So for quite a while I've had my scalars around the 1.4 range. Never really had any problems I knew of. The typical HPFP pressure crashes from time to time and always just above the misfire limit of 700psi.
Late last year I was having more and more pressure drop. Everyone normally attributes this to a failing pump. I wasn't ready to throw in the towel on it. When things fail for me they absolutely fail. Not just go limp a a narrow point.
I'd tuned the car for E50, which I can get at the pump. But when I travel outside my little area I have to play the mixing game, which I don't. I just put E85 in and don't lean on it too much; rely on the stft's to do their job and take care of it. 9 out of 10 times it'll throw a mixture control code, expected. But really I'd though I left enough overhead in the tune that it shouldn't. So I got to thinking, maybe that scalar is playing some part.
So today I changed the target afr to match closer to my scalar x afr. Then knocked the scalar down to 1.25.
To my surprise the car feels better and pressure has come up, dipped down to 6xx for just a split second then jumped to 1,200+ for the rest of the RPM. Right now I'm on almost a full tank of pump E85 (didn't measure actual content).
So something worked here.
My initial thought is that the scalar actually has a hard limit of 1.3. Which would be the 30% limit of STFT's. So a 1.25 would leave me a 5% overhead now.
Has anyone else found something similar? Or am I just dumb and should have known about the scalar limitations.
Late last year I was having more and more pressure drop. Everyone normally attributes this to a failing pump. I wasn't ready to throw in the towel on it. When things fail for me they absolutely fail. Not just go limp a a narrow point.
I'd tuned the car for E50, which I can get at the pump. But when I travel outside my little area I have to play the mixing game, which I don't. I just put E85 in and don't lean on it too much; rely on the stft's to do their job and take care of it. 9 out of 10 times it'll throw a mixture control code, expected. But really I'd though I left enough overhead in the tune that it shouldn't. So I got to thinking, maybe that scalar is playing some part.
So today I changed the target afr to match closer to my scalar x afr. Then knocked the scalar down to 1.25.
To my surprise the car feels better and pressure has come up, dipped down to 6xx for just a split second then jumped to 1,200+ for the rest of the RPM. Right now I'm on almost a full tank of pump E85 (didn't measure actual content).
So something worked here.
My initial thought is that the scalar actually has a hard limit of 1.3. Which would be the 30% limit of STFT's. So a 1.25 would leave me a 5% overhead now.
Has anyone else found something similar? Or am I just dumb and should have known about the scalar limitations.