Inlet air temperatures
Discussion
IAT on the EDI will drop to a few degrees above ambient when moving, monitor IAT2 with an OBD2 scanner and you will see them waaay high. Wouldn't be surprised if your setup is pushing 60 degrees on a hot day... Plug and play interchiller kit available from Aus in the next month or two..... Should be good for sub 10c IAT2's.
R8VXF said:
IAT on the EDI will drop to a few degrees above ambient when moving, monitor IAT2 with an OBD2 scanner and you will see them waaay high. Wouldn't be surprised if your setup is pushing 60 degrees on a hot day... Plug and play interchiller kit available from Aus in the next month or two..... Should be good for sub 10c IAT2's.
That's into timing pulling territory.R8VXF said:
Should be good for sub 10c IAT2's.
For how long though.MyM8V8 said:
R8VXF said:
IAT on the EDI will drop to a few degrees above ambient when moving, monitor IAT2 with an OBD2 scanner and you will see them waaay high. Wouldn't be surprised if your setup is pushing 60 degrees on a hot day... Plug and play interchiller kit available from Aus in the next month or two..... Should be good for sub 10c IAT2's.
That's into timing pulling territory.R8VXF said:
Should be good for sub 10c IAT2's.
For how long though.For as long as the air conditioning can keep the IC water cool
neiljohnson said:
Water meth is the way forward with inlet temps chiller kits are a waste of time imho
Running the ac heats the condenser & takes power from the engine to run so cancels the advantage out
The chillers probably are of some benefit for short blasts, but as always people ignore the huge benefits that come from water/meth in terms of ability to suppress detonation, which is where the real power release comes fromRunning the ac heats the condenser & takes power from the engine to run so cancels the advantage out
All the chiller units in the world wont match that benefit.
stevieturbo said:
The chillers probably are of some benefit for short blasts, but as always people ignore the huge benefits that come from water/meth in terms of ability to suppress detonation, which is where the real power release comes from
All the chiller units in the world wont match that benefit.
Agreed All the chiller units in the world wont match that benefit.
My Cars not tuned for the meth but intake temps on the same day without the water meth were 28-30 with the water meth switched on they were 17-19 so huge difference
Ambient temp was 22-23
Even on a dunk the intake temps didn't go over mid 20's
stevieturbo said:
neiljohnson said:
Water meth is the way forward with inlet temps chiller kits are a waste of time imho
Running the ac heats the condenser & takes power from the engine to run so cancels the advantage out
The chillers probably are of some benefit for short blasts, but as always people ignore the huge benefits that come from water/meth in terms of ability to suppress detonation, which is where the real power release comes fromRunning the ac heats the condenser & takes power from the engine to run so cancels the advantage out
All the chiller units in the world wont match that benefit.
And Neil, it has been proven on a dyno to have more power even with the aircon on.
IMO running both systems would be the ideal solution to keep temps low and protect the engine from det.
Let's hope GM don't still use these parameters eh? 
For reference, the AC parameters are described as follows:
A/C Minimum Off Time
This table is used to determine the minimum amount of time the A/C compressor must remain off once it is turned off, this is to prevent the A/C cycling on/off too fast.
A/C Disable TPS
If throttle position is above this value, then the A/C compressor will be turned off.
A/C Enable TPS
If the A/C compressor has been disabled due to high throttle position (TPS), then the TPS must fall below this value to re-enable the compressor.
A/C Disable RPM
If engine RPM is above this value at WOT, then the A/C compressor will be turned off.
A/C Enable RPM
If the A/C compressor has been disabled due to high RPM, then RPM's must fall below this value to re-enable the compressor.
A/C Disable Timer
If the A/C clutch has been disabled for a WOT condition it will remain off for this long even after the WOT condition no longer exists.
A/C Disable Max Timer
If the A/C clutch has been disabled for a WOT condition it can only remain off for the maximum amount of time specified by this parameter
A/C Disable TPS Timer
Minimum amount of time before the WOT disable can be activated again since the last time the A/C Clutch was disabled because of a WOT condition.
EDIT:
Assuming GM do still do this (it's quite possible they might not, no idea)
The chiller will still serve its purpose of getting the temps down, but I'd be skeptical of how well it could keep them down if you were pushing it for a while. You're likely to be moving by then though so they'll be lower anyway...
I imagine it'll work best for:
Traffic light grand prix
1/4 mile runs
Dyno pulls
Will it work at Thunder Road? Well you'd be starting from a much lower IAT so that's got to be of some benefit, but once you'd launched, your air con would be off.
For reference, the AC parameters are described as follows:
A/C Minimum Off Time
This table is used to determine the minimum amount of time the A/C compressor must remain off once it is turned off, this is to prevent the A/C cycling on/off too fast.
A/C Disable TPS
If throttle position is above this value, then the A/C compressor will be turned off.
A/C Enable TPS
If the A/C compressor has been disabled due to high throttle position (TPS), then the TPS must fall below this value to re-enable the compressor.
A/C Disable RPM
If engine RPM is above this value at WOT, then the A/C compressor will be turned off.
A/C Enable RPM
If the A/C compressor has been disabled due to high RPM, then RPM's must fall below this value to re-enable the compressor.
A/C Disable Timer
If the A/C clutch has been disabled for a WOT condition it will remain off for this long even after the WOT condition no longer exists.
A/C Disable Max Timer
If the A/C clutch has been disabled for a WOT condition it can only remain off for the maximum amount of time specified by this parameter
A/C Disable TPS Timer
Minimum amount of time before the WOT disable can be activated again since the last time the A/C Clutch was disabled because of a WOT condition.
EDIT:
Assuming GM do still do this (it's quite possible they might not, no idea)
The chiller will still serve its purpose of getting the temps down, but I'd be skeptical of how well it could keep them down if you were pushing it for a while. You're likely to be moving by then though so they'll be lower anyway...
I imagine it'll work best for:
Traffic light grand prix
1/4 mile runs
Dyno pulls
Will it work at Thunder Road? Well you'd be starting from a much lower IAT so that's got to be of some benefit, but once you'd launched, your air con would be off.
Edited by SturdyHSV on Friday 17th July 10:21
The above is quite relevant too. Chances are the A/C compressor wont like being spun too hard, hence they turn it off at higher rpm's
Exactly when you'd really be wanting the cooler to be working hard, especially if you're doing more than a few seconds hard throttle at a time.
The chiller will definitely be better than not having it at all though.
Exactly when you'd really be wanting the cooler to be working hard, especially if you're doing more than a few seconds hard throttle at a time.
The chiller will definitely be better than not having it at all though.
R8VXF said:
Easy enough to disable those settings so they don't kick in I would have thought. Why do they even do this anyway?
High speed disabling is to stop over-spinning the compressor and potentially blowing pipework or breaking the compressor. There is a flow rate on the A/C pipework that cannot be exceeded, just as there is on the engine itself. Disabling under WOT is to allow the power to go to the wheels, rather than ancillaries.
If the table is there for Monaros, I'm sure it will also be there for later generation cars. In theory, it should mean that there's no point in turning the A/C off when you're trying to use the performance of the engine - dyno, track, or drag strip.
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