Hello folks,

I need some help with clarifying some parameter in tunerpro rt.
Maybe some of the experts could explain the meaning and what I can change with it.

1. Decel Enlean BPW Factor (low DRPīs) <- what does DRP mean and what is it for?
2. Decel Enlean BPW Factor (high DRPīs)
3. low pulse width injector offset vs. BPW <- here I can let the injector get more fuel in some BPW areas, what is it good for?
4. How can I lean the A/F ratio out (what parameter) when I let completely off the throttle even BEFORE decel enlean (AF >18)?
5. Accel. Enrich. %BPW Factor vs Async Pulse <- is this how sensitive the ecm reacts to fast throttle opening?

For everyones aknowledge: The Tunerpro RT version 4 is used and the bin is a modified APYM with $6E (MAF). The mask is a modified one from tunedperformance.

Thanks in advance

Chris

 

1. Decel Enlean BPW Factor (low DRPīs) <- what does DRP mean and what is it for?
2. Decel Enlean BPW Factor (high DRPīs)

DRP => Distributor Reference Pulse. It's a metric that the ECM can use to determine the duration of an event, in terms of degrees of engine rotation. For example, in 8D (which I'm much more familiar with than 6E), there's also a parameter on how many DRP's an AE event will last. I believe one DRP is equivalent to one magnetic pole on the pickup coil in the distributor.

3. low pulse width injector offset vs. BPW <- here I can let the injector get more fuel in some BPW areas, what is it good for?

The ECM will automatically add the specified number of microseconds (or milliseconds) of additional pulsewidth. From what I understand on discusssions about Bosch III's... the old Multecs were inefficient at low pulsewidths, so this table gives them a little "help" to provide the required amount of fuel. When transitioning to Bosch-III's, that "help" is no longer required, so it's recommended to zero that table out, lest you end up a little richer at lower pulse widths.

4. How can I lean the A/F ratio out (what parameter) when I let completely off the throttle even BEFORE decel enlean (AF >18)?

In 8D, I'd probably lower the O2 R/L threshold at very low map, forcing the ECM to target a leaner AFR. Not sure what the 6E equivalent is. But if you're not in decel enlean and want to run leaner, then I think you have to play with the O2 R/L threshold... otherwise the ECM will continue to target the default 14.7:1.

5. Accel. Enrich. %BPW Factor vs Async Pulse <- is this how sensitive the ecm reacts to fast throttle opening?

I think this is more the volume of AE fueling applied on a delta-TPS event (like the accelerator pump shot on a carb), not necessarily how fast the ECM reacts. In 8D, there's a parameter for the threshold of delta-TPS for the ECM to react. Factory was 3.3% and I went to the minimum of .39%. Not sure if 6E has that. That change may not seem like much, but for a light throttle take off, it makes a huge difference (like parallel parking on a hill where you're feathering the throttle). I've found that is an absolutely critical parameter for dialing in throttle response for short runner manifolds like the Miniram.

 

So what will change if I go up or down with the value in this parameter?
It has to do with the decel enleaning. So if I shorten the number the car would go faster in decel enleaning? (less rotation of DRP to decel enlean)

I have a wideband showing me my AF ratio. And while cruising in 14,7:1, when I let off the gas (tps 0.57v), it will go to 12:1 for 3 seconds before it goes into decel enleaning (>18:1). That seems not right. I would love to know which scalar/parameter I can use to fix that.


I found the parameter "Minimum Delta TPS for Accel. Enrich." Sounds like the one you mean. It is rated at 3.91% the lowest value I can go is 0. Since I also have a good flowing tunnel ram what value would you suggest? I think 0 is not the best idea?

 

I'm not exactly sure. The term DRP's to me seems like another word for RPMs. At a higher RPM you'll get more DRP's per unit time, and vise versa for lower RPMs... you'll get lower DRP's per unit time. But, if my assumption is true, there's no indication about what constitutes high or low DRP's. Sometimes what you have to do is simply make a change and see how the engine reacts (and you have a WB, so you'd at least have the perceptiveness to see the change).

Again, I'm not as familiar with 6E. But I'm looking at ARAP in Tunerpro as I type this...

There are some other parameters labeled DFCO. Decel Fuel Cut Off. For what you're trying to achieve, I'd probably be looking at the DFCO stuff.

Among those is this parameter...

DFCO Enabled if conditions met for X, where the parameter is time. It apears to be 1 sec from the factory. Doesn't quite line up with your observation of 3 sec, but you might play around with these. It seems like the ECM is programmed to wait 1 sec for all other necessary DFCO parameters to be in effect before it will actually enable DFCO.

There's another parameter... DFCO Consecutive Minimum Delay. It's set to 6.39 seconds. I read this as the ECM won't simply enable DFCO in rapid fire succession. If you come out of a DFCO period and then let off the throttle again before 6.39 second elapses, the ECM will not enable DFCO.

I don't know that Tunerpro will allow zero. Even if you set it zero, I think the next time you open Tunerpro, it'll be something like .39%. But yeah, on mine, I wanted AE to come in if I even breathed on the throttle. Some might think it would make the throttle kinda twitchy, but not at all (at least for me). The Miniram absolutely needsthat kind of immediately delivery of AE fueling to get rid of the infamous Miniram stumble.

 

Reduce the min pulse width parameters (especially if running larger injectors):

;==============================================
; FUEL OUTPUT PARAM'S
; calib = msec * 65.536
;
;==============================================
LC3AB: FDB 0104 ; 1.580 msec Min Base PW
LC3AD: FDB 0104 ; 1.580 msec Default Pulse Width

 

Unfortunately I dont have this Parameter in my $6E. But weile trying to change some of the above Parameters, I reached a better running condition and faster dfco. Thanks for that so far!



Now I just need to figure out why my idle speed wont automatically go down while driving. For example: Cold start, 1200rpms, it stays there forever until I STOP the car and let it idling. Then it slowly settle down to normal 550rpms in drive and wont go up. (Function normally).

Attached is the picture with the iac parameters. I am pretty sure I can fix that by one of the parameters. Does anybody have an idea and can explain me the deadband error and the maf scale factor?