VEMS Community Forum

VEMS => Configuration => Topic started by: Jamo on November 19, 2009, 05:53:14 PM

Title: Lambda Table Size 1.1.27 16x14 vs 1.1.62 8x8
Post by: Jamo on November 19, 2009, 05:53:14 PM
Just reviewing the various versions and came across the fact that the Lambda Table Size in 1.1.27 is 16x14  but in 1.1.62 8x8

I'm trying to find out why would the size have been reduced and what the benefits of reducing this table size would have been in the higher version?
Title: Re: Lambda Table Size 1.1.27 16x14 vs 1.1.62 8x8
Post by: GintsK on November 19, 2009, 07:21:01 PM
In older firmwares table bins was merged between all tables.
Now - independent for most tables. 16x14 - only for VE because it can be very lumpy on some n/a engines. Spark, boost - 12x12, and some others just 8x8.

What advantages you see from 16x14 lambda table?!

Gints


Title: Re: Lambda Table Size 1.1.27 16x14 vs 1.1.62 8x8
Post by: Jamo on November 19, 2009, 07:24:57 PM
The larger the table the better resolution you have over lambda control for a turbo car in certain rev ranges

I.E you can set it every per 500 rpm rather than every 1000 rpm
Title: Re: Lambda Table Size 1.1.27 16x14 vs 1.1.62 8x8
Post by: GintsK on November 19, 2009, 08:59:38 PM
Interesting!
Do you often need rapid Lambda changes in more than one area over all map?

It is more about rapid changes - lumpy Lambda table, not about resolution. Resolution stays same - between corner points of each square ECU does interpolation.

Only case when it is needed IMHO when parallel with ignition retard bloody rich is desired in some area.  But for one such area 8x8 should be enough anyway. It is possible to put axis anywhere. 

Have you another experience?