Hondata

Hello! I noticed lately when making pulls that datalogging is shutting down at higher RPM's. I am running a resistor plug, and datalogging used to work just fine on the same ignition stuff as I'm running now. A buddy of mine mentioned putting some sort of filter that goes on the outside of the cable on, and says it filters out noise.

Any help, or ideas where to start looking for this issue?

You should check your cap and rotor first, as they may be wearing out are in need of replacement.

Will do - I'll hop in here in a couple weeks after some testing and update with what I found. Please don't lock for the time being.

Eye Heart Boost wrote:Will do - I'll hop in here in a couple weeks after some testing and update with what I found. Please don't lock for the time being.

Do you have the laptop plugged into the a transformer or cigarette lighter for power? If so, try running just laptop battery power and try it again.

crucian wrote:

Eye Heart Boost wrote:Will do - I'll hop in here in a couple weeks after some testing and update with what I found. Please don't lock for the time being.

Do you have the laptop plugged into the a transformer or cigarette lighter for power? If so, try running just laptop battery power and try it again.

i've got a problem with tuning, when my laptop is pluged-in with a DC/AC transformer in the cigarette lighter.
i think the S300 is very sensible with the ground and something is happening there. have to check it, or not, since i now hat two 9 cell batteries now instead of one 4 cell :D

best regards Lukas

There are two main causes: excessive ignition noise and poor harness grounds. Adding suppressive ferrites helps, but it is much better to fix the cause of the problem.

For ignition noise only use OEM spark plug wires. Anything else can cause a problem. Make sure the spark plug gap is not excessive, or the plugs fowled with carbon. Only use resistor plugs.

With grounds you need to remove and clean to bare metal the engine grounds. There is one strap on the transmission, the main harness ground on the thermostat housing and another ground on the valve cover. Make sure the valve cover ground goes to the stud running into the cylinder head rather than the valve cover itself, which is rubber isolated. Don't use ground kits. They just create ground loops.

The last problem is from power inverters with laptops. Some power inverters offset the ground, which then creates a ground loop through the laptop and USB to the ECU. This can also happen if the harness ground (thermostat) is bad.

We did all of that and still had a problem in several cars and other cars not OEM sparkplug or not. And then sometimes it depends on who's laptop Im using at the time or who's USB wire Im using. or sometimes if the Zeitronix is plugged into the other USB port. It's all just weird. I just unplug it and use battery power. I think it's worse on cars with the strong ignition systems OEM sparkplugs or not.