Announcing the second forum group buy on Techtom MDM/CMX monitors! - Page 8

mpg9999 · 03-15-2003, 12:05 AM

Got mine as well. Had to take the car for a quick spin tonight to test it out. Thanks Greg.

-Mike

jp314 · 03-15-2003, 09:37 AM

I e-mailed Technosquare about the CMX manuals, which are written in Japanese.
They said they would e-mail me the English version when it is translated.

SR20 Inside · 03-15-2003, 12:39 PM

So they are different?

Quote:

Originally posted by jp314
It displays the timing at the ECU, not the base timing. [/b]

Todd98SE · 03-15-2003, 09:57 PM

Mine arrived yesterday. Unfortunately it doesn't seem to work with the stock 98' ECU, all i get is "communications error 02". I guess I'll have to wait until I swap in the 97' JWT Turbo ECU.

Thanks Greg for setting this up. Much appreciated.

Todd Friar
98' Sentra SE

Quick92Se-r · 03-16-2003, 12:55 AM

So you have to add like 6 degrees from what the unit says in order to know what your timing is?

jp314 · 03-17-2003, 08:55 AM

Quote:

It displays the timing at the ECU, not the base timing.

Quote:

So they are different?

Quote:

So you have to add like 6 degrees from what the unit says in order to know what your timing is?

The ECU is constantly adjusting the timing - advancing / retarding from the base timing setting.
You set the base timing, then the ECU adjusts for different conditions.
I watched mine on the MDM-100 for awhile yesterday. It displayed anywhere from 5 to 34 degrees.

njdan69 · 03-17-2003, 08:30 PM

I want my mdm-100 but I won't be able to check my mail for about 4 months. This sux stupid wars

SERprise In WV · 03-20-2003, 02:09 PM

Josh--

The CMX instructions are *very* simple, as it only has 2 buttons as you know.

Right button: Switches from TeMP-SPeeD-INJ-AFr(MAF). Temp is in *F, Speed is in MPH, INJector duty cycle is in %, and AFr (MAF) voltage is in, duh, volts.

Left button: Peak recall of the currently-displayed parameter. You can *only* do peak recall of one function at a time, the one that is being displayed.
Set the CMX to INJ, for example. Make a dragstrip run. After the run is over (before the ignition is turned off) and press the left-most button. Voila', it will tell you the highest INJector % attained during the run.

Same for the other parameters.

Just a tip: Using peak recall on the SPeeD parameter is kick-ass at an autocross for seeing if you went faster or not.

jp314 · 03-20-2003, 02:38 PM

I'm sure I can figure the CMX out, it's just nice to have the manual, in English.

I've only played with the MDM so far. Peak recall for 2 live parameters is nice!
I know my O2 sensor is good, watching it switch back and forth, rich/lean.

The MAF voltage relates to the intake air temperature, right? If so, does anyone have a chart listing the temperatures that correspond to the MAF voltage readings?

Nismo87SE · 03-20-2003, 11:49 PM

Voltage relates to the amount of air flowing through the sensor. I've noticed that the voltage changes just like a vacumm gauge would. For example at idle I my MAF is at 1.60-1.65V. If I was going say 2500rpm in 5th gear at 1/4 throttle or 0.84V TPS it would read ~2.4V. Say I go from 1/4 to 3/4 throttle, the maf would go from 2.4V to 3.4V. Just like how a vacuum gauge would read ~15inhg @ 1/4 throttle to ~7-9inhg @ 3/4 throttle. I peaked at 4.58V during a 2-3rd gear WOT run.

Quote:

Originally posted by jp314
I'm sure I can figure the CMX out, it's just nice to have the manual, in English.

The MAF voltage relates to the intake air temperature, right? If so, does anyone have a chart listing the temperatures that correspond to the MAF voltage readings?

mpg9999 · 03-21-2003, 09:45 AM

No, its not the temperature. It measures the amount of air, BUT, if the air is colder, there is more (its denser), therefor resulting in a higher voltage. Also, about your comparison to a vacuum. The reason for this is that the MAF voltage is a non linear representation of airflow.

P11GT · 03-25-2003, 09:34 AM

Thanks Greg, i got my MDM (+alarm) this morning, all the way over in the UK. After initially having doubts as to whether it would fit on my consult port, i can now confirm that it does indeed fit and function correctly. I am now a very happy man, especially as my local nissan dealer also gave me the Nissan FAST program on my laptop today aswell.

U12 2NR · 04-07-2003, 06:00 PM

Hey guys, Have any of you tried using an mdm-100n on any other pre obd-2 nissans? I'm very interested in buying one, but i'd like to make sure it would work first. Yes, i'm going to contact techtom now also, i just wanted to see if anyone had already tried it.

thanks

JCCT · 04-07-2003, 08:59 PM

I have tried it on a Z32 300ZX-TT and it works just fine, but when I pluged it on a Nissan Quest, it kept saying ERROR.
Guess MDM-100s don't like vans.

JCCT · 04-07-2003, 09:00 PM

What is a Nissan FAST program??

P11GT · 03-12-2004, 07:27 PM

sorry to dig up an old thread, but is anyone who was in this group buy, willing to trade their MDM100 for a Multichecker??

3BiP · 03-30-2004, 12:57 AM

they will not work on 98 and up