Wide Open Throttle Solution

[chdesign]

OK thanks Keith thats the info I was looking for I'm nto boosted anymore I'm a full NA setup now boost just wasn't for me. I am in the process of hopefully trading my stock protege ECU with a MP3 owner that has a turbo on his so that he can having my milder timing and i can have his advanced timing.

 

[70]

Dang this thread just exploded over night...

And, hopefully, FM will find the way to make their #1 solution work...(that is the car like the 12:1 bit)

 

[spoolinmp3]

To add to that, it takes more than just WOT to go open loop. It's based upon the ECU's calculation of load. Below a certain RPM, you're almost always closed loop.

Is this a predetermined set of points?Forexapmle it always closed loop under 4000 rpm.
Or does the ecu randomly go into closed loop and is not predictable when it does so?

 

[MazdaT]

Is this a predetermined set of points?Forexapmle it always closed loop under 4000 rpm.
Or does the ecu randomly go into closed loop and is not predictable when it does so?

It uses load. To determine load the ecu looks at tps, mass air flow, and rpm. Picture a graph with mass air on the vertical axis and rpm on the horizontal axis and tps as a percentage. Lets say crusing on the highway you are seeing 2.0 volts from the mass air, and 3000rpm. Then at the same rpm with more air flow and throttle the car has a higher load. Well the car is changing in and out of closed loop based on load. The only way to fully know when it will change in and out of closed loop, is to map the data
it uses to determine load. I have been manually graphing load, using a dyno with load compensation (it is way to hard to try to do on the street). Plus with the dyno you can watch the air fuel ratio change on the graph and see the rpm, you then only have to monitor tps and mass air.

Jeff

 

[Keith@FP]

Exactly. It's predictable, just complex.

Jeff, can you tell me what the MAF is reading, normally aspirated, at a particular load? We only have our turbo car, and I want to confirm some calculations. Say, 5000 rpm WOT in third on the road.

Keith

 

[LinuxRacr]

That's what I'm talkin bout! Coast-to-coast teamwork!!

 

[MazdaT]

No problem. In 3rd gear at 4krpm I see about 3.42v, at 5krpm I see 3.62v and at 6krpm I see about 3.96v. What are the voltages you guys are seeing and at what boost?

Jeff

 

[Keith@FP]

I'll have to get out in the car again to check. I just wanted to see how much of the extra air the MAF was "seeing".

Keith