Nitrous Bottle Pressure logging

[Beer99C5]

Now that my fuel pressure is on the EGR PCM Pinouts (Thanks a Bunch TAQ!), that free's up the second input on my trusty Ol' V1.

Here are the Particulars of the sending unit for my Dynotune Nitrous Pressure
Nitrous pressure Sender Output = .005V per 100 psi
PSI Volt
0 2.547
100 2.552
200 2.557
300 2.562
400 2.567
500 2.572
600 2.577
700 2.582
800 2.587
900 2.592
1000 2.597
1100 2.602
1200 2.607
1300 2.612
1400 2.617
1500 2.622

This voltage is read from the black wire.

Little help making the PID for this? :cheers:

[Ninety8C5]

Something like ((Voltage - 2.552)*20000) + 100, should work.

[Beer99C5]

Thanks that seems to work great (in Excel for various values), is there a way to force a 0 reading if the voltage 2.547 or slightly less (for when the bottle is not in?)

[Ninety8C5]

Oops, I missed the zero reading. I think that this is what you are looking for.

(({EXT.AD1} - 2.547) * 20000) = PSI

Sorry about that.

[Beer99C5]

No problem Appreciate the help :cheers:

[Beer99C5]

So is this what I need for my User calc file? *CLC-00-002 being what I am adding on AD2 input?

# ================================================== ============================
# File details
# ------------
#
# This section defines various details about the file format.

*FILE

#Parameter Value Description
#---------- ---------------- ---------------------------------------------------
VERSION 7.1.1 File version
DECSEP . Decimal separator used in this file



# ================================================== ============================
# Units
# -------------------
# See sae_generic.txt for more information on the *UNITS section

*UNITS

#Code System Abbr Description
#-------- ---------- -------- --------------------------------------------------
PSI Imperial PSI "Pounds Per Square Inch"
# ================================================== ============================
# Add slot definitions here
# --------------------------------
#Units Low High Fmt Expression
#------------ ------------- ------------- ---- ---------------------------------
*CLC-00-001
PSI 0.00 100.00 .2 "({GM.EGRS}*25)-12.5"
# ================================================== ============================
*PRN - Parameter Reference Numbers
# --------------------------------
#Code PRN SLOT Units System Description
#------------- ---- ------------ ------------ ------------ ---------------------
CALC.FP F001 CLC-00-001 PSI Fuel "Fuel Pressure"


*CLC-00-002
PSI 0 1500 1 "(({EXT.AD2}-2.547)*20000)"
# ================================================== ============================
*PRN - Parameter Reference Numbers
# --------------------------------
#Code PRN SLOT Units System Description
#------------- ---- ------------ ------------ ------------ ---------------------
CALC.NP F002 CLC-00-002 PSI Accessories "Nitrous Main Line Pressure"

[Ninety8C5]

That should do it. I think you can leave out the first '(' and the last ')', but it shouldn't bother anything. I left them there from the first equation.

I like the color of your car. I have a 98 Nassau Blue coupe. :)

[joecar]

Beer,

I took the liberty to "optmize" your calc_pids... see attached... :)

(psi units are already pre-defined)

Cheers
Joe

[Blacky]

FlashScan A/D inputs are accurate to +/- 0.01V, so measuring down to 0.005 Volts will not be 100% accurate.

The PSI displayed by EFILive will be accurate to +/- 200PSI

And to get it to display 0 under 2.547V, you could do this:
(oh and I changed the precision to 0).



psi 0 1500 0 "Iff({EXT.AD2}<2.547,0,({EXT.AD2}-2.547)*20000)"

Regards
Paul


Now that my fuel pressure is on the EGR PCM Pinouts (Thanks a Bunch TAQ!), that free's up the second input on my trusty Ol' V1.

