Low Z noise problems

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neverlift19
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Re: Low Z noise problems

Post by neverlift19 »

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

Post by Peter Florance »

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

Post by Peter Florance »

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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yellowlt1ta
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Re: Low Z noise problems

Post by yellowlt1ta »

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

Post by jsmcortina »

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

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yellowlt1ta
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Re: Low Z noise problems

Post by yellowlt1ta »

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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dontz125
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Re: Low Z noise problems

Post by dontz125 »

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

Post by Peter Florance »

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.
Peter Florance
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Co-Driver 1999 BMW E46 DSP car.
yellowlt1ta
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Re: Low Z noise problems

Post by yellowlt1ta »

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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yellowlt1ta
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Re: Low Z noise problems

Post by yellowlt1ta »

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

Post by Peter Florance »

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
Peter Florance
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Co-Driver 1999 BMW E46 DSP car.
yellowlt1ta
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Re: Low Z noise problems

Post by yellowlt1ta »

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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joeblack
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Re: Low Z noise problems

Post by joeblack »

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

Post by Peter Florance »

Don't lift. More important to get sensor ground to standards.
Peter Florance
PF Tuning
81 BMW Euro 528i ESP Car
60-2 Wheel LS2 Coils, Low Z Inj
Co-Driver 1999 BMW E46 DSP car.
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