NOTORIOUS VR
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« Reply #15 on: April 16, 2012, 06:46:56 AM »
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Do it. You wont.
oh I will  I received my BEL harness and ECU yesterday, I have a spare S4 harness that I will use to merge the fusebox plugs with and then I need two more FSI coils and some time to do the modifications and swap. I'm hoping to have my HPX sensor this week as well, just need to build an intake arm for it that I can weld the sensor bung to. Now I just have to get a 3 or 4 BAR Bosch MAP sensor that fits in the stock TTB location. Do you have any part no's by chance? |
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Gonzo
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« Reply #16 on: April 16, 2012, 06:48:32 AM »
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oh I will I received my BEL harness and ECU yesterday, I have a spare S4 harness that I will use to merge the fusebox plugs with and then I need two more FSI coils and some time to do the modifications and swap. I'm hoping to have my HPX sensor this week as well, just need to build an intake arm for it that I can weld the sensor bung to. Now I just have to get a 3 or 4 BAR Bosch MAP sensor that fits in the stock TTB location. Do you have any part no's by chance? Sweeeeet! What MAP do you want to run? You will prob be limited to a TDI MAP sensor. They have both 3 bar and 4 bar. Pick one and Ill try to find a part number. |
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NOTORIOUS VR
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« Reply #17 on: April 16, 2012, 07:00:52 AM »
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Since they're absolute, let's go 4 BAR as I do plan on running over 28.5-29 psi eventually
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matchew
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« Reply #19 on: April 16, 2012, 11:32:31 AM »
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I have a hand full of brand new dealer 4 bar map sensors. Shipping to the US wont be much, certainly not $200  Let me know if you want one. |
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julex
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« Reply #20 on: April 16, 2012, 11:38:14 AM »
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Well, I am no sure that the BEL ecu actually can log above 2550mbar. It appears to be using the same 16 bit variables as ME 7.1 which top out at that pressure reading... At least according to ME7 logger. Unless you can prove that the internal value passed between modules is indeed 16 bit and with higher max value, I am afraid it is still old 8 bit thing that is the real limit.
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Gonzo
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« Reply #21 on: April 16, 2012, 11:50:56 AM »
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Well, I am no sure that the BEL ecu actually can log above 2550mbar. It appears to be using the same 16 bit variables as ME 7.1 which top out at that pressure reading... At least according to ME7 logger. Unless you can prove that the internal value passed between modules is indeed 16 bit and with higher max value, I am afraid it is still old 8 bit thing that is the real limit.
Hmmmmmm.... You can always just scale it and be done with it. |
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« Last Edit: April 16, 2012, 11:57:28 AM by Gonzo »
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NOTORIOUS VR
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« Reply #22 on: April 16, 2012, 11:59:04 AM »
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Well, I am no sure that the BEL ecu actually can log above 2550mbar. It appears to be using the same 16 bit variables as ME 7.1 which top out at that pressure reading... At least according to ME7 logger. Unless you can prove that the internal value passed between modules is indeed 16 bit and with higher max value, I am afraid it is still old 8 bit thing that is the real limit.
I think if it's 16-bit like you say we're good to go.. according to Tony in this post: http://nefariousmotorsports.com/forum/index.php?topic=110.msg400#msg400the M box is limited to 2550mbar because it's stored as an 8-bit value (255 max). |
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julex
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« Reply #23 on: April 16, 2012, 06:45:37 PM »
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Well, a way to settle this would be for somebody with BEL allroad to shorten their 5v to signal wire therefore simulating 5v output on pressure sensor. You don't have to start the car, just fire up me7 logger and collect some data with pvdks_w.
I don't see how it can log more than 2550 mbar if pvdks_w in BEL is also unsigned word with same scalar which gives a max possible value of 2550 (mbar).
I am not trying to be pessimistic...I just think that nothing improved on this front with Me 7.1.1. But I would be very impressed if it indeed worked as we think it might.
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ArgDub
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« Reply #24 on: April 16, 2012, 08:09:53 PM »
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I checked the 250kpa sensor data sheet and a 400kPa sensor data sheet and both pressure sensors output 4.5v at full scale. Unless there is same kind of correction factor in the ecu I think that changing sensors will underscale the readings. edit why not patch code to use rl_w instead of rl in kfwz? just checked, I think it can be done |
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« Last Edit: April 16, 2012, 08:32:27 PM by ArgDub »
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jibberjive
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« Reply #25 on: April 16, 2012, 08:26:53 PM »
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Really curious where this may go. I am having very bad thoughts about swapping in a B8 S4 motor and building a turbo setup for it. This may derail me for a while.
If you do, post a link for sure! I had the same bad thoughts when I read that the 3.0l motor can be had for ~$4k. The toughest part of that would be tuning though, as the cracking of the ECU is really fresh and all of the tuners hold the secrets with their life. Do it. You wont.
He's scared. He won't do it  |
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NOTORIOUS VR
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« Reply #26 on: April 17, 2012, 06:26:37 AM »
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Well, a way to settle this would be for somebody with BEL allroad to shorten their 5v to signal wire therefore simulating 5v output on pressure sensor. You don't have to start the car, just fire up me7 logger and collect some data with pvdks_w.
I don't see how it can log more than 2550 mbar if pvdks_w in BEL is also unsigned word with same scalar which gives a max possible value of 2550 (mbar).
I am not trying to be pessimistic...I just think that nothing improved on this front with Me 7.1.1. But I would be very impressed if it indeed worked as we think it might.
Just shorting to 5v would won't.. you would have to rescale the sensor values in the ECU first obviously. 5V = max for the sensor... 5V by default would be 2.5 BAR |
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julex
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« Reply #27 on: April 17, 2012, 07:03:18 AM »
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Just shorting to 5v would won't.. you would have to rescale the sensor values in the ECU first obviously.
5V = max for the sensor... 5V by default would be 2.5 BAR
Yeah, realized that after I posted. But you see where the problems is right? There is no room in variables for higher boost as they are the same as ME7.1. Which is the 8bit internal variable that gets passed around the modules? |
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NOTORIOUS VR
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« Reply #28 on: April 17, 2012, 07:52:38 AM »
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Yeah, realized that after I posted. But you see where the problems is right? There is no room in variables for higher boost as they are the same as ME7.1. Which is the 8bit internal variable that gets passed around the modules?
Not idea man... like I said to be sure someone would have to disassemble that parameter just like they did with the M-box.... I assume you're saying this because you're going by me7L, but maybe me7L is just working with me7.1.1 the same way as me7.1? |
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nyet
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« Reply #29 on: April 17, 2012, 08:32:21 AM »
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I haven't personally looked at ME7.1.1 but I'm pretty sure the fact that the pressure variable is 16bit doesn't help you at all.
However, it DOES give you a bit more resolution if you want to try underscaling your MAP value (like what tuners did with load in ME7.1 in the beginning).
As i've mentioned before, you might have problems near the zero point, but there are very few places (compared to load) where absolute MAP pressure is used in ME7, so i really do think underscaling the MAP signal will be fairly easy.
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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