I was reading about the euro BMW and how some have a throttle body for each cylinder and got to thinking.......What if this was done to a TPI setup. I was thinking that you could accomplish this by using the runners off the accel superram and slapping (maybe?) a throttle body from a v6 on each runner then linking the "banks" of throttle bodies with a rod then linking both "banks" of throttle bodies with another rod then connecting the accelerator cable somewhere on the contraption so that every throttle body opened at the same time. I'm thinking the setup would have to be driven by a '730 ECM as using a MAF setup would (I think) defeat the purpose of the multiple TBs because it would not feed the "big" plenum/filter box that would sit on top of the TBs.

Now you ask..."and if you were to make it and it worked how would you get filtered air to the TBs?".....Well to solve that problem I thought that a cowl induction hood would work real nice and it would allow for a decent sized box to sit atop the TBs and would allow for a decent sized filter to be used, thus allowing ample air to be available to each TB.

Well I don't really know to much about how things work of that much of the BMW system that spawned this idea so I have no earthly idea if it would work or be worth the effort. Thus the reason I'm asking for your opinions

Thanks

 

If you could find small enough throttle bodies, you had the skill to wire up the complex linkage, and you managed to get everything calibrated equally, if you were really really lucky, when it was all said and done, it might work half as well as 1 throttle body does, at least until something broke, which of course would be 8x as likely as with the stock setup.

 

That sounds kinda like the old 3 carb deals of years passed. I have seen some of the high dollar custom fuel injected engines at car shows running individual TBs. I don't know how well they run. Personally I think it would be fun to mess around with, if time, money, and resources were not a major concern. You know, if you have some decent shop equipment, a car that you don't need to get around in everyday, and maybe a hook up for parts. 8 TBs can't be cheap.

I bet if it was setup right, it would scream...Just getting there would be lot of work. Oh, about the filtering, a small air filter above each TB would work.
I just remembered! Have you seen the new Viper that Dodge is playing with. Its some concept race Viper. Anyway, it uses a similar idea but it has 10 cyl. They have a custom air cleaner box that draws in cool air through a scoop in the hood.

 

Why???

Go get a monoblade. Problems solved, to the tune of 1300+cfm.

 

"Why?" you ask...............based on the very well known principle that drives human nature, the same principle that drives some to beef up 305s instead of getting a 350, the same principle that drives some to drop a big block in instead of getting a 383...........................

to take on a challenge.

and

to be different

It's just that simple......

 

OK, to take on a challenge. Sure, thats a noble endeavor.

The thing is, such a set-up will require a lot of skilled custom fabrication, and for no real gain. No offense, but if you possessed 1/10 the knowledge and resources it would take to execute the idea, then you woulnd't even be asking the question in the first place.

AAMOF, such set-ups already exist. Not sure if they've all been custom, but i've seen V8s with individual TBs for each cylinder in a few different configurations. I've especially seen old school style hildebrand (sp?) stack mechanical injection looking set-ups that were converted to EFI so many times that i'd bet a dollar you can hand someone money for one.

And thats not even counting some DOHC V8s that used secondary throttle plates to close off the second intake valve at low RPMs / low power mode. Such as the ZR1 vette and IIRC the DOHC cobra mustang. Yet another style of individual throttle body.

 

I fail to see how having the machanical know-how to accomplish something automatically gives you an understanding of how efficient the the thing you want to make will be.
For example I could build a ram air setup and know that it will increase the performance BUT that doesn't mean I know by how much my performance would increase or if it was even enough to worrent the ram air setup.

 

I think Ed is basically saying that is not worth the effort. From a strictly unique stand point, sure why not. But it will be WORK. To build, install, and tune.

I think if an individual TB on each cylinder would yield an enormous power increase, we would see companies making and selling units often.

Like Madmax said, mono blade TB=1300cfm of air, way more than your engine needs!!

Just my 2 cnts

 

You could cut the top of the stock plenum off and mount a filter on it then use ind flappers on the runners by drilling a whole down each side and feeding a rod through them with the flappers connected to it. This would make is easier to control since 4 would be connected together. Not sure if that would defeat the ind tb idea or not but would def simplify it. You would need over sized runner openings since the flappers would inpede air flow if they where tha saem size as the runners.

 

ITS BEEN DONE.



its just a hilborn volicity stack system.......... you can take any of the 8 carb V8 manifolds and convert it to EFI... either by yourself, or give it to a shop to do.



its not hard... if you work everything out before hand, its just as easy as a multiple carb setup.




im making my own FI intake manifold... why? because the other ones suck

TPI - sucks.
Super ram - sucks and costs alot.
miniram - costs way to fuggin much
LT1 - ugly. and i still have to mod the manifold i pay for...


so, im making my own sheetmetal one.... not because its easy, but because it its hard... and a lil diffrent.

 

here.. did a 5 second search on google..

http://www.ez-efi.com/EFI-home-hilborn.shtml

that link has some nice pics....

 

I like this idea, very creative...what about this...you make really short runner and mount the throttle bodys on each runner...then you put the plenum on top of the throttle bodies so that the air will build up inside the plenum and be released when you open the throttle bodies...and it would make better hood clearance too..

 

I get the feeling you are misusing the term 'plenum' and really man to say have 8 individual TBs and then build a custom air cleaner assembly to mount the filter somehwere besides on top of the intake to help maintain hood clearance.

What you are describing is definitely not anything you would be able to do with the stock plenum, nor would you want to.

 

He didn't say that. Having mechanical knowledge isn't going to do anything for you if you don't understand the theories behind making power. Lingenfelter doesn't just make a box and stick a throttle body on it; they research what design will work best and test it extensively. Do some research. You could figure out how well ram air will work if you understand exactly what it's doing. There's useful physics behind every part of your car.

PS the only vowels in warrant are 'a's.

 

Well I've been giving it some more thought and I've come to the conclusion the 8 TBs would be "overkill" and I have decided to try to make a 4 TB system (1/2 ratio for TB/Runners). I believe that it would be better then the stock TPI setup(even ported) for the fact that it would breathe better at higher RPMs due to the shorter runners required for hood clearence. But I'm also figuring that it will be about the same as any aftermarket setup or a converted lt1 setup performance wise and probably would even cost less if not about the same.... There's just more work in it. So just to take on the challenge I'm going to do it. Or at least look into it even more :-)

 

http://www.twminduction.com/v8_kits/v8_kits-FR.html