2001 Cavalier Z24 N/A timing tables??

[JMHZ2401]

I have a 2001 Z24 (2.4) 5 speed. After lots of datalogging I getting timing advance way over the High Octance tables (or low Octane tables). Is there any other place the ECU gets timing advance from? I have heard at least one of person has seen this as well, but could not answer this. They thought it could be related to EGR. My car does not have EGR from the factory. Any info would be helpful. Thanks

[REDFOCZ]

Sounds like a secondary table is adding timing on top of the high Octane table. When you are in the editor go under the spark advance tab, you should have a spark correction table next to it, and this table will add more timing under certain conditions. If you post your tune up I could take a screen shot of what I am talking about.

Edit:

Here is a pick of my tune about the Seconary spark table

[JMHZ2401]

Thanks for the response. Here is a copy of my tune.

[TiredGXP]

Are you getting more advance than the HO(PE) table?

[JMHZ2401]

Are you getting more advance than the HO(PE) table?

Yes. My map maxes arounf 98+99KPA.

[Russ K]

Look at the High & Low octane spark tables, as they are higher then the PE spark tables.

Russ Kemp

[JMHZ2401]

Look at the High & Low octane spark tables, as they are higher then the PE spark tables.

Russ Kemp

Ok now question. I'm only concerned at this moment with spark in Power enrichment. SO I should only be looking at spark tables for PE correct? Normal HO and LO spark tables should not affect HO-PE and LO-PE correct?

Thanks for the responses.

[TiredGXP]

I believe that you want to use the HO(PE) table when in PE. Most values in that table are higher than in your high octane table (just doesn't look like it because the HO(PE) table starts at a MAP of 60 instead of 20kpa as in the High Octane table)

Looks like 24 of the 160 cells are lower than the High Octane table, five or so the same and the remainder are higher.

[Shane Hewitt]

JMHZ2401, did you ever come to a resolution regarding this matter? I too have been beating my head against a wall dealing with a '97 Z24 commanding far more timing than the available tables suggest it should.

I suspect that these cars do have the AFR Spark Correction table, we just don't have access to it....perhaps the HP guys could have a look at your tune file to confirm that is case, & possibly consider adding it for us.

[JMHZ2401]

JMHZ2401, did you ever come to a resolution regarding this matter? I too have been beating my head against a wall dealing with a '97 Z24 commanding far more timing than the available tables suggest it should.

I suspect that these cars do have the AFR Spark Correction table, we just don't have access to it....perhaps the HP guys could have a look at your tune file to confirm that is case, & possibly consider adding it for us.

No I have not. I seem to be getting 1-1.5 degree's extra timing than commanded.

[Shane Hewitt]

I'd be OK with 1-1.5 deg. I've been logging upwards of 3-5 in some cases.

[Bill@HPTuners]

Without the tune file along with a cooresponding scanner log its very difficult(at best) to find which tables(if any) are missing.

[Shane Hewitt]

Here is the stock tune file of the car I've been dealing with.

As an experiment, both JMHZ2401 & I have gone in & made all the corresponding cells in the HO(PE), LO(PE), HO(non-pe), & LO(non-pe) tables all match (although that isn't reflected in the tune file I attached) & still wind up with several degrees above what these tables suggest I should be getting, leading us to believe that another table must be contributing to the final timing we are seeing.

[Bill@HPTuners]

please post the .hpl file rather than xls.

[Shane Hewitt]

Here is a short WOT log. If you take 5800-6000 rpm, the HO(PE) table suggests the car should be commanding at most 30 deg., but the logs show upwards of 33 deg.

[JMHZ2401]

Here is a log from my car. If you look at the WOT part at 5317 RPM's KPA is 98 and I have 28 degree's advance. Under my tune ( posted in this post towards the top) at those settings it should be commanding 25 degree's in HO PE and between 19-21 in LO PE.