Here are the Particulars of the sending unit for my Dynotune Nitrous Pressure
Nitrous pressure Sender Output = .005V per 100 psi
PSI Volt
0 2.547
100 2.552
200 2.557
300 2.562
400 2.567
500 2.572
600 2.577
700 2.582
800 2.587
900 2.592
1000 2.597
1100 2.602
1200 2.607
1300 2.612
1400 2.617
1500 2.622

This voltage is read from the black wire.

Little help making the PID for this? :cheers:

[Beer99C5]

Thanks all, not sure if 200 +or - is worth the effort now, I will try it though (its only one wire 2' long). Both V1 and V2 have the same A/D inputs accurate to +/- 0.01V?

[redhardsupra]

this is a very small range of values to express a large range of pressures, can you pick values for range and domain arbitrarily?

[Doc]

I am not logging the values but this is what I am using to maintain bottle pressure.

http://www.ifmefector.com/ifmus/web/padv1!US_2_20_10_10_10_10_10.html

I have it hooked up to a relay to control the on / off of the blanket. It accurate to +/-2psi. Independant testing in my lab verified their claim using a King Nutronics Precision pressure standard.

[Beer99C5]

Well hooked it up, read 1259 with a actual pressure 580 or so...
2.61 Volts fairly steady...1259 PSI from the PID
The voltage was pretty steady and the PSI matched the formula.

Guessing I need to offset the voltage? How do I do that to try and match the actual pressure?

[Beer99C5]

Hooked it up to the V2, the Voltage range is just too tight with the Dynotune Sending unit fluxuated badly as Blacky said it would, will revist this with a different sending unit (one that uses most of the 0-5v range) later...on to COS 5

:cheers:

[Beer99C5]

Going with the Autometer 0-1600 sending unit from Summit...ordering tonite, hope to have it installed first week of Nov.

Bored here in Singapore...Drew a Nitrous Bottle in 3dsMax and imported it for a Pressure guage.

http://www.retrorelics.net/jim/Boards/EFILive/Bottledash.jpg

[gto_in_nc]

Very cool!

[WiseGuyZ06]

Beer, since my EXT.AD1 input is used for my LC1 can I do the same as you exept use the EXT.AD2 input for logging nitrous pressure??? then use the same common groung on the V1 as I did for the LC1???

THANKS

[Beer99C5]

Yes that should work. Thats how I hooked up my V1 for WB and fuel pressure at first. Then I modified the fuel Pressure to work through the EGR Pinout in the PCM (Good Unused 5V source).

[TAQuickness]

I like that dash Beer. Kinda reminds me of a process control graphic!

[WiseGuyZ06]

Yes that should work. Thats how I hooked up my V1 for WB and fuel pressure at first. Then I modified the fuel Pressure to work through the EGR Pinout in the PCM (Good Unused 5V source).

Cool now all I need is the custom PID for the autometer sending unit..hint hint:)

[WiseGuyZ06]

Do the 2001 c5's have that unused 5v source pinout in the pcm since that year has no egr???

[WiseGuyZ06]

Actually I need to log Nitrous pressure and my standalone fuel system fuel pressure... Beer gonna shoot you a PM....

[Beer99C5]

For the "Gauge and Dash Board Challenged"

http://www.retrorelics.net/jim/Boards/EFILive/Guageconf.jpg

Just noticed on Value I need to change it to 4 digits

[Beer99C5]

Actually I need to log Nitrous pressure and my standalone fuel system fuel pressure... Beer gonna shoot you a PM....

Sending an email to autometer on the scaling of there sending unit today...I had it once but do not have it on my laptop...I think I have a spreadsheet on it but want to double check...I may need help with the PID as well...should have that wrapped up by Saturday :cheers:

:cheers:

[WiseGuyZ06]

Sending an email to autometer on the scaling of there sending unit today...I had it once but do not have it on my laptop...I think I have a spreadsheet on it but want to double check...I may need help with the PID as well...should have that wrapped up by Saturday :cheers:

:cheers:

Sweet... Im gonna log fuel pressure 1st.. cause I have a mechanical NOS pressure gauge..

