Independent Throttle Body setup for Tii

[dapbmw]

the dbilas itb's are for dcoe style dual side draft manifolds

[peteinjp]

well, if you give each cylinder its own throttle body your bound to feed more air into the cylinders than sharing one common plenum.

But my common plenum feeds the stock tii all it can draw in. The single theottle body itself can be enlarged if need be. Most well built ITB's share a common plenum for tuning. Plenum runners can be extrude honed to get larger diameter. So there must be something about placement of the throttle plates relative to the cylinder?

[TJW]

Why not use a S14 intake

[DB]

Why not use a S14 intake

as per my post http://www.bmw2002faq.com/component/option,com_forum/Itemid,50/page,viewtopic/t,285859/

[TJW]

The s14 intake will also take the Kugel and fisher injectors, nay problem.

[dapbmw]

We can supply you with a DBilas intake manifold, 2 it'b's pre-drilled for Tii injectors and the linkages for the itb's, but you have to make the linkage from the itb's to the Kugelfischer pump. Some guys have done it already. DBilas itb's are better coz they are shorter than all other itb's out there and you can use those red Alpina velocity stacks or the DBilas air box  with enough clearance as long as you have a Tii brake booster.  

[zinz]

whoa... Dave dusts one off from the archives.

 

JimK ? how'd your WOT tests eventually turn out?

 

Ed Z

[NickVyse]

Just bought these babies - they use the stock tii throttle linkage. Injectors mount underneath.

 

[Lee]

These are very, very nice.

[NickVyse]

Thanks Lee - ever seen them before? Friend John Hudson thought they might be of South African origin, but no one really knows and there are no markings on them. They're 40mm BTW. 

[Lee]

Never saw them with the injectors underneath as a 4 injectors TB. Injectors being positioned underneath usually is for set-up comprising of 8 injectors.

 

BTW 40mm throats is actually big. They are like 45mm TBs with 40mm chokes.

 

BTW I was in your neck of the wood this past Spring. I bought a motorcycle in Northern France and then rode for 10 weeks/20,000km to Morocco, back to France, Corsica, Sicily, Tunisia, back to Italy, the Balkans, Belgium, then went to the Nurburgring etc. I was in Grenoble (where I used to live) and spent several days around Aix-en-Provence, Cannes, hills of Nice and Monte Carlo at friends' place. I love Southern France, off season. ;-)

 

And I completely forgot you had your little resort up in the mountains... Damn it. Next time.

[NickVyse]

that's a hell of a bike ride! Throttles are currently on a 2.23L

 

 

[NickVyse]

My neighbour has these great looking throttles for kugel - brand ETA, never heard of them, but have dubbed them estimated time of arrival. 

[TobyB]

PDQ, I suspect, if you tune them right!

 

heh

 

t

 

[COOP]

On 2/9/2007 at 8:34 AM, peteinjp said:

So exactly what is it that is gained by having independent TB's. Is it just about less restriction. Why is it that a common plenum single throttle body is said to produce more torque?

 

From speaking with many people a lot smarter and more experienced than I over the years, the short answer I've been given is: Next to NOTHING is gained on a tii by just going from the stock plenum to ITBs...unless you count the neat, whooshing intake sound and the also neat sound of oohs & aahs from fellow enthusiasts when you open your hood at shows. 

 

People forget that the stock tii plenum is a tuned chamber, sized optimally to provide just the right amount of air. It is an extremely effective and efficient solution, devised by the best engineering minds of the day working for a world class company. 

 

Now...throw in cams, extensive cylinder head work, injectors, and most importantly, revised fuel pump calibration (you're adding more air so you need more fuel), etc...and THEN you're talking. But I wouldn't expect much in the way of added performance from ITBs alone, other than the possible exception of marginally better throttle response. 

 

COOP