Woooohooooo MAFT-Pro is running !!!
- Thread starter chriso
- Start date
It's not a setting on the MAFT pro, but an output that we can see from the ECU. I can't remember what the values are, but it lets you see what the ECU is thinking on a 0-5 V scale if I remember correctly...
mhopemk3 said:
no, it's not.
it's what the ECU is doing to the base fuel calulation. as always, the info is on MKIIItech.com:
http://www.mkiiitech.com/forums/viewtopic.php?t=593
the point is there really isn't much you can do to stop the ECU from achieving stoich in it's preset ranges (cruise, idle). all you can do is help it to achieve stoich by satisfiying Vf.
I was just trying to make it reeaaalll simple.. Sorry if my wording is incorrect..
The good Doc knows more about this than I do!!
Thanks for the correction Doc!!
The good Doc knows more about this than I do!!
Thanks for the correction Doc!!
drjonez said:
Are you saying that we need to manipulate the pro's settings while trying to moniter what Vf is doing.
If so, would we use the oxygen feedback mode with afm unplugged?
Moniter it at the diag port, correct?
Wayne
Good question....How are we supposed to monitor this. What point is it on the Pro?3rdtimearound said:
chriso said:
I read the page Doc was referring to then went outside to the garage and paged through the sensor page to see if there was a Vf value to moniter there and didn't see one.
You will be getting mail.
Wayne
you supost to wire up the purple wire, to the vf terminal on the ecu i belive.. i missed it to... any ways, it should be on of the aux input's or v-input's..
Acccording to the 89+Standard Connections page, the purple wire (from the 10-pin Connector) is supposed to go to the wideband ground. Are we talking about an extra purple wire on the speed density harness? If so, does this wire get "Tapped" or "Spliced" into the Vf connection on the ECU?pimptrizkit said:
allright guys, i am about to give up. this is NOT hard.
Vf tells you what the ECU is doing. the whole point is to adjust your low and mid maps to bring Vf to 2.5V.
i'm not going to go over the MAFT pro connections AGAIN. click the link in my sig, it's on page 2. ALL wire connections are tapped.....unless you're using SAFC mode.
:3d_frown:
Vf tells you what the ECU is doing. the whole point is to adjust your low and mid maps to bring Vf to 2.5V.
i'm not going to go over the MAFT pro connections AGAIN. click the link in my sig, it's on page 2. ALL wire connections are tapped.....unless you're using SAFC mode.
:3d_frown:
drjonez said:
Gee Doc,
Now we are getting somewhere, would it dbe too much to ask where you moniter it at?
Wayne
Doc,
On version 4.65, there are a lot of options to set Aux 1 to. Should I use enable with + voltage or something else?
On version 4.65, there are a lot of options to set Aux 1 to. Should I use enable with + voltage or something else?
Aux 1 triggering mode should be set to 0 (aux trig off) since we are only monitoring with the aux wire.
drjonez said:
O.K.
I think I am finally starting to understand.
I appreciate you clearing this up for me.
I will take another stab at it tomorrow and watch the aux 1 voltage.
Should try to keep it at close to 2.5 in closed loop. right?
Now I am looking at a log that I made;
At cruise- around 2500 rpm
14.76 afr, tps 1.02 v; aux out .01 v, stays pretty constant for almost 100 counts in tuner pro.`
Mainscale set to 0.0, adding no fuel in low, mid, or high tables.
I am using stock 440's with stock ct 26, walbro and aeromotive fpr, with 22-23 inches of vacuum at idle.
Where do I go from here?
Wayne
does the AFR oscillate around 14.5 - 15.1? that's the "normal" closed loop behavior.
what is your fuel press set @ (vac line OFF)?
based on your Vf reading you need to take a bit out via mainscale or drop fuel press.
what is your fuel press set @ (vac line OFF)?
based on your Vf reading you need to take a bit out via mainscale or drop fuel press.
drjonez said:
Thanks for the prompt response!!!!!!
Fuel pressure is 32 lbs with vacuum line on and 42 lbs with it off.
My afr's bounce around from 14.4 to 18.1 at idle after good and warmed up.
My aux 1 voltage stays around 0.00 most of the time from what I can tell from my log.
Wayne