ben73

Hey Guys,
I haven't been on here in a long while.

I wanted to ask what the current best way is to drive 2 extra TBI injectors.
Does someone make an injector driver board, or is there a SSR that's fast enough?
I want to do 2xTBI's on a dual quad intake for my next project.

Thanks,
Ben.

1991sleeper

iTrader: (-3)

Rbob on ebl flash thread can prolly help u out real quick like

DynoDave43

iTrader: (11)

That would be an interesting build to follow!

Formula 305

You have my attention sir. The thought of a multiple TBI setup with the 2barrel TBs (not the single barrel crossfire TBs) has crossed my mind a few times. I would love to see someone pull this off, maybe if its not tooo difficult I'll attempt to follow in your footsteps when I get around to doing my 350 swap

ben73

It's been discussed here many times in the 10+ years I've been reading this board and playing with TBI/CFI, but I don't recall anyone actually doing it..

A 2" BBC TBI will supply enough air/fuel for most small blocks, 2x2 on a 2x4 intake just looks cooler... Tripower even cooler again

Formula 305

Tri-power would be bada$$, but thats probably why its never been done, a single TB would be way easier.

1991sleeper

iTrader: (-3)

Would b awesome to pop the hood on a N/A 10-11 sec car and show off a dual TBI setup lol ... people b scratching their heads for a week .... saying was that car really tbi

Fast355

iTrader: (2)

I have considered fabricating an upper plenum for dual TBI numerous times for one of the leftover L31 Vortec lower manifolds I have hanging around. The manifold itself is very similar to crossfire and has massive runners compared to a crossfire. A small cap HEI EST distributor will also clear at the rear of the manifold. After all the vortec injector junk was removed out of the plenum and the manifold was ported out I feel it could easily flow 260+ CFM.

DynoDave43

iTrader: (11)

Yup...that would look pretty sweet.

Wonder how these guys make it work?

http://howellefi.com/tbi-kit-twin-tb...ig-blocks.html

Fast355

iTrader: (2)

My personal favorite TBI setup! Its a big block that came from the factory with dual 2" bore TBI units and a blower and has since been upgraded to an 8-71.

DynoDave43

iTrader: (11)

Woah! What "factory" did those come out of? What were they used for?

Fast355

iTrader: (2)

Well those are Mercury Marine 575 SCI engines. They came with a smaller blower, but have been retrofitted to 8-71s.

RFmaster

Fast

I looked at Vortec intake couple years ago for a possible 2x2 TBI setup. The bottom portion of Vortec intake does not offer too much plenum volume - it is not a bath tub shape like CF intake. Vortec intake plenum volume is in the upper portion of intake. I would have to start with 1-1/2" or thicker solid block of 6061 to machine an upside down tub to have decent intake plenum. Alternatively, a 2 piece solution consisting of a ring frame and tub top cover can be machined to achieve decent intake plenum. Unfortunately, I no longer have access to XYZ measurement and inspection system and CNC center. CAD design is 1/3 of the effort while measuring existing bottom portion of the intake and fabrication are the other 2/3... It does sound like a fun project!

//RF

Fast355

iTrader: (2)

^^ You nailed it, I had also thought of using a CNC aluminum upper plenum roughly 2-2.5" tall. I would have also machined a bit of a plenum divider into upper half as well to keep the banks somewhat seperate. Then I decided it was cheaper to just pick up a marine intake and go MPFI.