2ZR Turbo Yaris

[06YarisRS]

More updates...

So, I was out datalogging today. I'll review those in a bit.

I have almost erradicated my stumble at part throttle at around 3100 rpm. I have been adding fuel to the cells which are highlighted when the car bucks. I still have one small buck to eliminate. Fortunately we have a good stretch of highway with hills, but it's still a challenge to drive, hold rpm and edit the table simultaneously. I don't really have anyone that could either drive - the way I need the car driven - or that could make the changes in the software. I'm going out again this afternoon, to kill - I hope - once and for all, the last stumble. It is a tricky process as when you make a change in one cell, the stumble might suddenly shift to the area represented by another cell (aka, different rpm and load). My fuel table looks crazy with fuel added and in many cells and radical shifts from once cell to the adjacent ones, so I'll be closely monitoring my AFRs to be sure I don't have any dangerous lean spots. I don't expect to as all I've been doing is adding fuel. AFRs where I've made the changes look good. That said, I'm going to confirm this with turbokits and my tuner before I go blasting around in boost.

The best news...I think...

For the first time today, I was driving around with my window open. As I enter boost, I can hear air hissing from the driver's side quarter panel. As the boost increases (and maxes at around 4 psi), the hissing gets louder, then my BOV releases when I come off the throttle. I HAVE ANOTHER BOOST LEAK! I think, or a vacuum line leak that's not keeping the BOV fully shut under boost. This is looking very promising. If I get this fixed (I'm still in the process of adding clamps to vacuum lines and will recheck all my T-clamps, I expect I'll see my full boost.

I will say that the car is positively nasty already at 4 psi. It pulls very hard and the wheel(s) (just one as I have no LSD) wants to spin at speeds over 30 - 40, km/h when it downshifts in boost, and I'm on a hill for example. I did, for the first time enter moderate boost (maybe 3 psi, moderate given my current max boost) in 2nd gear and it chirped the tires shifting to 3rd. I was really surprised. Honestly, I'm quite afraid of what this car will be capable of at 8 psi.