Crank and Cam Trigger Sync on LS7

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SteveA
Posts: 3
Joined: Tue Nov 17, 2020 11:58 am

Crank and Cam Trigger Sync on LS7

Post by SteveA »

I have a newly installed Syvecs S7, which was supplied to me with a base calibration for my GM LS7 engine. The initial attempts at cranking won’t start and the triggers are not in sync. I get:

SYNC: 0->TURN
SYNC: TURN->360
SYNC: 360->0(LONG TOOTH GAP)

I went through the Syvecs help video for Crank and Cam Setup, to check settings and couldn’t see anything obviously wrong. I have not experimented with changing many settings yet as I am inexperienced, and this was supplied as a calibration that was supposed to work for my engine.

However, if there is anything wrong with the configuration, then I am hoping somebody experienced here can spot it right away. Below are the configuration settings in the ECU and attached is a validation log file from cranking events.

Any help/guidance about what to check next would be greatly appreciated!

Crank Sensor
Pin: AN01
Type: 5V Bipolar
Input Filter: Off
High Trigger Threshold: 100-500rpm/0.75V, 1000rpm/1V, 2000-10000rpm/2V
Low Trigger Threshold: 0V
Signal Trigger Edge: Falling
Reference Angle Adder: 0

Cam Sensor
Pin: AN02
Type: Thermistor
Input Filter: Off
High Trigger Threshold: 3.75V
Low Trigger Threshold: 1.25V
Signal Trigger Edge: Rising

Generic Crank and Cam Setup
Number of Crank Teeth: 58
Number of Crank Tooth Gaps: 58
Crank Reference Tooth Angle: 289°
Crank Tooth Gap Widths: 0/6°, 1/18°, 2-57/6°
Crank Tooth Gap Min: 0/3°, 1/9°, 2-57/3°
Crank tooth Gap Max: 0/9°, 1/26°, 2-57/9°
Crank tooth Gap Repeats: 0

Engine Configuration
Crank and Cam Type: Generic Single Gap Single Cam
Gap Ratio A/B: 1.5
Gap Validation: Disabled
Gap Validation ratio: 1.5
Omit Gap Detection Validation Revolution: Yes
Cam A Angle: 0°
Attachments
Crank221120.txt
(228.78 KiB) Downloaded 24 times
stevieturbo
Posts: 982
Joined: Sun Dec 07, 2008 2:04 pm

Re: Crank and Cam Trigger Sync on LS7

Post by stevieturbo »

I don't see why your crank low trigger threshold is at zero, as a hall sensor will never cross the zero line ?

Change those thresholds to say 1.25v for both cranking and running

And also ensure manual cam checklist is enabled and setup for the cam trigger.
1.57 LS7 DBW.SC
S6Plus LS7 base cal. Compare settings to this.
(315.02 KiB) Downloaded 32 times
SteveA
Posts: 3
Joined: Tue Nov 17, 2020 11:58 am

Re: Crank and Cam Trigger Sync on LS7

Post by SteveA »

Thanks for posting. Will check.
Ryan.g
Syvecs Staff - Caretaker
Posts: 296
Joined: Fri May 30, 2008 3:05 pm

Re: Crank and Cam Trigger Sync on LS7

Post by Ryan.g »

This cal must of been converted from a S6 i would say and gone to the Default Values.

Set the Low at 1v and High at 3v across all RPM points and should be fine then
SteveA
Posts: 3
Joined: Tue Nov 17, 2020 11:58 am

Re: Crank and Cam Trigger Sync on LS7

Post by SteveA »

Thanks for the reply Ryan, sorry I didn't see it earlier. I ended up sending the car to a tuner who has it sorted now.
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