Maxing out AFM using PFC

[aqik33]

Guys who have done this before, what do u do??

If when running a Power FC u hit the 5.1volt AFM max reading??

DO u replace it with a Z32 or what??

[Sydneykid]

Guys who have done this before, what do u do??

If when running a Power FC u hit the 5.1volt AFM max reading??

DO u replace it with a Z32 or what??

When does it hit 5.1 volts? And does it stay there for long?

Hitting 5.1 volts at 7,000 rpm is not a big problem, while hitting it at 4,000 rpm and it staying there all the way to 7,500 rpm is a big problem.

[aqik33]

Hyperthetical question, sorry. I am interested to c what avenue of escape there are if this happens, straight to Z32??or clever tuning?? Mine gets to 4.5volts @ 6800rpm.

[Laurence]

While it is not nice, you will pretty much always being driving at WOT from 7,000 onwards.

As long as you tune it properly it will be fine. Just don't increase the boost later

[mokompri]

yeap swap to z32 and it will give you more headroom

if you max out the afm near the very top say for example 6500rpm, then you can tune the 5v signal to be spot on for 7500, and just have a rich spot from 6500 to around 7400

just to avoid a lean mixture and detonation up top

i personally would just get bigger afm though

[Laurence]

It doesn't matter what the signal says...

Power FC uses Load vs. RPM on the map, when the AFM is maxed out the load value will not increase but the rpm will be mapped out to 9,200rpm or whatever so you can still tune it properly. No need to richen it up more than usual.

I can't think of many situations where you would use part throttle at 7,000rpm+ and even if the actual load was lower than the real load you would be putting in more fuel anyway so effectively it would go rich because it was pumping in fuel as if it was at WOT until the AFM starts to read real values again.

[Sydneykid]

I go through 7,000 rpm a lot of times when not on full throttle, everytime I change gear for a start. Then driving though corners holding it on the throttle, not the best time for a cough. GTST's don't have inlet air temp compensation, so my best friend when it gets very hot or very cold is the AFM. The inlet air temp change alters the AFM readings, as it measures the air flow and therefore the air density.

Personally, if it hits max voltage at 4,500 rpm, then I reckon it's time for a Z32 AFM.