You're right about that, but I think most of that's covered. I've attached my tune a few posts earlier.
rpm is stable enough in my opinion but it's the vibration I want to get rid of...

I will post a log when idling, maybe you guys notice something wrong.

Thanks

 

idle searching is very often caused by large variations between affected and surrounding cells. needs moar smoothing (but that's just a guess, I can't open your MSQ from work computer)

 

here you are

 

My experience with the 1.6 is that it's sensitive to injection timing at idle. You can smooth it out by changing end of injection timing in the idle area if you are sequential. Since you are batch fired you don't have that option.

 

<p></p><p>why arent you using idle VE table?</p>

 

I would like to, but can't activate it right now I think...


Is this possible with MS2 firmw 3.3.3?

 

I thought that was ms3 only

 

You are correct, no idle VE cells outside the normal VE map in MS2.

I don't think 3.3.3 adds that feature either, but as a 3.3.2 user I'd sure like confirmation.

 

<p>no i was thinking ms3.</p>

 

too bad, it's a nice feature in my opinion

 

problem solved, bought a Link G4+

 

The fueling calculation is as follows:

PW = DT + (ReqFuel * MAP * VE[RPM,MAP] * AirDen * BaroCor * corrections)

Forget the corrections and we get:
PW = DT + (ReqFuel * MAP * VE)

Rearange the formula to find VE:
VE = (PW - DT)/(ReqFuel*MAP)

Assume we have 265cc injectors and a deadtime of 0.8ms, a required fuel value of 5.51 and want to find the PW at 80kPa with a VE of 55%:

PW = DT + (ReqFuel * MAP * VE)
PW = 0.8 + (5.51 * 0.80 * 0.55)
PW = 3.2244 m/s

We can rearrange to find VE as below:

VE = (PW - DT)/(ReqFuel*MAP)
VE = (3.2244 - 0.8) / 5.51 * 0.80)
VE = 0.55

Re scaling for new injectors example:
We upgrade to blue 540cc injectors, an assume a Required Fuel value of 2.25, and a dead time of 0.95

If we want to re-scale the VE table for new injectors we first solve to find the current PW (3.2244m/s in our example).
Then find the correction factor for the new injector. In our example using 265cc and 540cc injectors:

Correction factor = Old Injector cc min / New Injector cc min
Correction factor = 265 / 540
Correction factor = 0.4907

Applying this correction factor we find the new pulse width:

New PW = Current PW * Correction Factor
New PW = 1.58 m/s

Then we calculate the NEW VE value to populate our VE table as below:

New VE = (New PW - New DT)/(New ReqFuel * MAP)
NEW VE = (1.58 - 0.95) / (2.25 * 0.80)
New VE = 0.35 or 35%

 

Resurrecting an old thread.

Some more stuff. I have too much time on my hands at present!

I have had the wrong dead time in my MSQ for nearly 3 years. RX8 injectors. I had dead time set at 1mS. When I changed it to a "better" value of .8mS idle would go stupid lean. Not wanting to retune the whole VE, I had until now decided to just leave it at 1mS and live with it.

BUT...

You can use this spreadsheet that I've designed to recalibrate the VE table. I tried it, seems to work fine at idle, (the worst scenario, low pulse width). I still have to VEAL higher Pulse widths, but I think they should be pretty close hopefully. Use at your own risk, and if you don't understand why you might need it then don't use it.

https://drive.google.com/open?id=1lTiwZ ... uT4rBK2EhD

 

Some more stuff. I have too much time on my hands at present!

I have had the wrong dead time in my MSQ for nearly 3 years. RX8 injectors. I had dead time set at 1mS. When I changed it to a "better" value of .8mS idle would go stupid lean. Not wanting to retune the whole VE, I had until now decided to just leave it at 1mS and live with it.

BUT...

You can use this spreadsheet that I've designed to recalibrate the VE table. I tried it, seems to work fine at idle, (the worst scenario, low pulse width). I still have to VEAL higher Pulse widths, but I think they should be pretty close hopefully. Use at your own risk, and if you don't understand why you might need it then don't use it.

https://drive.google.com/open?id=1lTiwZ ... uT4rBK2EhD