ASE1

BobDrye · Posted: Wed Jul 30, 2008 12:11 am Post subject: ASE1

My SR20DET runs great with the GT, but it's hard to start. I went to the starting enrighment screen and increased ASE1 from 8 to 100. Now it starts great, but the engine is pig rich all of the time (9.3 AFR). This is the lower limit that my Zeitronix wide band will read, so it's richer than that. The WINTEC4 guide does not list ASE1. ASE1 is stated on the screen as a 20 second enrichment function. Why would this fuction continue after 20 seconds. Is it temperature related?

Thanks

Bob

SR20DET powered Lotus 7 picture http://www.usa7s.com/aspnetforum/Default.aspx?g=posts&t=2192 Look at the 3rd page for the present condtion!

**Uwe@EMI** · EMI Joined: 09 Mar 2008 Posts: 7 Location: Manassas, VA

Here's the long answer: [from Fred]

Most [not quite all yet] values in WinTEC4 have explanations associated with them. All you need to do is hit F2 while the field in question is highlighted.

Here is the Help Topic for ASE1 [After Start Enrichment #1]:

This enrichment ramps down from the programmed FPW at the start
of cranking to zero FPW 20 seconds later. It is always used
when the engine is cranking.
Try 10% FPW.

Here the value is represented by % FPW [Fundamental Pulse Width] - please note that this is a holdover from WinTEC3 and should actually read % GAMA.
On your engine monitor screen, you will note that there is a GAMA or FPW value in 00% displayed in the Fuel Box. GAMA is typically 100% until a fuel trim or adjustment is called.
After the TEC has been started, you will see the GAMA value slowly decrease as the ASE1 times out. Other enrichments will also show up here, such as ACE3 [Acceleration Enrichment #3]
When you have the warm-up table adding 20% extra fuel at a given temperature, you will see it's affect on the GAMA % in the fuel block as well.
A better choice for this particular issue would have been SE1 [Starting Enrichment #1], which would have only lasted from detection of RPM to One Second later.
All Enrichments are added to GAMA… even the VE corrections are added/subtracted from GAMA as they occur.
The TEC systems use an advanced fuel algorithm that is exponentially faster than mere lookup tables, something that was developed in the mid 1980's for the first TEC systems.
It runs like this:

LOAD X GAMA + IOT = Pulse width
This is simplified for discussion purposes here, but in essence the core of the fuel calculation.

LOAD is typically derived from the MAP sensor. If i.e. the reading is 100 kPa and you have a 1 bar sensor in the system, you are at roughly 100% load - should you have a 2bar sensor installed, then 100 kPa is roughly 50% load - consequently a 3bar sensor reading 100kPa would indicate roughly a 33% load and so on.
Note, that if you are using Blend in the TPS/MAP Blend parameters, then your load is based on TPS and MAP sensor readings with a bias based on your configuration tables and offset.

GAMA is normally the inverse of LAMDA, but in our case, it is the sum of all Fuel Trims, such as warm-up, EGO corrections, VE table corrections, Starting Enrichments, Acceleration Enrichments and any other % based fuel adjustment in the calibration. This number could, at any given time be as much as 300% depending on vehicle conditions.

IOT is the Injector Offset Time. You will find it in the General Engine parameters, and it is a value from -15.000 to +15.000 and must be adjusted in 0.125 increments [1/8 of a millisecond]

But how, you might rightfully ask, does this relate to pulse width in milliseconds?
Good question, as LOAD is a 0.0% to 100.0% value and GAMA is a % value as well.

In comes TOG [Time for One GAMA] it represents the Time in milliseconds for ONE full GAMA [100%] it can be anywhere from 3.000 to 30.000 milliseconds.
This value is limited only by the time available between injector cycles which decreases with RPM since the injection events are in synch with the engine.

Most tuners overlook the simplicity of the Electromotive tuning process by making huge adjustments in the VE table instead of selecting a better set of base numbers represented in this equation by TOG and IOT [Time for One GAMA and Injector Offset Time]. We can get more into the Theories behind these numbers, but it would be best to start a new Thread.

stanps · Stage 2 Joined: 22 Apr 2008 Posts: 58

I can speak to this last comment! I was running with the following settings:

POT = 8.25
IOT of -1
TPS Blend offset = .4
TPS Blend;
1000 1500 2000 2500 3000 4000 5000 6000
75 65 55 45 30 20 10 10

I had to add 10% to 15% in the 1500 rpm/40 kPa range and remove 10% to 15% in the 3000 - 3500 range. After thinking about this, I ended up making the following change;
1000 1500 2000 2500 3000 4000 5000 6000
50 50 50 50 45 40 35 25

The difference is a marked increase in smoothness and driveability. However I've yet to run in 5th gear at 3000 rpm and above yet, AND I've not verified this on the wideband ('cuz I still can't get it working).

Stan Smile