Anyone ever tried it or does anyone have any input into this?

Would an I.T.B setup work on a turbo 16V engine?Would you get much or
of a gain?

I asked this question a while ago. The conclusions where:

- it would be expensive. TBs, inlet, plenum etc..
- you would see 'some' gains, unsure exactly what though.
- I doubt there are any off the shelf fitments so custom work needed
- Larger single TB would work better (look at big skylines etc)
- its gonna be hard to balance each TB

And last but not least

- it would look really cool.............

its not always expensive or even that difficult, you could use one from another car like a pulsar Gtir, you would need to make an adapter plate but nothing to difficult, i only have one sitting in my workshop as well

they have a single shaft for all four throttle plates so no need to worry about adjusting them

And also i have a 650+bhp skyline and its still using the individual throttle boddies that come as standard, they work fine upto 1000bhp as well, much more and they start to restrict flow but a single throttle body does have worse throttle response, pulsar throttle boddies are good for 500bhp quite easily

Ricky

Did you see mine you could do something similar http://img.photobucket.com/albums/v74/sediciRich/IMG_1616.jpg , just need to get an air box made which can take the pressure, actually that would be the only difference - the air box. Use Guy Croft DCOE manifold to DCOE fit throttles, sort out the air box with a few take offs for MAPm dump valve, waste gate supply. Or use DCOE manifold, add injector bosses- weld on air box back plate to manifold (cut out for ports of course) add/weld trumpets, then finish off air box and clamp together with big old single plate on the side. Simple.

Back plate sort of like this

http://images.google.co.uk/imgres?imgurl...%3Doff%26sa%3DN

this is the 8 injector box that clamps onto that back plate above (but not with those throttles which could be head side of the back plate) http://images.google.co.uk/imgres?imgurl...%3Doff%26sa%3DN

this guy here has the same approach I said dcoe manifold to 2 part air box and single throtte with trumpets
http://www.vauxhallsportforum.com/phpBB2/400bhp-cav-4x4-turns-to-rwd-t127.html

rich

Rich

Very interesting reading and viewing there Sedici.

I spoke to my engine builder this morning aboit I.T.B setup on my 147 turbo engine build,but he rekons the best and easiest solution is a bigger alloy plenum chamber with either a 60mm or 65mm throttlebody on it.


ITB setup runs well on a N/A engine build.but..............
That in order to get ITB,s to work and run smoothly on a turbo engine is alot of hassle and messing for not that much gain,when compared to a bigger/less restrictive alloy plenum chamber and throttlebody setup.

Just wondering if anyone had done it woth a Coupe 16v turbo,so thats why I posted the thread.

sure no problem, I think that vauxhall thread is good to see a custom made manifold using not too much aside from cutting welding and a starting point. If nothing else it looks nice.

rich

This lot would be able to make you custom inlet

http://www.boggbros.co.uk

Hmmm.... shiny engine bits....

Has anyone done it since the last post??

this is what i have on my brothers celica gt4 track car
http://i1129.photobucket.com/albums/m508/louieuk/st185/IMG_0320.jpg
90mm throttle body off a nissan

ITB's are a bit pointless on a turbo, I mean, think about all the good reasons for using them on an n/a application then try to apply the same reasons to a turbo and you will see they conflict.

There is one good reason I can think of whereby spraying an outboard injector onto the throttle plate helps mixture homeogenity.

One integrale tuner I know uses ITB's, not convinced its worthwile myself.

Any advantage at WOT? Particularly with barrel or slide throttles, as used in many high-end race applications?

Good point about barrels and slides, more than likely no benefit there.

No need, no gain, no point :-)

Just something else to go wrong and having a variable influence on air flow and all that involves into the engine seems to my mind to be daft. Looks smart though eh!

put that money into a bigger turbo, everything else is going to net you not alot,
and you will just be fiddling at the end of the day i think
just my thoughts

http://www.pistonheads.com/gassing/topic.asp?h=0&f=47&t=776108&mid=0&i=0&nmt=My+Lancia+Delta+Integrale+Project%2E&mid=0

http://www.pistonheads.com/gassing/topic.asp?h=0&f=47&t=776108&mid=0&i=60&nmt=My+Lancia+Delta+Integrale+Project%2E&mid=0


intergrale on ferrari bodies

do someone tried again this solution?

There is a factory set that exists for this. Dellorto made injector throttle bodies for a while after the end of the carb era and I had a set. Not sure what car they were on if any but they had stamped on them RA3 or RA4 I think and they had Fiat group pattern cylinder head ports rather than your normal DRLA/IDF style pattern, also with the injector slot as per the inlet. I tried them on an Alfa 155 of a mate of mine probably 15 years ago. They had a TPS sensor on one.

They were also available on the very late Alfa Boxer-style engines that were also Fuel injected (I guess Alfa 146?) also made by Dellorto but I think the inlet diameter was smaller - I also had a set of them, which I acquired at the same time and I recently ebayed.