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Brief description of the issue:
The Cessna 152 engine reacts way too slowly to throttle inputs, also, also engine rpm at idle inflight is way too high, around 1500rpm at 80kt.
Of course there is variation from aircraft to aircraft, but I would expect it to idle at around 1100rpm at that speed, 1500 is incredibly very high.
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The Cessna 152 POH shows normal engine RPM 1900 to 2550. Not sure what info shows 1100 RPM as normal operating. This RPM is good for taxiing.
As for “slow response”, granted it isn’t the fastest airplane in the hanger. The “slow response” is perfect for a trainer which it is mostly used for. Depending on the device used for the throttle, you might be able to adjust the responsiveness in the Sensitivity menu in the Control Options.
Above, you can see what I’m talking about.
The idle rpm depends on your airspeed of course, but I’m finding the sim’s very high, right at the beginning at around 60kt, it is 1000 in the real airplane, 1300 at the sim, also at the go around, you can see how fast engine response is in real life, it pretty much accompanies my hand with little delay, meanwhile the sim takes 7 seconds, to reach the desired rpm.
Looking at the videos you’re certainly right that the RPM seems to respond significantly slower in the sim. I counted something like 3.8 seconds vs. maybe 1.5 seconds to full. That is despite you pushing the throttle in way faster in the sim.
Again, OP was talking about what the RPM is at idle. You know, when you close the throttle completely and the engine is still running but doing as little work as it can. Not cruise RPM.
Not sure what C152 you are flying but 1100 to 1500 RPM I’m flying barely above stall speed. To fly straight and level at 80 knots the RPM was about 2300.
Wow, you really don’t understand what IDLE is.
You know, when you pull the throttle all the way back???
it is called IDLE, that’s what I’m talking about, not Cruise rpm.
If I speed up the C152, it goes slower back to 1000 with the rpm, but it also depends on the airplanes speed ( I assume wind effect , airflow through propellers ? ).
EDIT:
now I checked same with the C172SH… and the rpm goes down also in case the C172 is in fast movement.
I misunderstood the issue. I thought that “idle inflight” meant “idle when flying at an altitude”. I was also confused about the 1500rpm at 80 knots. I assumed this meant 1500rpm at 80 knots while flying in the air, not on the ground. I didn’t think it was possible to maneuver the C152 on the ground at 80 kts since takeoff and landing speeds are much lower. I am still somewhat confused about the idle at 1100 or 1500 rpm. My C152 idles at 750-850 rpm when parked. Setting the throttle at 1100 to 1500 and releasing the parking brake I am starting to taxi but definitely not at 80 knots.
Regarding throttle response, have you tried changing the keybinding sensitivity and reactivity? I’ve had to make separate configurations for different single engine GA aircraft because some aircraft have flight and throttle controls that are too responsive.
at the ground it idles at 800 rpm, in real life on the ground, stopped, it also idles around that, between 600 and 800 rpm.
But when you’re flying the IDLE rpm will change based on your airspeed this is normal behavior, all I said is that I think that the IDLE rpm while flying is a bit too high compared to all the cessnas I’ve flown.
I think it is wrong and unintentional because the aerobat for instance does not IDLE inflight as high, this happens only to the cessna 152 with the new prop dynamics.
As for the response times, they are clearly way too slow, and it is not my controllers and sensitivity, I know that, because for instance the Cessna 172 doesn’t suffer from this, and responds appropriately, this excessive delay is exclusive to the 152.
Piston engine aircraft respond very fast to throttle input, I hope Asobo can sort this out for our good old 152.
may be we can modeling real idle in virtual cessna by leaning mixture to extremely low? if at that’s mixture engine will buk-buk-buk and stop. after drop some rpm and at 80kts it’s will less than 1500 so everything ok?
the normal cruise rpm is fine and the OP spoke about “80knots”. So for me was the usually situation then “Cruise” where we try to hold the speed … so I had may same in mind as I posted that image, as what @PacificSet90456 had in mind . Therefore in my newer post I clarified it to “movement”.
I not own a C152 and I not know whether the effect from "wind / airflow " on the rpm, which is seemingly simulated in MSFS, does realy exist in real world for a C152. In MSFS you can go up into the air , go to idle , and then pitch up/down ( get faster or slower ) directly affects the rpm - same as if you are in fast “movement” near the ground. The “slow rpm” effect seems also because of the “movement / airflow” , what I mentioned.
I fly usually the C172 in MSFS and there is not these dependency to the airspeed.
thats may be more accurate words as my “not” … at least at ground is near zero noticeable ( full speed over the runway ) and also in the air ( full speed to ground in idle ) the rpm diff is not very high ( from ~700 till 1200 in yellow speed range )
Yes leaning the mixture too low will kill the engine, not idle it. The displayed rpm is the air turning the propeller.
At cruise, straight and level, 80 knots would need minimum cruising rpm of about 1900 rpm and appropriate trim.
At 1500 rpm the airplane is descending at 80 knots. At IDLE rpm the airplane cannot maintain straight and level flight. This is how I used to practice stalls in a C152. I would climb to about 3,000 ft and then fly straight and level. I would then pull the throttle to idle and use the elevator to maintain 3,000 feet. The airspeed would drop, drop, drop until the airplane was stalling. To recover from the stall, I would apply full power and push the nose down and not lose more than 100 ft. I’m not watching the rpm at all. The only times I use the rpm are during pre-flight doing the magneto checks and carb heat check and leaning the mixture during cruise.
Regarding throttle responsiveness, different peripherals have their own response depending on their mechanics and age and should be recalibrated as part of regular maintenance.
A good test of throttle response is to perform this test. Before starting MSFS to unplug all peripherals except for the keyboard and mouse. Use the keyboard default keybindings. Using the default keyboard, F1 - F4 control the throttle. Pressing F4 should give full throttle almost immediately. F1 sets the throttle to idle. Compare the full throttle times keyboard vs. peripheral.
isn’t it overkill? set by virtual throttle or by f1 just same except time for pull back. about 80knt it can be got in dive by right angle at idle. if real stuff gives at that situation 900rpm. that’s mean engine off give you same 900rpm or lowest mixture i guess or magnetos off if fuel have octane high enough. as guys said before in game idle is not idle for cessna but low throttle. so in any way for test it right we have to shut the engine down or take power by any way at idle equivalent power for know it’s works right or not right. any way take got 80knts is not problem if we have alt enough for dive it at that speed
This issue is clearly not related to how peripherals perform if you look at OP’s video. You can see the virtual throttle (which is going to react only after peripheral inputs have already been received) closed extremely fast and yet it shows up on the RPM gauge way slower than it should be looking at footage from the real aircraft.
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… so I had may same in mind as I posted that image, as what 
) and also in the air ( full speed to ground in idle ) the rpm diff is not very high ( from ~700 till 1200 in yellow speed range )