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Discussion Starter #1
First off does anyone here know of a place/person to have a TB bored out.

Second, I've heard of people going 68 and 70mm. Any reccomendations?

Third where would I find the larger TB plate. I remember reading that people used a Holley plate but I thought I also read that it was disscontinued.
 

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CaptainMorgan said:
First off does anyone here know of a place/person to have a TB bored out.

Second, I've heard of people going 68 and 70mm. Any reccomendations?

Third where would I find the larger TB plate. I remember reading that people used a Holley plate but I thought I also read that it was disscontinued.
There is a place right by me that is doing my "new" TB.
They ported my LIM as well. It looks great.
For the plate, you will need to get Holley p/n: 26-130 (70mm TB plate)
I was able to get one a couple of weeks ago, even though they are out of production. Expect to pay ~ $20 for it. You can try Summit Racing, or Jegs.

I would expect to pay ~ $100 for the port job on the TB. The factory plate is 68mm. You CAN go up to 72mm, however, you will need to fabricate the throttle plate. You can use the original as a template. That will drive the cost up, but you will have a one off piece.
 

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Discussion Starter #4
Alright so go 70mm with the holley plate.

That brings me to another question Tom, I'm guessing that you have an extra TB being bored out, so you wanna sell me your current one when you're done with it so I can do the same?

I've decided that I'm going to bite the bullet and do this at the same time as the intake spacer. We were talking about cleaning the tb anyways, so bolting on a new one will barely take any more time.
 

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CaptainMorgan said:
Alright so go 70mm with the holley plate.

That brings me to another question Tom, I'm guessing that you have an extra TB being bored out, so you wanna sell me your current one when you're done with it so I can do the same?

I've decided that I'm going to bite the bullet and do this at the same time as the intake spacer. We were talking about cleaning the tb anyways, so bolting on a new one will barely take any more time.

I have one better...
I will be selling my original 70mm TB once my new one is done.
It isn't the prettiest one on the block..but it has propelled the car to its current 15.01 et. I need to wait until I get my stuff back from the machine shop. If you want it, it is yours.

Lemme know.

One other thing....if you are going this route, get either a Nitrile Rubber, or a Silicone 90* elbow to replace the restrictive factory elbow. You won't go wrong with this...
 

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shadowvox6 said:
One other thing....if you are going this route, get either a Nitrile Rubber, or a Silicone 90* elbow to replace the restrictive factory elbow. You won't go wrong with this...
To be honest I tested a nitrile 90 degree bend, a factory bend ported out and a non-ported factory TB connector with my intake setups and got the same exact track times with both OEM TB and ported

I also had a past customer dyno his car with the ported bend and the OEM unported and it came back exactly the same

Bottom line, all the nitrile proved to do is make the install a pain in the butt, no power gains shown
 

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Discussion Starter #9 (Edited)
I do have Joe's intake with the boed out TB bend already.

Tom that sound sweet, I am all over that deal. One thing, what do you mean by not the prettiest on the block? (I have a feeling that I really won't care, just curious).

I guess I should ask how much you want for it.
 

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CaptainMorgan said:
I do have Joe's intake with the bored out TB bend already.

Tom that sound sweet, I am all over that deal. One thing, what do you mean by not the prettiest on the block? (I have a feeling that I really won't care, just curious).

I guess I should ask how much you want for it.
Look at the photos on this page:

http://www.cardomain.com/ride/461264/2

It is fully functional...
Prolly $100 - ish??

I think you will like the driveability.
 

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JoeKD said:
To be honest I tested a nitrile 90 degree bend, a factory bend ported out and a non-ported factory TB connector with my intake setups and got the same exact track times with both OEM TB and ported

I also had a past customer dyno his car with the ported bend and the OEM unported and it came back exactly the same

Bottom line, all the nitrile proved to do is make the install a pain in the butt, no power gains shown
That maybe true, but it didn't hurt anything.
It also depends on other factors...
Was the exhaust system opened up?
The factory looks as if it is restricted compared to an open elbow.

Just my $.02 worth...your mileage may vary!!
 

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Discussion Starter #12
It looks good to me, and ~100 sounds good too. I figure we don't need to waste money on shipping, we'll just put it on when we do the spacer install.
 

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JoeKD said:
He used the breather filter so that he wouldn't have to connect the PCV line to the intake pipe
That is correct....
The plenum get enough oil in it.....don't need anymore!!
 

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shadowvox6 said:
That maybe true, but it didn't hurt anything.
It also depends on other factors...
Was the exhaust system opened up?
The factory looks as if it is restricted compared to an open elbow.

Just my $.02 worth...your mileage may vary!!
At first glance it does look restrictive but the TB is going to narrow the opening anyway, right? It just seems to me like it would be better to have a gradual decrease in diameter, allowing the air to speed up, instead of some of it hitting a wall at the IAC and creating turbulence right there at the TB opening. :dunno: I'm surprised the factory piece isn't the better of the two - but I won't argue w/a good dyno run ...
 

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Discussion Starter #18
I would imagine its not as easy to bore out a TB with a gradual decrease in diameter, but you're right about how it's surprising that the factory piece isn't better.
 

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I was talking about the gradual decrease in the stock rubber elbow just before the TB. The stock unit narrows the opening gradually through the curve to go around the IAC but provides a small, horizontal slit to let air into it. Some of Joe's elbows were cut out in front of the IAC to make the end opening (toward the TB) bigger. But that also puts the IAC, with it's very small opening, in the main intake path so the air coming around the curve in the cutout section hits what is mostly a wall of aluminum. I suspect the cutout may not effect things as bad as I had foreseen because it's on the inside of the curve ...
 

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shadowvox6 said:
You CAN go up to 72mm, however, you will need to fabricate the throttle plate. You can use the original as a template. That will drive the cost up, but you will have a one off piece.
Curious - I have read about the rubber elbow mounting flange getting kind of thin when boring to 70mm. Probability of collapsing if you tighten the clamp down too much? So what happens if you go +2 to 72mm - does that flange have enough material left to secure the elbow to?

Also what about turning down the TPS mounting screws so that you can cock it to one side. Any benefit

I haven't looked into this boring stuff much, but is there any interference at the plastic upper manifold TB mounting flange - what shape is its opening?
One of the reasons I ask these questions is to decide how big can you go? 76mm?
 
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