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350Z AC NOT WORKING


thedbaz
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hello,

sorry to bring back an old thread, but my AC is not working either. 

i have the fans configured to come on with the AC. 

im guessing because the AC clutch control output isnt set and i cant seem to find what AUX output it should be in the manual.

thanks for your help!!

 

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Moved to G4X forum.  Im pretty sure no output needs to be assigned for the AC clutch, the CAN looks at the AC Clutch status runtime directly.  

Can you give us a short log with engine running and AC switch on.  

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thanks. i have set output to be virtual aux 3 now to be AC Clutch after posting that and seeing output said none, but didnt know if there was more to it than that or not.

i didnt find a specific output for it, so i just used the next one available after the fans.

i will try to get some logs tomorrow, as its currently raining and the roads are too wet.

thanks!!

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thank you for the help.

after assigning virtual aux3 to AC clutch, the AC is now working again.

the idle is not happy about it, so i will have to look into those settings. 

i dont have the ac idle up option in my settings but i have the ac clutch offset. so i adjusted that from 1.0 to 1.2, is there anything else i can adjust to bring the rpm up some when the AC is on? is there an AC ignition timing increase option?

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  • 1 month later...

so i am still having an issue with getting the car to idle correctly when the AC is on.

ive increased the AC offset table to 1.6. 

i for some reason do not have the AC idle up table.  where do i find this table?

 

image.thumb.png.805e33ed96d1544f95a03d2b458dda52.png

Nissan 350Z Manual trans quad VVT 7Bar G4X Xtreme Plugin - 600cc - AFR Traget - Fuel Table - IGN Table - 20220618 - 1612.pclx

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9 hours ago, thedbaz said:

i for some reason do not have the AC idle up table.

You are in open loop so there is no target.  You will need to use closed loop to have targets and idle up offsets.  

I would say your main issue is the idle ign set-up, you have it set up very restrictive so it cant increase instantanous torque much when needed.  E-throttle alone is too slow to correct for sudden changes in load. 

Also I dont like your E-throttle target table, generally it should have zeros across the top row.  If you attach a log of a cold start and warm up, then also turn AC on/off a couple of times when warm I will suggest some changes to get it closer. 

 

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13 hours ago, Adamw said:

You are in open loop so there is no target.  You will need to use closed loop to have targets and idle up offsets.  

I would say your main issue is the idle ign set-up, you have it set up very restrictive so it cant increase instantanous torque much when needed.  E-throttle alone is too slow to correct for sudden changes in load. 

Also I dont like your E-throttle target table, generally it should have zeros across the top row.  If you attach a log of a cold start and warm up, then also turn AC on/off a couple of times when warm I will suggest some changes to get it closer. 

 

HI Adam,

thank you. yes ive been thinking that the idle needs to be changed to closed loop for a while now, since i cant seem to get it to be right with the AC working. it was in open loop from the base tune, same with the idle ignition. 

what should the values be for the idle ignition?

the ethrottle, i was using that to keep the idle stable and to get it to idle smoothly. which is probably not the correct way to do it either.

here is a link to some logs from last night and this morning and the tune file. i also have hot start issues where it takes a while for the car to fire up.

https://nasatka.box.com/s/rs6czmmehjrj527hp9yypukwh0040bvb

thank you very much for the help!!

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HI Adam,

here is the tune and log file from making the changes you suggested. 

https://nasatka.box.com/s/44jew7pjzwxosiqiui904qauq2tocbl5

the car can now not idle at all with or without the AC on. with the AC on, it idles a little better with the AC on because the idle is set higher.

im guessing it needs some PID tuning, since its swinging way up and then way down on correction. i predominantly copied the idle settings out of the 350z base map for 7 bar with vvt.

the car died multiple times on my way home when it would try to idle at the shop lights. i would sometimes have to hold my foot on the gas and keep the rpm up to keep it from stalling.

thank you for your help.

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