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|Author:||apalrd [ Fri Dec 30, 2016 10:59 pm ]|
|Post subject:||Table Sizes|
What are your opinions on the ideal size of major speed/load indexed engine tables (like VE, spark maps, etc.)?
I have used 17x17 tables, with variable axis points, for no particular reason. I have never felt a need for more points, but I do adjust the RPM breakpoints to match the shapes of the torque curve. I have also always shared RPM and load axis points for major tables, this hasn't been a problem yet.
What are your thoughts?
|Author:||mk e [ Sat Dec 31, 2016 7:22 am ]|
|Post subject:||Re: Table Sizes|
I think it depends a lot on the application.
You need enough rpm points to approximate the shape of the torque curve as a minimum, then points around cranking, idle cold/hot and off idle can be very helpful. So for a lawnmower 8 is plenty, but on an engine with hot cams that you want you drive on the street 16-32.
The number for load depends on the load sense method and range you need to cover. With MAF you can get by with 1 row, 8 is way plenty. With MAP 8-16 should do it but with a lot of boost up to 24 maybe. With TPS you need to approximate the flow curve at all the MAP values....16-32
That is for VE. Other tables like a target lambda if you use it can be much smaller.
Spark again depends a bit on the application. 8x8 will do, 16x16 (or 17x17) is probably plenty for most things unless you want every bit of fuel mileage, perfect idle/off-idle and every bit of power on a high-boosted application.
When I have the option I start small and add points as needed while tuning.
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