Question: ITBs on TURBO CARS?
 

I searched around and I wanted an HMT opinion on this. Why don't people use ITBs for their turbo cars? wont it still give a better responsiveness than the conventional far-away-single-throttle setup? Reason being I've seen some really nice custom plenum setups being made on here and i was wondering why not just weld a set of ITBs and velocity stacks to those runners? In addition to faster response it should be better at equalizing the amount of air each cylinder gets doesn't it?

Thanks guys.

Re: Question: ITBs on TURBO CARS?
 

IMO its just extra $$$ and headache that doesn't need to be spent on something that already works well.

generally speaking... a single throttle body per multiple cylinders will produce a more responsive vacuum signal rather than its ITB counter part. The crisper vacuum signal increases the accuracy at which low speed fuel and ignition can be calibrated at in bottom of the power band, which is more suited toward an average bottom dollar street car.
Fuel efficiency doesn't make big power, the ITB style will generally exhibit a lower flow loss ..which is more suitable for maximum power. And injector placement/multiple inj. is another can of worms.

despite that i was planing on adding ITB's to my turbo setup in the near future after madd amounts of head work for cool/performance factor with plenty of chrome. all in while dicking around with the runner and plenum size to see what would best compliment my power band.

There was a AE86 running around somewhere with a boosted/ITB setup, im sure some google digging might bring something up.
Some stuff on SoS's web page make me believe there might even be a boosted/ITB NSX out there
http://www.scienceofspeed.com/produc...rottle_bodies/

Re: Question: ITBs on TURBO CARS?
 

id say another reason is that it might be a headache to tune but im not 100% sure that would be true since I am no tuner. another reason is id say most of us are lazy and for the 20 or so horse we would get from it we would rather get some beer with the money, or buy a manual boost controller and up the boost for $15 and get beer with the rest of the money

but imo i would love to see itb boost and sometime in the future i might do it.

Re: Question: ITBs on TURBO CARS?
 

Be a man and crank the boost controller. :6
That kind of throttle response is damn near a moot point when you have turbo lag/boost threshold to worry about.
With the right intake manifold, equal cylinder distribution isnt a problem.
Im not really up on the whole ITB theory but it seems to me that 3 more TB's is just 3 more restrictions in my intake. Someone please correct me if im wrong.

Re: Question: ITBs on TURBO CARS?
 

The ITB's on corolla would be a mere issue of finding a silver or blacktop intake manifold on bolting it on. For 86's you'd just have to put the plenum opening on the other side since the points to the firewall if left normally. A couple of stock turbo'd cars come with an ITB setup....all Sklyline GTR's, Pulsar GTI-R's, and ummm....ummmm well I guess Nissan like the idea of ITB on boosted car moreso then other car manufacturers. Alot of it is for throttle response. THough when going for big HP numbers then people usually toss it and go with a single throttle body. Getting a single bored out throttle body is cheaper then say boring out 4 or 6 runners of a intake manifold.

Re: Question: ITBs on TURBO CARS?
 

good points, good points...

Re: Question: ITBs on TURBO CARS?
 

"tony the tiger" over on honda-tech used an itb setup on the last of his set-up I saw on his dc2. He had a pretty sneeky set-up at the time i'll see if I can find some pictures.

Re: Question: ITBs on TURBO CARS?
 

i'll do you one better. pics and video

http://www.honda-tech.com/zerothread?id=1665480

Re: Question: ITBs on TURBO CARS?
 

A cop here would have no idea what to think if he opened that bay.

Re: Question: ITBs on TURBO CARS?
 

i didnt really read the responses....but wouldnt the advantages of an itb setup be negated by boxing it all up in a plenum anyway in order to attach a charge pipe? i would think that would basically just make it a more complicated stock-style manifold