tooter's manifold adventure...

[4/20 NEVER FORGET]

Originally Posted by tooter

THANK YOU!

No dude, THANK YOU!!! I am so happy you got it running good finally, and that there seems to be a noticeable difference. Looking at the two throttle bodies side by side, you would think there would have to be. The stock TB is so small!

Anyways, this has been a great thread to follow, and I know I can speak for the entire community when I say thanks for posting so often and clearly about the issues and wins you have been having. These threads help us all out. Again, congrats, and I can't wait to see what this sucker does on the dyno. Please post a vid with audio! I bet she screams!

[jetblast]

Staring at pic............................................... .................................................. .................................................. .................................................. .................................................. .................................................. ...........still staring at pic............................................... .................................................. .................................................. .................................................. .......damn nice.............................................. .................................................. .................................................. .................................................. .......still staring.

[tooter]

Originally Posted by 4/20 NEVER FORGET

No dude, THANK YOU!!! I am so happy you got it running good finally, and that there seems to be a noticeable difference. Looking at the two throttle bodies side by side, you would think there would have to be. The stock TB is so small!

Anyways, this has been a great thread to follow, and I know I can speak for the entire community when I say thanks for posting so often and clearly about the issues and wins you have been having. These threads help us all out. Again, congrats, and I can't wait to see what this sucker does on the dyno. Please post a vid with audio! I bet she screams!

Hey man, thanks for the kind words...
From this experience I'm pretty certain that the chips don't even need to be swapped. The butterfly just needs to close farther so that the ECU can find the right idle. Because when I ran both chips, both had the same symptoms. Reducing the idle speed alone is what resolved all of the issues.

So in the future...
If anyone wants to install a part number 030 Corolla 1ZZ throttle body on their 1NZ engine, don't mess with the chips, and simply turn the idle down by backing out the little idle adjustment screw counterclockwise one turn using a 5/64th inch hex key... and everything should work just fine.

I did quite a bit of driving today on the freeway and in traffic with shopping and running errands, and I'm so thoroughly pleased with how well the engine responds with the bigger throttle body.

It behaves like a completely different car!

[JustDidIt]

Originally Posted by tooter

If anyone wants to install a part number 030 Corolla 1ZZ throttle body on their 1NZ engine, don't mess with the chips, and simply turn the idle down by backing out the little idle adjustment screw counterclockwise one turn using a 5/64th inch hex key... and everything should work just fine.

Wonder if this works on my 1NZ-FXE....

[tooter]

Well... maybe.

Although hybrids use an Atkinson cycle engine which is quite different from regular Otto cycle engines. Atkinsons fire once per revolution, whereas Ottos fire once for every two revolutions.

So this means that your ECU likely has totally different running parameters seeing as the engine spins the generator to charge the batteries. That completely different style of intake manifold is the tipoff. It looks like it is made to operate optimally in a very narrow rpm range.

The bolt spacings are:

67mm
71mm
76mm

They'll also need to be in the right orientation and not flipped over. So if the 76.. is on the right and in a vertical position, the top left will be 67mm and the bottom left will be 71mm like this...



See if they match yours.

[Bluevitz-rs]

Originally Posted by tooter

Well... maybe.

Although hybrids use an Atkinson cycle engine which is quite different from regular Otto cycle engines. Atkinsons fire once per revolution, whereas Ottos fire once for every two revolutions.

I think you're confusing it with a 2 stroke. Atkinson cycle is the same as Ottos. The only difference is that Atkinson has a shorter compression stroke than power stroke. On the Prius, this is achieved through intake cam timing and duration. The intake valve is held open much longer allowing some of the intake charge to be pushed back on the compression stroke reducing the energy required to compress the intake charge. This in turn rises the efficiency of the engine by effectively making the power stroke longer extracting more energy.

[tooter]

Originally Posted by Bluevitz-rs

I think you're confusing it with a 2 stroke. Atkinson cycle is the same as Ottos. The only difference is that Atkinson has a shorter compression stroke than power stroke. On the Prius, this is achieved through intake cam timing and duration. The intake valve is held open much longer allowing some of the intake charge to be pushed back on the compression stroke reducing the energy required to compress the intake charge. This in turn rises the efficiency of the engine by effectively making the power stroke longer extracting more energy.

You're right. Hybrid engines acheive the Atkinson effect with valve timing.

Found this by searching How does a Prius hybrid engine work:

"Its engine only runs at an efficient speed and load - In order to reduce emissions, the Prius can accelerate to a speed of about 15 mph (24 kph) before switching on the gasoline engine. The engine only starts once the vehicle has passed a certain speed. And once the engine starts, it operates in a narrow speed band."

The bottom line is that installing a different throttle body on the engine might impair the optimum performance in that very narrowly tuned rpm range.

This explains why they use that weird intake manifold.

[JustDidIt]

Originally Posted by tooter

In order to reduce emissions, the Prius can accelerate to a speed of about 15 mph (24 kph) before switching on the gasoline engine. The engine only starts once the vehicle has passed a certain speed. And once the engine starts, it operates in a narrow speed band."

Currently I have enabled the EV mode hack which is standard on the EU and JDM Gen2 Prius This allows the prius to use the Electric motor only up to 34mph as long as the there isn't much demand for power. If I romp on the gas from the start - during heavy acceleration or hills both the ICE and MG2 move the car along.

Because I use the Torque android app paired thru Bluetooth with the ELM327 to monitor the cars sensors (no OEM tachometer) I can see the ICE running & RPM at all most all times except during stops at lights when the ICE shuts off to conserve gas.

Originally Posted by tooter

The bottom line is that installing a different throttle body on the engine might impair the optimum performance in that very narrowly tuned rpm range.

This explains why they use that weird intake manifold.

If I wanted to maintain the MPG vs HP, i'd prob leave the intake manifold and throttle body as is....but since HP is more what I am looking for with MPG to spare....guess I won't know unless I try. :)