I've been logging the 91-96 Jecs for stuff now, and getting down to the nitty gritty.

So, if I have a map that's got load columns starting 4, 8, 12 and my load is 8, which zone am I in?

What I'm getting at, is, is the load value on the map the centre of the zone or the endpoint? I have for now assumed that the map starts at load 0, and the first zone is (for instance) from 0 to 4, and that a load of 2 would be right in the middle of the zone.

But I'm not sure.

Paul

 

Also, I was wondering if Delta ECU uses the TPS to ignore lean lambda readings seen on coast down.

Paul

 

Paul YHM.

 

thanks john.

I was looking at load and airflow and saw the same as you dropping load despite rising airflow.

The load is definitely linked to TP, I think it goes something like this:

Load = MAFxTPxA/RPM Where A is some scaling factor. I checked the TP and you can alter the load by moving the TPS when removed from throttle body.

If load scale numbers dictate the start of the zone, where's the end of the last zone?

It's not too critical at the moment, as the changes I make on the map correspond to the differences in AFR I see when logging.

Oh and I also had a speed density system thought out, will try an extract my thoughts to paper.

Paul



[Edited by Pavlo - 4/16/2003 8:30:47 PM]

 

If you guys could sort out a speed density input for either pre 96 or post 99 ECU's I'd be your test dummy
Just about to spend £££££'s on an aftermarket job..........hurry !

 

Andy,

Mail me please with details.

Paul

 

Paul the last zone just continues with the last value and drops off the end. Thankfully for fuelling this is an air fuel ratio rather than an injector time so if the MAF to load table still has headroom it will continue that AFR, but the timing will not retard further AFAIK.

So my MAF scaling is squashed so that it won't reach maximum load until Vcc for the MAF sensor at least. So as long as that is the case there is always further to go. I am waiting for the 2.33 to do it properly as it is a PITA and takes ages to get right. Mark at EMS has worked out for his a squashed MAF scaling and then changed the load headings, so the area of the map that is accessed is the same, but all done through a lower load lookup value making more headroom. Then the only problem is boost, but a 4 bar map sensor (although only using 3 bar area) would squash 4 bar within 5 V to allow boost control etc. Will do this if I need to hold over 1.6 bar on the 2.33 to get my 400 lbft.

Drawing a block diagram for a DIY VPC is a 5 minute job, getting the soldering iron and microcontroller stuff out again is another matter. The commercial HKS VPC is no longer made and also required a customised EEPROM for each car. The scale of doing this DIY is easy to underestimate - with the EBC it was promising until I ran out of counters on the chip and wanted to make it RPM capable, just lost interest.