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Old 01-15-2009, 12:36 PM   #1
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Default MS2 on my 2002

I got it to run today after several attempts at the input circuit. Like I said in a previous post, I used an LM339 instead of TL082, which worked just the same. I'm using all the stock sensors (Crank, Cam, TPS, IAT, CLT, Knock) minus the MAF (GM 1 bar) and baro (also GM 1 bar). It started on the first try, and idled around 900rpm (I'm currently NOT using the PWM valve) and pretty lean at 16.5:1. I managed to copy all my settings from my MS1 (priming, cranking, afterstart, warmup, accel/decel, VE, IGN, AFR, etc) so it pretty much just worked. Too bad it stalled just after I parked after a trip around the block because the battery died or I would have started tuning right away. Aparrently the NAPA voltage regulator is either not wired correctly or is not working - I will have to check it out or use Jason's circuit.

All in all, a spledid day I must say!

Jim
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Old 01-15-2009, 03:24 PM   #2
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Sounds good. Now post every picture you have of your car. Your signature makes me drool.
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Old 01-17-2009, 10:08 AM   #3
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can you post up a list of everything you ordered from diy autotune and whereever else to get this to work?

I'm sorry, but I am about to attempt to make a ms2 for my 2000, and this would really help. thanx
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Old 01-17-2009, 02:14 PM   #4
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I'll write a detailed "howto" once everything is up and running normally.

Jim
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Old 01-19-2009, 06:16 PM   #5
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Hi Jim,

Glad to hear you got things running with MS2, looking forward to the guide.

Cheers
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Old 01-19-2009, 06:58 PM   #6
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I'm curious. What are you using for your 5 Hz GPS?
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Old 01-20-2009, 01:55 AM   #7
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The 5H GPS is an OEM-intended module that I bought real cheap (like $40) from a friend. I had to build the power supply circuit (3.3V) and serial ports (it has two USARTs so I had to use a MAX232N to bring the TTL level lines to RS232 levels).

Jim
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Old 01-20-2009, 06:35 AM   #8
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Great job Jim, look forward to pics and stuff, your original MSinstall ,(along with Aussie Driver) was my inspiration to go MS all those years ago!
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Old 02-02-2009, 04:54 AM   #9
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Quote:
Originally Posted by Reverant View Post
I'll write a detailed "howto" once everything is up and running
Any updates? The write-up idea sounds good, bva MSII sticky is something we could really use here. I am looking into upgrading to MSII on my 97 right now, and was thinking that If I did it, I would want to do a write-up on the upgrade from MSI to MSII for NA cars.
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Old 02-02-2009, 06:31 AM   #10
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I'm still trying to resolve the alternator issue. The NAPA regulator didn't work for me, neither did Jason's circuit. I'll build one using the microcontroller board I use for the battery light circuit (different than the one Jason suggested).

Jim
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Old 02-02-2009, 10:50 AM   #11
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That's strange. Jason's circuit should drop right in and work well. What problem are you having with it?
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Old 02-03-2009, 02:55 PM   #12
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It simply doesn't work. The output is not PWM, just a constant voltage level (IIRC 2.5V, the same as the TL431 ref voltage). Naturally, the output voltage sticks to 11.5V. I've gone through the built circuit a hundred times, to no result.

Jim
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Old 02-04-2009, 03:03 PM   #13
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I've just finished building this circuit as well. Is there a way to test this it?
Should a variable voltage on the input (say 10 to 14.5V) give a variable voltage on the output? How much should I measure?
The car is still in the UK, so I can only test it on the bench right now.
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