both turbo and NA use.

what are the benefits one against the other?
with particular reference to the zetec engine.

ive seen a few custom ones with tapered trumpets and the like do these significantly improve flow?

anyone got any good sources of information on inlets and induction?

 

Throttle bodies give you better response,
Full throttle open gives the same power figure as a single throttle plate.

Depends what your using the car for and what management you going to use as you need an ECU with multimap capabilities to change from Map sensor site to TPS site.

Its harder to map multi throttle bodies with a turbo engine for various reasons, the main one is transition between vacume and boost.

It's also harder to have take offs for dump valves etc and serious anti lag is a bit of a mare if you go the jenvey route due to small idle port size.

Haven't got the time to explain at the moment, need more info

My Jenvey style inlet system on my Zetec flows alot more air than before using the Rover 220 set up. Highly recomended

 

You can map individually for each cylinder with the right management IIRC and you can make sure each cylinder gets the right mix of fuel and air rather than putting the correct air fuel mixture in one throttlebody and hoping it all flows evenly into each cylinder

 

Matt-

Can you explain how having 1 throttle per cyl makes the airflow even over 1 throttle per engine?
No, becuase thats impossible, equal airflow if purely down to inlet design.
Infact my own car i habe gone from 6 throttles to a single one mainly as the 6 throttle inlet didnt have very good equal airflow...

Fuel fuel being different per cyl is down to having managment capable of that, not how many throttles you got.

 

Sequential and banked injection have nothing to do with this post.

To be honest if your plenum flows equally accross all 4 primaries, banked is better as it has fuel ready to enter the engine behind the valve between strokes.

Also gives better response over sequential.

Thats what I use on mine

If you can afford the multi throttle setup go with that, you will have to also save up for a decent management system and at least a weeks worth of dyno cell mapping to set it up correctly, if it ever does work correctly.

Most WRC's use Multi plate throttle bodies or roller barrell bodies but they do have million pound budgets to get them mapped.

 

cheers for the info!! if not a little scary lol!!

well put me off any ideas anyway so probably quite good! lol

 

i think multi throttles are the way to go , and may well do , just for experimantal purpose soon , unless someone can convince me other wise ??

 

turbo
one is enough,,, think about how many cylinders and inducting at any one time (one plus a bit of overlap)

NA throttles bodies for me,, no nasty plenums/intercoolers and pipes hanging off them