supersuk

iTrader: (5)

My coolant temps have been stabilizing at 215 degrees on boosted runs and if just driving around town it stays around 208 degrees. Time for a new gigantic radiator, some larger CFM fans, and a coolant reroute!! The ambient temps here in Hawaii are now around 85 and increasing. Good thing this is my play car.

Braineack

iTrader: (62)

what type of MS and install?

it stabilizes at 215* because MS doesn't output higher than that without work-arounds.

TonyV

iTrader: (17)

So MS shows max coolant temp as 215??
Didnt mean to threadjack but wanted some clarification so i know what i'm dealing with as well..

Braineack

iTrader: (62)

what type of MS and install?

it stabilizes at 215* because MS doesn't output higher than that without work-arounds.

supersuk

iTrader: (5)

I have a MS1 that I built myself. Right now i'm running the High Res 10g code. I did the TPS mod, and will be doing the fan control mod and the EBC mod. What kind of work arounds would I need to have it measure higher values?

So you're telling me that it doesn't go higher than 215? Damn, that means my car might have been overheating!! Well, its a good thing that the OEM water temp gauge never went a little past half way.

HKSturboMiata

iTrader: (1)

He meant without reach arounds.

supersuk

iTrader: (5)

So what the hell are reach arounds?

Braineack

iTrader: (62)

riddle me this first....are you piggyback or standalone? It's possible your easytherm bias and resistance values are simply off.

as far as a reach around, you'll need to see what the water cooled guys at msefi.com are doing. From my mild reading on the subject, since the 8-bit processor can only deal with so much data you have a scale from -40 to 215°. What I believe others were doing is making the easytherm scale and manually altering it so the MS can read withing the allocated 255 steps, but on a difference scale. The other is similar. You leave the scale as is (altough really why do we need to read -40°F) but you extend the resistance curve above 215, the MS wont do anythign with it, but on your laptop can read it...something like that.

supersuk

iTrader: (5)

Ahh, I see. I'm piggyback right now since I have AC and want it to idle good because of that. I really don't want to mess with the MS because its been working really well the way it is set up.

Hmmm, looks like a new gauge for me. Hopefully I can find an accurate gauge to replace the OEM one in the dash.

Braineack

iTrader: (62)

ok now, copy and paste the top section of your matfactor and thermfactor.inc files as generated from easytherm, and should be in your project folder's mtcfg folder after you copied them there....

supersuk

iTrader: (5)

So to make everything clear, you want me to copy and paste into a post so that you can see?

If thats the case, i'll have to do that when I get home later tonight.

Braineack

iTrader: (62)

yep. i wanna verify you are using the correct bias and resistance values. i assume you are sharing the ait and clt signals with the ecu.

supersuk

iTrader: (5)

Ok, will do.

IcantDo55

iTrader: (11)

When you go to your car in the morning check the temperature, then check the IAT and CLT and see if there all the same before you start the car. They should be really close, mine were 40* high on the coolant temps.

Thanks Scott for helping me fix it.

supersuk

iTrader: (5)

Here is the top part of the MATFactor;

; Generated using EasyTherm4.exe,
;
; Air Temp Thermistor Comment Field
;
; File generated for use with stock 2490 ohm resistor at R4
;
; Steinhart-Hart coefficients: A= 1.177757E-03 B=2.77375E-04 C= -2.945618E-07
;
; Input Data: Temp, degF Resistance
; 26 28681
; 106 2238
; 240 177

Here is the top part of the thermfactor;

; Generated using EasyTherm4.exe
;
; Coolant Thermistor Comment Field
;
; File generated for use with stock 2490 ohm resistor at R7
;
; Steinhart-Hart coefficients: A= 1.193449E-03 B=2.837733E-04 C= 6.840434E-09
;
; Input Data Temp, degC Resistance
; -20 16200
; 20 2450
; 80 320

Braineack

iTrader: (62)

you need to reflash the MS. Since you are piggyback you are sharing the CLT and AIT signals with the ECU. both the MS and ECU have bias resistors for the signals, when you add two resistors in parallel, the total resistance drops.

Assuming you have both R4 and R7 installed and you are sharing the sensors, you'll want to use these values:

CLT Bias 1280
Deg°F
-4 16200
68 2450
176 320


AIT Bias 1450
Deg°F
26 28681
106 2238
240 177


take caution when you flash it, save your map, unplug your coils and ignitor, reflash, then reburn the map, then plug stuff up again. make sure to copy the three generated .inc files to your project folder's mtcfg folder. (ex: .../car1/mtcfg/)



the odd thing here is, technically you should be reading about 30°F too cold on the CLT at least.....

supersuk

iTrader: (5)

I don't have R4 and R7 installed because i'm running parallel. I followed your DIY and some other threads a while ago. So If I did this, I don't need to have lower resistance values correct?

supersuk

iTrader: (5)

I'm gonna try and reflash the MS tonight. Since I'm running the High Resolution Code, do I still choose custom in easytherm or choose the Hi Res option?

Joe Perez

iTrader: (8)

I always select custom. This way it prompts you for the location of the file, rather than looking in a default location.

Braineack

iTrader: (62)

i run parallel and have both installed. i use those values and it's spot on.


without r4 and r7 try..2625 for clt and 3472 for AIT.

I know coolant will be correct, so if the car has been sitting, ait should be very close...if not I suck at math.

basically since I know 1450 is correct with R4 (2490), using the formula for parallel resistors.... 2490 and 3472 would equal 1450....



this also makes sense that you are displaying a tad higher CLT than you should....because you have an actual 2625 resistance, but told MS it's only 2490....that would make it output on the high side....but I'd guess only 4-5°F