Thread Starter
#21
Thread Starter
#21
Late to the party, but thought I'd offer some perspective. I have the Stratified 4-port on the S280. Nearing the end of the tuning process on E45.
The good part about the 4-port is that you are cleaning the valves with the spray . . . something that is useful with direct injection.
But but but . . . tuning has been a PITA. Dizzy sends you an ECU tune and then the separate fuel map for the aux fuel controller. Problem is, the 4-port seems to swing the AFR wildly with small changes . . . requiring multiple revisions of the aux fuel map alone before you can even consider getting the next ECU tune revision.
The aux fuel map is not complicated . . . it simply uses tables based on MAP vacuum against RPM. We have fallen into a pattern where he sends me the ECU tune, and I adjust the fuel map. That way, I can make multiple revisions of the aux fuel in a short time based on AFR in the logs and not get bogged down for a month going back and forth with him. I just set the 4-port table to where I believe it will be a little rich, then I adjust down until I get to where the AFR is hovering around the magic 11.7-12.2 for most of the RPM range.
Once I see good AFR, I send him the logs for input. Seems to be working so far. The latest tune is at 31 lbs of boost with good AFR. Will probably hold there, or even go back a tune, to be sure I'm haven't exceeded my risk tolerance for the block.
The good part about the 4-port is that you are cleaning the valves with the spray . . . something that is useful with direct injection.
But but but . . . tuning has been a PITA. Dizzy sends you an ECU tune and then the separate fuel map for the aux fuel controller. Problem is, the 4-port seems to swing the AFR wildly with small changes . . . requiring multiple revisions of the aux fuel map alone before you can even consider getting the next ECU tune revision.
The aux fuel map is not complicated . . . it simply uses tables based on MAP vacuum against RPM. We have fallen into a pattern where he sends me the ECU tune, and I adjust the fuel map. That way, I can make multiple revisions of the aux fuel in a short time based on AFR in the logs and not get bogged down for a month going back and forth with him. I just set the 4-port table to where I believe it will be a little rich, then I adjust down until I get to where the AFR is hovering around the magic 11.7-12.2 for most of the RPM range.
Once I see good AFR, I send him the logs for input. Seems to be working so far. The latest tune is at 31 lbs of boost with good AFR. Will probably hold there, or even go back a tune, to be sure I'm haven't exceeded my risk tolerance for the block.
I ended up buying the Bosch injectors and i will get from those what i can and be happy as it's just a daily. And my first project car at that, i will have plenty of others to go balls to the wall, this one i want to learn on with minimal issues and step it up as i go. I see myself getting another FiST down the road and making more bold choices but for my first (and one with my carseats), im going with simplicity. And it's not like 320+whp is a joke.