I don't have my boost gauge installed yet. I have the basic Xede Version 3 chip using Version 3 software. Does the live data feed show me how much boost I am running? I wanted to know if I can see on the software how much boost I am pushing? If so, can someone show a screen shot...

Thanks for any help.

 

Boost reading would reguire a pressure sensor in the intake manifold. Unless you've intalled one, there's not a way to get that info.

However, I guess you could calculate it if you had intake air temp using boyles natural gas law:

PV=nRT.


d

 

donour, how(which input) could I connect my boost sensor to Xede?

 

Let's see if we can get Shiv to answer this one.. i asked awhile ago but never heard anything back.

If there is an open input on the xede, we should be be able to hookup a regular 3 bar GM MAP sensor with a 5v output just like the LC-1. i always wondered why they arent using something like this for boost control (overboost protection, or something like SMART), let alone just having it there for datalogging capability.. hopefully we will see an answer.

 

For Boost control would be nice, but would require more work. I just want a simple boost input at this time for datalog data.

 

Well, if you're using SMART it might be difficult. If not, AN0 is chiptorque/vishnu's stadard location for a 0-5v MAP sensor. You could wire it there then datalog and/or view it on the live data display.

I suppose you could also use it as a the load variable for the boost table and get closed loop boost control all the time.

EDIT: for those of you who've never used my software ( or gotten it to work ),
I have this table buried in it. It's a list of the inputs/outputs that are available from software on the Xede.


("Engine RPM" ,"100rpm resolution"),
("Crank timing out (tuned timing shift)","0 = -max?; 128 = 0?; 255 = +max?"),
("Analog 0 input (MAP)" ,"0..1000 = 0..100.0% of full scale (5V),"),
("Analog 1 input (MAF)" ,"0..1000 = 0..100.0% of full scale (5V),"),
("Analog 2 input (TPS)" ,"0..1000 = 0..100.0% of full scale (5V),"),
("(unused)" ,"" ),
("Boost solenoid input duty cycle" ,"0..1000 = 0..100.0% duty cycle (active low),"),
("Reserved / temporary input 0" , "" ),
("Reserved / temporary input 1" , "" ),
("Reserved / temporary input 2" , "" ),
("Reserved / temporary input 3" , "" ),
("Analog 0 output (MAP) tuned" ,"0..1000 = 0..100.0% of full scale (5V),"),
("Analog 1 output (MAF) tuned" ,"0..1000 = 0..100.0% of full scale (5V),"),
("Analog 2 output (TPS) tuned" ,"0..1000 = 0..100.0% of full scale (5V),"),
("Injector channel 0 output pulse width","0..255 = 0..25.5ms on-time"),
("Injector channel 1 output pulse width","0..255 = 0..25.5ms on-time"),
("Knock attenuate state" ,"0 = not attenuated, 1 = attenuated"),
("Boost solenoid output duty cycle" ,"0..1000 = 0..100.0% duty cycle (active low),"),
("Internal 3.3V power supply" ,"675 = 3.3V (approximately),"),
("Internal 5.0V power supply" ,"512 = 5.0V (approximately),"),
("Input power supply voltage" ,"491 = 12V (approximately),"),
("Timing logic version" , "" ),
("Timing logic build" , "" ),
("Timing logic track ID" , "" ),
("MAF input percentage (frequency MAF)" ,"0..1000 = 0..100.0%"),
("MAF output percentage (frequency MAF)","0..1000 = 0..100.0%"),
("Water spray state" ,"0 = not activated, 1 = activated"),
("Tuning data checksum" ,"Periodically updated (1-2 seconds),"),
("Map info" , "Low byte = current map bank number Bit 15 = 'changing map bank
s' flag")


d

 

I thought maybe boost pressures were seen by the stock ECU, and with the piggyback Xede installed you could some how see it on the screen. I figured the stock ECU is keeping your boost at a certain level...but I guess that is what the restricter pill does.

I guess the best thing to do is just install the boost gauge....

As for the natural gas law...never heard of it...the only natural gas I know about is behind me

 

It would be difficult for SMART because AN0 is being used for something else or is there another reason? I haven't installed the Xede/SMART yet, but I've got an AEM 3.5 Bar that I would like to use to log pressure. I've also wondered why a MAP sensor is not normally used with Xede/SMART, so I'm curious.

 

AN0 is the knock buffer on SMART cars. However, I just remembered that Evo Xedes don't use the throttle input. So, you could use AN2, which I believe is also a 0-5v input.

Because the evo doesn't come with one. Sure you could convert it to run on map if you really wanted, but stock intake and MAF system work very well, even at moderately high power levels (double stock).

EDIT: how much is a 3bar map sensor these days. Now that I'm thinking about it, It'd be nice to install one then throw away my cheap mechanical gauges (i.e. install them on my WRX).


d

 

Ah okay, I thought I remembered seeing AN0 as one of the SMART inputs.

I didn't mean convert the intake system, just use a MAP sensor as a measure of pressure for logging. I guess it doesn't really matter since the air is measured by the intake and pressure could be determined as you mentioned earlier in this thread. I had put my AEM sensor up for sale, but maybe I'll hold onto it for now just in case I want to log pressure (somehow) with the Xede. Otherwise, I think they're going for about $150-160 new.

 

Zeitronix sells the 3.5 Bar(same as AEM) sensor for $109 w/wiring cable. GM sensor sell for ~$90.

As of now I can log from zeitronix w/usb serial port(com2) and xede on com 1 at the same time but would like to consolidate data on one file. Double files per run are becoming difficult to manage.

 

Is a controller or something needed? I imagine it would have to be powered right?

I ran into a similiar problem with datalogging from an engine on a formula car I'm working on. The problem basically boils down to the following. I have multiple data sources that get logged to separate places. To make matters worse, they all log at different samplerates.

The obvious solution is to insert extra samples into the shorter files and correlate on RPM values. This works so-so, but be careful if you are trying to study events that happen very quickly.

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The zeitronixs is a 5v pressure transducer so it may well need a controller or get power from a 5v power source.

http://http://www.kavlico.com/assest...55DSsm0105.pdf

The zeitronix time stamp is useless but sample rate is close to 60/sec same as comslog6. Correlating RPM gets old after a while.

 

What I meant was, you can use the RPM reading to correlate different data sources if RPM is available. If you just have a pressure reading and timestamp, it's not so easy. Again, I'm sure you realize this. The original points stands (and I agree with it); it'd be easier to have the reading available to the xede directly.

d

 

I don't see why you'd need a controller for the pressure sensor, you just need a good 5v input and then it will give you a 0-5v signal. It's good to know the price on the sensors has dropped, although not that great for resale value.