Yes im still trying to fine tune the stupid mat vs. temp table. Ive noticed for awhile now that the data being spit out by the ecm doesnt correspond to the correct cells on the table. yesterday i spent about 30 min trying to figure out how far off it really is using the data tracing feature. had to make drastic changes in the values so the engine would respond enough for me to notice. so the issue is, say the IAT temp indicates 20*C, ill go to the corresponding cell and adjust the value at 20*C, nothing. then ill move up the the next cell which is (iirc) 44*C, adjust that value, nothing. then the next cell 56*C, adjust that and engine responds right away. so from my tinkering ive found that the indicated temperature from the datastream is about a 30* difference from the table. this makes it difficult to fine tune since the difference is that great. would there be something wrong with the conversion in the ADX? either way i need to be able to adjust the value in the table that directly correcsponds to the indicated temperature from the datastream. and help will be appreciated!

 

What table, 8xxx address?

 

Here ya go. You wanna make sure you get your BLM's close to 128 before hand.

 

Your IAT sensor is relocated to the airbox right? IF so,then that table above is what you wanna use. Not sure why you are adjusting the stuff you are now,but you should just go by this table here that I posted.

 

https://www.thirdgen.org/forums/diy-...advantage.html

You are looking for MAT delta inverse table

 

@ 84Elky, not sure of the address. its the MAT temperature vs. MAT table, not the inverse table. i will check the address once im home, cant bring in any electronics into work.

@ninetyone, IAT is located in the intake elbow just before the TB. ive been thinking about relocating it to the pass side fender well just behind the filter to help avoid some of the heat coming off the header. this is on the mustang btw.


im currently using that table too. im talking about the temperature table though.

 

I don't think you need to worry about anything buy the MAT inverse table. What is it you are trying to accomplish?

 

since i live in a desert area the temperature difference is drastic, and i have to trek up 1500 ft to work everyday and at this elevation the temperature difference is another 20*F. BLMs will fluctuate 8-10 counts and since i use OL idle that changes from 16:1 to 14:1. Dominic Sorresso's modified temp table got it closer but there is still a noticable fluctuation. anywhere from 10*F- 55*F ambient there is negligable differences but above that it starts to become a problem. the inverse table works for creating a nice flow on the VE table so there isnt too big of a difference from one cell to the next. ive actually built a history table to help aid that part of the tuning. right now the temp difference is giving me fits.

 

There is a write up (or two) about the MAT table usage in the Tuning Guide book sticky.

RBob.

 

. IAT functions as normal. if i use the datatracing to adjust value in VE table, like idle for instance, ill change the cell the is highlighted. the cell that is highlighted(by the datatracing bubble) is the actual cell im adjusting, no descrepancy. for the MAT table the cell hightlighted by the datatracing bubble doesnt match up with the corresponding value in the next cell directly to the right. i have to guess and its usually about 2 cells higher up in the range. im going to try and get some pics, seems like no one understands what im asking LOL. i need to work on my engrish

 

alright heres a short video, i tried to explain it as best i could, the F-22's were flying around my house full afterburner. literally a million acres of airspace and they have to fly directly over my house, idiots. anyway, heres the video, hope i explained it well enough LOL. oh and on the way to work i was able to get the table a little closer, variations are about 5-6 BLM counts now, and idle fuel is alot better.

 

At least its warm there!
I'll trade you some jet noise for some snow

Check your XDF parameter, Address 87FD "MAT Compensation Counts Vs. MAT " is the table.
The "DA Association" tab, change this to explicit and specify the MAT item directly from the ADS file.
I'm thinking there is another parameter set in the ADX as the MAT temp that may not actually be transferring the right value back to the XDF.
Only other thing i could think of that may be causing it is the "Temp lookup" table in the ADX is off for some reason.

John

 

Thanks John,

i was thinking the same thing until i went out and looked at the engine cold temp and it was within a few degrees F of ambient temp. so the lookup table seems to be accurate. i think it may be something in the XDF skewing the actual temp value to a higher temp cell. so you could be on to something about it not sending the right value back to the XDF.

P.S. DA assoc is set to explicit for MAT

Thanks!!!

 

What is the X and Y axis set for?

 

The MAT value in the data stream is via ADC counts. It needs to be converted before it can be used for data tracing on a table. If this is being done the look up table may not be correct.

RBob.

