Originally Posted by
G2RSR
interesting i want to learn about ignition tables i know about afr, so what does the numbers mean at the side going from 25.0 to 280.0 ?
MAP
Originally Posted by
Canada1
Hello Karlos
Thank you for your timing map.
What compression ratio does your engine have? I seem to remember it was less than 8:1?
It looks like your map shows 20 to 23 degrees advance between 4000 and 7000 rpm at 15 psi boost.
Have you monitored exhaust gas temperatures? Do you have a knock sensor?
Did you have to take any timing out at the engine torque peak rpm?
I have heard that is where an engine is very sensitive to ignition timing.
Cheers
Perry
Slightly higher than stock CR (8.5:1) as I've had the head skimmed twice and the block decked too.
No EGT monitor, no knock sensor (mapped with Det Cans).
I gradually increased timing to the point of Det and then pulled back a couple of degree's, have no way of mapping to MBT as I dont have a Dyno.
Originally Posted by
Rob_DOHC
Pretty sure Karlos is running standard CR Perry, IMO peak load is always timing critical.
Rob,
Yup!
Peak VE is where is where you will get Det and so timing is critical, unless you have a massive boost spike early in the revs of course
lol
You can see where peak VE is by your fuelling table, where it needs the most fuel.
Originally Posted by
chaffe
another point is the base timing of your engine may have a few degrees variation, thus making the exact timing numbers non transferable
Shouldnt be, not if you have set it correctly.
But it's still always a good idea if you are going to rob my table (or anyones) to retard 5 or so degrees before you start mapping anyway, far too many variables between engines!