Is it possible to take a couple factory throttle bodies and use a 749 and $58 to make it work? i have been told many times it is impossible to make factory (or quasi factory) fuel injectiton to work on a roots blower but i really want to do it, and looking through this forum there's a few peopel who have made centrifugal superchargers work, so is there some magical reason that a couple tbi's and a 2bar map sensor couldn't work with like a month to rune (christmas break is coming up) i appreciate any honest answers, hav'nt built the motor yet, waiting to decide on the blower or not, thanks,

-parker

 

Just off the top of my head, I would think that the fuel would have to go in AFTER the blower. As long as that happens, I don't see wny reason why it wouldn't work.....

I'm thinking that the fuel going into the S/C would cause problems, since you can't compress a liquid......

 

Why not?.
The aftermarket ecms, are just knock offs of the oems. They drop some of the sophistication, for *ease* of tuning, but that's about it. If you can run anything smaller then 83 PPH injectors, then you can stick with an unmodified ecm, since there are some injectors that large that are still saturated.

I run 60 PPH injectors, on my little 231 in batch fire mode with a 749, and it acts just fine. Granted, I've worked on it some to get it this way, but there are others with Syclones running rather well, with 749s.

Rootes, or T/C, the ecm, nor the engine can tell the difference.

 

BDS has been running injectors pre S/C for years. Beating the fuel with the impellers makes for good atomization. Also, more cooling during the compression phase, and better rotor sealing.
Those are all reported findings.

 

thanks guys, last bad question, is it possible to tee off the injector wires to run two throttle bodies simultaneously, there's obviously two carburetors expected to be on a 6-71 and i don't really think that on e throttle body would flow enough, so can you tie the two together or would thta result in half the voltage for each injector so you would get the same amount of gas? would you just have to compensate by changing the tables to put in twice as much gas? thanks for your help,

-parker

 

Hmm, I thought the fuel might cause rotor sealing issues, just purely from speculation though...... The cooling during compression was something that I though may be good, but I also thought the fuel in there would not compress, but I guess it'a only a small part of the mixture when considering the volume......

 

The ECM as is cannot handle 4 TBI injectors. There are several posts here dealing with this, might try a search for injector driver or injector driver board.

 

Erm......guys have been running dual 4-barrels on roots blower for about 50 years now. They add the fuel before the blower. It not only helps cool the rotors and air charge, it also helps to somewhat lubricate the teflon seals on the ends of the rotors.

 

Don't know what I was thinking.....Forest...trees...not seeing.... Someone shoot me.....

 

Your lucky Doc's takin a nap, and missed seeing that.

I guess you haven't heard about Doc's Thanksgiving turkey hunts. This is the WRONG time of year to mention shooting, anything other then turkeys.

There is no simple way to correctly drive 4 TBI injectors.

IMO, it's going to be just as involved to run 8 TPI injectors, as wiring things up to correctly drive 4 TBI injectors.

Firing the injectors TBI sytle is also going to rob you of available PW. The advantage of SEFI over port, is firing the injectors 1/2 as often, so you gain about 5% more time at the higher RPM to have the injectors, on. Now going to TBI, is going to even reduce the PORT Time by another 5%.

 

Just don't let him know where I live!!!