TBI EFI on a dual plane manifold?

[R.Olds]

I am putting together a mild 347 sbf, and am going to run the FAST EZ EFI 2.0 TBI system on it.
I already own a Performer RPM intake, but have some concerns about the TBI working with the center divider.
Can a guy get away with simply removing the divider, or should I start shopping for a single plane.

TIA
Rick

[F-BIRD'88]

Why would the divider present a issue?
Leave it alone.

[Geoff2]

What he said.

Why would Edel put a divider in there...if it was not needed?

[R.Olds]

Why would the divider present a issue?
Leave it alone.

because the MAP will only be reading from one bank.

[R.Olds]

What he said.

Why would Edel put a divider in there...if it was not needed?

Because the manifold was designed for a carb....

[Carnut1]

Screenshot_2016-10-17-06-56-32.png

This may work I used this to help even flows on this dual plane design. Made for a very responsive tbi setup. I like this better than milling out the whole divider. Thanks, Charlie

[F-BIRD'88]

The most you'd need to do then is add a small carb spacer.
This will allow enough right left side sharing so the MAP sensor works
If that is even neededat all.
Do not remove the divider. And its not just for a carb.

[stangbuilder]

i run the sportsman lap top tuneable software...alot of guys have tried a T/B setup on a dual plain....will it work?..Yes...single plain way better idle all the way to red line..My car run about 15--20 degress colder with the open manifold
http://www.cpgnation.com/forum/forums/f ... forum.235/ Check this out alot of good info there many posts about your question on there

[cjperformance]

Why would the divider present a issue?
Leave it alone.

because the MAP will only be reading from one bank.

Think about what happens in closed loop with a fully divided dual plane as the ecu reads o2 from 1 collector. The o2 is reading 2 cyls on one plane and 2 cyls on the other plane of the intake. Unless the intake has perfect fuel/air distribution plane to plane you can have 2 rich cyls and 2 lean cyls, the o2 then reads this a/f from 4 cyls as an average a/f. If the average a/f is rich the ecu compensates by reducing fuel, everywhere to get the correct average a/f. What just happened to the a/f in the leaner of the 2 cyls??

[DaveMcLain]

Why would the divider present a issue?
Leave it alone.

because the MAP will only be reading from one bank.

Think about what happens in closed loop with a fully divided dual plane as the ecu reads o2 from 1 collector. The o2 is reading 2 cyls on one plane and 2 cyls on the other plane of the intake. Unless the intake has perfect fuel/air distribution plane to plane you can have 2 rich cyls and 2 lean cyls, the o2 then reads this a/f from 4 cyls as an average a/f. If the average a/f is rich the ecu compensates by reducing fuel, everywhere to get the correct average a/f. What just happened to the a/f in the leaner of the 2 cyls??

GM did exactly this setup on the old TBI engines from the late '80's and early '90's and it worked fine.

[cjperformance]

Was that actually fully divided? I havnt seen one of those but every othet tbi I've seen had some form of sharing at least vis a larger than needed pcv spacer or idle speed air feed channel.

[Carnut1]

Stock tbi intake had an angled window between plenums.

[DaveMcLain]

Stock tbi intake had an angled window between plenums.

GM TBI connected the map sensor to a port on the throttle body that allowed it to "see" both sides of the intake.

[Geoff2]

What do you think is different between a 4 hole TBI & a carb with 4 throttle bores, in terms of air flow that the plenums see? None that I can see that would warrant removing/altering the plenum divider.

[pdq67]

Screenshot_2016-10-17-06-56-32.png This may work I used this to help even flows on this dual plane design. Made for a very responsive tbi setup. I like this better than milling out the whole divider. Thanks, Charlie

Charlie,

That intake looks like it is an old C4B, but the part number looks to be different.

Is it a C4B??

pdq67