Hello guys,
this is my first thread on this board.
I'm thinking to the safe knock limit based on real experience.
This is mine:
After you can see a pic of a log of a full 4th gear on a dyno. 93vr4 , Stock boost, kn filter, catback exhaust, stock fuel system. After 5500rpm you can see up to 12 counts of knock and that with 100ron fuel..shell v-power here in europe which is the best pump gas we have I think 93-95 octane of USA fuel.
Anyone as some logs of the stock car in 3rd and 4th gear?..
After some years of experience, spark plug reading on my car I think that up to 10-12 knock counts is tolerated by the factory in the design stage of the 6g72 and that kind of knock mustn't scare no one.
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And after there is a pic of a 3rd gear on highway with 15 knock counts with this set-up:
13g turbos,stock intercoolers
fuel system: 450s, safc, methanol/water inj, hotwired walbro
Boost: spike at 19psi but not more than 15 to redline (this is the max for that turbos)
Fuel used in the run: shell v-power 100RON , toluene 10%, methanol in tank 5%, water/meth 550cc nozzle with 80 meth, 20 water
DAMN!! HOW it can knock with that fuel and that boost???
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this second run is in 3rd gear because in 4th the speed is too high for my street and because in 4th at 5500+ rpm i have 20 counts of knock.
What do you think??
Watching spark plugs I can see very very little signs of detonation.. some very little spots on the porcelain and on the ground electrode..
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