MS3 knock sensor wiring question.
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MS3 knock sensor wiring question.
I'm setting up a 305 TBI with a MS3 and I'm planning to use ON/OFF knock control with a GM knock module as referenced in the instructions here.
http://www.msextra.com/doc/pdf/html/MS3 ... .4-39.html
I'm not understanding if I need to build a protective circuit as referenced on the next page?
http://www.msextra.com/doc/pdf/html/MS3 ... .4-40.html
Or if I need some other kind of protective circuit for use with the GM knock module or don't need a protective circuit at all?
http://www.msextra.com/doc/pdf/html/MS3 ... .4-39.html
I'm not understanding if I need to build a protective circuit as referenced on the next page?
http://www.msextra.com/doc/pdf/html/MS3 ... .4-40.html
Or if I need some other kind of protective circuit for use with the GM knock module or don't need a protective circuit at all?
Re: MS3 knock sensor wiring question.
I haven't done an analog setup but, I would say after reading you need the protective circuit. internal mode is only if you get the knock and add-on board.
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Re: MS3 knock sensor wiring question.
With MS3X, you should be able to run the signal into a switched input on the MS3X and have it work fine.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
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Re: MS3 knock sensor wiring question.
I actually found the answer on the megamanual website for the MS2.
http://www.megamanual.com/ms2/knock.htm
The signal output is going to come in at 8-10 volts from the GM module, so I need to build that circuit with a zener diode to bring it into the 0-5 volt spec for JS4 or JS5.
http://www.megamanual.com/ms2/knock.htm
The signal output is going to come in at 8-10 volts from the GM module, so I need to build that circuit with a zener diode to bring it into the 0-5 volt spec for JS4 or JS5.
Re: MS3 knock sensor wiring question.
GeorgePatches wrote:I actually found the answer on the megamanual website for the MS2.
http://www.megamanual.com/ms2/knock.htm
The signal output is going to come in at 8-10 volts from the GM module, so I need to build that circuit with a zener diode to bring it into the 0-5 volt spec for JS4 or JS5.
DO NOT USE THE MEGAMANUAL! It's obsolete and some of the info is actually wrong . Use the manuals linked at the top of the page.
Linfert Performance/321 Motorsports
SCCA 2019 SM National Champion Crew Chief
SCCA 2023 FP National Champion Tuner/electrical engineer
100s of MS systems built installed and tuned
Support the developers!
SCCA 2019 SM National Champion Crew Chief
SCCA 2023 FP National Champion Tuner/electrical engineer
100s of MS systems built installed and tuned
Support the developers!
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Re: MS3 knock sensor wiring question.
The MS3X digital inputs already have the clamping circuit installed.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
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Re: MS3 knock sensor wiring question.
I have a MS3 Base though. Is there a CPU input other than JS4 and JS5 I can use to accomplish this without a protective circuit?Matt Cramer wrote:The MS3X digital inputs already have the clamping circuit installed.
Well the manual at the top of the page it's not clear if I need a protective circuit, nor does it give me any details on how to configure the MS3 with the GM knock module (going high versus going low). This at least clarifies what I had questions about.prof315 wrote:GeorgePatches wrote:I actually found the answer on the megamanual website for the MS2.
http://www.megamanual.com/ms2/knock.htm
The signal output is going to come in at 8-10 volts from the GM module, so I need to build that circuit with a zener diode to bring it into the 0-5 volt spec for JS4 or JS5.
DO NOT USE THE MEGAMANUAL! It's obsolete and some of the info is actually wrong . Use the manuals linked at the top of the page.
Re: MS3 knock sensor wiring question.
The schematic on page 40 ( linked in your original post) is what you need. I 'm not sure what your confusion was.
Linfert Performance/321 Motorsports
SCCA 2019 SM National Champion Crew Chief
SCCA 2023 FP National Champion Tuner/electrical engineer
100s of MS systems built installed and tuned
Support the developers!
SCCA 2019 SM National Champion Crew Chief
SCCA 2023 FP National Champion Tuner/electrical engineer
100s of MS systems built installed and tuned
Support the developers!
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Re: MS3 knock sensor wiring question.
Did you ever complete wiring to your SPR3, and if so, did it work as you hoped it would?
1966 Ford Fairlane GTA, 428 EFI (Working on it); 1986 K5 Blazer, MS3 - 383 Stroker ...Jesus, Wife and Kids MUCH more important!