Another carb question

[Jimmy_GTT]

When I'm reving my friend's GTT from 2000 till 5000 with a 2/3 throttle (in this case boost is around 6-7psi) first as the acc pumps a bit it gets around 12-12,5 but soon after leans out till 16-16.5.
If I rev the car with wot than it is around 13-13,5 all the range. (std. boost around 10psi)
Is this normal from a std. carb or shall I check something?
Thanks again.

[SCHWARTZ]

is this just revving the engine in neutral? as i think the engine would need to be under load to give you a proper reading.

[Jimmy_GTT]

is this just revving the engine in neutral? as i think the engine would need to be under load to give you a proper reading.
No, in 3rd gear.

[SCHWARTZ]

sounds like its a bit lean all over then. theres articles on here that explain what the readings should be at, at what rpm, throttle position etc...

[Jimmy_GTT]

sounds like its a bit lean all over then. theres articles on here that explain what the readings should be at, at what rpm, throttle position etc...
I've read trough all articles but I've only found readings at WOT and I haven't found readings for half or 2/3 throttle.
Maybe I'll try a smaller a/c.

[Sparkie]

you need to make a note of the vacuum readings in relation to the afr readings.

[Jimmy_GTT]

you need to make a note of the vacuum readings in relation to the afr readings.
There is no additional turbo gauge in the car only the one in the instrument panel. So I only know pressure at the carb top.

[Jimmy_GTT]

I've also observed another abnormal behaviour of this car.
Cruising on a flat road in 5th gear around 3k rpm, boost is around 2-3psi @carb top and the AFR readings are a near constant high 14s than after a while suddenly low 13s. And not only for a moment.
I have already checked the fuel flow. 1bar at the FPR, running the pump for 40s and it pumped around 1,2l. And the flow seemed to be constant.
Could it be an air leak? But where?