I need everyones help. Venom intake and Q45 TB

[wickedz]

Yeah I came across a good dsmtuners local pickup deal, so I took it. However im unsure on the TB issue. I would like to keep my OEM 2g TB because of my VRspeed short route kit on its way to my house now. WIth the Q45 90mm TB, I will have to modify a new setup for my piping :-(. Also, the TB dont have a IAC or my TPS, so what would I do about that?. Ugh anyone else running anything like me?

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[tkelly27]

The venom is flanged for a the Q45 I'm assuming. Judging by the 3 wires coming off of it, it looks like the Q45 has a TPS on it, which you can re-wire and use with the DSM ecu. All TPS sensors work similarly.

The next issues you'll need to address are the IC piping, and the throttle cable. I'm unsure about the specifics of the throttle cable, but it should be pretty clear what has to happen when you put the throttle up to the manifold. You will need a 90 degree coupler the size of the throttle and a reducer to the size of your intake piping. I'm pretty sure the Q45 is somewhere in the range of 3.75" on the outside of the throttle nose, and the VRSF is 2.5" OD for the IC piping. a 90* 3.5" to 2.5" reducer would be

Intercooler Pipe Fabrication - Silicone Intake Systems Auto Parts

Bending Reducer
and a short section of 2.5" pipe should be all you really need. Here's my disclaimer, you're the one with these parts, not me, you need to measure to make sure they will fit right.

The easiest way to adapt a 2g throttle body to the Q45 flange that I can think of is to get a 1/4" aluminum plate from your local hardware/remnant metal store, drill 4 holes for the Q45 flange, then 4 holes for the 2G flange, then use a hole saw to drill the central hole. IMO, this is going to be much more expensive.

 

[wickedz]

what about our IAC sensor? Its mainly the sensors that bug me.

 

[tkelly27]

Sorry, I've had those blocked off for so long I forgot the cars actually came with them .

I do not use a FIAV or an IAC on my car. Those aren't sensors but idle control systems. It's a little unfriendly to start when it is cold out, but by the time I'm out of the driveway it's idling ok, and when I'm down to the end of the street the idle is fine. You'll set the idle with a set screw or by tensioning the throttle cable. You can leave the IAC plugged in to keep the computer happy. If you have dsmlink someone with a 2g can probably tell you more about how to keep the check engine light from coming on so you can get through DEQ.

 

[wickedz]

oh so we really don't need the sensor? That is great know because that is a EXPENSIVE sensor to change.

 

[tkelly27]

Only one is a sensor.

The TPS with the wires on the side is needed and you can use the one on the Q45 throttle you pictured. It determines how far into the throttle you are. This helps the ECU with fuel metering. Use a multi-meter and wire the Q45 TPS into the DSM harness. You'll see what it does by using it on the ohm setting and twisting the throttle or look up the wiring diagram online.
http://www.dsmtalk.com/forums/showthread.php?t=216208
I'm sure someone can help you do it to a 2g if it is different.

The FIAV is a valve that causes the idle to increase when the engine is cold. It's a little wax piece that expands and closes a valve as the coolant running through it warms up.

The ISC is the idle speed controller and the ECU uses it to target idle speeds for different reasons. I think it's mostly for automatics as the engine will idle differently in P and N compared to when the engine is working against the torque converter in D and R.

Actually, if I remember correctly, when the 1G IAC goes bad, it can take parts of the ECU with it. It is not only expensive and unnecessary, for my car it is a liability to have it hooked up. Not sure if they fixed that for 2G's, but I doubt it.

They make a block off plate for the 2G that gets rid of the FIAV and ISC, so it's definitely not critical. You do need to loop the coolant lines that normally go to the throttle body when you get rid of it. If you can install a SMIM you can do that. If you have another DSM or a friend who is willing, pull the plug on the ISC and see how it runs. You might not even notice the difference. Adjust the idle with the Base Idle Set Screw if you do notice a big difference.

You can do it, I believe in you!