1NR-FE Engine tunes-mods-etc.

[miiser]

Originally Posted by 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.

Hi mate,

It seems that you have made quite a lot of research for this particular engine. And as you said, the engine (for my taste at least) it's a lump. It's not the horsepower, because 101 hp for this small car is good, but it's the acceleration and the torque that are reaaaally disappointing. 13 pounds of torque is not even enough to overtake a lorry safely... meanwhile cars like vw with the 1.2 tsi-tfsi are flying if you compare them with us...

Anyway, I have a 6-speed manual tranny so I won't face any kind of problems that cvts might have. But I am not planning to turbocharge my car. It was just an hypothetical thought.

I don't want my car to be loud. I want it to be functional. So I am considering to replace only my exhaust header (and not the whole exhaust section) to give a little extra breath combined with the less restrictive air filter I ordered. I think that it will help what's your opinion?

Also about the 1zz throttle swap. Is it really worth it? And I didn't quite get the modification I have to do.



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