The V8 Owners Forum -

Hello, i'm planning to replace my carb with an injection kit, im starting from scratch, so what is the best kit to get? Have heard the hot wire set up is better, Are there many differences in the manifolds and plenums across the range of engines?

Thanks.

are you just looking for the hardware to use an aftermarket ecu or are you going to use it complete?

I need everything, the hardware to start with, thinking of going for a aftermarket ecu, not sure which yet.

All the various factory fuel injection systems had different manifolds (even if they look similar!)
Earliest is 'flapper'
Then Hotwire (which had different injectors, a stepper motor for idle speed control, and a hotwire air flow meter)
Then GEMS which was pretty much a distributorless version of Hotwire
Then Thor which was completely different again.

I guess it depends on what sensors etc. you think you need for the aftermarket ECU, then try to find which system has most of them.

Chris.

got a complete vittess efi system .just add a fuel pump and fuel and go
if you are instered

Paul V8 wrote:Hello, i'm planning to replace my carb with an injection kit, im starting from scratch, so what is the best kit to get? Have heard the hot wire set up is better, Are there many differences in the manifolds and plenums across the range of engines?

Thanks.

if you are thinking of putting lpg on , go the flapper setup it's a lot more simple to do , trust me i've tried the other
if your not fitting lpg go with the latest setup you can

There are four inlets - Flapper, Hotwire, GEMS & Thor. They are all interchangeable, but are all different. The first three are iterations on a theme, Thor is completely different.

Flapper & Hotwire are DIY propositions, GEMS & Thor are so tightly integrated into the rest of the vehicle electronic systems that you need to speak to Mark Adams to find out if he can do you a standalone chip for the ECU.

Chris.

If you feel the need to be different, then you can always graft a hotwire system onto a Thor inlet manifold, alleged to give the highest midrange torque. Rear of the manifold needs easing with a dremmel for clearance where the coil packs would have fitted on, and the front needs modifying to allow fitment of a thermostat and elbow, and you need to make up a replacement remote body for the idle stepper motor. The result is a manifold that still gives the necessary clearance for the distributor, and the throttle position sensor is the same input/output volts so no issues there. Manifold is already threaded for the correct ecu temp sender but needs drilling and tapping for the gauge temp sender though.
That's what I have on my 4.7 in my 110..... goes like stink but seems to run out of puff at a lower rpm than I'd like, possibly down to the Lund LE1 camshaft. I'm currently toying with the idea of a Viper hurricane or standard 4.2 camshaft....