Boosted e38 -- when do you enable PE?

[granatl]

I've been fighting a very limited part throttle popping. I never seem to be recording when it happens. Tonight, it made me wonder if I have my parameters to enable PE too high (i.e. the popping is because it's too lean and not in PE). Would you mind sharing?

MAP: 70 kPa
MAP Hyst: 6 kPa
Enable RPM: 2,000 RPM
RPM Hyst: 20 RPM

Hot PE TPS: 45% 0-2,000 RPM, 30% 2,500+ RPM
PE Delay: 4,000 RPM

[mowton]

I've been fighting a very limited part throttle popping. I never seem to be recording when it happens. Tonight, it made me wonder if I have my parameters to enable PE too high (i.e. the popping is because it's too lean and not in PE). Would you mind sharing?

MAP: 70 kPa
MAP Hyst: 6 kPa
Enable RPM: 2,000 RPM
RPM Hyst: 20 RPM

Hot PE TPS: 45% 0-2,000 RPM, 30% 2,500+ RPM
PE Delay: 4,000 RPM

I have found that the newer OS's don't seem to offer (or at least I can't find it) you the Cold PE TPS setting that I have seen in the past. This allowed you to set the throttle to say 5-10% and let the MAP (load) dictate when the PE was to activate. It appears that the "hidden" cold throttle setting is like 40-45% (seems like 42%). The Hot PE is only for when engine temps reach 248F.... again this is an educated guess based on what I have read.

Do need to see if the POP is fueling or you are into a very low timing area due to load and rpm. Also make sure you have tuned you VE at least from 4000 rpm and down. In the Blended mode, it is used to validate the MAF and again, I am not completely sure if the "richer of the two" would take precedence.

Ed M

[DSteck]

Set TPS enable to 5 and MAP enable to whatever you want. It'll go off MAP then.

[10_SS]

I've been fighting a very limited part throttle popping. I never seem to be recording when it happens. Tonight, it made me wonder if I have my parameters to enable PE too high (i.e. the popping is because it's too lean and not in PE). Would you mind sharing?

MAP: 70 kPa
MAP Hyst: 6 kPa
Enable RPM: 2,000 RPM
RPM Hyst: 20 RPM

Hot PE TPS: 45% 0-2,000 RPM, 30% 2,500+ RPM
PE Delay: 4,000 RPM

I would personally copy the stock ZL1 settings... which rely on TPS to enter PE... not MAP, since MAP is slow to respond... noticed this when I first got my Whipple on the 6 speed.. between shifts the PE was laggy when I had it enabling around 90 kPa. Aparently GM noticed the same problem so they enable PE based on TPS... ZL1 settings are seen in this pic.
MAP: 15 kPa
MAP Hyst: 6 kPa
Enable RPM: 300 RPM
RPM Hyst: 30 RPM

Hot PE TPS: 18% around 2,000 RPM, 19% 2,500+ RPM
PE Delay: 5,000 RPM, however I would cut this way back.

ZL1_PE.PNG

[granatl]

So far, so good. I didn't get to drive far on the ZL1 settings, but I did let it short shift and then gassed it w/o popping. Thanks for all the great info guys!

[mowton]

Set TPS enable to 5 and MAP enable to whatever you want. It'll go off MAP then.

Dave, even though there isn't the 2 TPS tables anymore, the Hot Throttle table will still command the TPS value below the Hot temp threshold? I use the same PE entry technique letting the load determine the need.

Thanks,

Ed M

[DSteck]

Dave, even though there isn't the 2 TPS tables anymore, the Hot Throttle table will still command the TPS value below the Hot temp threshold? I use the same PE entry technique letting the load determine the need.

Thanks,

Ed M

There's no hidden table on Gen IV. Doing what I said sets it to boost activated (unless you're able to somehow make boost with only 5% effective throttle area).

[mowton]

There's no hidden table on Gen IV. Doing what I said sets it to boost activated (unless you're able to somehow make boost with only 5% effective throttle area).

Dave,

My question/observation was based on the HPTuners transition from Gen III to IV removed the COLD TPS table and you were left with one titled HOT. Most of the tuning I do is with the other software and it doesn't differentiate between cold or hot and the above PE scheme works fine.

Another question is though the TPS% do not reflect the actual TP% PID being logged. I assume that the percentage in the table is the delta value from the idle value which would be like 22% or so. I normally set that value to 8%.

Thank you for the clarification.

Ed M

[DSteck]

Dave,

My question/observation was based on the HPTuners transition from Gen III to IV removed the COLD TPS table and you were left with one titled HOT. Most of the tuning I do is with the other software and it doesn't differentiate between cold or hot and the above PE scheme works fine.

Another question is though the TPS% do not reflect the actual TP% PID being logged. I assume that the percentage in the table is the delta value from the idle value which would be like 22% or so. I normally set that value to 8%.

Thank you for the clarification.

Ed M

Maybe it is mislabeled on Gen IV, but there's only one functioning.

I think Chris said the values in that table are the effective open area minus idle contribution. It doesn't correlate to any PID directly. The % values in the scanner correspond to percentage of angle and not area.

[SICK WS 6]

I would personally copy the stock ZL1 settings...

FWIW, on my ZL1 I did this.....

Set TPS enable to 5 and MAP enable to whatever you want. It'll go off MAP then.

...and have no more issues with not being in PE when under boost.