ITB's on a 2.2 SR20de T

[EfiOz]

Instant animal throttle response and a bucket load of mid range if you pay careful attention to the inlet length. 10 out of 10 WRC cars can't be wrong.

Supashake, what do you mean "Even Ferrari have dumped Multi throttle bodys now"?!? Lemme guess. The new F2007 has gone to a single Edelbrock 85mm instead?

[Supashake]

355 had 8 throttles,360 has 2 one per plenum.
We are doing a custom single per plenum setup on an MX5 I fitted an F355 motor and box into the rear off.Yes i did fit the running gear from a 355 into an MX5 and its passed its engineer tests.

[PLAYA]

picsorban

[Supashake]

I have a few before the test that look bad cause we could not paint or do much detail till the flex test and inspection.
The car was on hold for 3 years but is now on the go again,It drives with all the mechanicals working exept for the gear shift.Gears change but very poor shift as I used MR2 parts but just found genuine Ferrari shift mechanism.
The screen and doors are MX5 but every other body panal is custom, front is sortof NSX, rear is a little bit like a GT40 with no roof. Ill take photos when the body shop has the shape close.

[oldcorollas]

but ferrari is NA....

perhaps Ferrari dropped the multis to save a bit more cost shaping up for the new season...

[Madhatr]

FWIW the BMW F1 turbo engine originally used a single butterfly, in front of the turbo. The low-revs driveability was very poor though due to the large volume of inlet track to fill, so they eventually added a butterfly to each inlet runner so five in total.
Some photos here -> http://www.gurneyflap.com/bmwturbof1engine.html

GTSBoy has the right answer though.

They originally carried over slide throttles on the earlier engines, difficult to see them in the turbo pics, but if you see the NA motors, they really stick out.

[Calibrator]

Well being the kind who has to try everything for himself I am fitting a set of locally developed 48mm throttle bodies on. I fitted a set of these in 45mm to a N/A SR20DE which made pretty good power despite having a crap exh header and small butterflys.
These bolt straight onto the head without the need for a manifold.
The brake fluid reservoir will have have to be relocated and I will have to custom make some airhorns and a plenum as the stock airhorns are too long to fit inside a plenum.
Just got the engine bits back from the engineers on Friday so now I can get started.