Holley EFI Cam Sync with Diagram - Yellow Bullet Forums
;

Go Back   Yellow Bullet Forums > Technical Section > Electrical

Reply
 
Thread Tools Display Modes
Old 07-26-2012, 01:09 PM   #1
bigd427w
Boss
Smoked another BBC
 
bigd427w's Avatar
 
Join Date: Dec 2008
Location: KY
Posts: 2,094
Default Holley EFI Cam Sync with Diagram

CRANK/CAM SENSOR INSTALLATION AND SETUP

The following information is used to assist with the proper installation and setup of various crank and cam sensors and hardware. Most of these settings are setup as a “Custom” ignition type in the software.

NOTE: You should have a balancer this is fully degreed or a timing tape installed on the balancer to perform the following settings.


1.0 CRANK SENSOR SETUP

1.1 Ignition Reference Setup – “one pulse per fire” trigger, Magnetic Pickup

The following shows how to set up the crank signal for a “one pulse per fire” RPM input using either a magnetic pickup crank trigger or distributor. A “one pulse per fire” trigger means there is one sensor pulse for every cylinder firing (on a V8 this would be a 4 pulse crank trigger or a 8 pulse trigger in the distributor).

Note: In the software, the Sensor Type should be set up as “Magnetic”.
  • Note the ignition reference angle set in the software. This is typically set to a value that is 10 more than the highest timing you will run. Do NOT set it higher than 75. 60 is a common value. 60 will be used for an example here.
  • Turn the engine over so that it is at the ignition reference angle. For this example it would be 60 degrees BTDC on cylinder #1. The timing pointer should be indicating 60 degrees BTDC on the crank.
  • Align/turn the crank trigger or distributor so that the sensor is perfectly inline with the trigger.
  • For a magnetic pickup crank trigger, this means the pickup and a magnet should be inline.
  • For a magnetic pickup distributor, this means having one of the reluctor teeth line up with the magnetic pickup.
  • Tighten everything up.
  • If you are not using a cam sync (if you are, continue to section 2.1), everything should be set close enough to start the engine. It is recommended that you disconnect the injectors and crank the engine over. Look at the timing with a timing light. It should be firing at the cranking timing value shown on the data monitor. If it is off a few degrees, you can move the pickup slightly, or change the Ignition Reference setting to sync things up. If you change the Ignition Reference value, note that you must cycle the ignition power for it to take affect.
1.2 Ignition Reference Setup – “one pulse per fire” trigger, Hall Effect Pickup

The following shows how to set up the crank signal for a “one pulse per fire” RPM input using either a hall effect pickup crank trigger or distributor. A “one pulse per fire” trigger means there is one sensor pulse for every cylinder firing (on a V8 this would be a 4 pulse crank trigger or a 8 pulse trigger in the distributor).

NOTE: In the software, the Sensor Type should be set up as “Digital Rising” or “Digital Falling”.
  • Note the ignition reference angle set in the software. This is typically set to a value that is 10 more than the highest timing you will run. Do NOT set it higher than 75. 60 is a common value. 60 will be used for an example here. Turn the engine over so that it is at the ignition reference angle. For this example it would be 60 degrees BTDC on cylinder #1. The timing pointer should be indicating 60 degrees BTDC at the crank.
  • Align/turn the crank trigger or distributor so that the sensor is aligned properly. In the software, the signal should be set up as “Digital Rising” or “Digital Falling”. A hall effect sensor typically uses a “shutter window/wheel” that has “openings” and areas of material that are in close proximity to the sensor that triggers the sensor output. Or it uses a toothed wheel that has “teeth” and “gaps”.
When the sensor sees the edge of an “opening” or a “gap”, this triggers the sensor in a “Falling” manner. When the sensor sees the first edge of the material or tooth, this trigger the sensor in a “Rising” manner.

