Rotary setup AFR / 2xEGT / Boost Oil Fuel Press / Oil Water IAT Temp

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Khomas
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Rotary setup AFR / 2xEGT / Boost Oil Fuel Press / Oil Water IAT Temp

Postby Khomas » Sun May 31, 2020 2:41 pm

Hello,

I'm really interested for the UTComp, but I have somes questions before
I want to use it on a rotary engine (RX7 FD3S)

1) Did The fuel consumption will work ?
Because on this engine we have 1 primary injectors (work everytime) and 1 secondary injectors (only for boost) for the same rotor

2) For the setup, here is informations I need :
Oil pressure
Fuel pressure
Oil temperature
Water temperature
Intake temperature
EGT on front rotor
EGT on rear rotor
AFR
Boost pressure

Can the UTComp handle this ?

I read the others posts and you said we can use the ADc5 (0-30V) with input 0-5V so that is OK But I still need one more input for Oil temperature because I don't want digital sensor for this (Oil temp can reach 160°C)

So here is what I've planned :

Oil pressure : AdcVcc 1 with power and ground from DS18B20C
Fuel pressure : AdcVcc 2 with power and ground from DS18B20D
Oil temperature : Adc 5 with NTC sensor
Water temperature : DS18B20A
Intake temperature : DS18B20B
EGT on front rotor : Adc 1
EGT on rear rotor : Adc 2
Boost pressure : Adc3
AFR : Adc 4

But to use AdcVcc 1 and 2, I seen I need to remove the little resistors R14 and R21, right ?

Maybe there is another solution without removing these 2 resistors ?

If no, is it possible to remove this resistors in your shop before to send it ? I don't feel comfortable with this operation
What about the warranty if it's removed ?

Thanks a lot
Thomas
Last edited by Khomas on Mon Jun 01, 2020 5:05 pm, edited 1 time in total.

ArT
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Re: Rotary setup AFR / 2xEGT / Boost Oil Fuel Press / Oil Water IAT Temp

Postby ArT » Sun May 31, 2020 9:20 pm

Hi Tomas,

Fuel consumption is based on single injector signal, so it will work only if you have "trip computer signal" or "fuel consumption signal" in ecu. It will not work directly on injector signal because it will not include boost injection.

Connection looks almost fine. NTC sensor for oil temperature (Adc5) - if you would like to use stock sensor (already powered from ECU) then it's fine, but if you would like to use external sensor (connected only to UTCOMP) then you should connect it to AdcVccX

We can modify AdcVccX inputs to AdcX inputs (remove resistors) free of charge and waranty will be valid. Just add note to order so we can do it before shipping.

BR
Artur

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Re: Rotary setup AFR / 2xEGT / Boost Oil Fuel Press / Oil Water IAT Temp

Postby Techpriest » Mon Jun 01, 2020 2:01 am

Would a Fuel Flow sensor allow him to monitor Fuel consumption? Iam aware to get a exact reading you need two (unless deadhead system) but the signal should work or?

also fuel flow sensors are hella expensive

ArT
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Re: Rotary setup AFR / 2xEGT / Boost Oil Fuel Press / Oil Water IAT Temp

Postby ArT » Mon Jun 01, 2020 7:27 am

Any flow sensor will work but you need to include only fuel consumed (not consumed + returned to the tank). And accurate flow sensors are expensive. There is also other idea which may be tested - in UTCOMP you can measure two fuels (e.g. PB + LPG) so you can connect regular injection to PB (pin A10) and boost injection to LPG (pin A11) - in such case it should be possible to get 2 measurements, one will be for regular consumption and second will be only for boost consumption. I'm not tested it in such case, it's idea only and accuracy should be verified but all measurements will be independent (LPG/PB) and TRIP screen will be showing summary (PB+LPG).

Khomas
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Re: Rotary setup AFR / 2xEGT / Boost Oil Fuel Press / Oil Water IAT Temp

Postby Khomas » Mon Jun 01, 2020 5:21 pm

Ok Artur thanks for the quick answer

So I think it's not possible to have the fuel consumption information, anyway it's not the most important

here is the corrected connection with your NTC sensor :
Oil pressure : Adc5 with power and ground from DS18B20C
Fuel pressure : AdcVcc 2 modified in Adc with power and ground from DS18B20D
Oil temperature : AdcVcc1 with NTC sensor
Water temperature : DS18B20A
Intake temperature : DS18B20B
EGT on front rotor : Adc 1
EGT on rear rotor : Adc 2
Boost pressure : Adc3
AFR : Adc 4

Can you tell me which sensor has the best reactivity ? Between them :
Ds18b20 waterproof
Ds18b20 with thread (from your trick on others topic)
NTC sensor

And another question,
Is it possible to set the AFR alarm depending on the boost value ?

Thanks a lot
Thomas

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Re: Rotary setup AFR / 2xEGT / Boost Oil Fuel Press / Oil Water IAT Temp

Postby ArT » Tue Jun 02, 2020 7:06 am

Now it's ok :) Please note that you can share +5V DS18B20.. output for both sensors (oil pressure and fuel pressure).

If you would like to use DS18B20 for air temperature (without thread) then best response will be for sensors only + wires (e.g. https://www.youtube.com/watch?v=R8Z66qtYowA). If you would like use it on thread (e.g. for water temp) then best response will have NTC analog sensor but if you do not need fast refreshing then DS18B20 assembled in thread will be fine too (please check it here point #2 https://www.youtube.com/watch?v=R8Z66qtYowA)

AFR and EGT alarms can be disabled for low level boost (<0.3 bar constant value)


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