Had the car out today with B7 T5 F9 and it wad running spot on - no flat spots through 3rd 4th and 5th
I remember when the first day i got the car back from my Revo dealer, they had the settings at B8 T3 F6 (they set T3 as they werent sure what fue i ran). On the drive home i had flat spots in 4th and sometimes 5th so i had a read on here and seen that most people run and decided B9 T5 F6 so i gave this a try and still had flat spots...Ordered new NGK Iridium Plugs and and ran some STP Injector Cleaner in with a full tank of fuel. Ran the full tank of fuel with injector cleaner in it and filled up again (Vpower). The next day i was still gettting flat spots sometimes 3rd and more commonly 4th and 5th so the issue was not resolved.
I had really been racking my brain with this as i didnt have this issue running stage 1 software on B9 T5 F9, The only thing i could put it down to was running to higher boost and something was pulling back or giving in. From logs i had done on B9 T5 F6 i had seen the boost powering in early around 3k RPM @ 1.7bar and dying off higher up the rev range which i wasnt too happy with also the AFR was running a little rich.
After trying B7 T5 F9 i noticed a huge difference, smoother power delivery and felt overal better, logs showed the boost coming in at around 1.5 - 1.6 bar vs 1.7bar with B9, The boost through the rev range on B7 & B9 is very similar, the main difference is you arent getting a huge load of boost hitting in at 3k RPM. Running B7 brings the boost in less aggresively but sustains good levels of boost right till redline. Ran some checks on the AFR and its running leaner which im also happy about as it was too rich with F6.
So today i done some more logs, checked all my CF's for each cylinder and could see they were all around 0, as i run Vpower i decided to try T6 and do some more logs. The car feels sharper with T6 and im not seeing any CF's above 3 at peak RPM so all good there. Still running great with ZERO flat spots
Im going to have a tinker around tommorow and try B8, im almost 100% sure that if i set B8 the flat spots are going to appear again, as i mentioned earlier the car was set at B8 by the Revo dealer and caused flat spots. If they do appear again then that settles it for me and i know its down to running to high a boost setting.
I will be attending a rolling road day on Sunday so will get the car on the rollers with B7 T6 F9 and see what it makes and get a look at the graphs.
Cheers Davie