Megasquirt V8 - For 'Serpentine 4.6 GEMS V8 Engines

4.6 EFI 'Serpentine' Trigger Wheel, VR Sensor Bracket, and New VR Sensor Kit.

Our Trigger Wheel Kit for the 4.6 EFI 'Serpentine' comes with a Trigger Wheel, VR Sensor Bracket, and VR Sensor Kit.

As with our other Trigger Wheels - it's CNC cut 5mm thick, specifically designed for the 4.6 pulley on these V8s, giving superb reliability via its Strength & Quality of signal even when in bonnet deep mud !. The 'Slots', as with our other Trigger Wheels, allows fine adjustment to aid setting timing correctly and compensation just in case you don't, around +/- 9 degrees, sometimes needed due to the Crank Pulley Design on these not actually having a TDC indicator !.

Kit contains CNC Trigger Wheel, CNC Steel 'Spacer' (in case you machine off too a tad too much off the Pulley), CNC 'Locking Ring', and 2 x special 'Flange Head Self-Locking 8.8T Bolts' to mount to the Pulley.

The special 4.0 VR Sensor Bracket is including with all fittings, these have 3 way adjustment to help with fine tuning of both the 'Air Gap' and Timing position, along with some shims to get the VR sensor central to the trigger wheel - the picture shows this kit in the fully fitted Position with the Trigger Wheel Mounted.

Note : A small amount of machining is required to the rear face of the Pulley to fit this Trigger Wheel, if needed we offer a machining service of £20 Plus return P&P See Installation Video ) (Supplied in all 4.6 Serpentine Kits)

Complete PWM Control Kit for 4.6 Serpentine Pre Loved Genuine Bosch Controller unit with Mounting Bracket plus Plenum Conversion and Air Flow Meter Tube Kit

We have managed to source a number of good used genuine Bosch units (the pattern ones are dire and die in weeks !).
So, whilst these might be used - the Genuine Bosch Units are really well made, we don't buy these in new as they are over £190 + VAT !!.

This kit is designed to give you 'PWM Control' on your engine. PWM control is in simple terms a 'Cold Start' / 'Auto choke' facility and also helps stabilise tickover.
The programming for these is already built and programmed into all our ECUs, so connect it up and it will work straight away.
It is actually programmable, so you can fine tune your tickover control and the cold start settings to suit you and your engine.

The PWM Kits are again Engine Specific, this being designed for the 4.6 Serpentine Engines. The Kit comes complete with new hoses, a PWM Control unit, and, as the 4.6 EFI Plenums do not have the 'Stepper Motor Unit' that bolts onto the rear of the Plenum like the other 3.9 Serpentine Hotwire versions - we have made one for the Kit !.

To run PWM Control on the 4.6 GEMS Plenum (giving tickover stability and Automatic Cold Start control) you require 4 x Parts - all are included.
These parts are in the pictures but are A CNC laser cut and folded Deep Passivated Mounting Bracket, mounting on the rear cylinder head existing holes (see picture), our 'Output Flange' that bolts to the rear of the 4.6 Plenum, a 'AFM replacment tube', which takes the both the MS MAT Sensor screws in on the top, and has an additional 'Input Port' which is for the final part - the 'PWM Controller.

This AFM Kit comes with all fixings, and, as can be seen in the picture can use the standard Plenum to AFM Air Hose if wished.

Whilst not essential to run MS (many racers just don't bother with it), it really is however a 'Nice to have' and makes for a more civilised engine both in starting from cold and helping to give a rock-solid tickover.)
A Very popular optional extra on our MS1 kits! - And This is NOT supplied in our MS1 4.0 Kits it's an optional extra

Air Flow Meter Tube stand alone version

We now do 3 Models of the 'Megasquirt V8 AFM (Air Flow Meter) Replacement Units'. The 1st is complete replacement unit, and is more suited to those who really need the absolute confidence of having a more waterproof solution. This Model completely replaces the original AFM Assembly which can then be sold. It is designed to replace the AFM where currently fitted, and is secured by 2 Hoses – 1 Hose between Plenum and the Unit, the other between the unit and Air Filter Housing + Snorkel. The MAT sensors supplied by us are a direct fitment into this assembly. (These are NOT supplied in our Standard Kits and are an Optional Extra.)

Air Flow Meter tube which uses part of a 3.9 AFM Unit

The 2nd option is the Model shown opposite. This unit uses the end part of an existing 3.9 Hotwire AFM Assmebly which bolts to the end of the new replacement AFM flange with suitable sealer (LR STC50550 is recomended). This reassembled unit then allows the standard V8 Air Filter Housing to be clipped back into place and maintains everything in the standard position within the engine bay. However, this factory join from AFM to Air Filter Box is sealed with just 2 x O rings, and for deep water wading this factory seal can fail, hence why in competition the complete replacement unit is more often used

However, as a huge Bonus either unit (as can be seen from the picture) offers a vast increase in air flow through the larger unrestricted Gap, which in turn offers an increase in performance which Megasquirt will take advantage of ! (These are NOT supplied in our Standard Kits and are an Optional Extra.)

Air Flow Meter tube the Le Stubby Version

The 3rd option is the 'Le Stubby' - These are as a result of being asked for something very very short where space is a premium. So, these are just 70mm long including being flared both ends. The actual 'Mounting Boss' for the Sensor is 20mm, so, if you add say a hose and have it 25mm inserted into each end, then in effect the unit takes up just 20mm !. Deep Passivate finished, good for those engine bays like mine - that have 'Aaaargh ...bugger all room' problem . (These are NOT supplied in our Standard Kits and are an Optional Extra.)