Search found 102 matches

by Mitchb
Sun May 19, 2019 11:19 pm
Forum: Tuning the EEC....
Topic: WOT Lean Transient Condition
Replies: 2
Views: 1303

Re: WOT Lean Transient Condition

I’ll take a look at this and your datalog soon.
The parameters you talk about and others have no meaning really until you graph them so you have a visual representation, make changes and then datalog what the affect was. I am very familiar with your catch code. I may ask a lot of questions.

Mitch
by Mitchb
Tue Sep 25, 2018 5:48 pm
Forum: Tuning the EEC....
Topic: Smoothing MAF curve/new curve
Replies: 3
Views: 2590

Re: Smoothing MAF curve/new curve

Yes. There is a function in excel for this. When I get to my laptop, I’ll post instructions.

Mitch
by Mitchb
Thu Aug 23, 2018 2:46 pm
Forum: Tuning the EEC....
Topic: Just installed a wideband and it's showing really lean at idle.
Replies: 40
Views: 12822

Re: Just installed a wideband and it's showing really lean at idle.

I want to discuss his situation when I have FACTS. Simple enough. I made a relatively simple request. It is up to him if he wants to persue this or just talk about it.
by Mitchb
Thu Aug 23, 2018 1:40 pm
Forum: Tuning the EEC....
Topic: Just installed a wideband and it's showing really lean at idle.
Replies: 40
Views: 12822

Re: Just installed a wideband and it's showing really lean at idle.

Your car is setup to run full time open loop? You are using an adjustable fuel pressure regulator? You can gain insight into this by running the engine at two different fuel pressures while monitoring intake manifold vacuum and RPM. This is what I would do: Disconnect the idle speed control solenoi...
by Mitchb
Thu Aug 23, 2018 12:37 pm
Forum: Tuning the EEC....
Topic: Just installed a wideband and it's showing really lean at idle.
Replies: 40
Views: 12822

Re: Just installed a wideband and it's showing really lean at idle.

The OP does not need tuning capability to answer the question.

Really, I am asking for details relevant to his questions. Just let him answer.

The state of how I am feeling has no relevance to any of this.
by Mitchb
Thu Aug 23, 2018 11:24 am
Forum: Tuning the EEC....
Topic: Just installed a wideband and it's showing really lean at idle.
Replies: 40
Views: 12822

Re: Just installed a wideband and it's showing really lean at idle.

Provide facts, then we will have a discussion.
by Mitchb
Thu Aug 23, 2018 10:08 am
Forum: Tuning the EEC....
Topic: Just installed a wideband and it's showing really lean at idle.
Replies: 40
Views: 12822

Re: Just installed a wideband and it's showing really lean at idle.

Perform the simple test and report the results. Then we'll talk.
by Mitchb
Thu Aug 23, 2018 8:30 am
Forum: Tuning the EEC....
Topic: Just installed a wideband and it's showing really lean at idle.
Replies: 40
Views: 12822

Re: Just installed a wideband and it's showing really lean at idle.

Your car is setup to run full time open loop? You are using an adjustable fuel pressure regulator? You can gain insight into this by running the engine at two different fuel pressures while monitoring intake manifold vacuum and RPM. This is what I would do: Disconnect the idle speed control solenoid...
by Mitchb
Wed Aug 22, 2018 11:44 pm
Forum: Tuning the EEC....
Topic: Just installed a wideband and it's showing really lean at idle.
Replies: 40
Views: 12822

Re: Just installed a wideband and it's showing really lean at idle.

So, I have a question: does your sampling of the exhaust accurately represent the A/F in the engine, particularly at low engine speed?
by Mitchb
Wed Aug 22, 2018 6:07 am
Forum: Tuning the EEC....
Topic: Just installed a wideband and it's showing really lean at idle.
Replies: 40
Views: 12822

Re: Just installed a wideband and it's showing really lean at idle.

What cam are you using and what is your setup?
by Mitchb
Wed Jul 04, 2018 10:01 pm
Forum: Tuning the EEC....
Topic: FN052M/N/BP, Manifold Volume, etc.
Replies: 2
Views: 1462

Re: FN052M/N/BP, Manifold Volume, etc.

