View unanswered posts | View active topics It is currently Sat Sep 23, 2017 8:39 am



Reply to topic  [ 16 posts ]  Go to page Previous  1, 2
MS-PNP fail on Mighty Car Mods 
Author Message
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14780
Location: Home sweet home!
Really weird that it fried a power trace while in load mode and cranking. Alternator wouldn't have excited at that point, so couldn't be a spike.

I've not seen inside those boxes, but I'm not surprised at your comments. The latest MS3-"pro" is full of flaws too, and they charge moonbeams for those. And the idiots lap them up...

As for flashing vs ignition, we've got you covered here, that's not a problem with a properly setup FreeEMS unit. And by properly setup, I mean the circuit topology.

+1 to specific boards spun for each PNP platform, take a look at what Dan is doing for the RB25DET in "fledgling designs".

I wonder what became of the PNP in the video. It must've ended up somewhere :-)

Fred.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Mon Oct 14, 2013 11:58 am
Profile WWW
LQFP144 - On Top Of The Game
User avatar

Joined: Sun Jul 18, 2010 2:35 pm
Posts: 299
I don't know if this was posted but is possible that they killed the MS1 PNP unit. IIRC you have to pull a certain fuse\relay on the 1.6l miata for the fuel pump and if you don't you backfeed power into the mspnp unit.

Either way the haltech is hundred times better than a ms1 unit and still better than the ms2.


Sun Nov 03, 2013 4:21 am
Profile
LQFP144 - On Top Of The Game
User avatar

Joined: Sun Jul 18, 2010 2:35 pm
Posts: 299
ivan141 wrote:
I wont pretend to be an expert on MS-PNP hardware.. it really is too hard to tell what goes where on those 4-layer boards and with the availability of proper schematics for the SMD board being what it is at the moment. All I could tell whas that it was a 5 or 12V trace going to a pretty big capacitor (that looked like it was added as an afterthought). BTW, he also made the mistake of not removing a fuse mentioned in the manual when flashing once, which should have fried his coil, but somehow seems to have gotten away without damage.

Personally I feel the design on these old MS1 based PNP's is a disgrace (considering they where sold commercially).
I see wire jumpers soldered all over the place, capacitors soldered in place as an afterthought.
Not sure if there is much that can be done about behaviour when flashing firmware, but I'd at the very least expect some
consideration for robustness to stupid monkey users (known in our line of business as average customers).
I like the idea of a baseboard with an expansion board for PNP use with OEM connectors very much, but how hard can it be
to come up with a baseboard design that doesnt need wire jumpers, or for that matter: with PCB fab costs being as low as
they are these days: why not build a batch of more specific baseboards?

in Terms of flashing the hardware yes there is that issue with coils is how they designed the outputs to the coils to work, causing them to go high while the ecu is on due to the output being held high which would kill coils\igintors.

I didn't have any issue with the jag and freeEMS board when I flashed firmware and left the coils all connected.


Sun Nov 03, 2013 4:25 am
Profile
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14780
Location: Home sweet home!
If that's true about death by plugging in a PNP board, then it's NOT a PNP board at all, it's a disgrace. Is this true??? :-/

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Sun Nov 03, 2013 8:51 am
Profile WWW
LQFP144 - On Top Of The Game
User avatar

Joined: Sun Jul 18, 2010 2:35 pm
Posts: 299
Fred wrote:
If that's true about death by plugging in a PNP board, then it's NOT a PNP board at all, it's a disgrace. Is this true??? :-/

Yes it is true
http://www.megasquirtpnp.com/gen1/model ... ection_Two

Under: Installing your MSPNP (READ THIS!!!!)
scroll down to there and you see where they have you remove a fuse 10 amp, very important!


Sun Nov 03, 2013 1:44 pm
Profile
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14780
Location: Home sweet home!
Wow! :-/ Can't blame the Ozzies for that, really. Not very PNP if it self destructs with a dead stock car IMO.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Sun Nov 03, 2013 4:52 pm
Profile WWW
Display posts from previous:  Sort by  
Reply to topic   [ 16 posts ]  Go to page Previous  1, 2

Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software for PTF. ColorizeIt.