Quote:
Originally Posted by veyron1  MAP is Hg. Pressure. Air density is read as temperature. IAT. Hence the mentioning as different parameters. But how is AFR IPW taken as one? IPW is computed from others for appropriate AFR, correct? |
IPW is computed from a lot of parameters , including target AFR and feedback from existing AFR(for closed loop only).
To make it simple, speed = RPM, density = manifold pressure (as you said), but air temp, engine temp, altitude, AFR,VE,etc come in as correction factors..
Quote:
| Right. But I'm still not quite sure we're on the same track here. By computed quantity, you mean the actual or residual values for intake at the ECM end for calculating IPW, correct? |
I am lost too
... I was referring to errors you mentioned regarding vacuum..well, computed quantity is residual exhaust/overlapped charge + fresh charge with all corrections in place..
Quote:
| Neat. So here's a doozie. What happens for TC/SC applications, where we have to monitor boost as well via MAF (if we try to use ITB as well, that is) ? ITB's and aplha-n mappings are great for N.A, but does it or can it actually make a marked improvement for boost applications? |
In cases of TC/SC with ITB, you will have to go map way. I am guessing it should be okay ( still wondering why you would want a boosted ITB ) as pressure pulses would be dampened due to common intake chamber....
Mapping with ITB, Alpha-N and TC/SC will be difficult (never precise) ,but should be able to get away with atleast for WOT..
Quote:
| Nope. No digital ignition/DDLi for the Fords. Camshaft run delco at right end of valve cover. Which was why I wondered about the alteration specifics. |
i'm not sure abt this, but i vaguely remember playing with ignition on a 1.6 zetec escort (or was it astra??).. it was a 3 wire twin coil wasted spark system...let me chk on this..... most fords have DDI though....
Quote:
Great stuff so far....things are getting much clearer...especially for learners like me....
|
We are all learning too
.........