problems DMI low mount alternator & msd crank trigger
#476649
09/22/09 03:15 PM
09/22/09 03:15 PM
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anyone ever have any interference with a DMI low mount alternator, east coast 1 wire alternator and a msd crank trigger with noise interference.
seems with the new 1 wire alternator and crank trigger , motor is breaking up after around 4500 rpms, when i switch to distributor pickup, no more breaking up.
can anyone help figure how to stop the noise interference.
i want to use the crank trigger . thanks
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Post deleted by Defbob
#476650
09/22/09 03:26 PM
09/22/09 03:26 PM
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Re: problems DMI low mount alternator & msd crank trigger
#476651
09/22/09 04:25 PM
09/22/09 04:25 PM
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Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
cudabin
super stock
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super stock
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Posts: 903
Saskatchewan, Canada
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The DMI stuff is anodized real nice, but that does not ground... does the trigger sensor need a ground?
Not sure if this helps, but i did have to run a seperate ground wire on my alternator due to the DMI bracket.
Cheers,
Arnie
67 Cuda 8.48@ 158.7 mph 1.18 60' 2,600 DA(so far...)
70 Super Bee 440 Six Pack 4-speed. 13.2 @ 104 Stock exhaust/Street tires.
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Re: problems DMI low mount alternator & msd crank trigger
[Re: RylisPro]
#476653
09/22/09 06:27 PM
09/22/09 06:27 PM
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Joined: May 2007
Posts: 446
oregon
savoyracer
mopar
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mopar
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oregon
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Quote:
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MSD 8275 is a 3/8" shielded pickup with a ground
http://www.msdignition.com/uploadedFiles/MSDIgnitioncom/Products/Distributors/8275_instructions.pdf
I know most guys have the 3/4" pickup and I will have to get that also
but I'm sure when it's grounded it would fix any probelms
the grounded black is just grounding the sheath cover to eliminate interference.
thread from MSD forum:
http://www.msdignition.com/forum/showthread.php?t=6790
...........Before spending the bucks on the MSD shielded wire, get some heavy tin foil from your grocery store [under $2.00]....wrap your crank trigger wire with it, and try it. I had the same problem, and that cured mine. And for the two bucks, versus the $180.00 that I was quoted for the shielded wire, the tin foil is now part of my racing operation. 
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Re: problems DMI low mount alternator & msd crank trigger
[Re: savoyracer]
#476654
09/22/09 07:04 PM
09/22/09 07:04 PM
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if you guys look at the msd 8275 showing a grounding wire with shrink wrap on it, where do you think the grounding part starts inside the shrink wrap or does it touch the metal part of the sensor?
i think this might help.also the aluminum foil inside the shrink wrap might also work, what do you think.
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Post deleted by Defbob
#476655
09/22/09 07:17 PM
09/22/09 07:17 PM
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Re: problems DMI low mount alternator & msd crank trigger
#476656
09/22/09 07:23 PM
09/22/09 07:23 PM
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just found out that the wire wraps around the purple and green wire and the heat shrink keeps it all in place, its a special grounding wire with a loop to ground to the head or motor, dont ground it to the chassis. 
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Post deleted by Defbob
#476657
09/22/09 07:32 PM
09/22/09 07:32 PM
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Re: problems DMI low mount alternator & msd crank trigger
[Re: B G Racing]
#476659
09/26/09 09:19 PM
09/26/09 09:19 PM
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just an update, i got the shielded wire from msd and attached it and grounded it to a dedicated isolated area with the crank trigger with the low mount alternator from east coat electric and the car was breaking up real bad, shooting ducks down the track, i switched back to the distributor pickup and the problem went away. so my question is could the sensor have gone bad, or do they just quit working. this crank sensor is brand new. or is the interference from the alternator still the problem? 
Last edited by SUPERSTOCKRACER; 09/26/09 09:19 PM.
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Re: problems DMI low mount alternator & msd crank trigger
#476660
09/26/09 09:25 PM
09/26/09 09:25 PM
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Joined: Jan 2003
Posts: 19,361
Las Vegas
Al_Alguire
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I Live Here
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Disconnect the alternator and make a pass..Or you can test the pick up to see if it is working properly.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: problems DMI low mount alternator & msd crank trigger
[Re: Al_Alguire]
#476661
09/26/09 09:29 PM
09/26/09 09:29 PM
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Quote:
Disconnect the alternator and make a pass..Or you can test the pick up to see if it is working properly.
is there anyway to fix this problem, i want to use the crank trigger with this low mount alternator and bracket.
do these sensors go bad and still keep the car running, car revs up nice in nuetral but under a load it runs like crapp.
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Re: problems DMI low mount alternator & msd crank trigger
#476662
09/26/09 09:32 PM
09/26/09 09:32 PM
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Joined: Jan 2003
Posts: 19,361
Las Vegas
Al_Alguire
I Live Here
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I Live Here
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I would guess you are getting interference from something. May or may not be the alternator, I have seen electric water pumps and fans cause all sorts of issues with crank triggers. Best thing to do is to isloate the crank trigger wires as much as you can.
To answer the question about the pickup being bad and the car running not liekly but I never say never. Is the wheel in good condition and the pickup wiring?
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: problems DMI low mount alternator & msd crank trigger
[Re: Al_Alguire]
#476663
09/26/09 10:18 PM
09/26/09 10:18 PM
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it could be as simple as the wires in the connector assembled wrong from the factory. i've seen about a half dozen other things that will cause similar problems. an old timer once told me, "you have to be smarter than what your working on sometimes". i think he was right. a simple process of elimination should find the cure in a matter of minutes.
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Re: problems DMI low mount alternator & msd crank trigger
#476664
09/26/09 10:19 PM
09/26/09 10:19 PM
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Joined: Jan 2003
Posts: 19,361
Las Vegas
Al_Alguire
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I Live Here
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Certainly seen the purple and green wires reversed a couple of times..
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: problems DMI low mount alternator & msd crank trigger
[Re: mac56]
#476666
09/27/09 08:16 AM
09/27/09 08:16 AM
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Quote:
I may not have read carefully enough but I don't see any where in your post that mentions phasing in your distributor when you go from the distributor pick up to the trigger. Also I believe msd does have a test procedure for the pick. I can't remember if it is in their tech or if I called them.
i ran the crank trigger for over a year with no roblems whatsoever with a stock race hemi alternator, switched to the low mount and the problems started, i phased in the distributor and then retimed the trigger.
somethings going on with the setup.
either bad sensor or the interference is still there depite the shielded wire.  im very 
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Re: problems DMI low mount alternator & msd crank trigger
#476667
09/27/09 08:44 AM
09/27/09 08:44 AM
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Joined: Mar 2006
Posts: 5,067
Orlando Florida
blown572dart
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master
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Quote:
I just ordered mine and will be watching this  .
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