Ok, guys. The ONLY reason I am bringing up the ISR mod is because after searching and reading, I know HOW to do it, WHY to do it, but I am curious about real-life experiences with it. So, those of you who have done this, what's your opinion about it? Does it really add HP, or just the "vroom" factor? Again, this isn't about HOW to do it. But I really respect the opinions of those who have real-world knowledge of this stuff. (Plus, I'm a little afraid of asking over at TTORA. I'm a noob over there, and the guys who have been around don't have a lot of patience with "noob" questions). So how about it? Opinions, comments, and tirades welcome.

 

A bit better throttle response, louder, and no change in gas mileage. Definitely a vroom factor thing.

Easily reversible. Give it a shot and see what you think.

 

bump. Gonna do it, but still curious...

 

I only have good things to said about it, when I did mine, I did it with the deckplate and elbow removal mod all togheter.
All the 3 mods, made a big improvement in performance.

 

There is a con I just thought of...it wakes my wife up on long trips when I put my foot in it.

 

 

Yeup, what Christian said!

Do the deckplate at the same time and get extra vrrrrrrroooooooooom!

 

I am assuming that the reason you can't do the deck plate mod on the 3.0 is the shape of the air box correct?

 

Yeah, but a couple of people have tried various things, including just drilling a bunch of holes in it.

 

I have the airaid mit but same idea. With an exhaust I dont notice that much of a sound difference, though it does seem more mellow and smoother than before. What I like about it most is how much it cleans up the engine bay and with all those intake boxes out of the way, you dont really need to remove the intake to change your plugs or anything.

 

Ok, I did it! Sounds awesome, and there really is a noticable difference in the "get up and go". I did the deckplate last week, and so I can tell the difference between just having the deckplate AND the ISR. I went ahead and went with MOR4WD's write up, and I like it. I like the idea of not messing too much with the vacuums, just putting breather filters on the end. And you're right, the bay does look a LOT neater. Oh yeah, and vroom factor is serious bling, YO! (Seriously, good stuff.) Thanks for all your helpful comments!

 

Id just throw this in here, but, last week I went to my "Yoda", who is a specialist for Toyota trucks. He owns his own garage here, and is realllllllly knowlageable for all years of Toyotas.

Anyways, I was talking to him about the ISR mod and he said that I should put back my boxes. He made a good point about Toyota spending lots of money in technology to develop a good intake system, and why the boxes were there in the first place.

Basically you have waves of air-flow to your engine. The boxes basically take the waves and smooth them out, and thus create a smoother engine.

Of course this is just one persons opinion.

My opinion is that its was cool and stuff, but, I dont know if I noticed any power gains or sound difference. The one thing I noticed is the LOUD WHISTLE noise when cruising.

Im most likely oging to take it out, but, im too interested other things right now

 

Thanks for the comments SC4runner, I appreciate them. The cool thing about the ISR is that it's pretty easy to reverse if you want to. I'll run it for a while, and see what I think. Thanks again for the input.

 

Yeup, the boxes do that, and they also silence the airflow by creating non-resonant chambers, and (if you've got one) it's said that the "J-tube" gives moisture a place to collect so that it can evaporate without being dragged through the engine.

The downside of all the boxes is that they add volume to the air intake system as a whole. When you jump on the gas, all that volume has to fill up before the air gets to the throttle body and on into the engine. That takes time, and causes a lag in throttle response. Removing the boxes reduces the amount of volume, thus allowing for a quicker response.


It's a push/pull thing... You'll need to decide for yourself which way you like to run.

 

I ended up leaving the "p" trap, and just removing the silencer and the PCV box. I sealed the holes and inserted breather filters into the ends of the vacuum hoses that originally ran from the boxes. It is louder, but the throttle is much more responsive. I figure the silencer boxes are not as mechanically important as the water trap. Just my observations. There are those who have a valid point that why would Toyota go to all the trouble of R&D if it wasn't necessary, but then they're trying to find the optimum balance among comfort, economy, and performance. Sometimes one (or more) of those has to give place to the other. Isn't the ISR mod just about tipping the scales in favor of performance at the slight expense of comfort? Just my two cents...

 

If you put breathers on all the vacuum lines, what did you do with the FPR line? That is the hose I would be most concerned with from a performance perspective. Just curious.

 

Wow... yeah. And the coldstart powersteering feed.

There's a reason for those vacuum feeds CJ.

 

Hey Mark, how much do you know about this line? I knew it went down to the PS and had something to do with it, but I was never sure exactly what.

In summary?

 

Christian, please forgive my ignorance of what the FPR line is, but what I did is basically what mor4wd did on his. His write-up is at www.mor4wd.com . I saw that both lines from the larger box in front, and the smaller in back were intakes. All they do is suck air in, right? What he did, (and I) was to just put breather filters on those two lines, the larger hose in back of the intake, and the smaller one that comes out just under the throttle linkage. The engine runs just as smooth as it ever did, just with a slightly louder intake. I don't have any pictures, but go to mor4wd's website and look under "modifications". It's under "PCV bypass and silencer removal".

 

Ok, I looked again, and they aren't intake hoses, they actually return the PCV gasses back into the intake. After reading his write-up, what he wrote made sense, and that's why I followed the route he took. What do you guys think?