Question: for V[%] should displacement include combustion chamber volume...?
For 243 heads, CCV is about 0.5L (for 8 chambers).
Edit: it seems displacement should include only the swept volume, see post #16 below, thanks 5.7ute/Mick.
Question: for V[%] should displacement include combustion chamber volume...?
For 243 heads, CCV is about 0.5L (for 8 chambers).
Edit: it seems displacement should include only the swept volume, see post #16 below, thanks 5.7ute/Mick.
Last edited by joecar; November 24th, 2010 at 06:20 AM.
joe, are you trying to put me out of work?
lol...
Marcin, this is just a Cliff's Notes style quick reference summary, whereas your Tuning Tools, Writeups, and Experiments is a detailed explanation/discussion linking theory and practice and goes into the motivations of why certain actions should or should not be taken during tuning...
I am not able to even try to put you out of business.
I agree with Post #4 as edited..
Thanks Joe..So far it seems not many have commented on it (PE vs OLFA & EVAP). Certainly is true with OS 12212156. Maybe it was a 2002 Emissions difference..No EGR, etc..
Well, thanks for updating. Its good work. We appreciate it..
IBPW is the commanded injector pulsewidth, the scantool provides pids for this (IBPW1, IBPW2, INJDC1, INJDC2).
IPW is the internal injector pulsewidth as would be computed by the PCM before converting it to IBPW.
This is how IBPW appears to be computed from IPW:
(table name is shown as a green comment following the table id)Code:IFR = lookup(B4001)(injector flow rate); IPW = airmass / AFR / IFR * 1000; IPW = IPW + TF(transient fueling modifiers); if IPW <= B9021(minimum transient pulsewidth) then IPW = B9021; else if IPW <= B4003(minimum pulsewidth) then IPW = B4004(default pulsewidth); else if IPW < B4006(small pulse threshold) then IPW = IPW + B4005(small pulse adder); end IPW = IPW + B3701(voltage/manvac offset); IBPW = IPW;
This is important because correctly modeling the injectors is critical, it allows the rest of the tuning exercise to correctly fit into place, and it allows dynamic fueling (i.e. port wall wetting/evaporation) to work properly.
5.7ute has performed some difficult and time consuming experiments to arrive at that sequence, good job Mick
See here: showthread.php?13364-IBPW-B4005-B3701-correlation
Last edited by joecar; September 29th, 2011 at 01:49 PM.
Thanks guys. It has taken a while, but with the help of a few forum members sending logs & making experimental changes we are starting to get there.
Only 4000 tables left for you to write pseudo code for Joe. Then we can look at the 1mb pcm's lol.
The Tremor at AIR