Author Topic: LPG fuel pressure correction  (Read 5746 times)

Offline lost

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Re: LPG fuel pressure correction
« Reply #15 on: April 13, 2017, 01:22:44 pm »
KAMUTO / VEMS / MWFIRE , could you share few screen shoots of anytrim/diffamp input configuration for lpg temp / pressure from your config?

Offline lost

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Re: LPG fuel pressure correction
« Reply #16 on: July 09, 2017, 06:30:32 pm »
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


Youtube link:
https://youtu.be/r8hH_3in7sU
« Last Edit: September 11, 2017, 09:42:26 pm by lost »

Offline lost

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Re: LPG fuel pressure correction
« Reply #17 on: July 12, 2017, 04:41:20 pm »
Can anyoone help me out with CH2,  input?

Offline lost

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Re: LPG fuel pressure correction
« Reply #18 on: April 02, 2019, 01:55:00 am »
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

How to get it to work ?





Offline MWfire

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Re: LPG fuel pressure correction
« Reply #19 on: April 02, 2019, 12:56:19 pm »
Did you change gain?

Offline lost

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Re: LPG fuel pressure correction
« Reply #20 on: April 02, 2019, 01:13:20 pm »
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 500€ 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.

Offline lost

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Re: LPG fuel pressure correction
« Reply #21 on: April 02, 2019, 01:38:00 pm »
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

Offline lost

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Re: LPG fuel pressure correction
« Reply #22 on: May 15, 2019, 11:45:12 pm »
bump on topic...