Quote:
What are the fundamental differences in operation between MAP and TPS then?
I'm not to worried about the install, I'm more keen to know how the different methods of detection translate to driving on the road?
You're trying to work out two things, how fast the piston is moving, so you ignite the fuel/air at the right time so the flame front hits the piston just after tdc
And what the load is like so if you're cruising or idling the revs stay constant and if you're accelerating hard you get as much power as possible.
You can get a very good idea of what the engine is supposed to be doing by looking at the vacuum in the manifold (that is after all what your standard dizzy does) and a good idea of what the driver wants it to do from throttle position. Most ecus use both so you get a good idea of what the engine is doing and what the driver is telling it to do
So ideally you'll get a timing from MAP and RPM then adjust it a bit depending on TPS.
If you've got seperate runners on the manifold with dellortos/webers/throttle bodies on the end then you'll get crazy nonsense from a MAP sensor as you can only easily connect it to one cylinder get a huge pressure change every time an inlet valve closes. So you can't then use that to work out what the engine is supposed to be doing as it'll only give a sensible reading for part of every fourth intake stroke. So you'd have to guess load based on TPS and RPM. This should work well most of the time but won't be ideal. Usually the disadvantages are outweighed by having the precise control over each cylinder that you get with seperate bodies/carbs.
(edited to reflect the fact I've read the thread title as well as the posts in it and we're talking about ignition not fuel injection)