[WiseGuyZ06]

Beer do you have the scaling on the autometer Fuel pressure sending unit??? So I can log my standalone....

Also Can I use my AC wiring since its a 0-5v... I ditched the AC long time ago.. If Im not mistaken its 0-5v..

So I could use the V1 to log the NOS pressure since thats in the car and the AC wiring since thats near my Nitro Dave's standalone.... or vice versa

Just need custom PID's......

[5.7ute]

Beer do you have the scaling on the autometer Fuel pressure sending unit??? So I can log my standalone....

Also Can I use my AC wiring since its a 0-5v... I ditched the AC long time ago.. If Im not mistaken its 0-5v..

So I could use the V1 to log the NOS pressure since thats in the car and the AC wiring since thats near my Nitro Dave's standalone.... or vice versa

Just need custom PID's......
The pid for the Autometer pressure guage is in here.http://www.holdencrazy.com/EFILive/Tutorials/LS1FuelPressureSendingUnitTutorial.zip

[WiseGuyZ06]

The pid for the Autometer pressure guage is in here.http://www.holdencrazy.com/EFILive/Tutorials/LS1FuelPressureSendingUnitTutorial.zip

Cool, the link dont work, BUT ill use the tutorial and log it through the EGR cause it still has it in the PCM ( I have a 2001 corvette ). Ill use the EGR pid to log fuel pressure....

So many different ways..geesh

[Beer99C5]

Pressure = (Voltage-.5)*400 seems to work for the 1600 PSI gauge.

[Beer99C5]

Autometer tech service on the 2240

The wiring for the 2240/2246 is Gray= +5VDC, Black= Ground and the Purple= Signal. The 2240 sender spec are as follows...


PSI volts
0 0.5
800 2.5
1600 4.5



Doug Lemons
Tech/Service

[Beer99C5]

Works Great!

# ================================================== ============================
# File details
# ------------
#
# This section defines various details about the file format.

*FILE

#Parameter Value Description
#---------- ---------------- ---------------------------------------------------
VERSION 7.1.1 File version
DECSEP . Decimal separator used in this file



# ================================================== ============================
# Units
# -------------------
# See sae_generic.txt for more information on the *UNITS section

*UNITS

#Code System Abbr Description
#-------- ---------- -------- -------------------------------------------------------------



# ================================================== ============================
# Add slot definitions here
# --------------------------------
# See sae_generic.txt for more information on "SLOT" formats
#
#Units Low High Fmt Expression
#------------ ------------- ------------- ---- --------------------------------------------------------------

*CLC-00-001
psi 0 100 0.1 "({GM.EGRS}*25)-12.5"

*CLC-00-002
psi 0 1600 0.1 "({EXT.AD2}-0.5)*400"



# ================================================== ============================
*PRN - Parameter Reference Numbers
# --------------------------------
# See sae_generic.txt for more information on the *PRN section
#
#Code PRN SLOT Units System Description
#------------------------- ---- ------------ ---------------- ---------------- ------------------------------------------
CALC.FP F001 CLC-00-001 psi Fuel "Fuel Pressure"
CALC.NP F002 CLC-00-002 psi Nitrous "Nitrous Main Line Pressure"

[WHYTRYZ06]

Sweet, beer, I just got the dynotune FP gauge and dean said it wont log properly. So no logging FP for my nitrous system....that sux

I ditched the autometer gauge, what a POS.....

[Beer99C5]

Sweet, beer, I just got the dynotune FP gauge and dean said it wont log properly. So no logging FP for my nitrous system....that sux

I ditched the autometer gauge, what a POS.....

Dont ditch the Sending unit for the Autometer Fuel gauge if it does not work send it back to autometer. I fried the first one..told them that I put 12V to it (its only supposed to have 5V) and they sent me a new one (free) when I told them the sending unit had no instructions in the packing, and I was using it for logging and not in conjunction with one of their gauges.

I talked with Dan and Dean at Dynotune, their sending units have to narrow a voltage to be used with EFI Live (their gauges work very well though).