1NR-FE Engine tunes-mods-etc.

[MugenRep]

miser,

I think I'm the only active guy here who does things with the 1NR-FE.

I have a USDM Toyota iQ with the 1NR-FE and a few modifications.......

1ZZ throttle body modification. As with the 1NZ-FE guys, I melted the adhesive on the adjustment screw and turned 2.5 times (I think it was counter-clockwise). Definitely increased throttle response and the extra mm of air intake I'm sure helped our little pathetic 94-98bhp lump

Gutted out both primary catalytic convertor that's part of header as well as secondary catalytic convertor, which definitely helped with power.

50mm DC Sports exhaust, straight through with only resonator until recently adding Honda Fit HKS axle-back to quiet it down. Definitely allowed for a touch more breathing, but needed more control over fuel and VVT phasing.

CamCon cc-101 VVT-I and A/F controller all set to the specs on the original Power Enterprise website for the 1NZ-FE. It ONLY controls your intake VVT-I, not your exhaust.

Stock gutted iQ airbox with K&N filter and OEM MAF going to custom intake with 3" Outer diameter and 2.7" inner diameter all the way to the 1ZZ TB, all wrapped in DEI laval thermal wrap.


As far as boost goes, you need to be careful as the 1NR-FE has 11.5:1 compression, so colder IK22 plugs with 4-5psi on a custom turbo kit and good tuning are going to be a necessity. Kit would have to be custom as the exhaust manifold doesn't match any other 4 cylinder Toyota and the closest I've found for a manifold is the Suzuki G13B with primaries 2-3 moves slightly.

Also with boost, specifically turbos, they produce substantially more heat, and if your running the K410 or K411 CVT transmission, it's going to overheat substantially, so you're going to want to reduce underhood temps as well as the CVT cooling system or you're going to blow it quickly.