MSefi.com read only forum (Jan.15,2018)

I think we have finally zeroed in on what is causing the hard rev limit, it is in the base ignition settings and is called tach signal masking. This was set at 50% and when I changed it to 20% the tach would go to 11,000 RPM vs the 6,000 limit I was experiencing before. If I set the masking to 10 ...

I have not looked at the forum in awhile so this is a late reply. I actually have a fuel pressure gauge on the fuel rail so will give it a look one of these days when i get a chance to run it at high RPMs thanks for the tip, hope this works as it is driving me nuts

So as the negative number increases (from 0 to -40) is the computer adjusting the timing back or taking it to 0 advance? Next question is what would cause this and is there a setting in Metatune to correct this? Since this started happening after a couple of years of no problems and not changing ...

We will give that a try.

C30 was not installed, we also had jumpered both D1 and D2 already

In looking at the datalog again, I noticed that when you watch the trigger + or - it stays at 0 until it gets to 6k rpm at which point it drops sharply down to a large negative number, around -40. What does this this track? Is this ...

I will do and let you know

Thanks

What exactly does this mean? I have seen it go negative at high RPM from -1 to -90. What is this telling me about the timing compared to the table?

Thanks

Dennis

Matt

Here are the jumpers we installed when we built the MS based on the instructions for Hall effect sensors using an MSD
IGN to D14
IGBTIN to JS10 IGN
S12c to C30 (one side)
Tach Select to XG1

I see another set of instructions for Hall sensor, Optical sensor or points that show:
XG1 to XG2 ...

I will have to pull the box and verify the jumpers as it has been a couple of years since we built the MS. I will let you know once I verify those. And yes, the MSD white wire is also tied to this as the MSD is the conduit for the trigger. The techs at MSD, when I thought it was the MSD that was ...

I trigger the MS from the electronic ignition module (+ wire) to pin 24, this is an Accufire module that has worked well in the past. To make sure it was not the module I replaced it 3 times, twice with new ones and 1 from a running identical setup on another car. I think the next step will be to ...

Ken and Matt

This is an aircooled engine so the coolant temp is really the cyl head temp, which has no effect on anything after 160 degrees, basically it is used for WUE and thats all, so it applies for about 30 seconds. On E85, AFR can run from 7 to 8.4 for max power so at 7.9 it is right in the ...

Here is the file loaded in Megasquirt and the corresponding datalog file from a dyno run

Please take a look is see if I am missing something in this setup

The engine is a flat 4 porsche 1.9L running E85 so the AFR table looks rich compared to gas but runs at a comparative 12.5 AFR from 4k RPM up

The MSD is set at 7k and the MS rev limiter is disabled. I will post a msq and datalog from a dyno run later

Running MSII, V3.0 2.891, Car ran fine up to 7,000 RPM consistantly for many races until hitting the rev limiter, now engine hits a hard rev limit at 6k RPM and will not go past, will miss once around 5500 RPM before going to 6k. Using MSD 6AL, MSD coil and electronic module in distributor. Have ...