Injection Info Needed
#1652053
07/28/14 01:38 PM
07/28/14 01:38 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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For the injection guys... I getting ready to run the wiring harness through the firewall and was wondering if the harness passes by the 7al ignition box will this cause any RF issues .. I have the 7al box in the glove box and was planning to put the the injection computer/box in there also... it might be 5" away.. I'm running out of room thanks for any help 
Last edited by MR_P_BODY; 07/28/14 01:51 PM.
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Re: Injection Info Needed
[Re: MR_P_BODY]
#1652054
07/28/14 03:58 PM
07/28/14 03:58 PM
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
MRMOPAR622
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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Mr_P while this may or may not help you,I had a problem with my dist. arching fire to the Tunnel-Ram intake on one of my engines and put a very thin piece of lexan between them and solved the problem.I know it was not suppose to arc fire from the dist. to the intake but it did! Do you think maybe if you put 1/4" piece of lexan in between them it would keep you from a having a problem? PS that is the best idea that I can come up with! 
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: Injection Info Needed
[Re: dogdays]
#1652056
07/28/14 05:06 PM
07/28/14 05:06 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I have an RFI scanner because of a medical device I have, and I checked my MSD6. It did have significant fields about one foot and closer, too strong for my device.
I think you have asked a very intelligent question.
Lexan does not, AFAIK, have any RF shielding qualities.
One solution might be shielding with a conductive box or partition. Thin sheet steel would be where I'd start. It has to be grounded.
R.
After sitting on the phone waiting for the Holey tech
I finally got him.. I wasnt sure of a couple of wires
which he set me straight on and the RF stuff.. he
said if the box is mounted 4" or 5" away from the MSD
it would be ok and I asked about the main harness
passing by the dist and he said if its a few inches
away or more then that shouldnt be a problem... I
might rap it with some high temp alum tape and ground
that to help
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Re: Injection Info Needed
[Re: MRMOPAR622]
#1652058
07/28/14 06:24 PM
07/28/14 06:24 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
I have an RFI scanner because of a medical device I have, and I checked my MSD6. It did have significant fields about one foot and closer, too strong for my device.
I think you have asked a very intelligent question.
Lexan does not, AFAIK, have any RF shielding qualities.
One solution might be shielding with a conductive box or partition. Thin sheet steel would be where I'd start. It has to be grounded.
R.
I have a Question to ask?I understand by using a thin sheet steel and grounding it to chassis it will attract the RF to it.But by grounding it to the chassis what will keep it from causing interference with all the other electronics/electricals that are grounded to the chassis? Dumb question yes,but unless I ask I will never understand/know. At least by asking if I ever have that problem in the future I will know how to fix it.
My understanding is when you dump it to ground you
are dispersing it over a larger area(making it weaker
at any one area that can effect anything)
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Re: Injection Info Needed
[Re: MR_P_BODY]
#1652059
07/28/14 07:47 PM
07/28/14 07:47 PM
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Joined: Feb 2011
Posts: 159
australia
charger410
member
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member
Joined: Feb 2011
Posts: 159
australia
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Mounting them both in the glove box is no problem, but it would be best to keep the wires separate from both units or shielded as you suggested. And don't rely on the glove box hing to earth the cases run a small gauge wire to the dash or body as added insurance. The main switching noise coming out of the Msd will be on the main power wire which is why it's suggested to route it directly to the battery. Hope this makes sense 
Peter. Australian Charger, alloy block injected 410in, w9 na 9.03@148 leafs 3000lb
1967 barracuda 605 hemi Stage5 millennium 8.2@170
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Re: Injection Info Needed
[Re: go green]
#1652062
07/28/14 11:03 PM
07/28/14 11:03 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I try and wire my "information in " stuff( crank trigger , cam sensor , MAP , IAT ) away from plug wires and energy sending components . everything else does not matter because the ECU does not make decisions on anything else .
Thats pretty much the way those are done in the harness
but they are together in the main harness
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Re: Injection Info Needed
[Re: MRMOPAR622]
#1652063
07/29/14 11:50 AM
07/29/14 11:50 AM
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Joined: Nov 2003
Posts: 2,131
New Lenox IL
cudadon
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,131
New Lenox IL
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Quote:
Quote:
I have an RFI scanner because of a medical device I have, and I checked my MSD6. It did have significant fields about one foot and closer, too strong for my device.
I think you have asked a very intelligent question.
Lexan does not, AFAIK, have any RF shielding qualities.
One solution might be shielding with a conductive box or partition. Thin sheet steel would be where I'd start. It has to be grounded.
R.
I have a Question to ask?I understand by using a thin sheet steel and grounding it to chassis it will attract the RF to it.But by grounding it to the chassis what will keep it from causing interference with all the other electronics/electricals that are grounded to the chassis? Dumb question yes,but unless I ask I will never understand/know. At least by asking if I ever have that problem in the future I will know how to fix it.
With rf sensitive devices they should have their own power and gnd from the battery.
Then they are on their own circuit and noise from fans, pump, etc that gnd to the chassis won't affect the sensitive devices.
Don
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Re: Injection Info Needed
[Re: cudadon]
#1652064
07/29/14 11:59 AM
07/29/14 11:59 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
I have an RFI scanner because of a medical device I have, and I checked my MSD6. It did have significant fields about one foot and closer, too strong for my device.
I think you have asked a very intelligent question.
Lexan does not, AFAIK, have any RF shielding qualities.
One solution might be shielding with a conductive box or partition. Thin sheet steel would be where I'd start. It has to be grounded.
R.
I have a Question to ask?I understand by using a thin sheet steel and grounding it to chassis it will attract the RF to it.But by grounding it to the chassis what will keep it from causing interference with all the other electronics/electricals that are grounded to the chassis? Dumb question yes,but unless I ask I will never understand/know. At least by asking if I ever have that problem in the future I will know how to fix it.
With rf sensitive devices they should have their own power and gnd from the battery.
Then they are on their own circuit and noise from fans, pump, etc that gnd to the chassis won't affect the sensitive devices.
Don
Thats part of the reason they say you have to run the
large power and ground to the battery.. plus a battery
is a filter to smooth out spikes
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Re: Injection Info Needed
[Re: Mopar_Rich]
#1652066
07/29/14 04:00 PM
07/29/14 04:00 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
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Master
Joined: Jun 2003
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Romeo MI
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Quote:
FWIW: MSD does sell a noise filter which is really just a huge capacitor that should be installed right at the MSD box.
I was amazed when I took out my scope and started to look for RF and EMI noise around older style MSD ignitions on our dyno. They are very noisy systems, but "back in the day" that really didn't matter. Their newer digital systems are much better but they also offer features that and EFI ECUs usually doesn't need.
I'll try it as is and see what happens then if needed
I might have to get the filter... I'm trying to keep
things as far apart as possible but this little cab
keeps getting smaller.. damn near no room at all
under the dash
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