OS-Mike
December 12th, 2014, 11:36 AM
Hi im Mike i live in New Zealand im a mechanic still new to efi live but no stranger to tuning. I use to have a dyno at my workshop but i didnt use it alot so it got sold to buy more useful equipment a few months ago. Anyway i have a work car a holden statesman with a ls1 with a 232/236 cam in it dyno tuned it fine but never got it to idle perfect its hard to start when its hot and stalls when putting it into gear when its cold.
So how is everything calculated? ill try break it down but have some parts i cant work out. So if anyone can help me fill in gaps add details and tell me if im wrong it will be very helpful.
So first of all VE table and spark are done and im just trying to get my head around how it makes adjustments. To make it easy well say the engine is at operating temp, closed loop, Idle mode, In park.
Desired idle speed (Target 850Rpm)
Desired airflow (Target 10 G/s)
Base spark (Target-24)
RPM Air flow control (60rpm/1.8sec)
<Rpm set point adjust>
Under/Over speed timing correction (-10/+10)
Air flow learning (60rpm/1.5sec)
Short term idle trim (+/- 1G/s)
Actual idle speed
Is this how it works if so how does it decide between ign timing or air flow? Is it possible to change it to say just spark control or just air control? How is Rpm set point adjust changed eg. 0= no correction 5=some 10=alot?
Cheers
So how is everything calculated? ill try break it down but have some parts i cant work out. So if anyone can help me fill in gaps add details and tell me if im wrong it will be very helpful.
So first of all VE table and spark are done and im just trying to get my head around how it makes adjustments. To make it easy well say the engine is at operating temp, closed loop, Idle mode, In park.
Desired idle speed (Target 850Rpm)
Desired airflow (Target 10 G/s)
Base spark (Target-24)
RPM Air flow control (60rpm/1.8sec)
<Rpm set point adjust>
Under/Over speed timing correction (-10/+10)
Air flow learning (60rpm/1.5sec)
Short term idle trim (+/- 1G/s)
Actual idle speed
Is this how it works if so how does it decide between ign timing or air flow? Is it possible to change it to say just spark control or just air control? How is Rpm set point adjust changed eg. 0= no correction 5=some 10=alot?
Cheers