nevrenuf

Im confused by something.

In LS1Edit, there are two tables, WOT HOT and WOT COLD. Simple enough to understand which one gets used when.

However, the tables are described as "TPS% required at various RPM's to enter WOT MODE"

Look at the tables.. for instance, WOT HOT

RPM ...800.....3200.....5200.....7200
TPS%....64%.....19%.......19%......19%

If I understand the explanation of this table, then am I to determine that only 19% TPS is required to enter the "WOT MODE".. ?

And, does WOT MODE mean PE is enabled? If not, what the heck does WOT MODE mean anyway?

This doesnt make sense.... Can anyone help??

[ February 26, 2002: Message edited by: nevrenuf ]</p>

Black LS1 T/A

The table you want to modify for WOT Operation is the PE-RPM table, which defines the additional fuel that will be added at WOT vs. the current RPM. Positive adds fuel, negative reduces fuel.

The other parameters you brought up control when the PCM goes into WOT mode.

When the Coolant Temperature is below the 'Hot Temperature' threshold, the Cold WOT table is used. When The coolant Temperature is above 'Hot Temperature' threshold, The Hot WOT table is used.

The WOT Table controls when WOT mode is entered. For each RPM step, the value is the Throttle position in % required to enter WOT.

So yes, you can enter WOT Mode without the pedal being pressed to the floor.

Anyone else? Maybe I've got it wrong, but this is what I am understanding...

nevrenuf

[quote]Originally posted by Black LS1 T/A:
<strong>The table you want to modify for WOT Operation is the PE-RPM table, which defines the additional fuel that will be added at WOT vs. the current RPM. Positive adds fuel, negative reduces fuel.

The other parameters you brought up control when the PCM goes into WOT mode.

When the Coolant Temperature is below the 'Hot Temperature' threshold, the Cold WOT table is used. When The coolant Temperature is above 'Hot Temperature' threshold, The Hot WOT table is used.

The WOT Table controls when WOT mode is entered. For each RPM step, the value is the Throttle position in % required to enter WOT.

So yes, you can enter WOT Mode without the pedal being pressed to the floor.

Anyone else? Maybe I've got it wrong, but this is what I am understanding...</strong><hr></blockquote>

I think I acknowledged all of that in my post. I do understand when Cold is used, and when Hot is used, etc.

So you agree that 19% throttle position is a reasonable time to go to WOT Mode?

Also, I still have the question, does WOT = PE???

Black LS1 T/A

PE = Performance Enrichment

Black LS1 T/A

I'm re-reading your post and trying to understand what you are getting at.

I'll try another hit...
Think of this tab as 'Wide Open Throttle Power Enrichment'.

It's not really two separate things. All the different functions allow you to vary different parameters of 'Wide Open Throttle Power Enrichment', which means to add fuel at WOT. These adjustments allow YOU to define what WOT is. <img src="gr_grin.gif" border="0">

Again, my understanding. TIFWIW. <img src="gr_stretch.gif" border="0">

Doc99SShome

nevrenuf,

Yes, you understand those table. The WOT COLD and WOT HOT tables are for sending you into PE mode.

However, I am surprised about how low the TPS% is at the various RPMs. Each of my tables are identical but a little different than yours.

0---2800RPM 3200 3600 4000 4400--7200
---64%-------55%--45%--36%---26%

I hope this helps.

My question: Are these two tables the ONLY way to get into PE mode????

I want to dial in my MAF table so that I get 0% to -5% Ltrim fuel numbers, but I go into PE mode at two low RPM and low MAF flow rate values. So I cant tell by ATAP what most of my BLMs are, because when I go into PE mode the BLMs are being set to 0% which means that they are negative but I dont know how much negative.

Does anyone understand this situation???

I thought that I could increase my WOT HOT TPS% values and keep the PCM from going into PE mode at low MAF values. Will this work???

nevrenuf

Okay.. so we have it..

