PE Delay RPM

[PurplePiss]

Does this mean that if the rpm is below the PE Delay RPM value, that it will wait until it reaches that value to start PE or does it mean it will delay for a certain amounst of time and then kick in? The reason I'm asking is on my 05 GTO I have Delay RPM set to 0 so I'm in PE as soon as I hit it.

I was looking at a stock 05 Vette bin and they seem to be running extremely rich (up to 11.88), yet run more timing. Is that better to run richer with more timing or leaner with less timing? Does the differance in weight and gearing affect how lean and how much spark you can tolerate? I believe there is a differance of around 500 lbs between the 2?

[jimmyblue]

It means that below this RPM, PE will start after delay
and ramp up at the enrichment rate while over it, the
PE should come on immediately (but ramp?). F-bodies
have no delay and an immediate (1.000) ramp rate.

You don't want to be waiting for PE. It's delayed on
trucks, I guess for towing economy reasons but that
really hassles the guys who just want sporty driving.

All of the factory tunes seem over-rich. Try 12.5ish
and fit the spark up, cut-and-try. You could probably
gain a little more by going even leaner but you may
as well ease into it.

[PurplePiss]

Where do you set the delay?

My stock ramp up rate was 1.0 and I set it to 2.0 so that it comes in quicker. Is that right?

I also set the rpm to 0 so I'm in PE as soon as I go WOT. Is that ok?

I guess the basic problem I'm having trouble understanding is how to you determine what the PE curve should look like and how do you optimize the timing at each load point and rpm? Do you set PE to 13.0 across the board and then see how much timing it can tolerate in each cell by trial and error? Do you only modify the cells the car hits when going WOT? (.64-.72) Then part throttle when you not in PE, you would be optimizing the spark based on the 14.7 it is commanding from the factory(unless you change that)? Hope that all makes sense.

[PurplePiss]

ttt

[jimmyblue]

PE doesn't know from load, that's MAP and the OLFA table
wants to do that job. But if you're in PE and PE is fatter,
then you're stuck with the single PE profile. If you want to
optimize half, 3/4 throttle (like for an aggressively driven
street car) then you might prefer to do your power enrich
tuning in the OLOFA table and save the PE for full-WOT,
fuel fade kind of things. That would mean leaving the PE
table low except when it's needed (and it might never be).

Ramp rate, 1.000 = "all in, now". See it in the fuel air mult
PID, it proably steps from 1.000 to 1.250 (if you didn't
change the PE table) in one "tick". If it does this as soon
as you get above the MAP and TPS PE criteria then you
have no delay, and fuggedaboudit. Think some trucks have
delay on them, was not accessible, and the guys had to hit
up HPTuners for a minor modification to access it. But on
cars I think there is no delay anyway.

[PurplePiss]

So your saying by setting it to 2.0 I actually slowed down the PE rate?

I'm not sure I have this OLFA table everyone is talking about. Is it named something else for th 05 GTO?

How do you figure out what the timing map should look like at all points and what the PE curve should look like?

I have attached my latest tune. Can you check out the VE, PE, HO tables?

SCRATCH THAT, STILL CANNOT UPLOAD LS2 BIN FILES. IS IT ME?

[Chris@HPTuners]

PE delay is used to delay the onset of PE mode. We don't actually show the delay in the editor because setting the delay RPM to 0 eliminates the delay.

Now the Enrichment rate is how much every loop the PCM increases the EQ ratio to match the desired PE EQ. ie. if your in closed loop the commanded EQ is 1.0 and then you hit PE mode the commanded EQ might be 1.2. If you set the enrichment rate to a large number like 1.0 then the PCM will immediately jump to the PE EQ ratio. If you set it to a small number like 0.01 then the PCM will ramp to the PE EQ ratio in steps of 0.01.

Chris...

[PurplePiss]

So if I set it from 1 to 2, that's not going to make PE come in any faster correct? Sounds like it would be on right away even at 1.0.

[EC_Tune]

Correct. Values >1 show no appreciable difference.

[jimmyblue]

Is this step "tick", the 12.5mS interval? If so you would
expect to see 8X the "PE rate" applied per scanner frame
at the usual 10Hz rate until the target value is reached.
Meaning anything over 0.03 or so, would look like instant
in the logs (but really take a whole tenth of a second to
roll on fully from 1.000 to 1.250, in this example).

[PurplePiss]

Do we have that kind of resolution to see that? I mean, wouldn't it be almost instantaneous to go from 14.7 to 12.5?