Im fitting an evo8 ecu to my '96 cm5a gsr fitted with the standard 1.8 liter 4g93t engine.

As the engine has a different size bore, the knock frequency will be different to that of the 4g63t.

What do I need to alter for the ecu knock input to work correctly on this engine?

Cheers

 

voltage!

 

I have had a look at 4G94 all values are hex (0x)

Knock Single Gain = 3
Knock Triple Gain = 5

Knock Multiplier = 10

Knock Load vs RPM
RPM 80 100 180 200 280 300 380 400 480 500
Load FF FF FF 78 78 78 78 78 78 78

Hope it helps.

 

Voltage??

Thanks, but im looking for the frequency settings as these will be different on the 4g93t.

Is this done in software? or is it part of the ecu hardware and cannot be altered?

http://autospeed.com/cms/title_DIY-D...8/article.html

Detonation resonant frequency = 900/ (3.14 x cylinder radius)

 

Like the name, seems to refer to a band I listened to

Detonation resonant frequency = 900/ (3.14 x cylinder radius) Radius is in METRES so the math is:

900 / 3.14 * 0.0405 or 7077 hz for an 81mm bore

900 / 3.14 * 0.0425 or 6741 hz for an 85mm bore

I can break out my hz at various orders from WAY back, but 336hz isnt even a note change at that hz level I dont recall. Mitsu's way of doing knock control has been likened to something like this:

Ideal-

A sharpshooter at 1 mile hits a target (i.e. 6741hz)

Mitsu-

A team of rednecks with automatic weaponry and grenades throws all its grenades and then shoots the smoldering crater (everything from 6500-7500 hz).

Voltage tends to be worthless when you get a built motor and larger turbo:



Look at the knock V

For reference the bore change on my build is

900 / 3.14 * 0.0435 which is 6733 hz or less than 8 hz difference. My knock sensor was good before the build, still reads so I have no reason to disbelieve it.