GM maff translator and rain any problems??

[92 GSR-4]

If you are using a DSMLink, you can lock out any temperature inputs and the ECU only sees a fixed temperature.

Yes thats true, but if water hits the GM MAF, it will report massive airflow. DSM link cannot overcome this unless you switch over to a simulated airflow signal, which will disregard the MAF signal altogether.

 

[90blacktsiawd]

In general i have no problems in the rain with my gm mas in the uicp. Even when i had my filter in the stock sidemount location i only had problems when it was utterly pouring out. I have since taken that off since it is my DD. But it only happened twice. The second time i had to pull off my fmic and drain the water out though.

 

[WNNAFLY]

I hate it too, and even though it may use intake air temperature in its calculations, it DOES NOT have a fluxuating intake air temperature output to the ecu, which effects the maps the ecu uses. The weather effects my car like crazy, and tuning is INSANE. Don't be surprised when I go to a full map sensor set up, or hack an aem intake air sensor into the wiring harness on my maft. I can't take it anymore.

I agree 100% as I have the same problems. A couple of weeks ago I was out tuning on a cooler night (Slight rain) and the next day I went to the dyno (its now warmer no rain)....what do you know my perfect 12.0 AFR was now all over the place and the car ran like crap. It was down to a 10 AFR in some areas....nothing but weather changed.

I thought about adding a GM temp sensor into my intercooler piping and see if that would fix the problems. Anyone else try this?

 

[92 GSR-4]

Hey this reminds me. Sorry I cannot comment on the IAT bc I am not having that problem, but if anyone is questioning whether or not water is getting into your air intake and causing the GM maf to go crazy (report massive airflow), do what I did. I was having wierd issues with fuel cut at lower boost (15-20 PSI) during rainy weather so I decided to log airflow SIGNAL and WBO2, and IDC using dsmlink. What I found was that my airflow was normal until around 12-15PSI and then suddenly a huge spike in airflow signal, IDC, and of course O2...causing my engine to break up really bad due to the rich conditions. So that did it for me, I put my splash shields in again, and haven't had a problem since.

 

[90blacktsiawd]

I thought about adding a GM temp sensor into my intercooler piping and see if that would fix the problems. Anyone else try this?

I'm not sure that an IAT sensor would help you much. Your still going to have to make your own changes with the tune. You may want to make sure your logger can be set to accept the input from it too. I'd be a big waste of time if you couldn't even read the signal.

 

[slipstream808]

Yes thats true, but if water hits the GM MAF, it will report massive airflow. DSM link cannot overcome this unless you switch over to a simulated airflow signal, which will disregard the MAF signal altogether.

Actually that might not even work.

The ECU goes off of simulated data at your set cutoff value. But the ECU is still getting airflow data. What this means is if the MAF can never give the right airflow data, then the ECU will never switch to the simulated settings. That or it jumps off it and off of it due to the erratic signals its getting from the MAF.

 

[92 GSR-4]

Actually that might not even work.

The ECU goes off of simulated data at your set cutoff value. But the ECU is still getting airflow data. What this means is if the MAF can never give the right airflow data, then the ECU will never switch to the simulated settings. That or it jumps off it and off of it due to the erratic signals its getting from the MAF.

yes your right about that. I was just using it as an example that the only way to overcome the sensor malfunction is to somehow implement a simulated signal....or stop water from getting in