Stole these pics from a recent thread by Tony the Tiger. any benefits to a ITB setup with FI in theory?

 

Damn I've wanted wanted to see that for awhile. I've heard that a single TB is better than a ITB and the 4 butterflies are more restrictive than just one. On GTR's you'll notice that on high HP setups that a normal single throttle body setup is always used.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by egizzle6 &raquo;</TD></TR><TR><TD CLASS="quote">Damn I've wanted wanted to see that for awhile. I've heard that a single TB is better than a ITB and the 4 butterflies are more restrictive than just one. On GTR's you'll notice that on high HP setups that a normal single throttle body setup is always used. </TD></TR></TABLE>

is this true?

 

Damn, you stole my idea,lol. j/k.
If you can get a big enough TB like four 48-52mm TB's with short runners and a good sized plentum (about the sam size as a skunk-2) you should be able to make some really good usable power. Not to mention incredable throttle response.

 

Damn, I wonder how much that manifold and itb's cost

 

ITB's are a disadvantage/ power robbers on FI. Its just more restriction.

 

the stock GTiR seems to work well with them

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by USDMforLife &raquo;</TD></TR><TR><TD CLASS="quote">ITB's are a disadvantage/ power robbers on FI. Its just more restriction.</TD></TR></TABLE>

If it was just a disadvantage on a boosted car, why would Nissan spend extra money to run ITB's on stock skylines and GTi-R's.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by USDMforLife &raquo;</TD></TR><TR><TD CLASS="quote">ITB's are a disadvantage/ power robbers on FI. Its just more restriction.</TD></TR></TABLE>

Why dont you try explaining more indy turbo cars use ITB's on boost.

When F1 was turbo they used ITB's.

If anyone else says it bad I want some proof and an explaination why.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by USDMforLife &raquo;</TD></TR><TR><TD CLASS="quote">ITB's are a disadvantage/ power robbers on FI. Its just more restriction.</TD></TR></TABLE>

got proof?

 

Notice how many tuned skylines and GTiR's no longer have ITB's. One of the first mods is to get rid of them and go to a single large TB.

jeff

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bloodline &raquo;</TD></TR><TR><TD CLASS="quote">Notice how many tuned skylines and GTiR's no longer have ITB's. One of the first mods is to get rid of them and go to a single large TB.

jeff</TD></TR></TABLE>

Supras mostly go Single turbo conversion even though upgraded twins make as much or more hp with lots more tq and a flalter band. and no need for nitrous like with the singles. my point is that people dont always think about effciency when they do upgrades cost may be another factor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bloodline &raquo;</TD></TR><TR><TD CLASS="quote">Notice how many tuned skylines and GTiR's no longer have ITB's. One of the first mods is to get rid of them and go to a single large TB.

jeff</TD></TR></TABLE>

Cause there factory units there a member on here who owns a skyline I think from what I remember they werent very good.

 

The skyline unit had a maf.
Because there was no map it used MAF = sucks for reading boost.
The new skyline's dont have it probably to keep cost down now I imagine that to be expensive.

I can't wait for TODA k20 ITB unit to come out theres a k20 map sensor on the runner perfect for reading boost.

Sorry for the 56k rape picture.

 

ITB's work great on NA cars and road race turbo cars. On drag oriented high power FI cars, they just add turbulence to the airstream, and you will not make power over a properly designed intake mani/Single TB. ITBs will give superior throttle/transient response, but less overall pwoer, since you can not tune the plenum to an appropriate helmholtz freq

as usual, its just a tradeoff game

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Full-Race Geoff &raquo;</TD></TR><TR><TD CLASS="quote">ITB's work great on NA cars and road race turbo cars. On drag oriented high power FI cars, they just add turbulence to the airstream, and you will not make power over a properly designed intake mani/Single TB. ITBs will give superior throttle/transient response, but less overall pwoer, since you can not tune the plenum to an appropriate helmholtz freq

as usual, its just a tradeoff game</TD></TR></TABLE>

The 1600hp F1 turbos cars were not high power?

Convince me somemore and I will buy your k20/k24 manfold.

I think corky bell said something about ITB's also anyone have that book?

 

I have maximum boost on page 75 is wher ehe talkes about throttle bodies. but what he says pertains to single. he basically says bigger flows more for more power but at the expense of low end reponse basically stuff we already know.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic &raquo;</TD></TR><TR><TD CLASS="quote">

The 1600hp F1 turbos cars were not high power?

Convince me somemore and I will buy your k20/k24 manfold.

I think corky bell said something about ITB's also anyone have that book?</TD></TR></TABLE>


thats true but, honda drag cars use single tb's and they can afford anything.

 

interesting info... makes you think!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostage &raquo;</TD></TR><TR><TD CLASS="quote">

got proof?</TD></TR></TABLE>


Yes, mathematics.

 

Well heres cosworth 1000bhp F1 turbo engine.








Modified by MidShipCivic at 6:19 PM 9/17/2004

 

Look @ this ultima GTR with chevy motor it has ITB's twin turbo and makes 1300bhp and capable of 245mph.

Why not single plenum?





More here.
http://www.spectrum5racing.com/news.htm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic &raquo;</TD></TR><TR><TD CLASS="quote">Look @ this ultima GTR with chevy motor it has ITB's twin turbo and makes 1300bhp and capable of 245mph.

Why not single plenum?
</TD></TR></TABLE>

Probably because they are road race applications? Like Geoff said, its a trade off. Maybe they could have made more power going single TB but went with the ITB's for throttle response?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by USDMforLife &raquo;</TD></TR><TR><TD CLASS="quote">


Yes, mathematics. </TD></TR></TABLE>

are u sure u didnt mean physics if you have no proof and just want to talk out of your ***. at least make sense.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostage &raquo;</TD></TR><TR><TD CLASS="quote">

are u sure u didnt mean physics if you have no proof and just want to talk out of your ***. at least make sense.</TD></TR></TABLE>

physics is math