Load sites

[antonyj]

Just looking for some info on how load sites work.

I understand that the speed site looks at engine speed.
Is the load site determined just by the TPS?

If so why do people run a MAP sensor and or a AFM?

[stevieturbo]

TPS vs RPM is ok for a normally aspirated car, but crap for a forced induction.

MAP vs RPM is the proper way to tune a forced induction car.

Airflow meters allow for a much wider range of variables, to control fuelling etc, but are more complicated, and in a performance car, not really necessary.

[mongoose]

antonyj said:

Just looking for some info on how load sites work.

I understand that the speed site looks at engine speed.
Is the load site determined just by the TPS?

If so why do people run a MAP sensor and or a AFM?

i run my omex with just TPS and it works very well.The manual suggests that just TPS is used for N/A engines,but that MAP sensor is essential for forced induction.When i first looked into an alternative ecu,i was also warned by others to keep it simple,and just use TPS for best performance.I'm now wondering just how easy it'll be to map the JE tripple throttle plenum i'm getting,when just using TPS.Someone has suggested to me to use a MAP sensor in this case,but to my simple brain,surely the pressure will also vary quickly with the throttle openings,and therefore be little easier to map than just TPS?Anybody care to comment?

[antonyj]

I also have a set of the range rover coils (4x2coils), would something like the emerald ecu control these directly?

[stevieturbo]

TPS is still used for acceleration enrichment ( pump jet ) in most cases

Even if it isnt, MAP signal usually responds fast enough anyway. It wouldnt be anything new you are trying out. These systems are well tried and tested.

Most aftermarket ecu's can fire pretty much any coil pack, one way or another. Some may also require an amplifier, some have them built in.