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my custom electronic boost controller / knock box

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antero

20+ Year Contributor
34
0
Mar 26, 2003
taylor, Michigan
I just want to share with you something I made that works on DSM / Stealths and looks pretty cool.

I built something to replace my scanmaster and greddy profec B spec II boost controller and to make it easy to see while driving. It shows the AFR of my wideband O2, boost pressure in PSI, and knocksum from the ECU. If I want to see other datalogging parameters in real time I simply turn a rotary knob to the right. If I want to change my boost settings I turn to the left. To make changes, I simply push down on the knob.

Works with OBD1 DSM/Stealths and MUT DSM/Stealths. My friend with his 94 RT/TT wanted one so I spent a few months analyzing the MUT protocol and made it work. It can view Knock, Timing, Fuel trims, etc. Basically anything OBD1 can datalog, MUT can view too.

Because it's two products in one, I can for the first time have this boost controller respond to knock. ie. Lower boost if engine knock is present.

Another thing that worries me if my tune may drift lean when weather changes drastically. It will monitor for knock, and AFR and if it gets too lean with a small amount of knock, it will warn flash the screen red to get my attention and show how much knock was present, the WBO2 AFR number, boost pressure PSI, and RPM. Armed with this four pieces of information I can adjust my tune if needed be.

Temperature can have an influence on boost, so I've made a table that will re-adjust the duty cycle in order to maintain a more consistent boost.

I lose about 2 psi at redline because of my stock catback, this is no longer a problem. At 4000, 4500, etc RPMS, I add more duty cycle to compensate. Now I get steady boost across.

Displays CEL codes in english, no need to have a chart with you.

Earlier video of it in action. I've changed the menus a bit since.
YouTube - MyLCDproject

Video showing the config menu, and exploring a bit.
YouTube - ConfigMenu.wmv


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AWESOME!!! now get a vendor status and start selling these.. LOL

which wideband do you use with this?
 
Very nice! Glad to see people still thinking outside the box and making new innovations for the DSMs.

The MUTII protocol used on 2G Turbos(97-99) is fairly simply.
Just send an Init Sequence, then it is Request/Reply just like the 1Gs, but at 15625 baud.

The OBD2 protocol is overly complex on purpose. Very slow, lots of overhead, and can't log Knock, Injector Duty, etc. Just plain sucks.

The 95-96 DSM Turbos have a Hybrid protocol available. Some call it MUT-Over-OBD2, uses OBD2 protocol, but can log Knock, Injector Duty, etc.

--------------------

Does the 94 RT/TT use MUTII like the 97-99 DSMs and Evo5-9s?

Some of 94-96 Mitsu used "Hybrid" MUT protocols.


Very cool project! :thumb:
 
OBD2 is slow and doesn't have knocksum. MUT is Mitsubishi's own diagnostic tool for communicating at a higher speed and can show the things we are interested in.

I'm using my old PLX M300 wideband O2, but any wideband o2 that has a linear voltage to AFR will work.

Yup, the 94 RT/TT uses MUT2. Thanks for the info Ceddy. I guess I should state it only supports 97-99, and not 95-96 models. I would need a 95/96 ECU to support MUT-over-OBD2 to make that an option.
 
Nice are u going to be making more of these I would be interested
 
Anyone who is truly interested should send me an email. I don't want to violate any forum rules and making this into an ad. Thanks.
 
After Ceddy brought my attention of MUToverOBD2 protocol on 95-96 DSM, I went ahead and researched this, purchased an ECU and got this protocol to work. I now can do MUToverOBD2, MUT, and OBD1 all from the same box. In short, every model supported. :)
 
Some updates with the new hardware design:

Audible buzzer to alert driver in case of knock threshold is exceeded or engine is overheating.
More colors for LCD display.
Can dim the screen for night time driving.
Datalogging is now possible and extends Hand Held Halo and Evoscan datalogging software with the ability to read Boost and WBO2 AFR directly from ECU request.
Supports 57.6k higher speed datalogging for both HHH and Evoscan.
External connector for connecting 3 bar GM pressure sensor, or 4 bar Greddy pressure sensor.
Larger microprocessor than previous version, supports more program space memory so I can add more features.
Uses an expansion card idea for providing future upgrades, ie, serial datalogger card, bluetooth serial datalogger, or SD memory card.
Supports my OBD1 datalogger cable, allows the microprocessor to enable the OBD1 datalogging cable after the engine has started to avoid seeing the "ABS light" on your dash.

Screen shot of HHH with boost and WBO2 AFR added in.

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Picture of new design with serial expansion card sitting on top.
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Fantastic work! Very impressive, and might I say thank you for innovating something like this. I sent you a message btw.
 
That is nasty. Better than having too many gauges. I would like my car to stay clean, mean, but still appear stock.

I am INTERESTED. Caps on purpose ;)
 
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