Guaging Interest Excessive Manufacturing Intake Plenum GB

[J. Fast]

so a 70MM opening is an option?

Are you wanting a 70mm TB? Why not go with the Q45, it's a wee over 80mm(3" ID)?

Is the q45 tb plug and play as far as the throttle cable and sensors are concerned?

So I get this much, the q45 only fits on the plenum...but as far as working with the electronics of the car, the TPS, IAC, coolant lines that go to the stock TB, all of that is DIY? T

Q45 throttle body has FIAV plumbing for coolant lines. Also has the same reference and operation as the DSM retrofit which is a 3 wire power, signal, and ground. The TPS is calibrated quite easily. It's not like it's a huge DIY project or anything. It would be the same as calibrating a new TPS and rewiring an IAC. If you have a flash ECU, or Standalone the setup is even easier because you can modify the reference for the TPS, IAC, and FIAV in the software. To convert to a Q45 takes about 30 minutes. My Rally North America Co-Driver, Hal wrote the book on the q45 TB integration for DSM community at Tuners and RMDSM. If you guys get stuck I can help you out.

The IAC wiring to convert is as follows...

Function	3000gt TB	Infinity Q45
Idle Switch	Yellow/Red	-----
TPS Output	Brown/Red	White
Ground	Black	Black
5V	Green/Yellow	Red

*The idle switch wire on our TPS is not needed to convert to the Q45. It can be cut and capped.

Instructions to calibrate the throttle body fast idle (FIAV) from Hal...

Here are my instructions that I posted back in 2009, it assumes a DSMLink setup but the mechanical aspects are the same, regardless of EMS

As delivered, it'll need a couple of turns in on the phillips head screw to get the car to start, catch, and run on it's own.

---

All three screws work in unison.

The phillips head actually sets the cold (fast idle), the upper is the fast idle let off, and the lower is the warm idle.

Here's how I do it:

Run the car to normal operating temp.

Calibrate TPS to get a raw of 30.

Now, with the car cold, set the upper screw 1/2 way out and adjust the phillips screw to give a TPS raw of 32

From this point it's a matter of adjusting the phillips screw to give you the correct cold idle (say 1200), the upper screw to decrease the idle as it warms up and the lower screw to give the proper warm idle.

Make sure the idle speed setting in the client is as close as possible to the actual warm idle speed.

Once you get the idle speeds and let off point where you want them, then revisit the tps calibration.

Hopefully that answers the questions regarding the TB calibration and component transfer. The FIAV is a (3) screw adjustment and requires a meter or a logger, the wiring for the 3/S to Q45 IAC has been given, and the TPS modules transfer straight across. That's it.

[Streamln1]

So just judging by the pics the surge tank is about 50% bigger than stock, so what gains can be expected? I do like the idea of a larger throttle body. How about the ISC?

[mb3000]

Ninja has you covered:
Ninja Performance Remote IAC/ISC Block (NPRemoteIAC) - Ninja Performance - Affordable Performance

[CoopKill]

New info is up on first post for dimensions, new tb flanges made, and lower plenum port/polish.

[Streamln1]

In for more info on the benefits of a larger surge tank. Im on the fence if I want to jump on this, but maybe.

[familyMAN]

You should add in the volume of one runner also to the plenum volume. Most shoot for 1.5x engine displacement or greater. Some of the evo manis are approaching 2.5x displacement. Not always practical because of space constraints.

I would like to see the design with shortened runners. Somewhere in the 11" range from intake valve to plenum.

[J. Fast]

In for more info on the benefits of a larger surge tank. Im on the fence if I want to jump on this, but maybe.

One benefit is greater reserve capacity avail to the runners. Another benefit is the removing the restriction at the throttle body. A 90mm TB passes significantly more air than a 60mm one. If you're pushing the boost past 25psi the reserve capacity in the plenum is a huge benefit. Last but not least... the sound . A bigger tank really sounds cool when you get some resonance off the engine and you wind it up.

[Streamln1]

I was sold at the sound, lol.

[familyMAN]

Posted in wrong intake mani thread so I will ask here also....did he say how much shorter he can make the NA runners without interfering with engine? Access to rear plugs without removing mani?

[CoopKill]

I checked the clearance on the NA mani, and no spacer needed as is with mine.

The plug access as I mentioned before will not happen without shorter runners. As a guess I would say minimum of 3" shorter would be needed for plug access.

TT runners are 11 inches, NA runners are 9 inches. 9" is the shortest length you can have without a spacer. The top of the rear valve cover gets in the way of the tank.



Runner profile as requested.