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Dec 24, 2006 | 05:04 PM

#16

3gturbo

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From: Charlotte

Quote:

Originally Posted by MalibuJack

The problem is by doubling the range, your reducing the resolution..

But its not that important at low loads, and the higher loads really only have to be numerically close, its not hard to figure out where it goes after that point.

Are you familiar with the 1g extended load and timing maps?

http://users.wpi.edu/~ktarry/dsmtech/dsmromedit.html

Mar 19, 2007 | 07:50 PM

#17

C6C6CH3vo

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From: sc

Quote:

Originally Posted by evo4mad

oh yeah I take for granted that people know bits and bytes

1byte = 8bits = 0->255 decimal

because load wants fractions of a decimal those 255 are broken into fractions. 5/8ths to be exact.
i.e each 1 decimal = 0.625 Load

Load = 0->159 3/8ths (159.375)

now we want to know a lot more LOAD than that. so we need 2 bytes.

2bytes = 16bits = 0->65536 at 5/8ths resolution, will give us LOAD as at 0->40960

which is plenty large enough for any Turbo vehicle

lol

Once I have released EvoScan 0.98 with easy Power graphing and Easy Alarms, I'll add a facility to patch Evo7/8 ROMS to output 2 byte LOAD.

With the 0.98 I noticed my logged load % is slightly lower than before (0.97), this actually corresponds closer to the correct timing map values. The 0.97 read about 10% too high.

I'm still uncertain as to which parameters the ECU is reading and the calculation - I'll have to read the thread conversations between JCSBanks, Bez, and Malibu but the reading hurts like strenuous exercise.

I do see however calculated load follow the same shape (shape of line only) of plotted data as the actual IPW, just can't figure where the MAFhz falls in.

I need to research those read's to find if the logged IPW ms is a reading taken by ECU or just a commanded value sent out to the injectors. IPW corresponds to boost closely