To set the hall effect pickup properly:
  • If set as “Digital Rising”, the pickup should be located such that the sensor is aligned where the shutter window/wheel or tooth edge first hits the center of the hall effect sensor. If set as “Digital Falling”, the pickup should be located such that the sensor is aligned where the “opening” in the window/wheel is or the tooth gap starts (also meaning where the sensor leaves the edge of the shutter window/wheel or tooth edge).
  • Tighten everything up.
  • If you are not using a cam sync (if you are, continue to section 2.1), everything should be set close enough to start the engine. It is recommended that you disconnect the injectors and crank the engine over. Look at the timing with a timing light. It should be firing at the cranking timing value shown on the data monitor. If it is off a few degrees, you can move the pickup slightly, or change the Ignition Reference setting to sync things up. If you change the Ignition Reference value, note that you must cycle the ignition power for it to take affect.
1.3 60-2 Wheel

The following covers the installation of a 60-2 crank trigger wheel Holley offers. Holley offers kits for Small and Big Block Chevy engines to mount the sensor and wheel. Four different diameter 60-2 wheels are available that can be custom mounted on any engine.

The “60-2” alludes to the fact that crank trigger wheel has 58 teeth with “2 missing”. This is also known as a “58x” wheel. The “missing” teeth are used as an ident so that the ECU can recognize the exact angular position of the crankshaft. Having 58 teeth allows the ECU to much more precisely calculate engine speed compared to a trigger wheel with less teeth.

To set up a 60-2 wheel:

1. Rotate the engine to #1 TDC.

2. The software has a parameter called “TDC Tooth Number”. This is typically set to “10”. The example below will use 10 as this value. Do not set it below a value of 9 for best timing accuracy. Values higher are acceptable, but you need to make sure the cam sensor is installed appropriately if one is used (see section 2.2).

3. With the engine at TDC on #1 cylinder, the sensor will be positioned such that it is lined up with the “TDC Tooth Number” (for this example 10). This is the 10th tooth “after the missing teeth” on the crank trigger wheel in the direction that the engine rotates. Install the crank trigger wheel and align the bolt holes on it such that the sensor will be near this position.

Most all engines rotate clockwise, except for Honda engines which rotate counter-clockwise. If you are confused about which tooth this means, put the trigger wheel on the engine and rotate just the trigger wheel (leave the engine at TDC on #1) in the direction the engine rotates. Rotate it until the missing teeth/gap line up to where the sensor will be mounted, then continue turning it and count 10 teeth. Take a marker and mark this tooth. It will be the tooth you need to align with the sensor.



2.0 CAM SYNC POSITIONING

A cam sync pulse is required if you are running sequential fuel injection. This tells the ECU which cylinder is cylinder #1 (or the first cylinder in the firing order as entered in the software). The following describes setting this up for a “one pulse per fire” crank input as well as a “60-2” crank input.


2.1 Cam Sync setup when using a “one pulse per fire” crank input

For a "one pulse per fire crank” signal (ie a 4 pulse crank trigger on a V, the cam sync signal must occur in a specific range to properly ident which cylinder is cylinder #1. If this is not done properly, individual cylinder trims will not be performed on the correct cylinder, or worse, if using individual coils, the wrong cylinder will be fired, potentially damaging the started, flexplate, or worse.

The best way to determine the proper range is by using the following basic formula to determine the crank angle range that the cam ident can occur. An example is give afterwards along with a table that has certain combinations already calculated.


Cam sync location (degrees BTDC #1) = "Ignition Reference Angle" + “A” + (“A” / 2)




“Ignition Reference Angle” = Taken from Crank Sensor Setup in software


“A” = Angle Between Crank Pulses (crank degrees between triggers on the crank sensor)

“A” for a 8 cylinder = 90
“A” for a 6 cylinder = 120
“A” for a 4 cylinder = 180


Using the formula above, plug in the “Ignition Reference Angle” you are using and the proper “A” value depending on the number of engine cylinders. The location calculated is the “ideal” location and can vary +/- 30 degrees or possibly more. If you are out of this range contact Holley Tech Service for options.



Example - 8 cylinder with a Ignition Ref Angle of 60

Cam Sync Location = 60 + 90 + 90/2 = 195 degrees BTDC #1
Cam Sync Location = 60 + 90 + 45 = 195 degrees BTDC #1

195 would be the centrally "perfect" location for this specific example. However, this location can vary by +/- 30 degrees from this nominal target value with no issue.




