Author Topic: LPG fuel pressure correction  (Read 52478 times)

Offline fivepoint6

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LPG fuel pressure correction
« on: November 08, 2015, 09:01:32 pm »
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

Offline MWfire

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Re: LPG fuel pressure correction
« Reply #1 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.

Offline lost

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Re: LPG fuel pressure correction
« Reply #2 on: November 09, 2015, 04:13:57 pm »
Do you use this one from landi renzo rail? Or there is better option?
How to connect it to vems?

Offline MWfire

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Re: LPG fuel pressure correction
« Reply #3 on: November 11, 2015, 11:06:20 pm »
I think i have sensor from lpg tech(two map sensors and one temp sensor).

Offline lost

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Re: LPG fuel pressure correction
« Reply #4 on: August 17, 2016, 06:44:11 pm »


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...

Offline wersch

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Re: LPG fuel pressure correction
« Reply #5 on: January 15, 2017, 05:54:58 pm »
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  :)

Offline MWfire

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Re: LPG fuel pressure correction
« Reply #6 on: January 15, 2017, 06:17:23 pm »
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

Offline wersch

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Re: LPG fuel pressure correction
« Reply #7 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?

Offline MWfire

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Re: LPG fuel pressure correction
« Reply #8 on: January 15, 2017, 06:54:20 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.

Offline wersch

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Re: LPG fuel pressure correction
« Reply #9 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.

Offline Kamuto

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Re: LPG fuel pressure correction
« Reply #10 on: January 16, 2017, 08:50:44 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 :)
Vems installer in Lithuania
valdas.sunokas@gmail.com

Offline lost

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Re: LPG fuel pressure correction
« Reply #11 on: April 03, 2017, 08:29:53 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?

Offline MWfire

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Re: LPG fuel pressure correction
« Reply #12 on: April 03, 2017, 09:18:11 pm »
To diff amp.

Offline lost

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Re: LPG fuel pressure correction
« Reply #13 on: April 03, 2017, 10:13:27 pm »
To diff amp.

Thanks!
And lpg temp sensor is not used?

Offline Kamuto

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Re: LPG fuel pressure correction
« Reply #14 on: April 04, 2017, 10:09:00 am »
To diff amp.

Thanks!
And lpg temp sensor is not used?
would use it in anytrim
Vems installer in Lithuania
valdas.sunokas@gmail.com