Reply to "IR - Classic weber IDA or IDA TBI EFI?"

Personally I’d say go with the injection.
But as others have mentioned here it depends greatly on the quality of the components.
And more than just the mechanical parts quality, the computer itself.
In reality all you need is a Weber style manifold fitted with aftermarket throttle bodies.

I have installed a very old 1980’s setup made back then by “Pantera Performance” in Colorado.
I don’t know if they are still around.

On my setup we have installed a more modern Motec computer.
And I cannot speak too highly of it, it’s great.
We plug in the laptop & have the ability to make all sorts of adjustments & fine tune the system.
So far we have the engine running really sweat by the laptop alone, without yet putting the car on the Dyno.
When it does go on the Dyno we will have the ability to set the air/fuel ratio precisely.
With the Lambda sensor fitted in the exhaust the computer will tell us exactly what the Air/Fuel ratio is, (Should be around 14:1).
We can also set the RPM increments as low as 20 rpm, (not that you would as it would consume too much time).
Which means you bring the car up to say 1000 rpm, check the Lambda reading & then dial that RPM to 14:1 air fuel & also the timing to suit.
If you wanted to be really pedantic about it you could then bring the Revs up to 1020 rpm & do it all again & keep on lifting the Rpm on each Dyno run by the precise rpm increments.
That obviously takes time & through the 1000 rpm to 3000 rpm we will maybe set it at 150 rpm increments & above 3000 rpm maybe at around 250 rpm increments.
I will leave that up to my Dyno guy as I’m not expert on that stuff.
But you get the idea.
The difference between a carburetor & fuel injection is like comparing a bucket with holes in the bottom to a Cray super computer.

You will also need to notch out the rear hood to fit around the throttle bodies.

Attached here is a picture of the setup so far.
I designed & machined the Velocity stacks to suit low to mid range torque, combined with CHI heads that have 3V ports, flaring out to 4V size to match the 4V manifold.
Compression is 11:1 in which I run pump 98 octane fuel.

It’s a lot of work to do the install, so be warned !

Regards,
Tony