Number of Cylinders Ignition Reference Angle Cam Trigger Location Range (BTDC #1)
4 60 330 +/-30 degrees
6 60 240 +/-30 degrees
8 60 195 +/-30 degrees


2.2 60-2 Cam Sync when using a 60-2 crank input

When using a 60-2 crank sensor wheel, this cam sync signal trigger MUST occur:

· Before cylinder #1 is at TDC on the COMPRESSION STROKE, make sure that it is not occurring on the exhaust stroke.

· It also MUST occur at least 8 teeth (approximately 50 degrees) before the “missing teeth” are read by the crank position sensor. If the crank sensor is set up such that the 10th tooth after the missing teeth is at TDC, position the cam sensor such that it is between 110 -250 degrees before TDC on cylinder #1. This will create a proper position.

This cam sync input can be configured as a magnetic or hall effect (digital rising or digital falling) input in the software. Make sure that if you are using a hall effect sensor, you have this set up properly as a rising or falling signal.

bigd427w is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-26-2012, 10:05 PM   #2
RTRBURN
Senior Member
Smoked another BBC
 
RTRBURN's Avatar
 
Join Date: Jul 2009
Location: Bowling Green
Posts: 1,602
Default Re: Holley EFI Cam Sync with Diagram

Thanks Derek
RTRBURN is offline   Reply With Quote
Old 07-26-2012, 10:53 PM   #3
cam406406
Senior Member
Smoked another BBC
 
cam406406's Avatar
 
Join Date: Feb 2007
Location: Lombard illinois
Posts: 1,587
Default Re: Holley EFI Cam Sync with Diagram

Ok but where do I set the rotor in relation to the sensor in the distributor?
cam406406 is offline   Reply With Quote
Old 07-27-2012, 12:57 AM   #4
Sb2.2Z28
Member
Pullin gears
 
Sb2.2Z28's Avatar
 
Join Date: Aug 2010
Posts: 862
Default Re: Holley EFI Cam Sync with Diagram

I think the rotor would be pointing at the sensor when the motor is at 195deg before TDC.
__________________
Sb2.2Z28 is offline   Reply With Quote
Old 07-27-2012, 01:27 AM   #5
Doug F
Senior Member
Smoked another BBC
 
Join Date: Jan 2008
Posts: 1,033
Default Re: Holley EFI Cam Sync with Diagram

The rotor has nothing to do with the crank and cam sensors. You phase the rotor (ie point the rotor at a post on the cap) at the timing you run at WOT.
Doug F is offline   Reply With Quote
Old 07-27-2012, 09:19 AM   #6
Meatz
Junior Member
Launchin
 
Join Date: Aug 2010
Location: KY
Posts: 334
Default Re: Holley EFI Cam Sync with Diagram

Quote:
Originally Posted by Doug F View Post
The rotor has nothing to do with the crank and cam sensors. You phase the rotor (ie point the rotor at a post on the cap) at the timing you run at WOT.
WOT or max torque with a blower setup?
Meatz is offline   Reply With Quote
Old 07-27-2012, 11:42 AM   #7
Danny Cabral
Senior Member
Smoked another BBC
 
Danny Cabral's Avatar
 
Join Date: Jan 2010
Location: Connecticut
Posts: 2,452
Default Re: Holley EFI Cam Sync with Diagram

Where there's the most cylinder pressure.
__________________
May God's Grace Bless You

New Holley Dominator ECU for sale every month. (Email me for my usual low price: d c f 1 5 0 @ c o m c a s t . n e t)
Danny Cabral is offline   Reply With Quote
Old 07-27-2012, 10:24 PM   #8
bigd427w
Boss
Smoked another BBC
 
bigd427w's Avatar
 
Join Date: Dec 2008
Location: KY
Posts: 2,094
Default Re: Holley EFI Cam Sync with Diagram

Thanks for posting up guys. I appologize for not following up, but it's been a hectic day.
bigd427w is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-27-2012, 11:26 PM   #9
cam406406
Senior Member
Smoked another BBC
 
cam406406's Avatar
 
Join Date: Feb 2007
Location: Lombard illinois
Posts: 1,587
Default Re: Holley EFI Cam Sync with Diagram

I can still use some help
cam406406 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



All times are GMT -4. The time now is 11:40 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 0%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Yellow Bullet LLC
 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.