turdburglar44
Full Member
Karma: +5/-1
 Offline
Posts: 110
|
 |
« on: July 10, 2014, 01:33:05 PM »
|
|
|
I like to look at my timing table in true timing ( time (ms) btdc ) rather than angle btdc and thought maybe someone else would too. Here's how;
Apply this conversion to each column. ( let me know if there is an easier way )
TimingAngle / ( rpm * 0.006 ) = time (ms) before top dead center
The reason I like to do this is because it gives you a great indication of where your peak torque is. It will generally be the lowest value because that will be where you have the highest load. Granted a veteran tuner can see this in the angles but I like to see it both ways.
For anyone interested here is the conversion to come up with the equation.
1rotation/1minute =
360degrees/60000ms =
.006 degrees/ms
Rpms * .006 degrees/ms =
Degrees/ms
TimingAngle/(degrees/ms) =
Time
|
|
|
|
|
Logged
|
Tuning is the easy part...
|
|
|
|
|
|
SB_GLI
|
|
« Reply #2 on: July 11, 2014, 07:59:40 AM »
|
|
|
Nice username  You can set up VisualME7Logger to display and graph this information by using the following expression: Round([zwist] / ( [nmot] * 0.006 ), 2)
When logging this information what should we be looking at? At WOT, my Jetta is pulling a pretty even .6ms all the way to redline. What is optimal time for WOT, cruising, part throttle...etc? Can anyone provide examples? |
|
|
|
|
Logged
|
|
|
|
|
nyet
|
|
« Reply #3 on: July 11, 2014, 08:47:27 AM »
|
|
|
I will add it to ECUxPlot as well. Thanks!
|
|
|
|
|
Logged
|
|
|
|
|
eliotroyano
|
|
« Reply #4 on: July 11, 2014, 10:33:13 AM »
|
|
|
Here is another great thread of ignition timing calculation. All we need to know is the timing/angle when we need to fire the spark plug to allow mixture explosion produce most of it force/pressure at the best moment for maximum power (MBT). In theory we can do all calculations as complex as we can but talking real data (cylinder pressure per ignition timing plus other factors) will tell us if we are doing right or not. Of course an theoric aproximation will allow us to reach the best timing with the less effort possible. That is what I suppose ignition timing (msec) vs flame speed is all about. Here is another great post about it calculation --> http://www.ecuconnections.com/forum/viewtopic.php?f=2&t=81. |
|
|
|
« Last Edit: July 11, 2014, 10:36:19 AM by eliotroyano »
|
Logged
|
|
|
|
|
jibberjive
|
|
« Reply #5 on: July 15, 2014, 05:19:47 AM »
|
|
|
It would be interesting to see someone populate a table with the theoretical values based on combustion chamber geometry and see how that table compares to KFZWOP.
|
|
|
|
« Last Edit: July 15, 2014, 05:28:07 AM by jibberjive »
|
Logged
|
|
|
|
turdburglar44
Full Member
Karma: +5/-1
Offline
Posts: 110
|
|
« Reply #6 on: July 15, 2014, 09:26:41 AM »
|
|
|
That would be very cool. I've always wondered how they decide optimum torque.
|
|
|
|
|
Logged
|
Tuning is the easy part...
|
|
|
|
eliotroyano
|
|
« Reply #7 on: July 15, 2014, 10:32:56 AM »
|
|
|
That would be very cool. I've always wondered how they decide optimum torque.
I have heard about using a spark plug build in a pressure transducer to get best MBT possible. |
|
|
|
|
Logged
|
|
|
|
|
ddillenger
|
|
« Reply #8 on: July 15, 2014, 11:45:12 AM »
|
|
|
I have heard about using a spark plug build in a pressure transducer to get best MBT possible.
I have these for my car. |
|
|
|
|
Logged
|
Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
Email/Google chat:
DDillenger84(at)gmail(dot)com
Email>PM
|
|
|
NOTORIOUS VR
Administrator
Hero Member
Karma: +58/-7
Offline
Posts: 1056
|
|
« Reply #9 on: July 16, 2014, 07:08:56 AM »
|
|
|
I have these for my car.
Jealous... which one did you get? |
|
|
|
|
Logged
|
|
|
|
|
ddillenger
|
|
« Reply #10 on: July 16, 2014, 04:44:51 PM »
|
|
|
|
|
|
|
|
Logged
|
Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
Email/Google chat:
DDillenger84(at)gmail(dot)com
Email>PM
|
|
|
|
carsey
|
|
« Reply #11 on: July 19, 2014, 02:15:39 PM »
|
|
|
Did a quick conversion on mine using the above maths ion 1st post and my stock timing is curently about 0.5seconds between 3250rpm and 5800rpm and then goes to 0.6x onwards to 6250 when log stops
|
|
|
|
|
Logged
|
|
|
|
|
nyet
|
|
« Reply #12 on: July 19, 2014, 04:14:29 PM »
|
|
|
Latest ECUxPlot includes true timing ...
|
|
|
|
|
Logged
|
|
|
|
|
carsey
|
|
« Reply #13 on: July 19, 2014, 04:21:22 PM »
|
|
|
JUst downloaded the latest one there.... Pretty handy! Looks like I can have a touch more advance, as well as looking at knock logs, if the 0.6ms theory is correct  |
|
|
|
|
Logged
|
|
|
|
|
nyet
|
|
« Reply #14 on: July 19, 2014, 04:28:49 PM »
|
|
|
JUst downloaded the latest one there.... Pretty handy! Looks like I can have a touch more advance, as well as looking at knock logs, if the 0.6ms theory is correct If you are riding knock recognition, there isn't much you can do other than: 1) water/meth 2) better gas 3) richen AFR 4) less boost 5) numb KR (not recommended unless you have detcans and a ton of experience). |
|
|
|
|
Logged
|
|
|
|
|
