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Sensor calibrating - Holley efi

 
Old 05-15-2019, 07:44 PM
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Default Sensor calibrating - Holley efi

I've been working trying to learn as much as I can about the Holley efi and I'm stumped on something simple... I've set up the boost controller and got to where instructions say "IMPORTANT! It would be good at this point to save the GF, send to ECU, and verify the Dome Pressure sensor is reading correctly. If there is a zero offset of more than about 0.25psi for a pressure transducer (from 0.0 PSI), or .25 kPa for a MAP sensor (vs the Baro reading), you can correct that here." But I can't figure out how to do that? Do I need to datalog it or where can I actually view dome pressure in real time while online? I want to hook the dome pressure line up to regulated air and confirm my transducer is reading correctly and adjust the offset. MADDENING... While I'm at it I'd also like to do something similar with my fuel pressure transducer - compare it to a mechanical gauge for accuracy and adjust in the custom sensor etc.
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Old 05-15-2019, 11:46 PM
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Old 05-15-2019, 11:47 PM
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that's the screen you use to change the offset for the MAP, is that what you are asking?
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Old 05-15-2019, 11:52 PM
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Old 05-15-2019, 11:53 PM
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that's where you change the offset for the dome
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Old 05-16-2019, 07:33 AM
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Yes thatís the part where Iím stumped. It says to verify dome pressure is reading correctly. How do I do that? What screen will show a live dome pressure reading?
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Old 05-16-2019, 12:14 PM
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you have to add a custom ICF, use the blank one. Add the dome sensor, select 5v, attach it to an input. Then go to the screen above, select the correct sensor that you are using.

On the dash screen, you can click on a gauge and it will show all the sensors and inputs. select "Dome Sensor" or whatever you called it and it should display it on the gauge. Changing that offset is just like changing the offset for the regular MAP sensor.

As far as the datalog, Holley logs EVERYTHING on it's own. Which is nice but can make the datalog files huge.

To see it in a datalog, go to the screen where you can edit the PIDs/channels that are being shown in a particular group. You should see the dome sensor in your inputs. I can't remember if it lists still as an input or what you named it. I "believe" it should be what you actually named that input to be.

If I didn't answer your question let me know and I will try to get you the info you need.
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Old 05-16-2019, 12:26 PM
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Ok THANK YOU! I think that is the part I was missing. I will try that tonight. Is there also a good way to view/check my fuel pressure transducer raw voltage vs psi? It is currently reading differently than my mechanical guage at higher pressures. I need to set up the custom sensor correctly.
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Old 05-16-2019, 01:27 PM
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Originally Posted by Justa6MB View Post
Ok THANK YOU! I think that is the part I was missing. I will try that tonight. Is there also a good way to view/check my fuel pressure transducer raw voltage vs psi? It is currently reading differently than my mechanical guage at higher pressures. I need to set up the custom sensor correctly.
As far as I know there isn't a way to monitor sensor voltages in Holley EFI. The only way I know how to do it is use a DVOM and check the voltage at the sensor itself. Since it's a 3 wire 5v sensor, check the signal voltage wire.

What fuel pressure transducer are you using? What type of mechanical gauge are you using? How big of difference is there?

If you are using a good transducer and it's scaled correctly, i would be more inclined to trust it over a mechanical gauge unless you are using a really really good mechanical gauge.
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Old 05-16-2019, 10:23 PM
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Worked like a charm Got both sensors dialed in. Thanks a bunch.
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Old 05-17-2019, 06:46 AM
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Originally Posted by Justa6MB View Post
Worked like a charm Got both sensors dialed in. Thanks a bunch.
thats awesome man!
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Old 05-17-2019, 02:23 PM
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Originally Posted by LilJayV10 View Post
As far as I know there isn't a way to monitor sensor voltages in Holley EFI. The only way I know how to do it is use a DVOM and check the voltage at the sensor itself. Since it's a 3 wire 5v sensor, check the signal voltage wire.

What fuel pressure transducer are you using? What type of mechanical gauge are you using? How big of difference is there?

If you are using a good transducer and it's scaled correctly, i would be more inclined to trust it over a mechanical gauge unless you are using a really really good mechanical gauge.

You can monitor sensor voltages its just not published anywhere that I know of.
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Old 05-17-2019, 03:54 PM
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Originally Posted by LSX Power Tuning View Post
You can monitor sensor voltages its just not published anywhere that I know of.
That's good to know. Next time I talked to Rick Anderson I'll ask him about it. Thanks for the heads up
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Old 05-17-2019, 04:41 PM
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Originally Posted by LilJayV10 View Post
That's good to know. Next time I talked to Rick Anderson I'll ask him about it. Thanks for the heads up

Im sure Rick knows..he is my account rep and awesome to work with IMO....if he doesnt for some reason pm or call me I'll help you.
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Old 05-17-2019, 04:49 PM
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Originally Posted by LSX Power Tuning View Post
Im sure Rick knows..he is my account rep and awesome to work with IMO....if he doesnt for some reason pm or call me I'll help you.
He is ours too. Definitely great to work with.
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Old 05-18-2019, 11:00 PM
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Default Fuel Pressure

Well rats... I thought I had it figured out but I discovered I have a fuel system problem. You were right the mechanical gauge was wrong and the transducer was right. However when I tried to set the fuel pressure properly I couldnít get it below 51 psi. Iím running a A1000 pump with a -6an return line. Looking for feasible options?
Replace fuel pump with dual pump.
Run -8an return fuel line.
PWM the pump.
Start a new thread lol.
Or is it possible to just run higher base fuel pressure and set it accordingly in the EFI software?

i should add Iím only planning on running 15 psi max for 800 ish HP.

Last edited by Justa6MB; 05-18-2019 at 11:03 PM. Reason: Extra info
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Old 05-19-2019, 10:42 AM
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What exactly are the problems with the fuel system other than you can't set the base pressure?

What regulator are you using and how is it plumbed up?

Do you have a bunch of 90's, 120 and 180 degree fittings?
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Old 05-19-2019, 03:24 PM
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Default Fuel system

I think thatís the only problem. Iíve added up to 20 psi on the reference port and fuel pressure rises very close to 1:1. Iím using a cheapo regulator. I have -10 feed line reduced to -8 to the PS Holley fuel rail. I used the -8 joiner across to the DS. At the DS rear -8 to the regulator. Other side of the regulator is plugged and Iíve got the -6 line right back to the tank. No bend fittings on the return line. I suppose I should mention the -6 line Iím using was the existing nitrous line. I suppose itís either the line or the regulator?
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Old 05-19-2019, 04:21 PM
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Did the regulator come with 2 springs? Most of, if not all of Holleys regulators do. They come with the low pressure spring installed for a carb pressure, and you have to swap out the spring for EFI pressure. I've seen them do some really goofy things with the carb spring when using EFI pressure.

There also might be some debris in the regulator. It should be pretty easy to take apart and check.

If you want to see if your return system is a problem, you need to put a pressure gauge in the return line and see if there is any pressure. If there is more than 1 psi there's an issue with the line not being big enough, partially restricted or pinched.
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