92GTA

iTrader: (11)

I just installed new injectors, went from 19# to 30#, and my car at idle and in just VE runs perfectly now but it starts to bog the second I use more than just a couple more % throttle.

I see the following things in my 8D bin referring to AE:

Constants
Enrich Accel Delta TPS Pulse Width Factor
Enrich Accel Delta TPS Scale Factor
Enrich Accel Pulse Width Max. Limit Timer
Enrich Accel Ref Pulses (Asynch)

Tables
Enrich Accel Delta MAP Enable Vs. TPS
Enrich Accel Delta MAP Factor Mult. Vs. TPS
Enrich Accel Delta MAP Pulse Width Decay Factor Vs. Temp.
Enrich Accel Delta MAP Pulse Width Mult. Vs. Delta MAP
Enrich Accel Delta MAP Pulse Width Mult. Vs. Temp.
Enrich Accel Delta TPS Factor Vs. Ref. Pulse
Enrich Accel Delta TPS Mult vs. Delta TPS
Enrich Accel Delta TPS Pulse Width Factor Vs. Temp.

I have no clue where to even start and what direction to go on anything considering I think I'm going rich with bigger injectors now although while data logging I see no change in BLM's other than maybe just 1 or 2 +/-

TheGreatJ

Don't take my word as gospel. I've never done this before....I've just been reading for the last 4 months or so and think (hope) I have some idea of what's going on. Take it with a grain (or jar) of salt.

IIUC, the ECM doesn't factor injector constant into most of the AE stuff. Therefore, you have about 1.5 times (30#/19#) as much AE as you need. I'd try taking the "AE delta TPS mult. vs. delta TPS" and the "AE delta MAP PW mult. vs. delta MAP" tables and multiplying them by 2/3 across the board and see how that goes.

If I'm blatantly wrong someone please tell me/smack me. Thanks.

92GTA

iTrader: (11)

If I am getting more fuel than needed shouldn't I decrease the number rather than raise it?

Sounds good so far, I'll wait for someone to confirm before I burn it and test it though.

Thanks

nhromyak

They are relative scales though.

Decreasing these will decrease AE fuel.

What does your O2 (WB or NB) look like as soon as you hit the throttle? Does it change at all?

It depends on WHEN your O2 goes rich... is it IMMEDIATELY afteryou hit the throttle or all through-out.

What I have been finding is DELTA TPS is the first shot of throttle change. The DELTA MAP is a few ms after Throttle change.

However, changing your throttle DELTA TPS affects how get off the line too.

While Delta MAP will affect what happens when you go up a hill.

I would start with where the problem is, for instance, do you go RICH immediately, then it trails off into 14.7?

If so, try pulling out a little bit from Delta TPS.

IF it stays rich as the DELTA map happens AFTER initial Tip-in (DELTA TPS), then pull down the Delta MAP.

Good luck.

92GTA

iTrader: (11)

Upon close examination of my data log as a csv excel file, my o2 goes up as far as 990 after my TPS showed a max of only 4.18 which is not even full throttle.

Here is my excel file from my most recent drive:

DataLog

Right click, save as...

EDIT: I lowered my "Enrich Accel Delta MAP Pulse Width Mult. Vs. Delta MAP" and it seemed to help maybe a little bit. I'm going to try lowering it some more...

2nd EDIT: I've lowered it 4 times now and each test drive it gets better however I'm down to the point now that one more lowering of this table and it will be level and virtually non-existant. I almost have it to a point where I can feel PE kick in and bog it down a tad, I guess I'll adjust that next.

Is this right or should I be lowering a different table?

nhromyak

What is your fuel pressure?

Or maybe reset the Delta MAP, and change your AE at different temps... Lower this. This way, your GLOBAL AE will change...

Good luck.

I just thought of that. Sorry. I didn't think you were off that far.

Why did you change your injectors? Bigger motor? Bigger cam? that's a lot of fuel.

You will go after your Delta MAP and Delta TPS after you get closer from changing your AE vs. temp multiplier, or something like that. I forget exactly how it is...let's see...


HERE IT IS -
EA Delta TPS Pulse Width Factor Vs. Temp.
IIRC mine is at .42 AXCN is at .38

Bring yours down and see what you get.

BTW: What has been changed? Besides the injectors?
Check your EA Delta TPS factor Vs. Ref Pulse.
Only 1 is at 3.98 the rest are at .50

92GTA

iTrader: (11)

My fuel pressure is exactly 43.5psi which is what these injectors are rated. I went to 30# because I'll be installing a ProCharger in Feb. 2005. 3 of my stock injectors failed so why buy more than 1 new set. I've got a few small mods and a set of heads and a cam on the way in a few weeks. I figured I'd keep it simple and tune for the much larger injectors without changing much else that way when I do install the cam and heads it will be much easier. My mods are in my sig up top.

"Check your EA Delta TPS factor Vs. Ref Pulse.
Only 1 is at 3.98 the rest are at .50"

That's exactly what I show too.

"EA Delta TPS Pulse Width Factor Vs. Temp.
IIRC mine is at .42 AXCN is at .38 "

Which numbers in that table are you referring too? My table is @ 0.50 at 128* Deg Cel.

I've now lowered the entire table so that the highest number is 0.25 at 128* Deg Cel. I'll test drive that later....

Black 91 Z28

You might want to check out this sticky if you haven't already.

https://www.thirdgen.org/techbb2/sho...hreadid=195745

92GTA

iTrader: (11)

Thanks but yeah, I couldn't sense of it too much as far as what I would need to change and in what direction. Also my .ecu file says exactly what that post does whenever I click on each variable...

Black 91 Z28

Ah...mine doesnt. From looking at it it looks like you're on the right path.

There is also a constant "EA delta TPS Pulse Width Factor". From it's name it sounds like it would reduce the PW when in EA mode if it were reduced. But, I've never messed around with it.

92GTA

iTrader: (11)

"Enrich Accel Delta TPS Pulse Width Factor ". Mine is set to 0.09, think I should try lower it? It's a constant...

Lowering "EA Delta TPS Pulse Width Factor Vs. Temp" seemed to help allot, even after I put my "EA Delta MAP Pulse Width Mult. Vs. Delta MAP" back the way it was. A little tweaking and it should be good.

92GTA

iTrader: (11)

All is good now, actually all is great! It runs awesome now!

Thanks!

Black 91 Z28

Just for clarification for others that might have the same problem. What all did you end up doing?

92GTA

iTrader: (11)

It was the "EA Delta TPS Pulse Width Factor Vs. Temp" that made all the difference. All the others I put back to stock...