E30M3

While you're at it...why not add some individual TBs for a hair more go and better throttle response?... Below is a view of those used on a 6 cylinder M3. The first M3 and the present (E46) use Individual TBs, but not the E36 US model.


http://www.dtmpower.net/wallpaper/images/t...ottlebodies.jpg

Stan

jerrypeterson

A vendor is already researching this option, but it will be quite some time off. Head work or internals would really make ITB's shine, but its a chicken before the egg sort of thing.

Shamu

What kind of filter would be needed to protect the engine if we go with with ITBs?

cjb80

A filter for ITB's is usually a spongy type of material that goes over all of the trumpets (?)

E30M3

>>>A filter for ITB's is usually a spongy type of material that goes over all of the trumpets <<<

That's one way. Lots of hot air to breathe though, so some folks run a hose to dump cold air in the vicinity.

A better way might be to add a plenum fed by a large duct which then allows the use of more conventional air filtration. This is what BMW does on the M cars.

Individual TBs would help the S2K whether head work was done or not. Slight output increase and noticeably better/faster throttle response would result if well designed.

Here are some pics...the big red box thing is the plenum:

http://www.m3bmw.com/yourm3/rob_servidio-06.jpg

Cool, a racing SLIDE throttle...no thottle plates to block the air:

http://www.m3bmw.com/gallery/e30m3-engine/eng248.jpg

The plenum covers the trumpets and attaches to the flange...the diameter and length of the trumpets is v. important...the trumpets live in the plenum and sadly are hidden from view:

http://www.e30m3therealm3.com/gallery/e30m.../venturi2-1.jpg


Stan