David MPS
25/07/2004, 00h04
Reprogrammation du PCM !!
I can confirm this! I work at a dealership service dept. and my service manager just received an email from OBDII engineer Larry Mooney saying that this update (B27.4) is now available!!
The file for the Mazdaspeed Protege is QOAP4C0.
Everyone-
Now that the Update is official, I can elaborate on what was done.
Here is a dyno comparison of the Stock PCM vs. the Prototype PCM I tested with the Update:
The Stock PCM is the RED Line and the Prototype PCM is the BLUE Line.
Please note:
1. I have the Injen CAI, Protosport 2.25" DP, and JIC Magic SUS 60mm Exhaust.
2. I'm running STOCK BOOST.
The car is in Closed Loop from 2500 to 3300 RPM, where it then goes into Open Loop until Redline.
As you can see, the Air/Fuel Ratios for the two are almost identical until 4900 RPM; meaning the Mazda Engineers only slightly changed the fuel map from 4900 RPM to Redline.
So, what about the major differences in the 3300-5100 RPM range? That is where we all feel the hesitation and bogging, right? Especially after the engine coolant temperature gets into the "heat soak" range.
Well, the Mazda Engineers adjusted the TIMING map (ADVANCED TIMING) in this RPM range quite a bit to achieve the nice smooth HP and TQ curves you see in BLUE.
That is the answer to everyones question of "What exactly did they do?"
Driving around town, the difference between the Stock and Prototype was Night and Day. You WILL definitely feel the power difference shown on the Dyno Sheet.
Now to all of you with increased boost levels: bring it down to 9 PSI MAX (including spikes) or you will get knock.
Cheers.
-Shawn
ET voilà !!!
I can confirm this! I work at a dealership service dept. and my service manager just received an email from OBDII engineer Larry Mooney saying that this update (B27.4) is now available!!
The file for the Mazdaspeed Protege is QOAP4C0.
Everyone-
Now that the Update is official, I can elaborate on what was done.
Here is a dyno comparison of the Stock PCM vs. the Prototype PCM I tested with the Update:
The Stock PCM is the RED Line and the Prototype PCM is the BLUE Line.
Please note:
1. I have the Injen CAI, Protosport 2.25" DP, and JIC Magic SUS 60mm Exhaust.
2. I'm running STOCK BOOST.
The car is in Closed Loop from 2500 to 3300 RPM, where it then goes into Open Loop until Redline.
As you can see, the Air/Fuel Ratios for the two are almost identical until 4900 RPM; meaning the Mazda Engineers only slightly changed the fuel map from 4900 RPM to Redline.
So, what about the major differences in the 3300-5100 RPM range? That is where we all feel the hesitation and bogging, right? Especially after the engine coolant temperature gets into the "heat soak" range.
Well, the Mazda Engineers adjusted the TIMING map (ADVANCED TIMING) in this RPM range quite a bit to achieve the nice smooth HP and TQ curves you see in BLUE.
That is the answer to everyones question of "What exactly did they do?"
Driving around town, the difference between the Stock and Prototype was Night and Day. You WILL definitely feel the power difference shown on the Dyno Sheet.
Now to all of you with increased boost levels: bring it down to 9 PSI MAX (including spikes) or you will get knock.
Cheers.
-Shawn
ET voilà !!!