EFIDynoTuning Forum

I finally managed to transfer the tune and got it running on the first try.

What I'm seeing is that DASMIN is gone and replaced with a function (nice) and FN882 (pre-position) has been replaced with a higher resolution table. I think your stock pre-position values work fine for me as does the DASMIN replacement function, but the decay rate needs tuning. FN879 appears to be the decay rate function and intact from OE implementation, is that right?

Ok, thanks for confirming why dashpot adjustments in BE don't work LOL

It's taking me several days to transfer my older A9L2 tune over to the new one, but it's in progress...

I posted about what I believe is a non-functioning dashpot algorithm in my current (older) A9L2 based tune on https://eectuning.org/forums/viewtopic. ... 3f405815a8 and forgot this forum probably gets more traffic these days.

I have disabled and enabled the dashpot functions by zeroing them out and the datalogs show that it's not adhering to the changes I'm making at all. The base tune, based on the dates I can see in my revision history, appears to be mid-2016 timeframe. I may have screwed things up by mixing Binary Editor with Tunerpro RT, but am hoping someone can confirm what I may or may not be doing correctly. The reason for using BE is that my QH is not installed, but a TwEECer RT is - unfortunately, many of the adjustments I've made were made via BE as well. Since so much patching has been done on the A9L2 base tune, could that account for why making changes to the dashpot functions doesn't work when made from BE, even with this older circa-2016 base tune?

Tune and log attached. The main indicators are that the ISC DC moves very slowly and is basically not reacting to idle fluctuations at all and the dashpot doesn't track the RPM either. Thanks.

I will do that. When I originally datalogged my neutral idle airflow I was running a 70mm MAF from a '93 Cobra. I'm now running a 90mm LMAF and this appears to have altered the neutral idle airflow readings. I noticed that I'm unable to get my engine to idle below 600 RPM - with the timing locked at 10 BTDC and the TB set screw backed out all the way, I cannot get the engine to stall. Is this normal or is this indicative of a problem like a vacuum leak or something? The engine passes emissions with flying colors, with CO readings around 0.0 and HC readings that are a fraction of the idle standard for the year (1979).

Thanks, Mike! I've read through your instructions on idle tune many times, but not really sure how to go about doing this. At some point I had logged this combination and dialed the airmass calculations by averaging them at numerous RPMs around idle. What function/table are you looking at when you mention my idle airmass? I see... the neutral idle air @ 552 would be around 1.029 lbm/min...

Any suggestions how how to upgrade to the latest A9L2? Yes, I've got BE going there with a TwEECer RT right now. I've got a licensed copy of TunerPro RT as well as that's what I've been using for Buell tuning.

It's been years since I've looked at datalogs from the Ford 400 in my '79 Bronco, but I noticed that the idle was higher than normal and want to lower it to stock levels, which would be around 550-600 RPM. What I appear to have going on is that the ISC control is in lockout mode and unable to control the RPM via ISC at all. I am not using mechanical idle control and would like to continue to use the stock control. What's the 1st thing to do in making this adjustment? Datalog and tune attached.
Note that the engine has a 351W EFI lower adapted to it that is running a '93 Mustang Cobra upper, 24# injectors, 65mm TB, either 70mm Cobra or 90mm LMAF, long tube headers, mild flat tappet hydraulic cam, and EDIS8

I had a lot of luck using a CDAN4 EEC-V (JZP3 box) and 4R70W in an old Mustang - I had that thing dialed until the car was totaled. I believe I snagged most of the harness from a late model Crown Vic/Marquis as well.

I'm baaack! Previously used Shaker666 as my handle. Sorry to hear abou the prior post loss... there was a lot of useful info in here.

So have all the old forum posts been lost? There was a lot of gold in there! I just had to reregister on here.