720CC Injector 20g HRC log ***Vehicle sputters after 6k RPMS

[nestamon99]

Set Up:
20g HRC set @15psi
Stock intercooler
3" O2 housing, Down Pipe and exhaust
Greddy/Denso 720CC injectors
3.5" MAFT Version 2.08

Settings on MAFT:
Mode Switch- 1.-On
2.-Off
3.-Off
4.-Off
Base knob- E
Idle knob- A
Mid knob- F
WOT knob- 0

Log Readings in 3rd gear:
RPM Knock Timing O2 Voltage Airflow
3531 0 37 .65V 195Hz
3562 0 37 .69V 189Hz
3656 0 33 .75V 371Hz
3687 1 31 .86V 415Hz
3781 0 32 .88V 447Hz
3937 0 31 .88V 504Hz
4125 0 31 .86V 541Hz
4218 0 30 .86V 598Hz
4375 0 30 .86V 661Hz
4562 0 29 .86V 730Hz
4812 0 29 .86V 856Hz
4968 0 27 .86V 1001Hz
5218 0 27 .86V 1102Hz
5437 0 27 .86V 1222Hz
5656 0 26 .86V 1316Hz
5906 11 23 .86V 1373Hz
6093 22 18 .86V 1392Hz
6343 22 18 .86V 1417Hz
6468 21 18 .86V 1392Hz
6625 21 17 .86V 1404Hz
6781 21 27 .47V 560Hz

Fuel Trims:
@WOT
Hi- 95%
Mid- 86%
Low- 118%

@idle
Hi- 95%
Mid- 86%
Low- 98%

The sputtering I feel happens when the vehicle goes over 6000RPMS, it is not caused by ignition. I have set the base idle at 0 and mid at 0 with all trims reading at 81% and no sputtering or knock found. The sputtering gets worse if I try to change the base setting to a higher injector (ei 730cc).
I know the sputtering is caused by lack of the tuning experience.

I am having one heck of a time correcting the sputtering without experiencing reduced power. The way the car sits now, the performance feels extremely good and the turbo pull is awesome before hitting 6600RPMS. Sputtering is my major concern. Any ideas? Suggestions??

 

[nytescion]

do you have a wideband at all? If so what does it read. It looks to me like you're going into rich knock. But I can't be sure cause I confuse myself alot when looking at logs. (which is why I watch my wideband and knock gauge religiously) Are you using an safc or chip also?

 

[NOSLO2PT0]

You simply have too much timing at 6k rpm. Stock 1G timing map is way too aggressive at 6k rpm. Plus, the reduced airflow the ECU is seeing from the MAF-T being dialed in for 720's is adding in to the excessive timing values. You must get an eprom chip compensating for the 720's, drop your base timing down to 0 or retard a few degrees, or simply convert the car to E85 and crank the boost up.

You could also tune with the AFC and just use the MAF-T for metering purposes. Gotta have a way to pull back some timing at 6k. This would be achieved somewhat by the AFC by increasing the amt of fuel being delivered (i.e. going + at the 6k rpm point).