When you enter WOT MODE, you also enter POWER ENRICHMENT.

And since the TPS level is set to 19% for all but the lowest RPM's, we are effectively in the POWER ENRICHMENT mode all the time we are more than 19% into the pedal..

Seems absurd to me.. why have all this closed loop control if it goes away at 19% TPS..

Doc99SS

iTrader: (2)

Good question, I have no clue.

For tuning in the MAF table, I now have set the TPS % to 75 for both WOT tables.

19% is very low, my low value was 26%. This put me in PE very early in an easy run up thru the gears when I wanted to get some Ltrim values with ATAP. However, since I had 26% for my TPS value, the Ltrims were deflaulted to 0% by the PCM, which tells me the Ltrims were actually negative, but I dont know how much negative.

When the weather clears here in about 2 weeks (so it seems) I will be able to go out and do some more ATAPing with my latest flash program.

patSS/00

iTrader: (6)

I'm interested in this since I built the TPS enhancement circuit from the latest issue of Chevy High Performance. (I don't have LS1 Edit.) This circuit lets you adjust the point (throttle position) at which the TPS voltage goes to "100%". Now the interesting thing is that in that article, they dyno tested using this circuit and found an increase in torque. But, if the PCM is going to PE mode at only 19% throttle anyway, then using this circuit should make _no_ difference. (With mine, by SOTP it's hard to tell if there's a difference.)

Black LS1 T/A

[quote]Originally posted by nevrenuf:
<strong>... since the TPS level is set to 19% for all but the lowest RPM's, we are effectively in the POWER ENRICHMENT mode all the time we are more than 19% into the pedal..

Seems absurd to me.. why have all this closed loop control if it goes away at 19% TPS..</strong><hr></blockquote>

It doesn't seem so absurd to me.

Looking at the tables for a stock 1998 Ls1 T/A:

0000 to 2800 RPMs @ 64% WOT
3200 ------- RPMs @ 55% WOT
3600 ------- RPMs @ 45% WOT
4000 ------- RPMs @ 36% WOT
4400 to 7200 RPMs @ 26% WOT

RPMs - Multiplier
0000 - 1.1134
4000 - 1.1163
8000 - 1.1211
1200 - 1.1589
1600 - 1.1676
2000 - 1.1909
2400 to 7200 - 1.2403

Temp - Adder
-40 C -> 0.3910
-30 C -> 0.3485
-20 C -> 0.3093
-10 C -> 0.2690
+00 C -> 0.2273
+00 C -> 0.1857
+20 C -> 0.1440
+30 C -> 0.1056
+40 C -> 0.0640
+50 C -> 0.0235
+60 C -> 0.0000
+70 C -> 0.0000
+80 C -> 0.0000
+90 C -> 0.0000
100 C -> 0.0000
110 C -> 0.0470
120 C -> 0.0940
130 C -> 0.0940
140 C -> 0.0940

0000 to 2800 RPMs @ 64% WOT
3200 ------- RPMs @ 55% WOT
3600 ------- RPMs @ 45% WOT
4000 ------- RPMs @ 36% WOT
4400 to 7200 RPMs @ 26% WOT

... you have to be over halfway into the throttle to get Power Enrichment at RPMs below 3600 RPMs. If you are OVER 4400 RPMs, you need to be at 1/4 throttle to enter PE Mode.

Why do you think that is so absurd? <img src="gr_stretch.gif" border="0">

From the rest of the equation, I see a graduated multiplier through that RPM range, with more fuel added according to Temperature.

Seems reasonable to me. <img src="gr_stretch.gif" border="0">

Ira

I'd guess what you're seeing is a response to the smog testing laws. I'd guess the car never sees over 3200 RPM in that test and you get a lot better control of the power if you turn off closed loop. They leave it on for gas mileage at cruise but turn it off any time you're thinking of wanting power.

Irs

Chris Jones

Someone explain the multiplier. I mean, what is being multiplied, the VE tables?