Welcome to the North American Subaru Impreza Owners Club Saturday November 22, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Engine Management & Tuning

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-11-2006, 09:40 PM   #1
scooterforever
Scooby Specialist
 
Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:
2002

Default Fun with a LM-1 and the analog logger

So I just got an LM-1 and love it. I am using the RPM Converter to log RPMs, but it will also accept up to 5 additional 0v to 5v signals (including RPMs).

So far I have hooked up my KnockLink (the 'red' warning light) to the RPM logger to send 0.7 volts when knock is detected. Works quite well, as follows: the knocklink sends a ground signal to a relay, which sends 0.7 volts (12v from the main power supply and stepped down using resistors in a voltage divider) to the LM-1. The first version used a relay with 60 milliamp coil; it didn't work, as the knocklink ground signal was too weak to trigger the relay. I switched to a 11 milliamp read relay from RadioShack, and it works great.

Next project: tapping into the EGT probes from my Autometer EGT gauge so I can track exhaust gas temps. This requires an additional circuit (using an Analog Devices temp circuit) and using type K thermocouple wire (as regular copper will create voltage noise and throw off the EGT readings).

Now a question for the community:

I have a Davtron IC temp gauge, and these temp senders use current (as opposed to voltage) to send back temperature data. I only know enough electronics to be dangerous. Does anyone have any suggestions on how I can translate a <500 milliamp current into a 0v-5v voltage while at the same time preserving unaltered the level of current in the primary sender wires? If I can measure current, translate it into a voltage, and not tamper with the amount of current in the line, then I can track intake temp without interfering with the dash-mount gauge readings.

Thanks for any suggestions. Ideally when complete I will be able to use the LM-1 and RPM Converter to log the following:

1) AFR
2) RPM
3) EGT
4) Knock
5) Intake temp
6) Other: MAF voltage, turbo output to IC temp, status of water injection, etc.

-- Scooter
* Registered users of the site do not see these ads.
scooterforever is offline   Reply With Quote
Old 01-12-2006, 12:03 AM   #2
Jon [in CT]
*** Banned ***
 
Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
Vehicle:
02 WRX Sedan
Silver

Default

Quote:
Originally Posted by scooterforever
Next project: tapping into the EGT probes from my Autometer EGT gauge so I can track exhaust gas temps. This requires an additional circuit (using an Analog Devices temp circuit) and using type K thermocouple wire (as regular copper will create voltage noise and throw off the EGT readings).
I presume you'll be using an AD595 chip for EGT. Why not buy/build a cheap Type J thermocouple for your IC temps and use the AD594 chip?
Jon [in CT] is offline   Reply With Quote
Old 01-12-2006, 12:11 AM   #3
scooterforever
Scooby Specialist
 
Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:
2002

Default

Quote:
Originally Posted by Jon [in CT]
I presume you'll be using an AD595 chip for EGT. Why not buy/build a cheap Type J thermocouple for your IC temps and use the AD594 chip?
That would work, but I already have two temp probes tapped into the IC, and I'd rather not remove it anymore. It's a little bigger than I'd like for easy access. That plus cast aluminum is finicky to drill/tap. I'd love to use the AD595 for the EGT conversion, and add other circuits to tap into the current.

Though... is the type J thermocouple flexible? If so, I could always insert it under the TB coupler. AD595's aren't that expensive.

Thanks Jon, keep the ideas coming!
scooterforever is offline   Reply With Quote
Old 01-14-2006, 03:53 PM   #4
BrettS
Scooby Newbie
 
Member#: 73854
Join Date: Nov 2004
Chapter/Region: SCIC
Location: Oceanside, Ca
Vehicle:
2002 WRX
Midnight black pearl

Default

Quote:
Originally Posted by scooterforever
So I just got an LM-1 and love it. I am using the RPM Converter to log RPMs, but it will also accept up to 5 additional 0v to 5v signals (including RPMs).

-- Scooter

where did you tap into for the rpm signal? I finally found my rpm converter in the garage and need to hook it up. Thanks-
BrettS is offline   Reply With Quote
Old 01-14-2006, 05:04 PM   #5
scooterforever
Scooby Specialist
 
Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:
2002

Default

Quote:
Originally Posted by BrettS
where did you tap into for the rpm signal? I finally found my rpm converter in the garage and need to hook it up. Thanks-
I tapped into the RPM signal wire from the ECU. There are pin-outs (at least for MY02's) at www.projectwrx.com in the modification section. Basically I just pared back some of the insulation for the signal wire and wrapped a wire to the LM-1 / RPM Converter around the exposed connection. Then wrapped it all with electrical tape. I know... should have soldered it... anyway.

Configuring the RPM Converter on the LM-1 is super easy. Basically hold the rpm's at 2,000 and press the setup button.
scooterforever is offline   Reply With Quote
Old 01-14-2006, 08:41 PM   #6
BrettS
Scooby Newbie
 
Member#: 73854
Join Date: Nov 2004
Chapter/Region: SCIC
Location: Oceanside, Ca
Vehicle:
2002 WRX
Midnight black pearl

Default

thanks- I tapped into pin 9 on the B136 connector, and had been trying to get the rpms right, but havent had any luck- it keeps reading 10000 rpms and stuff like that- Ill try the auto cal in a little bit.


Thanks again!
BrettS is offline   Reply With Quote
Old 01-15-2006, 01:24 PM   #7
scooterforever
Scooby Specialist
 
Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:
2002

Default

Yeah, when I say "configuring the LM-1 is super easy" what I left out was the fact that it took me an hour and a half of trying to configure it manually -- and getting rpms of 10,000 -- until I realized there was an auto configure approach.

The current headache I have is that I have tapped into my Autometer EGT wires with type K wire (alumel and chromel as opposed to copper) and am trying to wire an amplifier with an AD595 chip so I can log EGTs but... can't seem to get it wired right. And I think I fried my first AD595 chip; a backup arrives next wee.
scooterforever is offline   Reply With Quote
Old 01-15-2006, 05:00 PM   #8
scooterforever
Scooby Specialist
 
Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:
2002

Default

So I got MAF and IDCs to log. Attached is a log of a second gear into third gear pull. You can see how the TCU/ECU pull fuel on the upshift, and you can also see the resulting spike in AFRs. MAF voltage stays level through the shift, as the engine remains under load.

Legend:
Green = fuel IDCs, with 0v = 0% IDC and 5v = 100% IDCs
Orange = MAF voltage
Black = RPMs in 1,000s
Pink = AFRs
Red = KnockLink voltage. Knock shows up as 0.7 volts. Although it registered some knock on this pull, I attribute it to noise because AFRs were very tame (save perhaps the bump up on the shift).

Now I just need to figure out how to log EGTs!

scooterforever is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help with tactix 2.0 and rom raider logger srtFOURplay Open Source Reflashes 5 12-30-2008 04:28 PM
Wideband Specials: Innovate LM-1 and more! SubaruStore.com Gauges & Electronics 2 02-07-2008 07:37 PM
LM-1 and Emanage GregBolby Engine Management & Tuning 2 02-20-2005 11:30 AM
Crossdressing fun with lycra, rubber masks, and boots incorporeal Off-Topic 1 12-01-2004 10:49 PM
Fun with Ether (Starting fluid) and sawz-all's rhdude Off-Topic 25 11-26-2004 10:44 AM


All times are GMT -4. The time now is 10:35 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.