These are the stock values for FN052N in excel for a 96 Thunderbird 4.6 NPI.
MAP_vs_airchg_Stock.xls
(31 KiB) Downloaded 126 times
by Mitchb
Wed Jul 04, 2018 9:50 pm
Forum: Tuning the EEC....
Topic: FN052M/N/BP, Manifold Volume, etc.
Replies: 2
Views: 1462

Re: FN052M/N/BP, Manifold Volume, etc.

Map vs Aircharge, FN052N is: slope of manifold absolute pressure vs air charge and is in units of inches Hg/(1 lbm/intake stroke). In your work, remember the following: Inferred MAP is defined by the linear equation y = mx + b where m is the slope of map vs air charge, x is air charge and b is the o...
by Mitchb
Mon May 01, 2017 7:32 pm
Forum: Tuning the EEC....
Topic: Timing after Max load RPM theory
Replies: 2
Views: 1850

Re: Timing after Max load RPM theory

Peak torque coincides more or less with maximum volumetric efficiency, maximum cylinder filling and maximum brake mean effective cylinder pressure. This is where the engine is most prone to detonation. So yes, this is where you want to scale back spark - how much - depending on the specific applicat...
by Mitchb
Sun Aug 07, 2016 12:15 pm
Forum: Tuning the EEC....
Topic: Isn't it catch 22, tune MAF first or injectors first?
Replies: 11
Views: 6051

Re: Isn't it catch 22, tune MAF first or injectors first?

That injector data will be correct enough to get your maf dialed in. No matter how good your data is, it will need some small tweaking. Once your maf is dialed in you may find you still have to adjust the low slope slightly because you might be rich or lean on decel. Since these Era of engines used...
by Mitchb
Tue Aug 02, 2016 2:37 am
Forum: Tuning the EEC....
Topic: Transient Tuning
Replies: 6
Views: 3556

Re: Transient Tuning

There are three main tables that determine the behavior during transient fueling. Surface equilibrium fuel as a function of ECT vs load, RPM multiplier and a load vs ECT time constant. Best to graph in excel the first two to get a clear picture of what's going on. However, before you begin you need ...
by Mitchb
Tue Aug 02, 2016 2:14 am
Forum: Tuning the EEC....
Topic: Isn't it catch 22, tune MAF first or injectors first?
Replies: 11
Views: 6051

Re: Isn't it catch 22, tune MAF first or injectors first?

Be very careful doing a WOT pull until your fueling is at least somewhat close, especially if running boost. Good idea to keep timing very conservative till fuel is close. This was discussed just recently. If your fuel error is different at the same maf voltage but different rpm ( 2volts 2000rpm vs...
by Mitchb
Tue Aug 02, 2016 2:06 am
Forum: Tuning the EEC....
Topic: Isn't it catch 22, tune MAF first or injectors first?
Replies: 11
Views: 6051

Re: Isn't it catch 22, tune MAF first or injectors first?

You need to use accurate injector data. Once you have this, all your fueling corrections will be made elsewhere.

Mitch
by Mitchb
Tue May 24, 2016 8:08 pm
Forum: Tuning the EEC....
Topic: Ignition Type: ICCD to TFI
Replies: 13
Views: 6594

Re: Ignition Type: ICCD to TFI

I'm not quite sure what you are saying, but all I will say is be careful! Many years ago I swapped an 89-93 Mustang GT MAF EEC into my 93 TBird. OEM the 5.0 TBird was push start CCD with a remote mounted ICM. It's been a while, but I think I used the OEM ICM with the A9L EEC. The car ran OK, but a ...
by Mitchb
Sat May 21, 2016 6:24 pm
Forum: Tuning the EEC....
Topic: Ignition Type: ICCD to TFI
Replies: 13
Views: 6594

Re: Ignition Type: ICCD to TFI

I'm not quite sure what you are saying, but all I will say is be careful! Many years ago I swapped an 89-93 Mustang GT MAF EEC into my 93 TBird. OEM the 5.0 TBird was push start CCD with a remote mounted ICM. It's been a while, but I think I used the OEM ICM with the A9L EEC. The car ran OK, but a s...
by Mitchb
Thu Mar 17, 2016 2:43 am
Forum: Tuning the EEC....
Topic: EEC-IV vs EEC-V
Replies: 77
Views: 51989

