Vortec 80mm conversion

[Defcon92]

Well guys I was looking in the junkyards and found a vortec throttle body off a 4.3l blazer. I saw it looked simple enough to convert to my highout put. Its 80mm necking to 75mm at the throttle blade & ending at 72mm at the bottom.
I the found a write up for adapting it to a renix, which can be seen here.
http://www.cherokeetalk.com/forum/f64/t ... 70mm-6236/
This thing is huge, probably too much in most people's opinion for any naturally aspirated stroker. However I like the snappy, neck breaking throttle feeling.

The few issues we'll hit is, iac, tps, throttle cable & physically mounting the beast.
The iac sensor was actually a direct swap. I used the pentle cap off the Vortec tb as it was larger which was also stated in the write up.
Now my questions are about the tps sensor. The vortec tb uses are thicker larger rod with a flat spot ground in. The HO tb has a 2mm thick skinny rod. My fix for this is to cut down the stock vortec rod so it matches the stock HO rod.

However my new issue is the tps sensor will NOT bolt on which I'm trying to overcome. And I'm currently unsure how to do this... Any suggestions?
The only other solution I'm seeing is adapt the vortec tps to the xj?
Here's the issue. The HO tps sensor is a little to narrow for the Vortec tb. The holes are very close but not perfect.




Xj vs vortec tps


Throttle body size difference. The Vortec one is HUGE.


72mm vortec vs 55mm stock blew the tb blade.


The last issue I'm gonna run into is how to connect the HO xj throttle cable to the Vortec tb. However this is also easily overcome.. I'll provide pictures of it as well when I complete the swap.


And obviously an adapter will need to be made which will be easy..probably just a 1" thick piece of aluminum. Flush mounted screws in the stock location, and studs for the Vortec tb to sit on. The intake manifold will also be opened up to 72mm, there's plenty of room for that without effecting the stock 4 mounting bolts as well. So essentially a 72mm opening.

[SilverXJ]

I would research it a bit and see you could use the Vortec TPS with the Jeep system. Might just need to splice a different connector in.

[Defcon92]

Pm Jon aka 5-90 on a seperate forum. Will probably talk to cruiser as well but I believe it possible. Both run 4 wires. If no can that'll make things easier for the tps setup.

[Jim K in PA]

The TPS is just a potentiometer. Find out what the voltage range output is for each and then you will know if they are interchangeable electrically (0-1,v, 1-5v, etc.). If they are, then you just need to match the ground, V+ in and V+ out to the Jeep harness from the GM TPS.

[SilverXJ]

The TPS is just a potentiometer. Find out what the voltage range output is for each and then you will know if they are interchangeable electrically (0-1,v, 1-5v, etc.). If they are, then you just need to match the ground, V+ in and V+ out to the Jeep harness from the GM TPS.

This. Or just compare them on a bench for resistance first. If the resistance of each goes in the same direction it should work as long as the values are close enough.

Both run 4 wires.

3 wires unless its a renix.

[Defcon92]

The TPS is just a potentiometer. Find out what the voltage range output is for each and then you will know if they are interchangeable electrically (0-1,v, 1-5v, etc.). If they are, then you just need to match the ground, V+ in and V+ out to the Jeep harness from the GM TPS.

This. Or just compare them on a bench for resistance first. If the resistance of each goes in the same direction it should work as long as the values are close enough.

Both run 4 wires.

3 wires unless its a renix.

Yup 3 wire lol.