 

34blazer,

I appreciate that you keep bringing this topic up because it does interest me particularly since I moved by MAT sensor from the airhorn to a spot behind the air filter but ahead of the airbridge(which BTW needs to be stiffened or it will collapse at WOT). Now the table in the $D0A mask is a
MAT Temp C v Compensation. The temps in the table go to 151 C which makes sense since the airhorn is attached to the motor. However, by moving the MAT to an IAT location, my thinking is the IAT will never "see" that 151 C temp since incoming air probably won't go above say 51-55C. And at speed, the IAT should be measuring close to ambient temp air. IOW, much of the action the IAT will see is at the lower part of the table. Let's say I drive the car from spring to fall, so temps may range from 5C to 45 or so.
Having said that, if I had a corresponding MAT installed, while the IAT is seeing a fairly stable temp for air, the MAT temps could continue to rise from heat soak and additonal friction on intake. So I tried to correlate what the current table for MAT has as a compensation and move those values further down the table to the IAT measurements corresponding to the MAT measurements. Let's say the motor is operating nominally at a coolant temp of 80-84C. However, I am driving in 10C weather. Since the ECM is seeing
10C temps, I felt I needed to have the 80C MAT compensation values in the
10C cell of the table at least as a beginning point.
BTW, feel free to tell me I am totally out to lunch on this, but it helps to write it out and check the logic of what I am doing.

 

I cannot remember the logic i used to come up with a base starting point on the table. someday id like to convert it to *F to make it more understandable. since its also been converted to IAT the upper portion of the table is never used, i like to be able to tweak the table to add more resolution by using almost the entire table. keeping the upper few cells for unavoidable heat soak while sitting in traffic on a hot day.

 

 

Perhaps you could edit the Xdf to show F rather than C.

 

i would love to be able to do that, i just dont know how yet

 

on the left hand side on the parameter description click on the edit and change representation.

 

thanks, ill look into that. id also like to rescale the table so i can use the whole table, not just the lower half of it. even in the boiling hot summer the IAT temps have never gone over 140*F, with 110*F+ ambient temps and underhood temps. any suggestion on how i would go about doing that?

 

That im not sure on, tell my wife to get off my tuning laptop and I will give it a look lol

 

LMAO! i had the same problem until i bought my wife a kindle fire

 

she sticks me with the macbook pro nice computer but I can't look at any .bin's or tunerpro. I guess the hp screen being a 17" is nice to play facebook games. lol

 

To display it in Deg F is already setup for you or you can create one if you don't have it.
Go into the Aquisition menu, Edit definition...
Create item under "Values" for "MAT Deg F" with 1:1 conversion sent to a lookup table.
Create the Lookup table (see pic and chart)

Then edit the XDF for the item and change the row "lables" to match the Deg F values. Text box has the conversion values if you have a S_AUJP file.
Make sure to set the DA associated units box to the new item in deg F.
Then Tracing will work with the correct values.

 

Table graph.

Doing that will display in Deg F.
The editing of the bin values are not in Degrees on this one so there is nothing to do with that conversion.
Jp

 

 

You need to change the code that does the look up of the table. That is the only way to rescale the table temperature points.

RBob.

 

looking at a few suspect places to start but found this, could be the problem ive been having since it doesnt seem complete?

; **************************************************
; * MAT TABLE FOR 1K PU
; * 17 LINE TABLE
; * (ORG 0xF12B IN ANHT)
; **************************************************
; - VAL TEMP DEG C A/D (INV) NOT DONE YET
; -----------------------------
LF133: .byte 0x00 ; = ??? 143 0 (151 DEG = 1)
.byte 0x2A ; = 215 121 6
.byte 0x3D ; = 155 76 22
.byte 0x4B ; = 132 59 38
.byte 0x55 ; = 117 48 54
.byte 0x5F ; = 106 39 70
.byte 0x67 ; = 97 32 86
.byte 0x6F ; = 88 26 102
.byte 0x78 ; = 81 21 118
.byte 0x80 ; = 74 15 134
.byte 0x89 ; = 67 10 150
.byte 0x94 ; = 60 5 166
.byte 0xA1 ; = 52 - 1 182
.byte 0xB0 ; = 44 - 7 198
.byte 0xC7 ; = 34 -14 214
.byte 0xE3 ; = 22 -24 230
.byte 0xFF ; = 00 -40 246
;---------------------------------------------------------------