Throttle bodys on forced induction ?

[retrowrongun]

As title have a set if throttle bodys here and looking to fit them to a turbocharged vehicle
Just curious what's involved anyone on here done it and what's needed ??
Car currently runs a 3bar map sensor would this work or would it require maf instead ?

[slater]

Bit of an open ended question!

What car? What ecu? What throttles? Why?

[retrowrongun]

I'm only interwstwd in the airflow metering side of it tbh.

[slater]

All I can tell you is you won't need a MAS.

[CR500Dom]

Not worth it, you wont gain anything over a single throttle set up

Take it from someone who has designed both systems for the same engine and back to backed them for the manufacturer, there was NO MEASURABLE DIFFERENCE with ITB`s over single throttle on the same engine, same boost, same day, same calibrated engine dyno.

Save your money, simplify your system

The current engine I'm designing has all options open to us, as a clean sheet performance design, it will be boosted

It will have one throttle per bank, not ITB`s

[retrowrongun]

To be honest I'm not fussed about gains it's more the response side of things
Also I like to be different the std inlet manifold on a yb engine is pretty restrictive
I have the throttle bodys and plenum here anyway and looking at it wouldn't take much messing to fit at all

[welshpug]

go for it, quite a few oem setups running itb and boost, pulsar gtir, skyline gtr, lotus did a few, mostly carbed!

[retrowrongun]

Well it's the gtir setup I have from my old gtir and the runners aren't that far away from the std cossy yb inlet

I've seen them retro fitted to c20let engines but don't think anyone's put them on a yb hence I wanna do it tbh

[retrowrongun]

And besides rather than yog well over 1.5k on a roller barrel throttle body setup think this may make a good reasonably cheap alternative

[retrowrongun]

Gratuitous pic of my pulsar

[CR500Dom]

You wont see any measurable gains in throttle response either

[retrowrongun]

I don't care tbh if there's no gains at all although without doubting your expertise I find it hard to believe

Either way I'm not fussed if there's no gains at all
They will still look cool and it's something different on a yb hence I'm still keen to do it

I'd rather some posotive input in terms of what's needed along with fitting them rather than people saying it isn't worth it etc etc

But cheers for me the noise alone will make it worth it tbh

[theheap]

Will the noise be different? From single throttle?

[hario]

MAP is measured upstream of the butterfly in the manifold, and so would IAT, so just mechanical installation really.

The pseudo-science sense in me says a bigger plenum volume is needed to help achieve ideal air balance/distribution. Note, this may be nonsense

[vitesseefi]

ITBs on a normally aspirated engine, especially one with a "big" cam do give worthwhile benefits in throttle response and lower speed/part throttle operation compared to a single TB on a plenum.

On a forced induction engine most of the benefits just vanish (not that you are likely to have a long duration cam on a forced induction engine anyway) and they are unlikely to be worth the inevitable extra aggro.

Nick

[johnd]

Loads of people do itb and plenum set ups on c20lets don't they?

[retrowrongun]

Yeah johnd have seen it done on a vauxhall motor

But never before on a yb hence why I'm so keen as usually it's mountune roller barrel tb setup or jenvey for yb
And I like to be different lol

I have what's supposedly the best inlet plenum for the yb which is the hart
But tbh I think the itb will look better

[CR500Dom]

Feb 21, 2017 20:18:42 GMT retrowrongun said:

I don't care tbh if there's no gains at all although without doubting your expertise I find it hard to believe

Either way I'm not fussed if there's no gains at all
They will still look cool and it's something different on a yb hence I'm still keen to do it

I'd rather some posotive input in terms of what's needed along with fitting them rather than people saying it isn't worth it etc etc

But cheers for me the noise alone will make it worth it tbh

Thats fine, I'd just hate for you to put a load of effort into something only to find out that you've gained nothing.
As for my experience, there are others on here that will vouch for that

I`ll give you a clue, you listed skylines earlier as examples of boosted ITB installations.

Ever wondered why the R35 GTR doesnt have them ? Do you think we didnt look at it, design it and test it ?

Like I say, in my experience you will only achieve an increase in complexity, but you are right it will be different and I look forward to seeing the progress

[retrowrongun]

Not sure I did mention skylines myself dom
Just the GTIR baby Godzilla

But cheers I hear what your saying too but the main factor for me is the fact it's different and not been done on a yb Dom