Converted to Extra, now it doesn't work

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ANTI VENOM
MS/Extra Newbie
Posts: 23
Joined: Mon Jun 30, 2014 2:49 am
Location: Spokane, WA

Converted to Extra, now it doesn't work

Post by ANTI VENOM »

Hello everyone.
MSII V3.0 msextra 3.3.2
383 LT1 SBC with small cap HEI 8pin module. Nothin fancy, just a SBC.

I originally built this with the MS code and I had 2.90500 on it. IT HAS NOT RUN ON A CAR. The simulator always seemed to work fine and I tinkered with it occasionally. Now that I'm ready to install the MS I decided to "upgrade" to the latest extra code, which I did. I also changed the associated wiring and components.

I think it is basically working but I noticed something smelled hot. My burnt finger told me it was Q6. D16 comes on dim but doesn't do anything else. D14 and D15 don't light at all. I have done some tests to see if there is a short via the suggestions on the forum and it all checks out. Do you have any suggestions for me? Just for the record, I have an "old" stimulator. Pre 2008 for sure.
D1 and D2 are not installed
Q16, R43 and D8 are installed, don't know if I need them.
Cut the jumper from S12C to JS9?
I followed the instructions from the HEI section to the best of my ability.
91 Vette 383 LT1 with HEI distributor
MS2 V3 with Extra 3.3.2

Turbo coming after it's tuned!
7/21/2015 first start
Matt Cramer
Super MS/Extra'er
Posts: 17507
Joined: Thu Apr 16, 2009 8:08 pm

Re: Converted to Extra, now it doesn't work

Post by Matt Cramer »

Is it set up for HEI using the MS2/Extra manual or the B&G directions?
Matt Cramer -1966 Dodge Dart slant six running on MS3X
ANTI VENOM
MS/Extra Newbie
Posts: 23
Joined: Mon Jun 30, 2014 2:49 am
Location: Spokane, WA

Re: Converted to Extra, now it doesn't work

Post by ANTI VENOM »

91 Vette 383 LT1 with HEI distributor
MS2 V3 with Extra 3.3.2

Turbo coming after it's tuned!
7/21/2015 first start
Matt Cramer
Super MS/Extra'er
Posts: 17507
Joined: Thu Apr 16, 2009 8:08 pm

Re: Converted to Extra, now it doesn't work

Post by Matt Cramer »

Can it get RPM on a Stim?
Matt Cramer -1966 Dodge Dart slant six running on MS3X
ANTI VENOM
MS/Extra Newbie
Posts: 23
Joined: Mon Jun 30, 2014 2:49 am
Location: Spokane, WA

Re: Converted to Extra, now it doesn't work

Post by ANTI VENOM »

Yes, I can get RPM while using the Stim. I wasn't able to at first, but after changing some setting in the ignition set up it seems to be working, I just don't know why the transistor is getting so hot.
91 Vette 383 LT1 with HEI distributor
MS2 V3 with Extra 3.3.2

Turbo coming after it's tuned!
7/21/2015 first start
Matt Cramer
Super MS/Extra'er
Posts: 17507
Joined: Thu Apr 16, 2009 8:08 pm

Re: Converted to Extra, now it doesn't work

Post by Matt Cramer »

What exactly do you have wired to the D14 circuit? It sounds like you're running too much current through Q6 - wrong pull up resistor value, perhaps?
Matt Cramer -1966 Dodge Dart slant six running on MS3X
ANTI VENOM
MS/Extra Newbie
Posts: 23
Joined: Mon Jun 30, 2014 2:49 am
Location: Spokane, WA

Re: Converted to Extra, now it doesn't work

Post by ANTI VENOM »

I've checked and double checked. It's wired just like the V3.0 in this link. http://www.msextra.com/doc/ms2extra/MS2-Extra_HEI.htm
R24=330 Ohm
R26=1k
Vcc through a 1K ohm then to pin 3 (Collector) of Q6
Collector of Q6 is also wired to IGN (I don't know where that goes) UPDATE. IGN goes to pin 36. Pin 36 on my Stim is +12VDC by way of a wire jumper
Once again Stim is older than Extra. Does that matter? It worked perfect on the MS code and wiring.

Maybe I need a Stim schematic!!!! :x Found it here: http://www.megamanual.com/v22manual/v1stim.htm Pin 36 is not shown on the schematic and it doesn't make sense for it to be wired to +12VDC. I was given this Stim a long time ago, didn't have a problem before coz I wasn't tying IGN to Q6 until the Extra update.
Thanks for the help so far Matt. I'll try this sucker out later and let you know how it goes.
91 Vette 383 LT1 with HEI distributor
MS2 V3 with Extra 3.3.2

Turbo coming after it's tuned!
7/21/2015 first start
jsmcortina
Site Admin
Posts: 39617
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: Converted to Extra, now it doesn't work

Post by jsmcortina »

ANTI VENOM wrote: Pin 36 on my Stim is +12VDC by way of a wire jumper[/u][/b]
Can you cut the jumper?

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
ANTI VENOM
MS/Extra Newbie
Posts: 23
Joined: Mon Jun 30, 2014 2:49 am
Location: Spokane, WA

Re: Converted to Extra, now it doesn't work

Post by ANTI VENOM »

I cut the jumper and it solved the heating transistor. Now that I understand the circuit it makes sense.

Next on the list is: JS9 to S12C. I cut it coz I wasn't finding any info on it. I keep reading and reading and reading, a I find a section called the conversion manual. Bad part is that I saw the link to it in the Tuning Manual page. Why would I look ahead to tuning if I can't even get my MS to work? I believe that JS9 to S12C is power for the IAC. I'm not sure because I've not seen a schematic for the MS board and the information seems to be very scattered. I really appreciate the amount of effort that most go into something like this, but I can also say that the "EXTRA" stuff is confusing to say the least. When I originally built my MSII it seemed very straight forward. Just follow the manual and it worked. Now I'm just struggling and wish I would have stayed with MS code.
91 Vette 383 LT1 with HEI distributor
MS2 V3 with Extra 3.3.2

Turbo coming after it's tuned!
7/21/2015 first start
jsmcortina
Site Admin
Posts: 39617
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: Converted to Extra, now it doesn't work

Post by jsmcortina »

The S12C-JS9 jumper should normally be installed with MS2 yes.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
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