f1-style injektors on manifold, good idea?

[x6rs]

check this out: http://www.rbracing-rsr.com/bmwK1200.html

thinking about putting the injektors on the plenum and use 5 separate throttle bodies just like the manifold in the link if i make a custom IM...thoughts about that?

[x6rs]

http://www.nsxprime.com/photopost/data/869/ITB_interesting2.jpg

[x6rs]

i think the old f-1 cars with turbo used this application, must have been a reason for it.
but they also put the a throttle body INFRONT of the turbo, did a search on google and found it.
i guess that would make every cylinder get an equal amount of flow and A/F Ratio, what do you guys think? good idea or bad?

check this out: http://www.f1technical.net/forum/vie...php?f=4&t=3012

[JP]

Great for continuous high rpm application allowing sufficient time to properly mix air fuel at high intake air speeds allowing for improved top end power. Complete and utter pig to try idle nicely and run nicely at normal road driven rpm's. As the airspeed is not sufficient to keep the fuel suspended in the airstream causing it to pool on the bottom of the intake manifold.

[quattro84]

Yep, search for upstream injectors as well. A way to gain time for air/fuel to pre-mix before entering combustion chamber with high air speed. I don't even want to think what the outcome would be in case of an engine backfire...
Big downsides when placing the TB in front of the turbo is that any air leakage will lead to strange engine behaviour... like RWD19T says idling could be difficult as well.
It will change the turbo response all over like mentioned in the thread you posted. I recon turbo speed will become an serious issue looking at what happens with turbocharged engines on altitude.

Still i'd encourage you to try it. Would be a nice project. And since you are from Sverige this will work

[x6rs]

the car isnt for daily drive, i got an old volvo to transportate my lazy *** in but i still want to have a decent idle and lower rpms, im not looking for maximum power for the strip,more maximum use-able register and dont want to worry about one cylinder running lean/rich. i want to use it for track and maybe some road aswell, but mainly for the track.
but it would be really cool to do something different if i can make it work troughout the whole register

im also interested in putting a throttle body infront of the turbo in combination with throttle bodies on the intake

one other big issue im thinking of is were to put the intake for the plenum(i hope you understand what i mean, not to good at english )

im thinking that if you blow air in from the side maybe the squirts of fuel wont hit the middle of the "trumpets"? in a N/A engine that wouldnt be a problem, but maybe in turbo engines. what do you think? im just guessing here.

[quattro84]

Yes, stick the injectors far enough into the velocity stacks or 'trumpets'. Otherwise your mixture will be blown into the last cylinder if you make a side feed plenum.
I had that problem on another project for a friend... It showed during the dyno sessions.

This setup wasn´t deep enough but gave the least turbulent airflow: