For thoes following my dry problems. My maf readings are getting beyond the max of 12,200hz, which I thought would be fine except that when they do I'm getting spikes down to 0 instead of staying at the max.

So what is the highest Hz you have logged?

 

When I had the MAF sensor on my 416 I logged a max freq of 11.9kHz N/A. KcJeffs stock motor with a 125 dry shot logged 10.95k Hz. I've got alot more ,ogs at home and can look for peak Hz later on.

 

I haven't had time to go over old logs yet. Any updates Vinny?

 

I pulled the nozzle back (farther away from the maf)and set my window switch real low (5500 rpms) for last saturdays race and the car loved it. It went 11.45with a 1.57 60'.That was the fastest it has gone, and was great except I was in an 11.50 class.

I didn't log the runs, because I don't like the distraction of having the laptop in the car during a race, but I'll log a run next test session.

I think what my problem is, is that my computer does that dropped signal thing, when the frequency gets too high. I wonder if other cars do that too
?

 

Vinny,
Is yours logging high with and with out the gadget pluged in..?
Dave

 

With and without the 'gadget'. If I exceed much past the high limit of the table which is 12,200Hz, then my computer freaks and calls it zero. I've found someone else that this happens to as well. I'm starting to think that the max Hz the factory computer can read is the limiting factor with MAF style nitrous either spray through the MAF style or with a MAF signal generator.

Basicly I'm looking for more people who have fast cars who use the MAF for dry enrichment to see their experience, because I can't make an assumption off of just 2 cars.

 

You need to search the PCM section. IIRC you change the parameter at the top of the Hz, it has a value the PCM wont except. Change the value then it doesnt go to zero then it continues up in SD mode. I think the FI guys defeated this issue long ago but I never really paid attention because MAF's are for girlie girls.


J/K

 

Thanks for the tip.
I searchd around in the FI section and found there is a "maf freq. high fail" feature. which is C0301 in efi live. It basicly disregards any value higher than that as bad data, and mine was set to 13,500 (factory). I know it goes higher than that while on spray.
Learn something new every day!
I haven't tried changing it yet, but that makes total sense. I'll post up after I try it, which may be a few days since rain is on the way.