---===The Official MAFT-Pro Thread===---

[TurboBob]

watch the CF reading on the sensor monitor. And yes the PT tracking has limits to its range...

Bob

[Barefoot]

I resoldered the yellow wire to the Tach signal Pin 101.

It does the same thing as before, except Instead of jumping, it just stays at approx 100*+ at WOT.. what is going on?

[TurboBob]

did you cut the resistor inside the unit.

Can you send me a log?

the FI display is the incoming frequency (RPM/60), it should be reasonably steady.

The timing monitor measures the 'angle' between the signal on the white wire (CAS/Crank signal) and the yellow wire (Tach signal, happens when the plug fires.)

Bob

[Highboosted]

Originally Posted by KILURV8

Bob,

You know I have been having issues with timing monitor and they continue. I hooked up my yellow wire to my tach signal and now I am getting a FI in the 50s. No matter what I set my TM base to I can't get it close my my logger timing. My logger timing is around 21-23 at idle, and my timing base on my MAFT pro is around 12-14 and no matter what I do, I can't get it any higher than that. Any ideas?

Brandon

most loggers you have top subtract 10 degrees to get actual timing. What logger do you have?

[Barefoot]

Originally Posted by TurboBob

did you cut the resistor inside the unit.

Can you send me a log?

the FI display is the incoming frequency (RPM/60), it should be reasonably steady.

The timing monitor measures the 'angle' between the signal on the white wire (CAS/Crank signal) and the yellow wire (Tach signal, happens when the plug fires.)

Bob

Yes, I did disconnect the resistor.

Could it be that it is pulling timing so much it becomes a "negative" number.

I have not set Base yet. My car idles at around 12-15 degrees. It seems like as I get into the throttle the spark advance lowers to 1-3 degrees, then shoots up to 120-ish degrees, then will every now and then show a low number, say .5 degrees, then peak at 120-ish again.

If you want me to post up the log, I can get it from the laptop, but this is the only thing that seems to make sense. At least everything is more stable now (other than the 120 degree peaks) with the Tach wire.

[TurboBob]

the reference period is 120 degrees, so a negative number would show as 120, 119, 118......

I thought I had that covered in the software though....

what are your TM Base and TM correct settings? The Base is an additive correction (+/- 10) and the "Correct" is a time-domain correction (compensates for lag in the system.)

Bob

[m1915]

Originally Posted by TurboBob

watch the CF reading on the sensor monitor. And yes the PT tracking has limits to its range...

Bob

In reference to the range of the PT tracking.. it is wierd that it doesn't seem to have as much power as it should. Even with a limit of 25% either way, it seems like my tune has to be pretty close for it to really do it's job.. like within a few %. If the PT tracking has the ability to lean or richen by 15% or even 25%, why does it need to be so close for it to do its job?

[TurboBob]

the PT tracking adjusts slowly because the airflow thru the engine is very slow at idle (which causes a lot of lag in the wideband feedback.) every time you you leave idle, the correction resets. so when you return to idle it has to walk its way to the required correction percent.

Also, when you tip-in you want to be driving in a reasonable AFR without tracking so you get smooth driveability.

Bob

[Highboosted]

Originally Posted by m1915

In reference to the range of the PT tracking.. it is wierd that it doesn't seem to have as much power as it should. Even with a limit of 25% either way, it seems like my tune has to be pretty close for it to really do it's job.. like within a few %. If the PT tracking has the ability to lean or richen by 15% or even 25%, why does it need to be so close for it to do its job?

tracking is naturally slow, so it's best to be tuned before relying on it.

[Barefoot]

Originally Posted by TurboBob

the reference period is 120 degrees, so a negative number would show as 120, 119, 118......

I thought I had that covered in the software though....

what are your TM Base and TM correct settings? The Base is an additive correction (+/- 10) and the "Correct" is a time-domain correction (compensates for lag in the system.)

Bob

Ok, that makes perfect sense then. The base setting is still at 0, correct is 1.27, neither have been adjusted at all, I just wanted to check everything else was correct first. I will have to adjust TM correct first using TMO log, then get TM base to a correct value using a timing light. Or at least thats what I figure to be the best way to get correct timing.