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Old 04-11-2020, 01:07 PM   #1
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Need help tuning the boxster

I've spent some time reading the code from my 986 Boxster 2.5l
I have found many tables / maps and now I need help understanding what I am looking at.
The ECU/DME used in the 2.5l boxster is a Bosch Motronic M5.2.2 it's surprisingly similar to the older OBD1 DME used in older Porsche and BMWs.



This is the fuel map, at least one of them. I've processed it a bit so it can be readable. I'm not 100% sure that it is a fuel map but I used formulas from older Bosch DMEs.
In the map we can see two spikes going into two different directions. Granted they're exaggerated. Can someone shine some light on why it's tuned like that?

Help me understand what I'm looking at. I got a lot more tables I can show off.

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Old 04-12-2020, 07:36 AM   #2
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What is the end goal of your analysis?
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Old 04-12-2020, 07:05 PM   #3
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So, I assume that is calculated load, AFR and RPM? Interesting.
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Old 04-13-2020, 03:16 PM   #4
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Super cool.

How many other maps have you found? Please find the immobilizer bit values!

I expect the odd roll in the map at ~4500 is tuning for the Variocam kicking in.

Keep it up, this is how all the BMW ECU's made their way to the light of day.
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Old 04-13-2020, 03:51 PM   #5
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Quote:
Originally Posted by MaxD View Post
Super cool.

How many other maps have you found? Please find the immobilizer bit values!

I expect the odd roll in the map at ~4500 is tuning for the Variocam kicking in.

Keep it up, this is how all the BMW ECU's made their way to the light of day.
It completely slipped past me that VarioCam can be the reason for the change of fuel.
I found a lot of maps already but I don't know what they can control.

So far the programmer I'm using can only read a portion of the memory from the ECU. I think that's by design on Bosch's end. This is where the immobilizer parts comes in. I've read two ECUs and both were identical in code. Swapping the ECUs, as we know, doesn't work. My theory is, I need a more intrusive way of reading the code to find a way to "unlock" the ECU. I can totally be wrong. The more of the maps I can figure out the closer I'll get.


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Originally Posted by Quadcammer View Post
What is the end goal of your analysis?
I want to tune my car. Sure it's a dangerous game, but I'll willing to play.
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Old 04-25-2020, 06:36 PM   #6
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I figured somethings out with tuning my boxster. Anyone interesting in knowing how to tune their 986v1?
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Old 04-25-2020, 07:52 PM   #7
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Quote:
Originally Posted by JakeSFHunter View Post
I figured somethings out with tuning my boxster. Anyone interesting in knowing how to tune their 986v1?
Yeah!

What'd you figure out?

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