My 4.6 V8 Rebuild Thread

[slug_burner]

You don't need a Megajolt if you have an MS3, just need something to convert the 5V logic level to something that will drive the ignition coil pack. I don't know if there are coil packs that can be driven directly from the 5V logic levels. Maybe a coil on plug arrangement works on 5V levels.


From the Q&A section

b. Will you be controlling ignition timing?

If NO, then MegaSquirt-I™ will most likely suffice. If YES, then an MS-II® or MicroSquirt® (or MS-II Sequencer®) is your best option for controlling spark advance. MicroSquirt® or MegaSquirt-II™ can control up to two ignition outputs, meaning either can do a 4-cylinder engine with 'wasted spark' ignition. For full sequential fuel injection with up to 8 ignition outputs (up to 8 cylinders), the upcoming Sequencer controller is your best bet.

MS-II Sequencer or MS3 both are similar, the later has a faster processor and as a later product has a few more bits.

With a MS1 or MS2 you will be batch fuelling with banks of injectors, on a V8 it will work but will not be the best for fuel economy but probably on a par or better than a carb. You are going to be misting each port with four shots from it's injector for every induction stroke. Probably marginally better than single point injection, at least as will not be running a wet manifold.


Using the MS1 is probably the cheapest way to get some form of electronic fuel control to get that motor started but you will need something else to do your ignition control. even if it does not have variable ignition. I don't know if the IDES system will help with the ignition for the MS1 or MS2, others with experience appear to think it can. So a simple solution may be possible for less than $500.

[101RRS]

but what was the reason for wanting to use Thor?

Well given all the expense of doing a rebuild I wanted to maximise its output. The easy solution was to go carbs and a dizzy and standard exhaust and this is still an option. At the other end, as it is a Thor engine was to go the Thor injection system - provides the best economy, produces higher torque lower down and higher torque overall but has slightly less power than GEMS at the top end.

When researching whether to go carbs, 4CUX, Gems or Thor I asked lot of people a lot of questions on a lot of forums on three continents and the consensus was that Thor would be the way to go and that MS could do it all at a reasonable cost. The reality was that development of MS for Thor had not been completed and that costs were very high. Despite all the rhetoric I still haven't come across anyone with a Thor with MS or any other aftermarket ECU. Without major cracking work the Bosch Motronic will not work out of its parent car so cannot be used.

Hence my further search for options. At this stage nothing ruled in or out.

Garry

[chazza]

You don't need a Megajolt if you have an MS3, just need something to convert the 5V logic level to something that will drive the ignition coil pack. I don't know if there are coil packs that can be driven directly from the 5V logic levels. Maybe a coil on plug arrangement works on 5V levels.

I have an MS2 which has been made to fire the coils from the ECU; they call it direct-fire and therefore there is no EDIS. The disadvantage is there is no limp-home mode; however; one doesn't have to buy an EDIS8. So in answer to your question the coil-packs do not need an EDIS always.

From the Q&A section

b. Will you be controlling ignition timing?

If NO, then MegaSquirt-I™ will most likely suffice. If YES, then an MS-II® or MicroSquirt® (or MS-II Sequencer®) is your best option for controlling spark advance. MicroSquirt® or MegaSquirt-II™ can control up to two ignition outputs,

Where did you find this Sluggie? I don't understand it, because Megajolt and all of the Megasquirt variants, control ignition timing! In addition Megajolt comes pre-programmed so that two ignition maps can be put into it. On my MS2 I asked the builder to make it so that two ignition maps can be installed - one for gas and one for petrol.

The only reason I chose MS2, was because I wanted to keep the stepper-motor; I am fairly certain that MS1 can have two ignition maps.

MS3 can control sequential injection, but I don't think having that facility is worthwhile on a 101,

Cheers Charlie

[slug_burner]

Chazza,

I got it from here MegaSquirt® FAQ Main Page. This is a bit dated as I know that people have developed modifications that have allowed ignition control or more ignition drivers than what the original MS1 or MS2 came with. What people did was they converted some of the LED drivers to ignition drivers. There is also a site where some of the extra bits that people have done are recorded, that is the MSExtra hardware manual, this is the MS 1. http://www.msextra.com/doc/ms1extra/...are_Manual.htm. There is one for the MS2 as well.


Nothing stays the same, so it looks like getting that Thor engine going under MS control is getting cheaper. My friend with the race car says probably around $300.

[Hoges]

FWIW: Saw this earlier today in another thread. Buying advice
Relates to a 1989 RR for sale.
The relevance is that it is fitted with a "new" 4.6 and from the photos in "Carsales" http://www.carsales.com.au/private/d...SSE-AD-2674122 it seems to have a distributor, but it's not clear as to whether it's carby or EFI. The work was done by Les Richmond Automotive.

JustinC in his comments gives a phone number/contact for LRA ...may be worth asking said contact about the details of the 4.6?

cheers