Can somebody please point me in the right direction. I want to start editing my open loop settings on an Evo 9 and I need to know what each of the following do:

1. Open Loop Load #1
2. Open Loop Load #2
3. Open Loop Throttle Low Load
4. Open Loop Throttle High Load

I did some searching but have been coming up with information for the Evo 8. Specifically I don't know the difference between the Low and High Loads for the throttle. I *think* but need confirmation that the Load #1 and #2 are the Open Loop settings for an engine warming up and one that is up to operating temperature.

thanks,
danl

 

bump. I am curious about this also

 

bump (for VIII)

 

bump

 

Its the load and TPS voltage that determines when the ECU drops into open loop from closed loop.. Low load is (I think) cruise without heavy load on the engine, high load I think is when the accessories (A/C, Electrical load, etc) are running.

 

1 and 2 were the same on mine, so I moved them together.

I increased the load threshold by about 5 at typical cruise RPM.

 

so obviously open throttle 1 and 2 or the open->closed loop crossover points based on TPS...

but I don't get what open load 1 and 2 do?

cheers
Dave

 

The load ones will change closed/open loop based on load.

Makes sense if you end up building a lot of boost on part throttle you don't want to be stuck in closed loop.

 

as a quick primer,
raise the load threshold to drop out of closed loop when you experience part throttle boost?

 

If you want to drop out of closed loop control at a higher ECU load..

Generally the TPS Crossover is about 30-40% throttle.. There are conditions where you will get into boost at very low throttle inputs, that is what the load is for.. It allows the ECU to detect that and drop into open loop should loads exceed what its expecting based on TPS.

 

alright im still a bit confused

in my open lopo throttle, the values for 500-3500 rpm are 96.2%, does this mean we need to be at almost WOT to get into open loop? at those RPM??

seems a big extreme

also is it if either of those conditions (load or tps) are satisfied it goes into open loop?

cheers
d.

 

It is incorrectly scaled, about 60% for the lower RPM areas, 35% further up

OR

if the load is higher than the load threshold.

 

Its actually the load as seen by the ECULoad value.. Not TPS%

when your engine is idling, when your engine is under vacuum, its load is somewhere from 0 to 100, when your in boost its over 100-260

This ROUGHLY equates to Bar, as 1 bar is 0psi (14.7psi absolute from a vacuum)

This is where things get tricky when you deal with the stock ECU. Things that foul with your MAF sensor actually can affect things because it reads lower or higher loads.

There are two factors that determine when the ECU Crosses into open loop from closed loop feedback. Throttle position (as measured by volts, but if I were to assign a % to the TPS value it would be roughly 35%) or engine load, figure once the car is no longer in vacuum and over a few psi of boost, the engine will drop into open loop regardless of your TPS.

This is by design, and works as expected.

 

Hrmm my scaling must be out, when I just use int8 to see the real values I have:

500:154
1000:154
1500:154
2000:154
2500:154
3000:154
3500:154
4000:128
4500:92
5000:93
5500:93
6000:91
6500:89
7000:89
7500:87

How can I work out to right scaling for this? is it out of 255? where 255 = 4volts?

Any way someone can post up their's?

Cheers
David

 

255=5 volts.

Try 100/255 for %.