custom OBD1/MUT scanner/boost controller - 3000GT/Stealth International Message Center
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Old 09-11-2010, 07:32 AM   #1 (permalink)
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Default custom OBD1/MUT scanner/boost controller

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 all year model 3/S cars (91-93 OBD1), (94-99 MUT). 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.

Video showing the config menu, and exploring a bit.







Last edited by BlackStealth; 09-11-2010 at 10:10 AM.
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Old 09-11-2010, 07:53 AM   #2 (permalink)
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Default Re: custom OBD1/MUT scanner/boost controller

Wow. Custom PCB?? This is awesome, squared.
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Old 09-11-2010, 08:59 AM   #3 (permalink)
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Default Re: custom OBD1/MUT scanner/boost controller

I'll take one
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Old 09-11-2010, 06:47 PM   #4 (permalink)
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Default Re: custom OBD1/MUT scanner/boost controller

Nice! where did you get your pcb made? A place like BatchPCB or did you have a whole run of these made?
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Old 09-11-2010, 06:49 PM   #5 (permalink)
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Default Re: custom OBD1/MUT scanner/boost controller

Very nice. I'm interested.

Can you just plug the hybrid datalogger into that (is it a pass through for the serial, or does it touch any of the serial data?)
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Old 09-11-2010, 08:00 PM   #6 (permalink)
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Default Re: custom OBD1/MUT scanner/boost controller

I had a batch of PCB made at Gold Phoenix, because I figured some people might want one too.

Sorry no serial pass through. It communicates to the ECU through the serial (diagnostic port). I was considering adding a flash SD Card to store datalog information, but I left it out.

If anyone wants one, send me a private message.
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Old 09-11-2010, 08:01 PM   #7 (permalink)
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Default Re: custom OBD1/MUT scanner/boost controller

Looks good

Last edited by 13diamonds; 09-11-2010 at 08:59 PM. Reason: I need to read more slowly
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Old 09-11-2010, 08:03 PM   #8 (permalink)
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Default Re: custom OBD1/MUT scanner/boost controller

By any chance did you base this off of the ATMega MUT project that was floating around a while back?

Regardless, it's pretty damned cool. I had a similar idea (minus the boost controller) but I haven't gotten around to implementing it yet. Yours gives me some motivation to get mine going
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Old 09-11-2010, 08:22 PM   #9 (permalink)
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Default Re: custom OBD1/MUT scanner/boost controller

Quote:
Originally Posted by Gatecrasher View Post
By any chance did you base this off of the ATMega MUT project that was floating around a while back?

Regardless, it's pretty damned cool. I had a similar idea (minus the boost controller) but I haven't gotten around to implementing it yet. Yours gives me some motivation to get mine going
Yeah I'm also curious what you are using and how you like it? ATMega? Pic? Other? I'm using the ATMega for my dual wb display and auto up/down window controller. Super easy to work with.
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Old 09-11-2010, 08:25 PM   #10 (permalink)
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Default Re: custom OBD1/MUT scanner/boost controller

Quote:
Originally Posted by BlackStealth View Post
I had a batch of PCB made at Gold Phoenix, because I figured some people might want one too.

Sorry no serial pass through. It communicates to the ECU through the serial (diagnostic port). I was considering adding a flash SD Card to store datalog information, but I left it out.

If anyone wants one, send me a private message.
I only asked because it said "serial datalogger" on the picture.
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