Post by flipflop on Nov 2, 2009 19:48:41 GMT -8
Disclaimer #1: The post is a bit long winded but it provides critical info. on the attched dyno picture.
Disclaimer #2: I'm a newbie when it comes to Dyno's and the terminology & a working understanding associated with the equipment and software used, so please go easy on me.
So I finally got this little motor of mine on a dyno today 11/02/09. Why I dynoed it: I plan on testing 3 other camshafts and need Technical and Visual Proof of the results. I wanted to see the torque characteristics of the current after market camshaft in the engine graphed out in a real world app. Also the engine has a lean misfire I'm hoping to cure and I'm just plain curious what it would do.
Results were as I expected based on a few other dyno sheets I've seen on 22re's(nothing to write home about here). Plus my truck is A/C equipped, stock clutch fan, and has to send everything through dual t-cases, it's very exhausting to the four squirrel’s under the hood...
Also make a mental note that the technician advised me to use a "corrected version" of the dyno results since I plan on testing several other camshafts out. The "corrected verision" uses a corrected set of parameter's(ex. humidity, air temp. ect.) That way regardless of the weather conditions outside each dyno pull will use the same set of predefined parameters for each dyno pull/run. Using a corrected verision should insure that the net results of each pull are as accurate as possible, thus there is a 2% correction/reduction to the actual numbers displayed on the dyno sheet.
I believe the Dyno used was a chassi dyno(DYNOJET).
Total of two pulls: a baseline pull, & second pull I enrichened the Air Flow Meter(AFM) two teeth on the little gear inside of the AFM.
On the dyno sheet (top graph) you'll see two colored lines (red & blue).
The blue line is the first real pull on the dyno and the red line is the second pull after enrichening the AFM. It was really cool to see how fast the torque curve ramped up from 1400-1600rpm's and then just hung there from 1600-4100rpm's
On the dyno sheet (bottom graph) at about 1500rpm's you can see the lean misfire I've been having. The red dashed line(13) is supposed to be ideal air/fuel ratio. You can see that advancing the AFM gear two teeth helped curve my air/fuel ratio so it's running closer to an ideal amount.
Another interesting observation on this graph is at 4500rpm's the air/fuel ratio is way to rich and just gets worse as RPM's increased.
So I should try and keep my engine RPM operating range between: 1600 - 4500 rpm's.
I noticed on the way home that the truck did run smoother and felt like the four squirrels under the hood drank a few can's of RED BULL.
flip.flop
Disclaimer #2: I'm a newbie when it comes to Dyno's and the terminology & a working understanding associated with the equipment and software used, so please go easy on me.
So I finally got this little motor of mine on a dyno today 11/02/09. Why I dynoed it: I plan on testing 3 other camshafts and need Technical and Visual Proof of the results. I wanted to see the torque characteristics of the current after market camshaft in the engine graphed out in a real world app. Also the engine has a lean misfire I'm hoping to cure and I'm just plain curious what it would do.
Results were as I expected based on a few other dyno sheets I've seen on 22re's(nothing to write home about here). Plus my truck is A/C equipped, stock clutch fan, and has to send everything through dual t-cases, it's very exhausting to the four squirrel’s under the hood...
Also make a mental note that the technician advised me to use a "corrected version" of the dyno results since I plan on testing several other camshafts out. The "corrected verision" uses a corrected set of parameter's(ex. humidity, air temp. ect.) That way regardless of the weather conditions outside each dyno pull will use the same set of predefined parameters for each dyno pull/run. Using a corrected verision should insure that the net results of each pull are as accurate as possible, thus there is a 2% correction/reduction to the actual numbers displayed on the dyno sheet.
I believe the Dyno used was a chassi dyno(DYNOJET).
Total of two pulls: a baseline pull, & second pull I enrichened the Air Flow Meter(AFM) two teeth on the little gear inside of the AFM.
On the dyno sheet (top graph) you'll see two colored lines (red & blue).
The blue line is the first real pull on the dyno and the red line is the second pull after enrichening the AFM. It was really cool to see how fast the torque curve ramped up from 1400-1600rpm's and then just hung there from 1600-4100rpm's
On the dyno sheet (bottom graph) at about 1500rpm's you can see the lean misfire I've been having. The red dashed line(13) is supposed to be ideal air/fuel ratio. You can see that advancing the AFM gear two teeth helped curve my air/fuel ratio so it's running closer to an ideal amount.
Another interesting observation on this graph is at 4500rpm's the air/fuel ratio is way to rich and just gets worse as RPM's increased.
So I should try and keep my engine RPM operating range between: 1600 - 4500 rpm's.
I noticed on the way home that the truck did run smoother and felt like the four squirrels under the hood drank a few can's of RED BULL.
flip.flop