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different throttle body?

C

CSVT2000

CEG'er
Joined
Oct 9, 2008
Messages
98
Location
Darlington WI
i did the throttle body optimization process last night and i noticed that the pictures in the how to were a little different than the one i have. the one in the directions show the throttle body shaft as being half moon shaped but the shaft in my throttle body is a full circle with a slot in the middle for the butterfly plate to go through. I dont know if i just missed something in the how to or if i have a slightly different throttle body than in the how to. let me know what you think.
 
Normally you cut off the part of the shaft that goes over the front side of the butterfly, thats called halfshafting. Then you put countersunk screws into the butterfly.
 
ok...i see. the how to said nothing about that so i thought maybe the how to was for an SE tb and the svt one is different.
 
CSVT2000 said:
ok...i see. the how to said nothing about that so i thought maybe the how to was for an SE tb and the svt one is different.
Click to expand...

Nope both are the same....i have a great how-to i just can't find the cable to my camera so i can get the pictures i took off :mad::mad:
 
thanks for the info...its greatly appriciated. the differance in throttle response is amazing. i'm really glad i did this mod. so if the throttle bodies are the same then why do they put and svt sticker on it? just to make you feel good i suppose.
 
CSVT2000 said:
thanks for the info...its greatly appriciated. the differance in throttle response is amazing. i'm really glad i did this mod. so if the throttle bodies are the same then why do they put and svt sticker on it? just to make you feel good i suppose.
Click to expand...

They are not the same....i meant the process of Optimizing the tb is.
The svt tb and the 3.0L tb is the same size 60mm
The se tb is 55mm :)

Good job on finishing your tb. Glad everything is working well :)
 
Harrry said:
They are not the same....i meant the process of Optimizing the tb is.
The svt tb and the 3.0L tb is the same size 60mm
The se tb is 55mm :)

Good job on finishing your tb. Glad everything is working well :)
Click to expand...

ok...ic. i guess i understood that too. thanks for the help.
 
I'd like a how to also, I can't find the old one. My biggest issue is how the heck do you get a nice clean "halfshafing" job without some sort of machine to get it exact? There is no way in hell my hand would be that steady.
 
CSVT2000 said:
ok...ic. i guess i understood that too. thanks for the help.
Click to expand...

What most people don't know is the svt tb is 65mm but with the shaft in the center with the plate it drops down to a 60mm. That is why when you remove half the shaft you increase the tb to a 62.2mm. :)

The svt UIM opening is measured at 66.8mm :)

I just wanted to clear some things up...on the public forum so others know differences.
 
ScottyDsntKnow said:
I'd like a how to also, I can't find the old one. My biggest issue is how the heck do you get a nice clean "halfshafing" job without some sort of machine to get it exact? There is no way in hell my hand would be that steady.
Click to expand...

I ordered a camera dock....so once that thing gets here and i get the pictures off my camera. I'll have the how-to up very soon. Plus it has tons of detailed pictures. So there won't be any confusion on what to do.

I'll also finish my SE tb Opt also. I'm going to try to get every tb done so others don't get confused or lost later on down the road. :)
 
Harrry said:
What most people don't know is the svt tb is 65mm but with the shaft in the center with the plate it drops down to a 60mm. That is why when you remove half the shaft you increase the tb to a 62.2mm. :)

The svt UIM opening is measured at 66.8mm :)

I just wanted to clear some things up...on the public forum so others know differences.
Click to expand...

I really don't think that is correct. You are probably measuring the throttle body at one end or the other. The bore needs to be measured at its narrowest point, very likely where the throttle plate is.

I do agree that you get more flow from half-shafting, but doing so does not magically make the bore larger.
 
Big Jim said:
I really don't think that is correct. You are probably measuring the throttle body at one end or the other. The bore needs to be measured at its narrowest point, very likely where the throttle plate is.

I do agree that you get more flow from half-shafting, but doing so does not magically make the bore larger.
Click to expand...

The bore does not change what so ever. The area of flow is changing. The measurments taken from such items..... every thing is measured from the exit area. Example the Maf..from the exit area...the TB is measured the same way :)
 
Big Jim said:
I'm certain that the measurement is a diameter, not flow. Flow is expressed in CFM, not millimeters. The diameter they measure must be the narrowest spot.
Click to expand...

The most narrowest spot is after the tb plate which ='s 65mm. Which is the same as the exit point of the TB.

Yes flow is measured in CFM (cubic feet per minute). But you need the MM to calculate into cubic feet. Just CFMS are widely used and are less in numbers........like if you did use mm it would be like xxxxxxxxx cMM/s compared to just a few numbers like 236cfms. :)

The svt tb has a surface area of 60mm. The diameter is 65mm. So there for when you do the halfshaft modification you increase the surface area to 62.2mm. The diameter of the actual housing is constant. So it never changes...your only changing the surface area.

I have 4 tbs sitting here right now...if you wish i can take pictures with measurements from the front to the back to the middle if you wish.


Just remember your 70mm Mass Air Flow meter.....is not measured from the smallest point. If that was the case it would be like 56.XXmm. So they don't measure it from the smallest point. Not trying to be rude...I just want to make you understand how They (not me) Calculate these parts. This is also another reason why i say a 65mm maf is a good upgrade over the stock one.
 
Your math is funny.

The surface area of a 60 mm throttle plate would be A=3.14R or area equals pi (3.1415926) times the radius. That works out to 94.2 square mm (30 x 3.14).

Now if your are trying to subtract out the area of the throttle shaft and the cross section of the throttle plate that isn't going to be much. Then add back in what gets removed when you optimize the throttle body (sharpen the edge of the throttle plate and remove half of the shaft), and that still isn't much. I would need to measure the diameter of the throttle shaft and the thickness of the throttle plate to actually see the difference.
 
Big Jim said:
Now if your are trying to subtract out the area of the throttle shaft and the cross section of the throttle plate that isn't going to be much. Then add back in what gets removed when you optimize the throttle body (sharpen the edge of the throttle plate and remove half of the shaft), and that still isn't much. I would need to measure the diameter of the throttle shaft and the thickness of the throttle plate to actually see the difference.
Click to expand...


The surface area of the tb which has the shaft and plate is 60mm The throttle body itself is a 65mm. That means 5mm of space is taken up by the shaft and plate. You remove one shaft and you leave the plate you cut that 5mm in half and then half the plate. So 62.2mm is the shaft removed and the plate and other half of shaft present.
 
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