher rate.
Seriously though, are you intending to develop an S2 version to this level? Being able to log knock vs timing vs boost would be extremely useful.PS - I was referring to the LM-2 that will only sample (and log) at 12hz. Obviously you are sampling the knock signal at a higher rate.
Last edited by Eric_Oz_S2; 05-30-2012 at 04:14 AM.
05-30-2012, 07:36 AM
#88
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Make sure you double back the wire on top of the factory harness and put a wire tie on them. That way it doesn't pull out the spade lug if you pull on it.
05-30-2012, 07:42 AM
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05-30-2012, 12:21 PM
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