How much knock on S-afc 2 is safe?

[Giallo spyder met]

My S-afc is showing up to 35-40 on full boost at 7500-8000rpm.I was woundering how much is safe on the knocking scale?

[themadscientist]

"How much knock is safe"? sounds similar to "how long can I stare at the sun"? You should investigate to see if the engine is actually knocking or if the unit is actually picking up valvetrain noise. Check your plugs for signs and if it is knocking correct the situation immediately.

[r34 gtr]

mine reads a ton but i never get any actual knock. the safc is freaking dumb as a rock.

[c-rad]

Do not use the knock reading on the safc for ANYTHING.

[Giallo spyder met]

But how much do you read on your S-afc knocking scale?

Do not use the knock reading on the safc for ANYTHING.

[r34 gtr]

depends on how long the car has been running for me. the longer ive been driving the higher it is. temp. dependent too, i see upwards of 35 on a hot day with normal driving. it never knocks, and the one time it did the safc didnt notice it.

just listen to the car, if it sounds like you are getting pre-ignition then make her a bit richer. i just went around dogging it and messing with the safc until it didnt sound like it was detting anymore.

[Logan76]

Giallo, quick offtop question, are those just stock tails with some black film over them?

[Giallo spyder met]

Yes its standard tail lights painted with homemaked special paint so it match the roof , bonnet and rims.

[dash]

zerothread/227005last post... he seems to have found some use for SAFC knock meterAn asset if it'll work. Too bad we can't datalog 'knock' like a DSM and compare to a safc, to get an idea of the thresholds... I'm wondering if they(DSMs) ever did.

[Giallo spyder met]

depends on how long the car has been running for me. the longer ive been driving the higher it is. temp. dependent too, i see upwards of 35 on a hot day with normal driving. it never knocks, and the one time it did the safc didnt notice it.

just listen to the car, if it sounds like you are getting pre-ignition then make her a bit richer. i just went around dogging it and messing with the safc until it didnt sound like it was detting anymore.

On my last engine i never heard a noice or sound but the piston had spikemarks on the top.

And now i have solid engine and gearboxmount and stript out interial just painted metal so how im i going to hear knocks from the engine?

[r34 gtr]

awesome! guess mine is kinda doing its job then. too bad my msII will tell me the same in a way less retarded manner.