Write up on how I made my not so great A/C a little better.
08-09-2016, 03:55 PM
#451
I have a question. I have access to software to custom tune my truck. I was looking at some settings in the A/C section and figured before I go messing with them, I'd ask here.
So my trucks computer code is WBY5. The newest Ford codes is WBY7. I compared these two and noticed a change to the A/C settings.
WBY5
AC Head Pressure to Disable Clutch = 475
AC Head Pressure to Reenable Clutch = 340
WBY7
AC Head Pressure to Disable Clutch = 465
AC Head Pressure to Reenable Clutch = 340
So as you can see in the newer code, Ford lowered the PSI to Disable the Clutch. My truck still runs the older code WBY5. Generally you would think that if Ford creates and update, it should be "better". We know this is not always so. The question is, which would be better and why? I dont want to mess up my A/C system, but I'm looking at this as a possible alternative to getting a little better cooling, within reason.
So my trucks computer code is WBY5. The newest Ford codes is WBY7. I compared these two and noticed a change to the A/C settings.
WBY5
AC Head Pressure to Disable Clutch = 475
AC Head Pressure to Reenable Clutch = 340
WBY7
AC Head Pressure to Disable Clutch = 465
AC Head Pressure to Reenable Clutch = 340
So as you can see in the newer code, Ford lowered the PSI to Disable the Clutch. My truck still runs the older code WBY5. Generally you would think that if Ford creates and update, it should be "better". We know this is not always so. The question is, which would be better and why? I dont want to mess up my A/C system, but I'm looking at this as a possible alternative to getting a little better cooling, within reason.
What software are you talking about being able to view these settings?
.
08-09-2016, 04:17 PM
#452
Senior Member
I asked my tuner about that setting over a year ago. All that is for is a high trip limit to shut the compressor off if the head pressure gets to to high. Most properly charged systems run around 250psi so basically the setting isn't anything that would change anything.
Wayne
Wayne
08-09-2016, 04:18 PM
#453
BoostKing Tuning
The head pressure to reenable the clutch would be the important change and I see none, all they are doing is shutting the compressor down at a lower setting which is probably a good idea to keep from blowing a hose. It might also create an issue in that it would not cool the cabin off as the comp is being turned off sooner.
What software are you talking about being able to view these settings?
.
What software are you talking about being able to view these settings?
.
And by your statement above, there MAY be a benefit in re-enabling the clutch sooner. Maybe I should bump the re-enable pressure from 340 up to 350.
What possible negative affect could this have?
Advantage 3 by SCT
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2022 F150 Tremor - Current - BoostKing Custom Tuned 440whp on 93. --- 2022 Expedition Stealth H.O. - JB4 Only --- 2018 Mustang Hellion Sleeper - 907 whp on E85
08-09-2016, 04:37 PM
#454
So it would appear Ford lowered the PSI to shut the clutch off by 10, but left the re-enable threshold the same. Sounds like they did this to reduce head pressure and like you said lesson the risk of blowing a line. It seems the 2015+ all have the setting at 465.
And by your statement above, there MAY be a benefit in re-enabling the clutch sooner. Maybe I should bump the re-enable pressure from 340 up to 350.
What possible negative affect could this have?
Advantage 3 by SCT
And by your statement above, there MAY be a benefit in re-enabling the clutch sooner. Maybe I should bump the re-enable pressure from 340 up to 350.
What possible negative affect could this have?
Advantage 3 by SCT
They used a low side pressure switch to control comp cycle with an orifice tube design, but since they went back to the expansion valve design, that low switch is replaced with the evap core temp sensor, the one people are fooling with the resistor hack.
I'm going to do some research on that software. Thanks.
.
08-16-2016, 02:30 PM
#455
Member
DFW area has started cooling off - and I have to say, my A/C is good and cold, even on the hottest days. I have only insulated the lines, no resistor in the wires, but it's good (especially on the highway, at speed).
08-31-2016, 08:33 AM
#458
Senior Member
So it would appear Ford lowered the PSI to shut the clutch off by 10, but left the re-enable threshold the same. Sounds like they did this to reduce head pressure and like you said lesson the risk of blowing a line. It seems the 2015+ all have the setting at 465.
And by your statement above, there MAY be a benefit in re-enabling the clutch sooner. Maybe I should bump the re-enable pressure from 340 up to 350.
What possible negative affect could this have?
Advantage 3 by SCT
And by your statement above, there MAY be a benefit in re-enabling the clutch sooner. Maybe I should bump the re-enable pressure from 340 up to 350.
What possible negative affect could this have?
Advantage 3 by SCT
If they are using R410A, thee operating pressures are higher.
08-31-2016, 03:34 PM
#459
Senior Member
Never heard of using r410a in a vehicle.