Thread: 4.6 into '81 two door

Originally Posted by DoubleChevron

Is it really that expensive to build the megasquirt kits.

With everything else you need - yep and that is building it yourself and getting the bits from the two major suppliers.

Like everything, you can always pick up stuff used or not complete on Ebay a lot cheaper

Originally Posted by DoubleChevron

I was figuring the kits, wiring, commodore coils ..... maybe $1000 and a lot of time and tinkering.

A base kit will cost 800 pounds and then you need test modules, software, fuel pump, regulator, trigger wheel, sensors, O2 sensors, replacement MAF different thermostat, - it goes on and on and on.

MS3 and add ons will cost more.

In the context of what the OP is proposing it is just not cost effective - if you want injection just get an old 3.9 and take of the 4CUIX injection and ECU off it and put it on your 4.6 - switched power and off you go - maybe get a remapped 4CUIX ECU to put a bit more fuel into the 4.6 - sure, not quite as powerful but you wont notice the difference and a lot cheaper.

Garry

double post

Originally Posted by garrycol

With everything else you need - yep and that is building it yourself and getting the bits from the two major suppliers.

Like everything, you can always pick up stuff used or not complete on Ebay a lot cheaper




A base kit will cost 800 pounds and then you need test modules, software, fuel pump, regulator, trigger wheel, sensors, O2 sensors, replacement MAF different thermostat, - it goes on and on and on.

MS3 and add ons will cost more.

In the context of what the OP is proposing it is just not cost effective - if you want injection just get an old 3.9 and take of the 4CUIX injection and ECU off it and put it on your 4.6 - switched power and off you go - maybe get a remapped 4CUIX ECU to put a bit more fuel into the 4.6 - sure, not quite as powerful but you wont notice the difference and a lot cheaper.

Garry

Interesting... Why aren't you using everything that is there. Why not use the temp sensors and MAF that is already on the P38 engine The fuel system will have to come from another injected rangie. Why a different thermostat. The engine needs to run at it's designed temperature. Doesn't the software cater for most types of MAFs and sensors.

I'd leave everything "P38" except obviously the trigger wheel. If it's not a bastard odd tooth count (like the Citroen CX ) why wouldn't you use the factory ring gear and TDC sensor rather than a trigger wheel.

The software is free isnt' it ... That's the whole idea of megasquirt ( I'm a programmer by trade that works in linux). There would certainly be a "bog standard" 4.6 megasquirt map out there somewhere you can use!

seeya
shane L.

Ok - a myriad of questions that I am not going to go through on this thread - all I will say is that it is not just a simple matter of bunging on a basic MS ECU.

You need to learn a lot more about MS and a good start is to visit Megasquirt Support Forum (MSEXTRA) • Index page

and
https://www.diyautotune.com/shop/

and
ExtraEFI HOME

and
Megasquirt for V8 engines - What is Megasquirt

Cheers

Garry

Originally Posted by garrycol

Ok - a myriad of questions that I am not going to go through on this thread - all I will say is that it is not just a simple matter of bunging on a basic MS ECU.

You need to learn a lot more about MS and a good start is to visit Megasquirt Support Forum (MSEXTRA) • Index page

and
https://www.diyautotune.com/shop/

and
ExtraEFI HOME

and
Megasquirt for V8 engines - What is Megasquirt

Cheers

Garry

Thanks!

I'll have a look. I"m not trying to argue at all. I'm just genuinely interested in how this is to done!

seeya,
Shane L.

........OK, maybe I should have come back to these post a bit sooner, for starters, I'm not really interested in a fuel injected motor, if I can fit my existing manifolds and CARB and gearbox/transfer to what I am hoping is a good 4.6 block....happy camper
Maybe I should forget the diffs and go with early Disco ones, supposedly they fit pretty easily ( comments welcome )
The seats I can play with ......anything I've missed ??

Roger

Yep, you can make the 4.6 a straight carby motor by doing what Bee Utey said - you'd never kniw the difference by looking at it, but you would notice it when driving.

You'd need to get the carbies retuned for the larger engine, but apart from that some gaskets and time.

Disco Diffs are a bit better as they have 24 spline axles, but you could save the drama of replacing the entire units by getting a 24 spline centre - a locker or similar, then sticking decent axles in it.

There are some really nice V8 inlet manifolds for carbs