Quote:
|
Originally Posted by chetanhanda speed density uses 3 things - vacum readings from MAP , RPM and AFR IPW is then looked up for values of x,y and z..
didnt understand where you got air density and MAP as 2 diff params...?
|
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?
Quote:
|
Originally Posted by chetanhanda wouldn't call Alpha-n as the advanced version for mapping.. |
Quote:
|
Originally Posted by rdkarthik Alpha-N is not an advanced version for mapping. Its just an alternative..... |
Ah. Ok. That clears a lot.
Quote:
|
Originally Posted by Ford Rocam Alpha-n As the name implies is alternative method for metering fuel by using...
|
Superb. Exact practical use explanation.
Quote:
|
Originally Posted by rdkarthik What errors are you talking about? Is it computed quantity of air in the system?
|
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?
Quote:
|
Originally Posted by chetanhanda Usage - [1]Only if the radical cam profile is causing pulses in the intake to such an extent that the MAP is unable to provide an accurate resolution due to fluctuations
[2] OR if I am using ITB ... getting MAP to work will be a tough one with 1 map sensor per runner |
Quote:
|
Originally Posted by rdkarthik 2. Alpha-N is prefered (actually a must) for individual throttle body and/or wild cam profile applications.
|
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?
Quote:
|
Originally Posted by rdkarthik i thought the escort had a distributorless setup...
|
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.
Quote:
|
Originally Posted by chetanhanda are u talking in context of valves which dont use springs ? something like used on ducatti .. desmodromic? they dont use springs coz they dont cause valve float...
(This is OT are u from the biker background ..becoz AFAIK we use stiffer valve springs if we are planning to rev higher than stock spec..)
|
No, I was talking about ordinary valves, not the desmosedici/desmodronic setup. But let's get into that after the mapping is a bit clearer. (LOL....I'm not from a biker background per se...I prefer cars as well...ever so slightly...)
Great stuff so far....things are getting much clearer...especially for learners like me....