Ebay 92 and 102mm throttle bodies...
01-22-2011, 09:09 PM
#21
The pictured throttle body looks as if it is a FAST TB. All these "mods" you are trying to do will do nothing but hurt you.
Do not drill a hole in the blade, there isnt one there on purpose. There is a screw that lets you adust throttle blade idel postion, so you can set your IAC right where you want it. A hole is non adjustable and perminant....
Dont "half shaft" or knife edge the blade #1. Airflow hates sharp edges and loses flow, think of a cylinder head on a flow bench...it flows 30cfm less without a nice radius.
Dont "half shaft" or knife edge the blade #2. A 102mm TB will flow more air than your engine could ever use, doing these stupid gimmick mods will only give you the chance to perminatly screw it up, with nothing possible to gain, leave it alone. Ive worked on a twin tubo 632ci and it used a 102mm TB.
The "hump" in the bottom is to help control airflow at low throttle postion. Think about how much larger of an area your opening up. 5% of a 75mm TB is much less than 5% of 102mm. So the "hump" stop air from flowing past the bottom of the throttle blade, and only lets it go by the top. Leave it alone also, this is one of the big difference between a quality TB and a cheap one.
Do not drill a hole in the blade, there isnt one there on purpose. There is a screw that lets you adust throttle blade idel postion, so you can set your IAC right where you want it. A hole is non adjustable and perminant....
Dont "half shaft" or knife edge the blade #1. Airflow hates sharp edges and loses flow, think of a cylinder head on a flow bench...it flows 30cfm less without a nice radius.
Dont "half shaft" or knife edge the blade #2. A 102mm TB will flow more air than your engine could ever use, doing these stupid gimmick mods will only give you the chance to perminatly screw it up, with nothing possible to gain, leave it alone. Ive worked on a twin tubo 632ci and it used a 102mm TB.
The "hump" in the bottom is to help control airflow at low throttle postion. Think about how much larger of an area your opening up. 5% of a 75mm TB is much less than 5% of 102mm. So the "hump" stop air from flowing past the bottom of the throttle blade, and only lets it go by the top. Leave it alone also, this is one of the big difference between a quality TB and a cheap one.
01-22-2011, 09:41 PM
#23
as stated above, the hump is there to make light throttle inputs more progressive. If you remove it, like in a stock throttle body, it makes the car very jumpy and harder to control, or maintain a constant low speed. dont remove it! I also would NOT mess with the throttle blade or shaft, the shaft is 2 sided for a reason, that blade is HUGE and rapid slamming closed of the blades will bend the shaft and break screws if you take half of it away
01-22-2011, 09:58 PM
#24
The pictured throttle body looks as if it is a FAST TB. All these "mods" you are trying to do will do nothing but hurt you.
Do not drill a hole in the blade, there isnt one there on purpose. There is a screw that lets you adust throttle blade idel postion, so you can set your IAC right where you want it. A hole is non adjustable and perminant....
Dont "half shaft" or knife edge the blade #1. Airflow hates sharp edges and loses flow, think of a cylinder head on a flow bench...it flows 30cfm less without a nice radius.
Dont "half shaft" or knife edge the blade #2. A 102mm TB will flow more air than your engine could ever use, doing these stupid gimmick mods will only give you the chance to perminatly screw it up, with nothing possible to gain, leave it alone. Ive worked on a twin tubo 632ci and it used a 102mm TB.
The "hump" in the bottom is to help control airflow at low throttle postion. Think about how much larger of an area your opening up. 5% of a 75mm TB is much less than 5% of 102mm. So the "hump" stop air from flowing past the bottom of the throttle blade, and only lets it go by the top. Leave it alone also, this is one of the big difference between a quality TB and a cheap one.
Do not drill a hole in the blade, there isnt one there on purpose. There is a screw that lets you adust throttle blade idel postion, so you can set your IAC right where you want it. A hole is non adjustable and perminant....
Dont "half shaft" or knife edge the blade #1. Airflow hates sharp edges and loses flow, think of a cylinder head on a flow bench...it flows 30cfm less without a nice radius.
Dont "half shaft" or knife edge the blade #2. A 102mm TB will flow more air than your engine could ever use, doing these stupid gimmick mods will only give you the chance to perminatly screw it up, with nothing possible to gain, leave it alone. Ive worked on a twin tubo 632ci and it used a 102mm TB.
The "hump" in the bottom is to help control airflow at low throttle postion. Think about how much larger of an area your opening up. 5% of a 75mm TB is much less than 5% of 102mm. So the "hump" stop air from flowing past the bottom of the throttle blade, and only lets it go by the top. Leave it alone also, this is one of the big difference between a quality TB and a cheap one.
I figured out the no hole in the TB as well... I'm used to stock TB's
but again thanks for the confirmationas stated above, the hump is there to make light throttle inputs more progressive. If you remove it, like in a stock throttle body, it makes the car very jumpy and harder to control, or maintain a constant low speed. dont remove it! I also would NOT mess with the throttle blade or shaft, the shaft is 2 sided for a reason, that blade is HUGE and rapid slamming closed of the blades will bend the shaft and break screws if you take half of it away
I'll take a good look again at the situation and see what I think.. I'm not going to mess anything up, so if I feel it is sketchy I will abandon the project..
01-22-2011, 10:15 PM
#25
stock is a different story, a car i work on runs a 105mm TB and it has half shaft style attachment, so Im just talking from experience. We had a small backfire one day and it bent the blade a little and twisted the shaft as well. I made a double sided shaft for it and a thicker blade and havent had any problems, even with a much larger nitrous backfire late last year when the motor let go
01-28-2011, 08:31 AM
#39
I posted up a thread about ebay throttle bodies a while back and didn't get many responses. Glad someone took the plunge! Now if you install it and get it to idle I'd buy one too. Something about spending $300 for a TB mades me a little nauseous.
As for stolen design, I mean it's a cable driven 102mm throttle body. Most LS1 throttle bodies are going to be pretty much the same thing, just different sizes.
As for stolen design, I mean it's a cable driven 102mm throttle body. Most LS1 throttle bodies are going to be pretty much the same thing, just different sizes.
