Converting to Fox TB setup...??

94GTLaserRC said:

Was considering this, since I will be doing a longblock if I keep the car... I can eliminate the elbow, and in the meantime, get one of those BLINGY VORTECH discharge tubes.

What all do I need to do and/or consider if I purchase a Longblock setup with a Fox TB in mind?

Can I get the Accufab polished TB if I do this?

Thanks
RC

Click to expand...

I have been debating this as well.... Yes on the TB as long as it is for a fox of course!!
If you are still running smog, you will need a little more work as the EGR valve would be in a different location.... There is a write-up on this in the FAQ about Cobras/GT's/GTS's...its a sticky on this forum...
16. Converting to a FOX style throttle body
by GTJake

How To Convert To a Fox Style Throttle Body

First you need to gather the swap parts. The easiest way is to find someone that is parting out an 87-93 Fox body or just go to the junkyard. You can also find a lot of these parts on Ford Cown Vics, Lincoln Mark VIII’s and 5.0 Cougars and T-Birds.

Here’s the parts you need:

• Fox throttle Body
• Fox EGR delete plate or EGR spacer
-EGR delete plate (http://uprproducts.com/shopping/shopexd.asp?id=383)
• Fox Throttle Cable Bracket
• Fox Throttle Cable
• Fox TPS connector
-Get both ends of the TPS connector if you want to be able to unclip the TPS easily.
• Fox IAC

Here’s a pic of all the parts needed. Thanks for all the pics RIO5.0 (Andy)!



*Most of these procedures are described in good detail in a Haynes manual, but I’ll do my best.*


First thing you need to do is take out the stock throttle cable. Get under the dash and look up at the top of the gas pedal and you’ll see that the throttle cable is just pinched into place into the fork on top of the gas pedal. Just take a screw driver and pop that out.

Then look at the firewall where the throttle cable goes in and you’ll see two bolts. Remove those and undo the throttle connections at the SN-95 throttle body. Remove the throttle cable.

Install the fox throttle cable the same way you removed the SN-95 throttle cable. Where it bolts to the firewall you will only be able to use one bolt hole, unless you drill another. I’m using one and there are no problems with it.

Remove the SN-95 throttle body from the upper intake and disconnect the stock TPS and IAC sensors. Remove the elbow adapter.

This is a picture of the throttle cable bracket bolted to an EGR delete spacer.


You can get four studs from the hardware store and screw them into the upper intake. The studs use will vary in length depending on if you’re using an EGR spacer or just the delete plate. They should be ¼”x18thdx. Here’s a pic.


Here you can see how everything hooks up. The throttle cable connects to the throttle body by popping onto the ball on the bottom.


In this pic you can see the TPS sensor. The bottom connector is the part that gets wired to your existing TPS wires.

What you want to do is cut the stock TPS connector off exposing three wires. There should be a gray wire with a red stripe, a gray wire with a white stripe and a brown wire with a white stripe. The fox TPS connector (the bottom connector in the picture) will have three wires also. A green, orange, and black wire. Here’s is how you want to wire them together:

Green wire – Gray w/white stripe
Black wire – Gray w/red stripe
Orange wire – Brown w/white stripe

Use some wire connectors to splice them together and cover them in electrical tape.


Now you’ll want to go ahead a bolt up the IAC sensor which is in this pic. Make sure you use a gasket between it and the throttle body, the stock gasket works fine.


Bolt it up in that same orientation as shown in the pic to the throttle body otherwise it won’t idle. You can use you stock plug from the SN-95, no wires need to be spliced to connect this sensor.

Now put the EGR spacer or EGR delete plate with the throttle cable bracket connected to it on the upper intake. See pic.


Now put the throttle body on. Make sure you’re using gaskets between the upper/EGR spacer/and Throttle body.

Now connect the TPS sensor that you have. It should bolt to the top of the throttle body and have a little connector at the end that will plug into the other connector that you already wired into your existing TPS wires. Here’s a pic of how it should be set up.


