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.

[VaccaRabite]

Like Greg, I also put together a single throttle body Microsquirt EFI based on 1.8 Ljet parts. On a 2056 it made a lot of power, and I spent a lot of time tuning and tweaking it. Which was fun. By the time I replaced it with my current 2.3, I had it running really really strong. It ran like a top, was super fun, and I would 100% NOT do it this way again.

My current engine is using independent throttle bodies on Terminator X. And its awesome, but really complex. Simple stuff like idle control - well it isn't simple with ITBs.

For my bus, I am looking really hard at the Holley Sniper TBI set up. Single throttle body. Self contained (mostly). All you need is a T4 manifold (pretty much the same one you would use for a single carb system) and send it. Its a way simple system without all the extra wires and hoses.

Of course, its not that easy. But after playing with ITBs it will feel that way.

Whatever way yo go, there are some things you are going to need. You are going to need a wide band O2 reader. You are going to need some way to do spark control - and everything is better then a dizzy. Everything on the market these days can do spark control, and its so much better. Mario sells a very good crank fire set up for the T4, though you have to drop the engine to install it, and you want it RIGHT before you put the engine back in.

Zach

[GregAmy]

Mario sells a very good crank fire set up for the T4, though you have to drop the engine to install it, and you want it RIGHT before you put the engine back in.

I'm using his CPS setup on mine, works great...but it requires removing the engine to get to the front.

But...if you're not stuck on sequential injection and ignition (and I'm not, see discussion here halfway down) then Mario is about to produce a 24-2 wasted spark "Mini Cam Sync" that replaces the disty and is driven by the cam:

https://thedubshop.com/mini-cam-sync-v2/

I've not tried it but I'm likely to, once he gets rockin' on production. And it should be a plug-n-play install for my setup. And no engine removal required.