minimum pressure of 40%
minimum pressure of 40%
What do you think?
Dave
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- Posts: 1696
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Re: minimum pressure of 40%
If I recall correctly (I haven't looked at the code in detail for this in a while), the 40% limit is entirely in the INI. To change the limit, you need to find all the places in the INI it s specified and change it. This would be things like:
Code: Select all
PCneutral = scalar, U08, 120, "%", -1.00000, -100.00, 40, 100, 0 ; pressure in neutral
Code: Select all
pc_table = array, U08, 273, [16x9], "%", -1.00000, -100.00, 40, 100, 0 ; The PWM% for PC solenoid by load and mph
...
etc.
You change the value of 40 to something lower, and I believe it should work. In the meantime I will look for anything in the code that might interfere.
The lower limit of 40% is there to prevent people from burning up there transmissions internally (both the friction elements and the solenoids themselves from the higher current). But if you know what you are doing, you can probably go a bit lower.
Lance.
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- Joined: Fri Apr 04, 2008 1:28 pm
Re: minimum pressure of 40%
Re: minimum pressure of 40%
Dave
Re: minimum pressure of 40%
I tried what you suggested. After making the ini file changes, I was able to make the changes to the Tuner Studio input window. But there still appears to be a min floor logic occurring related to PC calcs when in Park. It would work for input of 41 and above, but when 40 or lower was entered, the PC% jumped up to 50%. Can you check the code?
BTW, 41% is still too harsh for me, when shifting out of Neutral. 41% for me generates 140psi.
Thanks,
Dave
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- Joined: Fri Apr 04, 2008 1:28 pm
Re: minimum pressure of 40%
Can you post your MSQ/modified INI and a datalog? I will have a look in the code shortly.
Lance.
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Re: minimum pressure of 40%
There is one 'fail-safe' in the code that might be stopping the line pressure from getting low enough for you.
The code checks all the 16x9 cell values, and makes sure the final value is not lower than the lowest table value. This was put in to make sure that rounding errors didn't force the line pressure into an unsafe state.
However, this does not check whether you are in PNR first, and it should do that (so that user settings for these gears are applied).
I will add this shortly and post some code here - are you using 4.1xx code or the 5.xxx series of code?
In the meantime, as a work-around you could try lowering the lowest value in your shift table (perhaps one of the lesser used table cell values - like highest-speed lowest-load) to see if lower values are achieved.
Lance.
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- Posts: 1696
- Joined: Fri Apr 04, 2008 1:28 pm
Re: minimum pressure of 40%
Here is some test code:
This code only checks for the lowest table value when:
- the table is not specified to be used by the user in reverse, or
- when in a forward gear.
It never checks in neutral.
This code is completely untested, so use with great caution.
Lance.
Re: minimum pressure of 40%
I am running 4.137. Haven't made the jump to 5.xxx due to the heavily customized ini to get line press and oil press (Aux) calibrated.
I'm still about a week out from getting this thing on the street for first drive, (for other reasons), so no rush.
Dave
Re: minimum pressure of 40%
Dave