Low Z noise problems

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Re: Low Z noise problems

Postby neverlift19 » Fri May 31, 2013 1:59 pm

from what I was told on the last page no a 35volt cap will not work as the circuit is clamped to 36 volts. Although I got better reading with the 35 over the currently installed 50volt .. Personally going back to the 100uf
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Re: Low Z noise problems

Postby Peter Florance » Sat Jun 01, 2013 5:28 am

neverlift19 wrote:from what I was told on the last page no a 35volt cap will not work as the circuit is clamped to 36 volts. Although I got better reading with the 35 over the currently installed 50volt .. Personally going back to the 100uf

It should ok. It would not work in the injector output, but you are installing on 12v rail. Which only has a few volts of noise on it.
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Re: Low Z noise problems

Postby Peter Florance » Mon Jun 03, 2013 4:38 am

Also make sure you have enough ground wires from MegaSquirt to ground. In your setup, I'd run eight 20ga minimum.
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Re: Low Z noise problems

Postby yellowlt1ta » Tue Jun 11, 2013 5:24 pm

Peter Florance wrote:Also make sure you have enough ground wires from MegaSquirt to ground. In your setup, I'd run eight 20ga minimum.


peter can I put 8 wires on a single pin off the DB37 for ground?

also can you tell me if I did this modification correctly.
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Re: Low Z noise problems

Postby jsmcortina » Tue Jun 11, 2013 6:03 pm

Eight ground wires means use eight pins. One wire per pin.

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Re: Low Z noise problems

Postby yellowlt1ta » Tue Jun 11, 2013 6:21 pm

jsmcortina wrote:Eight ground wires means use eight pins. One wire per pin.

James


ok, can I use one of the pins for multiple sensor grounds?

and is the picture correct?
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Re: Low Z noise problems

Postby dontz125 » Wed Jun 12, 2013 5:41 am

There are 15 ground pins on the DB37 - #1-2, then 7-19. Pick any 8 from 7-19 for your system grounds, use #1 and/or 2 for your sensor return(s).
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Re: Low Z noise problems

Postby Peter Florance » Wed Jun 12, 2013 8:32 am

yellowlt1ta wrote:
jsmcortina wrote:Eight ground wires means use eight pins. One wire per pin.

James


ok, can I use one of the pins for multiple sensor grounds?

and is the picture correct?

Yes, one wire for all sensor grounds is good.
Capacitor photo looks fine.
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Re: Low Z noise problems

Postby yellowlt1ta » Sat Jun 15, 2013 1:11 pm

so on the stim the logs look good but when I add one injector it still gets lots of noise.

check it out.
injector test on stim.11.msl
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Re: Low Z noise problems

Postby yellowlt1ta » Mon Jun 17, 2013 5:09 pm

any ideas? Iv been thinking that I should some how take out the injector ground from the megasquirt.
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Re: Low Z noise problems

Postby Peter Florance » Mon Jun 17, 2013 5:48 pm

yellowlt1ta wrote:any ideas? Iv been thinking that I should some how take out the injector ground from the megasquirt.

usually the stim is a little noisier than the car, for me anyway
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Re: Low Z noise problems

Postby yellowlt1ta » Mon Jun 17, 2013 6:08 pm

well I have put a ms2 v3.57 on a turbo mustang and have tryed everything to clean all the noise up. and this is as close as I have gotten
1stboost.msl


Thing is that I try to clear the noise on my car but nothing works. everything is the same, except that I use low-z injectors.
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Re: Low Z noise problems

Postby joeblack » Sun Oct 18, 2015 5:39 pm

Just need some clarification,am I putting a 47uf 50v capacitor from the center leg of Q3 to the center leg of Q9 and are any of the two legs lifted off the board?
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Re: Low Z noise problems

Postby Peter Florance » Mon Oct 19, 2015 4:52 am

Don't lift. More important to get sensor ground to standards.
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