RAD69

Time, Engine load, Corrected load, Actual load, Duty Cycle.

9.31 6.45 0 2.2 0
9.65 6.45 0 4.45 0
9.97 11.65 8.7 6.6 74.2
10.31 11.65 11.15 9.05 70.7
10.63 11.7 11.6 10.55 59.8
10.96 11.65 11.6 10.1 63.3
11.29 11.45 11.5 9.65 66.8
11.61 11.2 11.3 9.05 70.7
11.95 11.15 11.15 9.1 72.3
12.29 11.1 11.1 8.75 78.1
12.61 6.25 11.1 1.45 0
12.93 6.45 5.5 2.6 28.9
13.27 11.85 9.55 6.5 80.5
13.62 11.8 11.55 9.4 70.7
13.95 11.75 11.75 10.35 63.7
14.29 11.7 11.7 10.1 64.5
14.63 11.65 11.65 10.05 64.5
14.95 11.65 11.6 10.15 64.5
15.29 11.65 11.6 9.85 65.6
15.63 11.65 11.6 9.8 68.8
15.97 11.5 11.5 9.65 67.6
16.29 6.45 11.45 1.9 0
16.63 6.45 11.45 1.2 0
16.96 11.85 7.35 4.7 89.8
17.31 11.85 11.2 6.95 95.7
17.65 11.85 11.75 9.2 80.5
17.99 11.85 11.8 10.8 62.1
18.32 11.85 11.8 10.5 64.5
18.66 11.85 11.8 10.35 66.4
19 11.8 11.8 10.4 64.8
19.32 11.8 11.75 10.35 65.2
19.65 11.8 11.75 10.25 66
19.99 11.6 11.7 9.95 66.8
20.33 6.45 11.65 1.75 0

This was a second, third and most of a 4th gear pull. You can see the duty cycle is doing exactly what my boost guage shows, goes up to almost my max boost, then drops a lot, then comes back up a bit. The car feels so strong at the higher boost levels, I really wanna get this boost all the time.

What exactly is corrected load? It seems that when there is a large correction I get a higher duty cycle. I am not exactly sure how to interperate this log. It is a cause and effect relationship.

Any thoughts???

xr4tic

but it looks like it lags behind engine load. It could be based off of the barometric pressure sensor or something.

Actual load is probably based off of the MAF, whereas Engine load might be based off of RPM and TPS.

Since the duty cycle drops, it doesn't look like a mechanical problem, just that the chip isn't calibrated for the high-flow cat. You might want to contact PES and see if they offer any sort of chip that is made for a high-flow cat. I can't imagine that you're the only person with this problem (unless everyone else is running a boost controller)

skabaru

obviously the ECU is pulling back... have you logged timing? are you losing fuel at that level? you check the exhaust o2 readings? can the ECU pull based on the intake temps...

we had an loose ground on the intake temp sensor on my buddie's turbo miata and it would buck in 3, 4, and 5th gears under boost because they ECU saw intake temps of 100 celcius... but it was a pain to track down....

Just trying to throw out some other potentials.... Is there a newer software revision or a different boost level chip local to you that you could try?

RAD69

I am happy to see the duty cycle do what the boost guage is showing. It felt like the ECU was doing it and that seems to be confirmed. At least is is not a mechanical problem.

I will try to contact PES. But I am not gonna hold my breath...

In your opinion - would you just opt for a boost controller? I am a little worried that I will lose any failsafes that the ECU has to pull boost in the event of a problem. But I guess it will still pull timing.

RAD69

I only run 94 octane and I have a big FMIC - so timing seems fine. I only see it pulling timing when I shift.

The o2 reading were fine the last time I looked, but I get 16.32ms on my injectors...


I should pull logs of those block again to confirm...

xr4tic

As for added safety, just keep in mind that you'll have to pay attention to how your car is running, but I'm sure you do that anyways, so it's probably not an issue, and there is no gaurantee the ECU will actually decrease the boost unless it goes into limp-mode.

RAD69

Good point. Thanks.

skabaru

I can't recall, can you log IAT on a nDBW?

skabaru

does it do it on bothe your street and race chips?

xr4tic

Yes, you can.