crank trigger issues with ls1 - ls2 sensors Link Thunder

Hi there

We have had an ls1 running for 2 seasons no issues. well apart fro a bent rod end of last season.. that aside

we have swapped out to stroker ls2. Crank came with a 24x wheel

engine loom has stayed the same. so 12v feed to both crank and cam.

Crank is 24x the dual style wheel.. sensor is the ls1 sensor 12v feed.

Cam is a 4x with a ls2 sensor (requires 5v) but is working on 12v (i am going to put this to a 5 volt feed but it seems to work fine) I've done the wire swap to the sensor as the power is switched between ls1 and ls2 sensors. (loom extended)

the engine ran great for 60 seconds with a few trigger errors.

Tried again today to check on the trigger errors and now it runs but for a very short period with some rpm spikes to 20000rpm ign cut takes over and shuts engine down. a fair few trigger errors

I have checked the trigger scope and the crank and cam are falling and rising at almost exactly the same time.

could the voltage reduction help? i don't really want to cut into the loom unless i have to, the wires currently wont stretch for a re-pin. I don't really see how it would but worth an ask... apart from potential sensor failure.

trigger mode ls1 5-10

rpm filtering 1

trig 1 hall

filterin 2

pullup on

edge rising

trig 2 as above

scope attached

Thanks for looking

Tried again today and car now runs with no random rpm jumps although still has some crank trigger errors. as it ran i took a trigger log.

I didn't change a thing just a different day. so ?

Any ideas on the trigger log would be appreciated.

Thanks

Looking at the trigger scope (set up to rising) the two long 'pulse' sync points are too close meaning any slight variation is going to throw up a error... ? this is correct right ?

if that is the case how on earth do i solve that issue ? its only the two long sets that seem to line up causing the issue the other 2 smaller are fairly close to 50% or good enough.

I cant win with either falling or rising as on that one cam 'tooth' it traces both almost perfectly.

So after talking to Scott and Adam from link.

seems it’s the only combination of crank and cam trigger patterns that doesn’t work.

24x crank with a 4x cam is a no go as the trigger pattern sync between crank and cam can’t work without errors due to the signal position. So if you have a 24x crank then go with a 1x cam sprocket. If you know you know I guess.

Well done getting to the bottom of this! Hopefully the cam sprocket conversion wasn't too costly.