T04E 60 trim run at 21 psi "LOG"

[whitegst97]

This is the run at 21 psi, i have a big dip in timing at around 5k, and highest timing is 16 deg but running rich still up there. One thing when i log the Airflow it only reaches a max of about 18lbs/min, is this because of the MAFT and AFC confusing the ECU? Comments and advice are greatly appreciated. Thanks

RPM Timing O2's
3230 27 0.1
3445 24 0.88
3531 22 0.92
3645 21 0.92
3750 21 0.92
3867 21 0.92
4137 18 0.9
4555 12 0.92
4680 12 0.92
4797 10 0.92
4957 8 0.94
5051 8 0.94
5359 8 0.96
5461 9 0.96
5578 9 0.96
5668 10 0.96
5773 10 0.96
5875 10 0.96
5977 11 0.96
6109 12 0.96
6164 14 0.96
6254 14 0.96
6492 15 0.96
6563 15 0.96
6625 16 0.96
6707 16 0.96
6824 16 0.96
6848 16 0.98

 

[psychlow]

One thing when i log the Airflow it only reaches a max of about 18lbs/min, is this because of the MAFT and AFC confusing the ECU?

You got it. The piggyback systems report less air to compensate for your larger injectors.

What does your base timing look like? If it's dead on at 5* BTDC, you might try retarding it 1-2 degrees and running another log.

One disadvantage of piggyback tuning systems like the SAFC/MAFT is that they increase the amount of timing advance because the ECU sees less airflow.

If that is indeed your problem, the fix to this is to run DSMLink or have a custom EPROM chip burned to compensate for your injectors. Then, you can run proper base timing and have correct timing advance.

 

[whitegst97]

Yeah im going to have to get an Eprom, i could maybe get more timing up top by leaning it a bit, what about the big dip in timing at around 5k, the 02's seem fine at around .92-.94 My timing is at 5 when the RPM's are at 750 or where the idle should be. I use to get alot more timing when i wa using my stock 450's at around 17 psi's. Thanks

 

[CanadianTSi]

The Dip is normal, everything looks exactly perfect, still looks like you could take some fuel out up top though.

 

[whitegst97]

That's exactly what i did, little while ago i took about 2% from 5k to 7.6k and it does respond better im sure a log would have looked better. I know they dip but you guys think that much of a dip is fine. I saw another look recently but im not sure if the person was using a chip or dsm link, the dip on timing went down to 14 i beleive. Thanks for your help

 

[CanadianTSi]

It's supposed to dip to around 9....exactly what your does.

 

[whitegst97]

Cool so it shouldn't go down lower than 9 deg. I guess i'll tune better in the higher rpm range and wait till i get a chip or dsmlink. Thanks alot guys

 

[CanadianTSi]

Cool so it shouldn't go down lower than 9 deg. I guess i'll tune better in the higher rpm range and wait till i get a chip or dsmlink. Thanks alot guys

With DSMLink the max timing you will get is 16 degree's as this is the max the 2G ECU gives, although you have the ability to add more.

 

[whitegst97]

Well i did a log in second gear, i had to re tune everything, my boost went up to 22 psi for some reason. That seems more like what i use to have it at, but maybe in third gear things change. The .98 volts seem to be a good point at higher RPM's because when i lean it above 5k and try to get the 02's to 94 or so it pulls timin. Anyways im in the process of buying a chipped eprom compensating for injectors and more.. Thanks

RPM Timing O2 1 Bank 1
3684 24 0.92
3867 22 0.94
4066 21 0.94
4297 21 0.96
4527 20 0.94
4898 19 0.94
5145 18 0.94
5387 11 0.96
5566 11 0.98
5875 14 0.98
6414 17 0.98
6598 18 0.98
6770 20 0.98