shlammed

iTrader: (8)

I am building a mega-low-budget build with **** that i mostly have.

The build will consist of a Pontiac 400ci engine in an FC shell along with a few other trick parts to make all of it legal for race-only use.
I will be fabbing up a 100% new intake manifold for fuel injection and i want to control spark with MS too.

From what i understand, if i have a crank trigger wheel and sensor as well as an IAT sensor i should be able to do all of this?

Is it possible to get sequential fuel and spark on the V8, or would it be banked injection and spark?


I will be getting more information as the project continues but i hope to get the ball rolling on the drivetrain setup.


Matt

richyvrlimited

iTrader: (1)

You can have sequential fuel and spark, but you need to buy a MSIII daughter card.

Ms1 will be bank injection, MSII can do semi-sequential on a V8.

A standard crank trigger wheel I.e. 36-1 will get you going, but you need a cam trigger for sequential injection.

shlammed

iTrader: (8)

how would you run a cam trigger on a pushrod v8? LOL

a 36-1 wouldnt be enough since there is no cam advance or something similar to VVT?

sixshooter

iTrader: (12)

The stock distributor is driven off of the camshaft. If you lock out the mechanical advance it will stay true. Use a double roller timing chain for less stretch and therefore more accurate timing.

If you do a good job with the intake manifold I might want one also. My Pontiac 455 needs Megasquirt one day.

1-8-4-3-6-5-7-2

richyvrlimited

iTrader: (1)

Cam, see sixshooters comment.

a 36-1 is plenty, but if you want to run more teeth fine. Cam advance/VVT is irellevant fitted or not, they're actuated on the CAM not the crank

shlammed

iTrader: (8)

So cam phasing would show the ECU that it is in compression phase and the trigger wheel would tell the ecu what degree of rotation the engine is in?

or have i not gotten the concept yet? i was under the impression since the cam timing is locked with the crank by the timing chain that a trigger wheel mounted i could offset the missing tooth so that the ecu could fire cylinder XX at 1.25 teeth past TDC from strictly the crank wheel.

richyvrlimited

iTrader: (1)

That's exactly correct what you say. But that doesn't preclude 36 teeth on the crank from not being enough.

Ben

iTrader: (33)

Lots of pushrod V8s have a trigger wheel spun by the cam. It's usually under the distributor.
There are also a few that have honest to goodness cam angle sensors and run distributorless ignition (Explorer V8 and GM LSx for instance)

VVT is not common in a pushrod V8, though there is 1 that I know of, and possibly others I don't.