94170015 here too

OFF TOPIC: Mfred, could you add your patched XML files to the Wiki? I would love to see what all your have done in other ROMs.

Back on topic:
You all are so amazing. Seriously, you all need to start your own automobile ECU company. I am sure Ford, Chrylser, and GM could sure use the help. HEHE

 

There is a thread on the Omni 4bar and I cross posted that post over to it. Sorry to make a mess out of it with cross posting, I'm just trying to get the speed density stuff going and getting the sensors working on the car is the first step.

I just need to figure out if I am going to pull the intake manifold to install the IAT or if I should just toss it in the UICP to make it easy on myself.

 

Anyone other than people with the supported MAT patch cannot even begin to try this yet right ? Ive been searching and cant find anything needed for the 94170015 rom.

Ive been looking for the MAT logging patch and Controlling your Closed Loop AFR both for 94170015. The closed loop afr is needed but it would probably be helpful.

 

If you want some help getting the sensor working i think i can help you.

 

Everything except the MAT patch is available to run SD on the 94170015. I'm going to try to get the MAT patch done this weekend if time permits.

 

has anybody had any idle fuel trim issues with using the
MAT sensor mounted in the IM ?????
we were running the MAT sensor and noted the idle would run about 1200 rpm
and the fuel trim low was at 12% positive
the IAT sensor readings from the ecu were at 40 deg C
and the car was in High Intake temp enrichment constantly while ideling
we disconnected the MAT and went back to the MAF everything was perfect again trims returned to normal,

 

That may be heatsoak of the sensor. When I convert to SD, I plan on leaving my IAT in the UICP to see if it relieves this effect.

 

what sensor is this, the Mitsu JDM one or the GM IAT?

 

I am not having any problems with MAT reading going into the IAT input (well I wasn't before I left for my vacation). Fuel trims at idle are fine. I heated up the MAT to 40C also. However, this was running SD and using the OEM JDM MAT. I would expect problems if runnng MAF based fuelling with the IAT in the inlet manifold as the volume and temperature measurements are in different places. If this was running SD, then I suspect the VE tables might need more tweakage or the MAT sensor needs more consideration (although the posts of the aftermarket MAT sensor's reactions seemed fast, perhaps it is not as well insulated from the inlet manifold wall as OEM?)

 

On flaky connection on vacation, keep losing the reply.

I had no problem with 40C MAT and idle trims running SD. I would expect problems if running MAF with MAT instead of IAT as the volume and temp sensors are in different places. I also run the OEM JDM sensor which perhaps might have different insulation from the inlet manifold wall temperature. If problems whilst running SD you may need to think about moving or insulating the MAT, or rechecking VE settings.

 

Yes my idle was between 1200 and 1500 rpm to start with, but did manage to get it to idle correctly after playing with the tables.

Can't say I noticed the fuel trim was that far out.

More tweaking of the tables needed mate.

I haven't managed to get it working 100% on my car yet, and I had to pull the injectors out today, as I sold them, so back on the maf so I can get the settings right for the new injectors and get some good logs, so I can sort out the correct calibrations for the tables.

 

The logs that would really help would be warm idling for a few minutes, free revving steadily to 1500,2000,3000 RPM until the STFT settles. Also you need to try to pinpoint the places in the logs where any odd behaviour occurs, it can either be rich or lean that can upset things.

Maybe I found it easy to tune because I'm used to tuning SD and designed the tables around what I felt was needed, but it would be very nice to see other people have successful, smooth operation that works well to drive and in logs.

 

It worked well on my car for the few days that I ran it. I'm back to MAF for now because I'm messing with some other things.

I'm less and less worried about high MAT temperatures messing things up. I've been looking as some logs from an Evo with an exposed element filter, and IATs are much higher than ambient air temperature even when cruising down the road. His IATs are 15 deg F warmer than ambient (60F) when cruising, and the difference is even larger when the car is stationary.

 

nice job!

 

gm IAT