Reading from the VGT

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Offline me78569

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Re: Reading from the VGT
« Reply #15 on: March 24, 2016, 08:45:32 PM »
So how sure are you that byte 4 is coolant temp?  The logs I am looking at show almost no temp difference between warm up and WOT runs. 
2000 Dodge 2500 quad-cab 5.9 Cummins slt, homebuilt 47re revmax 3.5 messed with vb, Quad adr iquad, 4" tbe , pureflow 150 gph. he351ve in the works 100hp DFI inj

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Offline Rx7man

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Re: Reading from the VGT
« Reply #16 on: March 24, 2016, 09:35:50 PM »
Moderately... It seems sensitive around cooler temps and doesn't change much at higher temps... I've had other fish to fry and haven't looked into it closely in a while... When I was bench testing it I warmed up the actuator unit with a torch and it was changing as it warmed up, and I heard there was a temperature sensor in the things.. I put two and two together.
'94 dodge, Colt Cam, head worked, NV5600, 3.55's, SB clutch, Ford manual hubs w. hawk brakes, custom flatdeck, custom aluminum bumper, cab off restoration, totally new engine, Mahle pistons @19:1..HE351VE with 67mm turbine and 67x95mm compressor
440hp/1000 ft lb @ 2400 RPM

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Offline me78569

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Re: Reading from the VGT
« Reply #17 on: March 25, 2016, 07:11:10 AM »
the logs I have must have come from a truck that it was not working on.

I tested it this morning on the way in,  It is most def in C, but I am not sure about the linear part yet.  I believe it is a -40 offset
Also since the turbo is piped into the coolant lines for the heater core, I am sure that threw it off some.
Turbo in c    Coolant in F
51                57
71                125
80                 150
90                 170
100                181
112                196


Then the turbo went to 120 and held there, didn't cool down as coolant did. 

Know I am guessing that the strange readings are due to it being a PCB reading vs and actual coolant reading. 
2000 Dodge 2500 quad-cab 5.9 Cummins slt, homebuilt 47re revmax 3.5 messed with vb, Quad adr iquad, 4" tbe , pureflow 150 gph. he351ve in the works 100hp DFI inj

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Offline me78569

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Re: Reading from the VGT
« Reply #18 on: March 29, 2016, 11:22:39 AM »
The above readings seem pretty constant for each warmup cycle.  When the turbo reports ~90-100 I would say the truck is warm
2000 Dodge 2500 quad-cab 5.9 Cummins slt, homebuilt 47re revmax 3.5 messed with vb, Quad adr iquad, 4" tbe , pureflow 150 gph. he351ve in the works 100hp DFI inj

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Offline Rx7man

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Re: Reading from the VGT
« Reply #19 on: March 29, 2016, 12:07:52 PM »
It's good enough for knowing if you're in warmup mode or not, but it certainly isn't a super accurate method.

If you want accuracy, I gotta say those thermocouples are the cats meow.  I haven't done everything I need to for testing yet, but they work well... for the compressor outlet temp I just slid the wire under the rubber coupler and tightened it back down, works great, I just need a longer one to get to the other side.
'94 dodge, Colt Cam, head worked, NV5600, 3.55's, SB clutch, Ford manual hubs w. hawk brakes, custom flatdeck, custom aluminum bumper, cab off restoration, totally new engine, Mahle pistons @19:1..HE351VE with 67mm turbine and 67x95mm compressor
440hp/1000 ft lb @ 2400 RPM

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Online hakcenter

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Re: Reading from the VGT
« Reply #20 on: April 30, 2016, 10:29:35 PM »
I can verify it seems once the unit is about 100 value wise. My temp is at least on the gauge on my truck dash.

I'm only using it to be light on the turbo until I'm warmed up slightly.  Haven't really checked temperatures on a fully warmed motor but I don't even have coolant hooked up.


I'll be releasing experimental code for the base. It'll include talking to the turbo and getting values. Haven't bothered to map out the temp sensor. But there is some simple communication via serial data now in preparation for the Bluetooth 2.0

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Offline Rx7man

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Re: Reading from the VGT
« Reply #21 on: May 01, 2016, 08:56:53 AM »
Nice.. I'm not going to have BT on my truck... at least not until I get the Raspberry pi installed, and that's going to take some time for sure..
'94 dodge, Colt Cam, head worked, NV5600, 3.55's, SB clutch, Ford manual hubs w. hawk brakes, custom flatdeck, custom aluminum bumper, cab off restoration, totally new engine, Mahle pistons @19:1..HE351VE with 67mm turbine and 67x95mm compressor
440hp/1000 ft lb @ 2400 RPM