Hello,
anytrim can do fuel pressure correction based on differential pressure
(fuel pressure - map).
It seems that this only works with a special 7 bar pressure sensor.
Is there an calibration option to use any sensor ?
Regards,
Jan
i use that correction on my car with 3bar sensors. I connected booth sensor to differential opamp.
Do you use this one from landi renzo rail? Or there is better option?
How to connect it to vems?
(http://grzegorzbmw328.strefa.pl/alb21120.JPG)
I think i have sensor from lpg tech(two map sensors and one temp sensor).
(http://i.imgur.com/L31FJ1m.png)
Here is pinout for lpgtech pts01 and stag ps-02, they are same except different resistance on temp sensor.
Pin #4 is second MAP sensor , maybe it can be used for altitude correction if you dont connect it to engine.
I suppose pin#2 LPG temp, (-40-125C) and pin#3 gas pressure (0-6,75bar) should be connected to anytrim inputs on vems (sensor outputs 0-5v signal)
Hope this pinout helps someone...
Quote from: MWfire on November 09, 2015, 08:43:25 AM
i use that correction on my car with 3bar sensors. I connected booth sensor to differential opamp.
This differential opamp, is it installed on the vems genboard?
If you can please give a little more info on it cause i´m very curious on this topic :)
Yes, on board is that amp.
http://www.vems.hu/files/genboardv3/v3.8/genboardv3.8_sch.pdf
check u13.
DIff input is on JP9
Thanx :D
So i put the signal from 2 equal sensors on pin1 & 2 at JP9 and this must be soldered because normaly this amp is not in use?
Where do i pickup the output signal so i can have it back to a MCP3208 input?
Quote from: wersch on January 15, 2017, 06:30:55 PM
Thanx :D
So i put the signal from 2 equal sensors on pin1 & 2 at JP9 and this must be soldered because normaly this amp is not in use?
Where do i pickup the output signal so i can have it back to a MCP3208 input?
Chip is on board. Output is connected do mcp ch0.
Thanx for that info!
Only problem then is that i need two 7bar sensors, one connected to map and one for Fuelpressure.
Quote from: wersch on January 16, 2017, 07:33:05 PM
Thanx for that info!
Only problem then is that i need two 7bar sensors, one connected to map and one for Fuelpressure.
no you dont need :) one only :)
Quote from: MWfire on November 11, 2015, 11:06:20 PM
I think i have sensor from lpg tech(two map sensors and one temp sensor).
So you have one lpg tech sensor and you connect lpg rail pressure and vacuum from that LPG sensor to op-amp input 1&2?
To diff amp.
Quote from: MWfire on April 03, 2017, 09:18:11 PM
To diff amp.
Thanks!
And lpg temp sensor is not used?
KAMUTO / VEMS / MWFIRE , could you share few screen shoots of anytrim/diffamp input configuration for lpg temp / pressure from your config?
I have connected pts-01 sensor(it has two same map sensor inside 0-4bar 0-5V (for vacuum and lpg pressure) to JP9 diff amp.
ADC analog CH0 is calculated value from diff amp and it works i would use it for lpg fuel trim later...
analog CH1 is value in volts for lpg pressure and its displayed ok
problem is:
analog CH2 reads 0.0V when disconnected, if i connect 1 Volt wire, it reads 0V
When analog CH1 is connected to 3volt from sensor#1 (reads ok) and then when i connect 1 Volt from sensor#2 to CH2, CH1 then jumps (reads) to 5V, if i switch wires, then it reads 0v.
Is there problem with internal pullup?
I have VEMS v3.5 it sholud be like 3.3(http://i.imgur.com/XDGouy6.png)
Youtube link:
https://youtu.be/r8hH_3in7sU (https://youtu.be/r8hH_3in7sU)
Can anyoone help me out with CH2, input?
Time to resurrect this topic :)
I never figured it out, my genboard is v3.5 (top picture), should be same as v3.3 (bottom picture, schematic)
I have two 7bar map sensors outputs connected to JP9 one MAP is on intake vacuum, second MAP is LPG fuel pressure on injector rail (marked yellow on top picture)
And i get this result:
https://www.youtube.com/watch?v=r8hH_3in7sU&feature=youtu.be (https://www.youtube.com/watch?v=r8hH_3in7sU&feature=youtu.be)
How to get it to work ?
(https://i.imgur.com/7Y0fG5p.jpg)
(https://i.imgur.com/nsNfLsc.jpg)
Did you change gain?
No, where to change it?
BTW, i wanted to contact you for dyno after sorting gremlins in car and wiering/sensors (old was wrecked-not by me), so i got another crap for 500â,¬ and transfered VEMS and LPG in it) i was wondering if you moved out from country like everybody else, and today i read on alfa forum that you tuned 24v tb alfa :) so please PM your mobile number i lost it.
Its drivable on gas now , and on lpg i need injector settings for barracuda/hana injectors.
Plese note that ADC raw is strange, like in video when i connect second wire on JP2.
First i shows 2.2V on ch1, then i connect other input and it shows 0.44V on ch2, And ch1 goes from 2.2V to 5V ???
And i am using v3.5, maybe something is different than on v3.8
bump on topic...
Can anyone help i want to connect two map sensors (same, on on lpg pressure hose, second on vacuum hose) to vems diff amp on vems v3.5.
It also has temp sensor for LPG