Micro Image Intake Manifold thread

[Captain Slow]

I can't wait to see somebody post up a dyno chart showing this manifold coupled with I/H/E :D

[mazilla]

Originally Posted by 4/20 NEVER FORGET

My guess is I need to do a chip swap. The car doesn't drive perfect. When I am coasting off of the throttle, say at 30mph (or any mph, doesn't matter), it doesn't matter if I barely touch the throttle or hammer the throttle, the car has a tiny "hiccup" feeling, as if the throttle was partly open then it closed and then opened. It's hard to describe. Also, when I am at partial throttle and I let off the throttle, it hangs for a second or two before closing and starting to decelerate. Is that normal? I know the car did it before, but it is far more pronounced now.

I also had some problems with high idle and idle hang, but I found that adjusting the throttle screw to a higher rpm idle has fixed it. I'm idling pretty high right now, probably around 1000-1200 rpm, but I haven't gotten a check engine light since I adjusted it this way (maybe 10 miles worth of driving where it would happen immediately before) so I think I am just going to leave it for now.

What do you guys think? I thought I had the right throttle body part number, but I'm thinking a chip swap is in my future.

Chip swap won't make a difference, I've been using the 1zz with the same problems, they just don't bother me. I like the idle hang. I get it during shifting(in a stick it's handy!) at high RPM, once in a while it'll be a momentary thing going from 1-2 in a parking lot, releasing the clutch stops it right away. I deal with the issues because of the boost in performance and the adjustable idle. I keep my idle between 900-1000, I absolutely hated the idle drop when the power system had a surge(subs or AC) and was wiling to do most anything to make it stop...I'm happy as a clam.


I do notice however, if I let the ecu(p0505 code) stay on long enough the ecu will adjust the idle on it's own down to about 750 which causes an occasional stall out if I shift into neutral at something like 50-60mph coasting onto an offramp. For that reason I just use my scangauge to clear the code every couple of days when it pops up.


I drive upwards of 400 miles a week in this car.

[4/20 NEVER FORGET]

An update: a bit more tweaking and I've got this 1zz throttle body dialed in. The car drives great now, about 250 miles on the car since install. It takes about 30 seconds for the idle to climb down on cold starts and it's fine after that. I took the car out on some of my favorite roads and the new manifold/throttle body gave it a noticeable power bump, it's especially snappy coming out of tight corners in 2nd and 3rd gear while high in revs.

Overall I'm extremely happy with the upgrade! Thanks again for the advice everyone.

[tooter]

Originally Posted by 4/20 NEVER FORGET

An update: a bit more tweaking and I've got this 1zz throttle body dialed in. The car drives great now, about 250 miles on the car since install. It takes about 30 seconds for the idle to climb down on cold starts and it's fine after that. I took the car out on some of my favorite roads and the new manifold/throttle body gave it a noticeable power bump, it's especially snappy coming out of tight corners in 2nd and 3rd gear while high in revs.

Overall I'm extremely happy with the upgrade! Thanks again for the advice everyone.

I'm happy for you...
The 1ZZ throttle body is one of the best bang for the buck mods you can do because it enhances all of the other mods.

[mazilla]

Originally Posted by 4/20 NEVER FORGET

An update: a bit more tweaking and I've got this 1zz throttle body dialed in. The car drives great now, about 250 miles on the car since install. It takes about 30 seconds for the idle to climb down on cold starts and it's fine after that. I took the car out on some of my favorite roads and the new manifold/throttle body gave it a noticeable power bump, it's especially snappy coming out of tight corners in 2nd and 3rd gear while high in revs.

Overall I'm extremely happy with the upgrade! Thanks again for the advice everyone.

What are you idling at?

[tk-421]

Originally Posted by tooter

I'm happy for you...
The 1ZZ throttle body is one of the best bang for the buck mods you can do because it enhances all of the other mods.

Agreed 100%

Other than the high idle at cold starts (which I'm fine with), I have nothing to complain about. It's been running great for many years, and it did in fact make the rest of my existing performance mods shine even more.

BTW, Did you guys bypass the coolant line on your 1ZZ TBs? I did it since day one with no issues so far. Just wondering if you all did the same...

[cali yaris]

^ That's the free secret mod right there. Not recommended in very cold climates, though.

