Coil wire

I'm using the 8.5 MSD plug wires and the same coil wire.

Data logger is not liking the noise.

Is this the wrong coil wire ?

 

Sheilded and Earthed Datalogger Cables

It should be ok.

I hate to ask this since you might think I'm trying to teach you to suck eggs, but are all cables for the datalogger well earthed? Especially at the sensor end? ( Randy knows all about earthing sensitive cables, don't you Randy? ) There aren't any cables running too close to the spark plug or coil leads?

It's quite possibly just one faulty earth that's giving you grief.

Paul.

 

Thanks for the input. I like eggs

I'm going to double check everything this week !

 

are saying earth as in grounds??? I have been having some issues also..thanks guys..Dave
www.myspace.com/davelowe

 

The problem has always been there. We haven't run the boat much and now we aregetting some testing time. So the problem is never ending. One guy asked about the coil wire and stated that even on the fuel car ( 44 amp mags ) they had to use these wires BUT, they used a different coil wire that the ProStock guys used ?????

It seems fine until you put it on the water and even then is fine up to 3500 rpm, then the egt's go flat lined ??? The rest of the info is still gathered on the logger, just the egts are the problem ?

Thanks for your suggestions Mike, we all know your a big help to the racers here

 

Not sure if this will help....but when you talk about the egt problem, where they are ok at idle and then up to 3500 rpm's before they go flat line., we experienced that exact problem a few years ago with our racepak data logger. Turns out that grounding the heads took care of the problem instantly, and the egt's have worked flawlessly ever since. So maybe if the heads aren't grounded start out by trying that.

 

The egt's go into one junction box. I don't believe it is a metal box though ?

I'll check that tonight when I get home.

I don't have the heads grounded ! I have a battery ground to the block and then another smaller ground going to the opposite corner to a bell housing bolt. Maybe I do need to add grounds ??????

Again, Thank You for your suggestions !

 

hay mike my boxes are not grounded but heads are and i dont have a prob we run a RPM set up think i should ground them to

 

It appears to me that the box is plastic or maybe aluminum extrusion ? I'll have to pull it out and check further.

 

Fiberglass.

So I need to ground the heads together and then to the cast iron block ?

I have the negative cable from the battery to the block and then a # 10 ga wire from the battery to the block ( opposite corner of the battery cable) , the Mallory coil, negative is connected to this point also .

 

my boxes are cast aluminum and i have them zip tied to a frame member mike think i should ground them

 

I would.

EDB