Now before you bolt the TPS sensor down to the throttle body you are going to have to check TPS voltage. You can do this with a voltmeter that you can pick up at any auto parts store. A digital one makes it easier. Turn the key on, but don’t have the engine running. Connect the black voltmeter wire to the black wire on the TPS and the red voltmeter wire to the green wire on the TPS. Move the TPS until you get a reading around .985-.989. The TPS moves a little bit on top of the throttle body when it's not fully tightened down. Once you reach your desired TPS voltage (i.e .987) then you tighten the screws down and it locks the TPS in place settting the voltage.
This is just a suggested voltage. There are many opinions on this and you can research for yourself what would be the voltage you would like to use.

Once you get the proper voltage, tighten the TPS down.

Connect the two TPS plugs. Connect the IAC plugs. Bolt the throttle body down. Connect your fox throttle body style intake tract. Make sure you have the IAT sensor in and the MAF plugged in.

Here's what it should look like when your all done.

94GTLaserRC said:

Thanks for the reply...I already have the smog pump and the EGR delete.

Thanks
RC

Click to expand...

It is very simple to do, and I got my throttle cable, cable bracket, cruise control cable, and TPS sensor from a guy on the Corral, all for $30 shipped. I don't remember his name though.

I like it alot. It cleans up the engine bay, gives more valve cover clearance, and does not have that restrictive bend right after the throttle body. To make it work with the SC, I just had to get a piece of 3" pipe about 8-10" long and add a 45* coupler.

What is pids?

In the pic you can see the pipe I had to add. It is muffler pipe and I just haven't painted it yet. I also don't have numbers yet because we had alittle problem on the dyno but it should be done this weekend.

yellowclone said:

It is very simple to do, and I got my throttle cable, cable bracket, cruise control cable, and TPS sensor from a guy on the Corral, all for $30 shipped. I don't remember his name though.

Click to expand...

I got my TPS sensor, Throttle Cable and Throttle cable bracked and IAC from the boneyard.

I picked up my cruise cable from 50resto and it was like 1/2 the price of the dealership for an actual Ford part.

Feel free to PM me if you want any pics or info on the install.

94GTLaserRC said:

What is that big tube-looking thing on the side of the TB??

Click to expand...

That is the IAC (idle air control).

One thing you'll need to do when you get the vortech discharge tube is you're going to have to cut it down- the discharge tube you see in that picture is for a foxbody setup- with the accessories from a fox, which are mounted farther away from the engine. Cutting the tube isn't much of an issue, just make sure you get a reducer coupler because the diameter of the tube will change and will no longer be the same diameter as the discharge on the blower. I'll see if I can post some pics later.

No, he's saying that the Fox discharge tapers down as it nears the outlet on the head unit. It goes from 3" down to whatever size the outlet is. You're pretty much gonna have to cut all of the tapered part off leaving a 3" pipe. You get a reducer and you'll be all set!

Here's a pic of mine with a getto-fabbed disharge tube. I wanna get the Vortech Fox tube, but the one with the mondo bypass mount is pretty expensive!!

The_Mustang said:

No, he's saying that the Fox discharge tapers down as it nears the outlet on the head unit. It goes from 3" down to whatever size the outlet is. You're pretty much gonna have to cut all of the tapered part off leaving a 3" pipe. You get a reducer and you'll be all set!

Here's a pic of mine with a getto-fabbed disharge tube. I wanna get the Vortech Fox tube, but the one with the mondo bypass mount is pretty expensive!!

Click to expand...

What kind of discharge tube is that then? Clean engine....

Red1990Lx said:

What kind of discharge tube is that then? Clean engine....

Click to expand...

That is just a piece of mild steel tubing. Thanks for the clean comment, I do try!

The guy I bought the supercharger kit from had that discharge made up, this is why I went with a Fox throttle body setup because that's all I had to work with.. and I had the parts to do the swap anyway.

RC, it depends if you're running a Race bypass or mondo bypass with your setup, if you're just using to stock plastic bypass then you can use a regular discharge tube.

This is the one I need:


I assume this is the one you want:

the top one will look just like the bottom one when I get through with it, probably better!