Unexpected Missing tooth

[driftkids]

Struggling with my S54B32

in the dyno a few days ago it started to cut at 5700rpm

we found out it had Unexpected missing tooth error at 3500-3700 rpm

tried different settings on trigger and best result were

Adaptive threshold: LOW
Pullup/Pulldown: None
Input Filter: None

and Crank detection scale 70%

with these settings the unexpected missing tooth error appeared at around 4500rpm

I also added 1K ohm at the VR sensor signalwire, that raised the unexpected missing tooth error to 5500 rpm, and the car revs up to 6500rpm.

Does anyone have had a similiar situation or have any suggestions here?

[Karel]

you are for sure using stock wiring huh ?

use high quality shielded twisted cable for cam and crank sensors and you will be fine without any resistors.

stock wiring sucks

[driftkids]

Its not stock wiring, i built a standalone harness


Im usibg raychem shielded wire on the crankv(vr sensor)
On the camsafts sensora (hall) i dont use shielded

[gregpe]

10k resistor in series in primary trigger will do the job.

[RHD]

try using "next edge rejection angle" filter you will not be able to go any higher than 5 and even that might make it hard to start but try lower value, that usually does the trick too.

[driftkids]

tried changing rejection angle, on 1,2,3 it was the same as before, on 4 and 5 it randomly stopped and was giving prime trigger noise error

will test with 10k ohm in serial tomorrow, if no other settings could do the trick ?

[Karel]

I am really curious why do you play with setting, resistor etc.... you have everything right, only your wiring is shit, so change the cable for this sensor and done

[driftkids]

I am really curious why do you play with setting, resistor etc.... you have everything right, only your wiring is shit, so change the cable for this sensor and done

changed my "shitty wiring" with brand new shielded cables.. all the same

added after that a 5.6k ohm resistor on the triggersignal wire. it now rev`s like a wild cat!

[Karel]

funny, i really dont need any resistors if the wirring is high quality... but anyway glad to see you are fine now

[driftkids]

I have heard from more people that they need to install resistors on the s54 engines to get the trigger working properly.

Also for guys running maxxecu aswell

[WHPZach]

funny, i really dont need any resistors if the wirring is high quality... but anyway glad to see you are fine now

Resistors are needed on some signals, even with high quality shielded wire. With a VR sensor, the voltage output at high rpm can exceed what the EMU/EMU Black is capable of reading.

[gregpe]

I am really curious why do you play with setting, resistor etc.... you have everything right, only your wiring is shit, so change the cable for this sensor and done

changed my "shitty wiring" with brand new shielded cables.. all the same

added after that a 5.6k ohm resistor on the triggersignal wire. it now rev`s like a wild cat!

thats what i've suspected..