Don't worry when you try it. You have to make the ECM think the coolant is around 120F-130F before it limits the RPM and won't shift down. Don't worry about it.
The idle will be the same in a gear, but in Park or N it will raise the more you increase resistance. (turn the knob) You'll know you've turned it too far (and realise how muhc fuel you can add!) when the engine responce goes from a little better to worse.
I'm doing this because I know a million little tricks that might add a hp or a maybe a few for no-very little cost.
I could easily tell anyone that wanted 200hp out of a 3vz-fe to cut a hole in their airbox and go buy a $300 SMT, richen the fuel until the last two vertical rows (where you need to lean on the top half), build a relay(cause the 6 is finiky with ignition signal changes) and advance the timing from 3 points off idle to 8-12 points in high RPM-WOT TPS/AFM/MAF/MAP setting.
It's easy to make 5-20hp for a few hundred bucks. my thing is that most people on Toyota Nation are not willing to spend $400-$500 on upgrades that won't get them 20hp.
I'm trying to give the tight wads some options!
