Single Throttle Body Setup Question Options

[Craigers17]

This thread is meant to "sort of" piggy back off the current thread on fuel delivery setup options. I see that Clay has this link for a complete modern EFI system:

https://store.allzim.com/914-parts/fuel-del...efi-conversion/

...and I know the Dub Shop has a similar setup. I also see that the Dub Shop has both a single throttle body & a turbo plenum single throttle body setup. Here:

https://thedubshop.com/single-throttle-body-intake-package/

and...here: https://thedubshop.com/single-throttle-body...-turbo-plenums/

Sooooo....since I'm not the sharpest knife in the drawer, can someone educate my dumb ass on why it seems much harder to develop an aftermarket single throttle body setup for a Type4 / 914 engine as opposed to a Type 1? Or maybe I should say as opposed to one with a Type 1 shroud. It seems like the air and fuel travel the same distance. What am I missing? I do realize that 2-3 companies are working on this....just wondered why it seems to be more of a challenge.

[ClayPerrine]

This thread is meant to "sort of" piggy back off the current thread on fuel delivery setup options. I see that Clay has this link for a complete modern EFI system:

https://store.allzim.com/914-parts/fuel-del...efi-conversion/

...and I know the Dub Shop has a similar setup. I also see that the Dub Shop has both a single throttle body & a turbo plenum single throttle body setup. Here:

https://thedubshop.com/single-throttle-body-intake-package/

and...here: https://thedubshop.com/single-throttle-body...-turbo-plenums/

Sooooo....since I'm not the sharpest knife in the drawer, can someone educate my dumb ass on why it seems much harder to develop an aftermarket single throttle body setup for a Type4 / 914 engine as opposed to a Type 1? Or maybe I should say as opposed to one with a Type 1 shroud. It seems like the air and fuel travel the same distance. What am I missing? I do realize that 2-3 companies are working on this....just wondered why it seems to be more of a challenge.

I have talked with Aaron @zims ( @Partsguy22 ) and while it would be easy to setup an aftermarket EFI system that used the stock 2.0 intake plenum, throttle body, and air cleaner, it has two disadvantages. 1. The throttle body is a restriction in the intake, and 2. it would require completely different programming. Most people that put aftermarket EFI on their cars want the extra performance.

Granted, you could put a new plenum on with a larger throttle body, but you are still faced with the same pressure drop issues at low RPMs that are resolved by multiple throttle bodies. Smaller runners increase air velocity at low RPMs, increasing performance. But a single small throttle body restricts air at high RPMs. That's the reason that car manufacturers used 4 barrel carbs instead of just one giant barrel.

Now if someone wants a "Stealth" EFI system that looks like a factory system, it can be done. But it would require some lateral thinking on how to hide all the "modern" components.