LPG fuel pressure correction

[fivepoint6]

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

[MWfire]

i use that correction on my car with 3bar sensors. I connected booth sensor to differential opamp.

[lost]

Do you use this one from landi renzo rail? Or there is better option?
How to connect it to vems?

[MWfire]

I think i have sensor from lpg tech(two map sensors and one temp sensor).

[lost]

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...

[wersch]

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  :)

[MWfire]

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

[wersch]

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?

[MWfire]

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.

[wersch]

Thanx for that info!
Only problem then is that i need two 7bar sensors, one connected to map and one for Fuelpressure.

[Kamuto]

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 :)

[lost]

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?

[MWfire]

To diff amp.

[lost]

To diff amp.

Thanks!
And lpg temp sensor is not used?

[Kamuto]

To diff amp.

Thanks!
And lpg temp sensor is not used?

would use it in anytrim