facts on what's going on inside the motor

juma · Jul 2, 2004

reading the sensors while running...

I bought a ACTRON III super scanner from Pep Boys on sale this week for $199. Just took it out for run in the Titan to see what is what. The outdoor temp is 90 degree. The motor warmed up to 190 degrees and I drove down an interstate at 65 mph at about 1550 rpm. The temp occaisionally slipped down to 187 then back up. The MAF registered 3.9 pounds of air per minute (whats that in CFM?) and the IAT stayed at 104 degrees. In traffic stop and go, it rose to 109 degrees.

My Titan has a insulated air duct, throttle body bypass, and K&N flat panel. Anybody in the Northern Virginia/washington DC area with a stock Titan who wants to see what your truck does. PM me and I'll try to get with you.

juma

Big Platinum · Jul 2, 2004

Hey juma, have you tried to run it without the throttle body bypass so we can see any differences. 104 deg sounds pretty good for 90 deg outside.

juma · Jul 2, 2004

Big Platinum said:
Hey juma, have you tried to run it without the throttle body bypass so we can see any differences. 104 deg sounds pretty good for 90 deg outside.

to lazy to put it back stock...would have to take off the insulation and put the piece back in the airbox. I would rather find a stocker near me to test.

juma

Steve04SE · Jul 2, 2004

Does the actron III show timing, retard, etc?

juma · Jul 2, 2004

Steve04SE said:
Does the actron III show timing, retard, etc?

yep. its got 20 or so measures it can monitor, maybe more...I'm just starting to get familiar with it. I think I can record a session and then play it back which is what I need to do because trying to watch it and drive is like cell phoning.

you know how to calculate the cfm from that pounds per minute measure?

juma

IMADOGMAN · Jul 2, 2004

juma said:
yep. its got 20 or so measures it can monitor, maybe more...I'm just starting to get familiar with it. I think I can record a session and then play it back which is what I need to do because trying to watch it and drive is like cell phoning.

you know how to calculate the cfm from that pounds per minute measure?

juma

Juma, I have been trying to find an equation for your conversion to CFM. It will not use constant numbers, because the weight of the air is determined by the air density at the time it was measured. This is a function of air temperature and barometric pressure.

SupraTitan · Jul 2, 2004

Sounds like a great tool. I like the fact that it shows timing retard, no its time to test different grades of fuel. Also will this unit log any knock sensor intervention?

juma · Jul 2, 2004

SupraTitan said:
Sounds like a great tool. I like the fact that it shows timing retard, no its time to test different grades of fuel. Also will this unit log any knock sensor intervention?

if it sets a code, it will, even if it sets it just to count them for awhile. you can pull from both code sums that have triggered a mil light and those that are just accumulating data. I won't really know the answer on this one for awhile. juma

juma · Jul 2, 2004

SupraTitan said:
Sounds like a great tool. I like the fact that it shows timing retard, no its time to test different grades of fuel. Also will this unit log any knock sensor intervention?

yeah, grades of fuel....you could determine if 91 octane really gets more timing advance. never thought of that. juma

PHOEBISIS · Jul 2, 2004

13.5 Cu Ft =1 Lb

13.5 CU FT OF AIR WEIGHS 1 LB,so you were moving about 52 cu ft per minute.Charlie
PS This is about 1400 liters/min. 5.6X 800=4480 LITERS which is about the amount of air you would move at 1600 rpms at full throttle ,if you had 100% vol efficiency. This sounds right-but my arithmetic could be off,of course.
PPS Your max airflow should be about 3 times as much as 4480 liters,or about 13440 liters/min.(5000rpms-peak hp) is about 3 times 1600 rpms).This would be about 37 lbs of air per minute.Why don't you nail it,and see what the pounds per minute is?
This gadget ought to be able to make a rough guess how much HP you are producing from the amount of air intake.Does it have a HP reading?.

IMADOGMAN · Jul 2, 2004

juma said:
y

you know how to calculate the cfm from that pounds per minute measure?

juma

Juma, try this site...

http://www.vanirtech.com/efficiency.pdf

Using this formula, a "Standard Day" at sea level (59 deg F and 29.92"hg) you would be flowing 50.9799 CFM @ 3.9 lbs/min

If you go to 4000 ft in elevation, using the same temperature and barometric correction for altitude, your 3.9 lbs/min would be approx 59 CFM (because the air is less dense).
In reality, you would probably show a lower lbs/min reading at the same throttle position, which in turn would be lower CFM.

Steve04SE · Jul 3, 2004

juma said:
yeah, grades of fuel....you could determine if 91 octane really gets more timing advance. never thought of that. juma

You read my mind. :cheers:

juma · Jul 3, 2004

I guess you could also perhaps validate improvements in airflow if you are getting more airflow for a given throttle opening percentage. colder air would have a greater volume/pounds per minute...making a list.

juma

Austin · Jul 3, 2004

If you go to www.obd-2.com, you can buy a laptop based OBD2 scanner.

Logging capability, graphing capability, etc - it's the way to go.

juma · Jul 3, 2004

Austin said:
If you go to www.obd-2.com, you can buy a laptop based OBD2 scanner.

Logging capability, graphing capability, etc - it's the way to go.

this actron thing can log data and its got a button for printing a display. but, I'm sure its not up to the laptop based computer capabilities. got a lot to learn on it. juma

syntrix · Jul 3, 2004

Austin said:
If you go to www.obd-2.com, you can buy a laptop based OBD2 scanner.

Logging capability, graphing capability, etc - it's the way to go.

Awesome, I have that scanner (go alex!!!), and I also have a vag-com, so two obdii logging laptop based tools!

I posted in the general area, and I'm gonna try to hook up on Sun or Mon. I have lot's of experience in logging data and generating useful charts. If the right info is there that can be read from the ecu, we might be able to do obdii dyno's which, pending the vehicle and ecu, can actually match a dyno run tq for tq!

so if they sync up, I'll know very soon and share all findings with you all!

25psi · Jul 5, 2004

Juma,good find. What you should do is log the A/F ratio and timing if you can and watch what happens to them in the higher RPM and post it on here if you can.

facts on what's going on inside the motor

juma

Big Platinum

juma

Steve04SE

juma

IMADOGMAN

SupraTitan

juma

juma

PHOEBISIS

IMADOGMAN

Steve04SE

juma

Austin

juma

syntrix

25psi

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