bigger throttle body

[washingtonrulz]

i have a vy ss ute, with a mafless tune, it makes 247 at the wheels
is it worth putting a bigger throttle body on and what more power would it make?

 

[GMMAD]

bigger TB wont really give you more power
maybe 5kw
but does give better throttle response

 

[OnionbulbR8]

just to add

i have a vy ss ute, with a mafless tune, it makes 247 at the wheels
is it worth putting a bigger throttle body on and what more power would it make?

Just to add to your question rather than start a new thread, What Size, Brand, Etc do people recommend when upgrading the TB????

 

[GMMAD]

im running a ported and polished TB
if you want a after market one look at a 80mm
but i carnt justify the price per hp gain

 

[Statesmad]

When asking about a tune, I was told not to bother with a polished TB,
that the polish was more for show than flow. He recommended a billet TB.
I have a "Australian Throttle Bodies", 80 mm billet TB. :smoking:
It's bored oversize, polished, has an adjustable TPS locator, had 1/2 shaft removed,
coolant by-pass and opens to 89 degrees (adjustable).
So... In other words, all that can be done to it has been.
I cant tell what the TB alone did, because a OTR and mafless tune went with it....
but, every little bit helps... :beer chug:
But I do know that unless I want to upgrade manifold,
injectors and another TB, I cant do any more.
For Now... :driving:

One upside to a polished factory TB: it will fit...,
standard engine covers may not fit over
the new LARGER billet TB you have just bought...,
"you may need to install risers, either side covers or
:hmmm: "just" cut a hole in your cover to accommodate said new TB. :hmmm:"

But the respect that shinny TB gives is worth it

 

[tigass]

Sorry for the stupid question....but...if I have a stock vt ss series ii what size throttle body should I be looking at upgrading?

 

[Sphinx]

stock one is 78mm, there's a few places that make 84mm. There's a 92mm but that's best matched to a 92mm intake manifold though.

 

[tigass]

So is it really worthwhile upgrading to a bigger throttle?

 

[vt1538]

So is it really worthwhile upgrading to a bigger throttle?

Not really. The upgrade is only wothwhile if your stock TB is becoming a restriction.
I would be either going the ported standard TB or spending my money elsewhere.
Stock is 76mm, the hsv TB is 78mm.

 

[tigass]

now to ask another stupid question. how do you know if the TB is becoming a restriction?