2ZR Turbo Yaris

[06YarisRS]

Originally Posted by tmontague

I would recommend just taking an air hammer or cutoff wheel to the flat part of the subframe touching the pipe from the turbo (then repaint).

That part isn't very sructural and is mostly just left over from when the steel is stamped. That is the part of the subframe I air hammered on mine to better clear the transmission to make it easier to remove and re install.

Good work so far, this is coming along nicely

Thanks! I will do this as you recommend, however, it's the upper rounded corner section of the sub frame that the hose of hitting. It's actually not touching the stamped steel lip, but it might when the engine torques, so, yes, I will do as you recommend. The challenge will clearing the upper forward part of the subframe. It's likely going to require some combination of couplers. I'll try to get a better pic of what I'm describing.

My other issue is that I have very little room for an air filter. The smallest filter that even stands a chance of fitting between the turbo and frame/firewall has a flow rate of 283 CFM (K&N RU-2420). The filter that comes with the kit (K&N RU-3700) is rated at 380 CFM. According to various CFM for boost calculators, I'd be close to - if not slightly over the limit with the 283 CFM filter at 0.55 bar (~8 psi). I'll post a link to a couple calculators below. So, this brings me to the question of which approach to take. I'd love the have a large filter positioned where the stock airbox goes for a few reasons: colder air, larger CFM and less chance of filter loading from road debris resulting in reduced filter flow rate. But, obviously that necessitates an extensive custom intake set up which is both expensive and complicated to install.

My target is about 7 psi boost, so I could probably get away with the smaller filter attached to the turbo, but I think it's less than Ideal. I'd rather a larger filter, honestly.

Calculator 1:

https://www.boosttown.com/forced_ind...calculator.php

I used the following variables:

Engine RPM: 6000
Engine Size: 1800
VE: 90 (I'm guessing as I couldn't find any info on the VE of the 2ZR N/A)
Boost: 0.55


Calculator 2:

https://www.widman.biz/English/Calculators/CFM.html

I used the following variables:

Engine Size (cc): 1800
RPM: 6000
VE:1.55 (drop down te VE menu and select, "Enter a specific value)