[Captain Slow]

to be honest I really want the intake manifold...but if I'm going to get it I want the most out of it and that means running a 1ZZ throttle body....but apparently there are some idle issues associated with it.

also I refuse to keep throwing ECU codes, which someone mentioned he does up above and just clears it every few days.

that's a big bummer because I actually traded in a 325i after spending nearly 5K in one year trying to fix an idle issue. I refuse to introduce one to my Yaris.....now I've got more to think about regarding the manifold :(

[tooter]

Originally Posted by Captain Slow

to be honest I really want the intake manifold...but if I'm going to get it I want the most out of it and that means running a 1ZZ throttle body....but apparently there are some idle issues associated with it.

Don't let that misconception get between you and Garm's manifold. There are absolutely no idle issues with a 1ZZ throttle body if you do a couple of simple procedures right from the get go before you install it. At startup and at idle you would never know I'm running a 1ZZ...

...until you step on the gas.

The everyday driveability and throttle response are both superb.

[Captain Slow]

ok, I just REALLY don't want to have to mess with idle issues again.

[mazilla]

If you're happy with the way the car idles stock you'll likely only be dealing with the high idle on cold starts. I wanted to idle at about 1k so the trade off of spending literally 1 second pressing buttons every couple of days is worth it. Remember, for me a couple of days is a couple hundred miles...

[suckerface]

Originally Posted by tk-421

Agreed 100%

Other than the high idle at cold starts (which I'm fine with), I have nothing to complain about. It's been running great for many years, and it did in fact make the rest of my existing performance mods shine even more.

BTW, Did you guys bypass the coolant line on your 1ZZ TBs? I did it since day one with no issues so far. Just wondering if you all did the same...

I bypassed the coolant line on mine, and I live in WI where temps regularly get into single digits for 4-5 months of the year. Zero problems.

[cali yaris]

^ That's good to know.

[tooter]

The coolant hose fittings are oriented differently on the two throttle bodies...



I just jiggered the hoses around until they fit without kinking.

[mazilla]

Originally Posted by TOLMACH

Sorry for a stupid question: Why do you guys need to bypass the coolant lines from the TB?

Just TB preventing the original lines to be used or there is smth else?

I ran out of hose...never got back to it. I could probably do it right now I guess

[4/20 NEVER FORGET]

Originally Posted by mazilla

What are you idling at?

Not sure, I have't installed my tach yet. It's quite low though, I had it where the engine was just starting to shake from the idle being too low, then I turned it back a bit and it's been great ever since.

I did not bypass the coolant line to the throttle body, we get freezing fog and occasional snow here so I didn't want to have to worry about it, so I kept the coolant lines running to the throttle body.

And Captain Slow, I can relate when it comes to worrying about idle issues, I've had idle issues with many cars in the past and they are one of the most annoying things to deal with. Other than the high idle on cold starts, I have absolutely no issues with the car idling now. Hopefully that will ease your mind a little, I wanted to post my issues here so I could get some help and as you can see, it got sorted out. At very least, you could swap back to the stock throttle body and fix any idle issues that may have came from the throttle body swap. From what I gather from the system, the idle is completely controlled by the throttle body, there isn't any bypass valves or seperate sensors on the manitfold that dictate the idle other than the throttle body. So if you were having issues, it'd be an easy fix.

[Captain Slow]

Come on, somebody run to a dyno so we can see what this thing does with some I/H/E mods in place :D

I'd especially love to see the difference between the stock throttle body and the 1ZZ tb.

[4/20 NEVER FORGET]

Originally Posted by Captain Slow

I'd especially love to see the difference between the stock throttle body and the 1ZZ tb.

If you look through tooter's thread, you can see the exact difference a 1ZZ throttle body makes on our cars. I imagine it wouldn't be much different, give or take a HP, depending on stock manifold/tooter/MI intake manifold.

I'll just copy-paste it over actually:

Red: stock manifold + stock 1NZ FE throttle body
Blue: tooter manifold + stock 1NZ FE throttle body
Green: tooter manifold + Corolla 1ZZ FE throttle body



So, 3 HP and 1.5 TQ from the throttle body. Most impressive though are in the top end, how the torque curve stays flatter longer, and the peak horsepower drops off later and slower.

I think the results will be similar regardless of choice of manifold.