Re: EEC-IV vs EEC-V

It is during a long pull or when under a sustained high power level when the engine needs additional fuel for cooling. Not during coasting decel. For example: a fourth gear pull at, say, 1/2 throttle at stoich will eventually cause heat damage to the exhaust side of the engine. The model will output...
by Mitchb
Tue Mar 15, 2016 8:47 pm
Forum: Tuning the EEC....
Topic: EEC-IV vs EEC-V
Replies: 77
Views: 51989

Re: EEC-IV vs EEC-V

Exhaust temp control uses modeling that outputs a number for exhaust valve, flange and cat temp in terms of degrees. The big variables are engine speed and load and there are calibrations for the affects of spark and lambda on EGT along with other cals to change how the modeling calculates it's outp...
by Mitchb
Tue Mar 15, 2016 4:02 pm
Forum: Tuning the EEC....
Topic: EEC-IV vs EEC-V
Replies: 77
Views: 51989

Re: EEC-IV vs EEC-V

6. Catalyst temp control strategies that can mess with your A/F ratios when you're not paying attention (not sure if they were in EEC-IV or not). the flange temp hego temp and cat temp switches are eec-v only AFAIK, its as simple as disabling those switches Why would you want to disable this? I am ...
by Mitchb
Mon Dec 07, 2015 6:09 pm
Forum: Tuning the EEC....
Topic: WOT shift points with Tweecer
Replies: 12
Views: 7671

Re: WOT shift points with Tweecer

There are delays on each of the upshifts and you should make them 1 second, no less.
by Mitchb
Mon Dec 07, 2015 5:03 pm
Forum: Tuning the EEC....
Topic: WOT shift points with Tweecer
Replies: 12
Views: 7671

Re: WOT shift points with Tweecer

Don't know if your calibration has this - I know it is in 96 and up: There is a misfire monitor that runs in the background loop. The background loop controls, among other things, trans shifting. At higher engine speeds, the misfire monitor consumes a large segment of the background loop and might c...
by Mitchb
Tue Aug 18, 2015 12:40 pm
Forum: Tuning the EEC....
Topic: Desired AFR at W.O.T.
Replies: 10
Views: 5979

Re: Desired AFR at W.O.T.

10% ethanol has a stoich of around 14.07.

Mitch
by Mitchb
Mon Aug 17, 2015 4:15 pm
Forum: Tuning the EEC....
Topic: Desired AFR at W.O.T.
Replies: 10
Views: 5979

Re: Desired AFR at W.O.T.

You are probably going to want 12.8 - 13.0:1, but the spark you run will be more critical.
What is the stoich of the fuel you are using? You must factor this in to your desired AFR.

Mitch
by Mitchb
Fri Jun 12, 2015 1:48 pm
Forum: Tuning the EEC....
Topic: What happens if you give an engine "too much" spark at idle?
Replies: 7
Views: 4390

Re: What happens if you give an engine "too much" spark at i

Poor idle control. When adding more ancillary device load, ecu can add more advance with a double negative result. I think this is what was happening to me. If you are at MBT spark at idle, you will not have any reserve torque available to handle additional loads. You will also have diminished idle...
by Mitchb
Fri Jun 05, 2015 3:58 am
Forum: Tuning the EEC....
Topic: WOT shift points with Tweecer
Replies: 12
Views: 7671

Re: WOT shift points with Tweecer

Is the trans stock or modified?

Mitch
by Mitchb
Wed Apr 22, 2015 11:58 am
Forum: Tuning the EEC....
Topic: Preventing WOT overdrive shifts on 4r70w
Replies: 2
Views: 2222

Re: Preventing WOT overdrive shifts on 4r70w

Can't you do this using the solenoid truth table? Its been a while....

Mitch
by Mitchb
Tue Oct 14, 2014 9:45 pm
Forum: Tuning the EEC....
Topic: PID's checked in new California smog test method?
Replies: 7
Views: 4933

Re: PID's checked in new California smog test method?

Instead of disabling the monitors, it makes more sense to widen the window so it becomes easier to pass them. Each of the monitors has calibrations that define the operational requirements needed to run the monitor tests. Change the calibrations so it becomes easier to pass these tests. As far as I ...