Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

ThrottleBody

Jenga73

New Member
Joined
Aug 5, 2006
Messages
15
Reaction score
0
Points
0
how big is the throttle body on the 3.8L V6??
i can get a 68mm throttle body for $100
reckon its worth it?
 

holden007

VRII
Joined
Dec 18, 2003
Messages
1,104
Reaction score
1
Points
0
Members Ride
Subaru Liberty
For more sensitive pedal and little performance improvement, I reckon its worth it....mines a 75mm and its very sensitive.
 

hakhawk

smooth moderator
Staff member
Joined
Jan 18, 2005
Messages
6,334
Reaction score
118
Points
63
Age
35
Members Ride
BMW E21 320i, E36 "318IS" coupe
vt/vx tb is 65mm from memory, vn-vr are only 60mm.

im assuming youve got a vt or vx, as thats the section you posted in, so i wouldnt spend the 100 on a 3mm bigger tb unless youve already got extractors, cat back exhaust etc.
 

maxbow

New Member
Joined
Feb 10, 2006
Messages
24
Reaction score
2
Points
0
Members Ride
VT Wagon
Go for it!!

One may assume that 3mm is nothing, but if you consider that this is a measurement in diameter, then the increase in volume is considerable.
Surface of a circle ie: area of the pipe/throttle body can be seen as this:
65mm= 331.83mm.(approx)
68mm= 363.16mm.(approx)
This is using the formula Pi(3.14159) x r (radius of circle) squared.
This means that a 68mm TB has 8.63% more area than a 65mm TB, therefore it flows 8.63% more air than the 65mm TB.
I have a 69mm in mine and: 1) It's more responsive
2) It uses more fuel. 3) Shifts are smoother(Don't ask me but they are)
$100 is dirt cheap for a good one and I would *grab it *put it in and *experience the difference. If you don't like it, change it back and sell it to someone else.
Hope this helps, cheers Max.:bang:
 

holden007

VRII
Joined
Dec 18, 2003
Messages
1,104
Reaction score
1
Points
0
Members Ride
Subaru Liberty
maxbow said:
One may assume that 3mm is nothing, but if you consider that this is a measurement in diameter, then the increase in volume is considerable.
Surface of a circle ie: area of the pipe/throttle body can be seen as this:
65mm= 331.83mm.(approx)
68mm= 363.16mm.(approx)
This is using the formula Pi(3.14159) x r (radius of circle) squared.
This means that a 68mm TB has 8.63% more area than a 65mm TB, therefore it flows 8.63% more air than the 65mm TB.
I have a 69mm in mine and: 1) It's more responsive
2) It uses more fuel. 3) Shifts are smoother(Don't ask me but they are)
$100 is dirt cheap for a good one and I would *grab it *put it in and *experience the difference. If you don't like it, change it back and sell it to someone else.
Hope this helps, cheers Max.:bang:

Yep gear shifts are heaps smooth, and YES it uses more fuel.
 

goldencommodore

New Member
Joined
Apr 24, 2006
Messages
72
Reaction score
0
Points
0
Location
gold coast
Members Ride
VT Acclaim Commodore
hey sounds interesting guys.
i have a vt right how would i go about getting my tb to be 68/69mm in size would i go and get it bored out and how would it cost?, or buy an after market? how much would they be?. Also how much more fuel does it use?, but the more fuel usage normaly comes with the nature of the horse power gain.
is it true that u can put a v8 tb on the v6?

cheers.
 

holden007

VRII
Joined
Dec 18, 2003
Messages
1,104
Reaction score
1
Points
0
Members Ride
Subaru Liberty
Mine was a bored out 75mm VR V8 TB, straight bolt on. You can change also the IAC and Throttle Position sensor, as the V8's ones were faulty, I put my original sensors off my 60mm TB and all sweet. Suggest you get new gaskets aswell.

But I have heard the VS-VY, the V8 Body doesnt bolt on to the V6 engine, so double check.
 

sno

New Member
Joined
Dec 9, 2005
Messages
350
Reaction score
0
Points
0
Age
33
Location
NSW
Members Ride
VXII SS
just clean your tb first.. ull notice a smooth and responsive gain.. then decide as the upgrade would be like doing the same again..
 
Top