Part Throttle Timing - Advantages/Disadv.
Part Throttle Timing - Advantages/Disadv. What are the advantages/disadvantages of bumping timing in each cell until pinging occurs, then back off a few degrees at part throttle?
I have been wondering this myself....
you will have to change your MAX KR VS Map and VS Rpm tables so that they will reduce timing in those areas...
I guess advantage would be a little better response at part throttle, maybe even a little more power...noticeable???? dunno.....
disdvantages- might not do squat...might grenade your engine...might knock like hell and damage something...will take forever to really tune right...need to do it in so many possible weather and load conditions to guarantee safety
you will have to change your MAX KR VS Map and VS Rpm tables so that they will reduce timing in those areas...
I guess advantage would be a little better response at part throttle, maybe even a little more power...noticeable???? dunno.....
disdvantages- might not do squat...might grenade your engine...might knock like hell and damage something...will take forever to really tune right...need to do it in so many possible weather and load conditions to guarantee safety
Maximizing spark maximizes torque, up to a point that
is about 2 degrees before onset of detonation. So why
not?
That's exactly how I tweaked in my timing table. Add
where the histogram shows no KR (Spark Retard, "max"
mode) and subtract where it does, until the histo is
mostly 1 degree retarded. Then take out 3 degrees
and you're good.
You want to distinguish between transient ping from
things like a poorly tuned VE table or late PE roll-on,
and ping in steady-state or steady-TPS conditions.
The main table is for steady TPS / steady MAP and
any transient problems you'd want to fix by enrichment
or burst knock cover-ups.
The IAT and ECT adder tables should be able to cover
the environmental effects, although you might need to
adjust these (I found I had to pull out more spark for
ECT, once I had tuned the main table to the bone for
normal driving, Georgia hills in July w/ A/C on and 200+F
ECT was ping city. So I got more aggressive in the ECT
table pullout to settle that down. Better than living with
less spark all year 'round).
It is time consuming. But it's a hobby.
is about 2 degrees before onset of detonation. So why
not?
That's exactly how I tweaked in my timing table. Add
where the histogram shows no KR (Spark Retard, "max"
mode) and subtract where it does, until the histo is
mostly 1 degree retarded. Then take out 3 degrees
and you're good.
You want to distinguish between transient ping from
things like a poorly tuned VE table or late PE roll-on,
and ping in steady-state or steady-TPS conditions.
The main table is for steady TPS / steady MAP and
any transient problems you'd want to fix by enrichment
or burst knock cover-ups.
The IAT and ECT adder tables should be able to cover
the environmental effects, although you might need to
adjust these (I found I had to pull out more spark for
ECT, once I had tuned the main table to the bone for
normal driving, Georgia hills in July w/ A/C on and 200+F
ECT was ping city. So I got more aggressive in the ECT
table pullout to settle that down. Better than living with
less spark all year 'round).
It is time consuming. But it's a hobby.
