What did you do to your P2 Volvo today?

dikidera · Post by **dikidera** » 30 Jun 2024, 03:56

Today I shall be attempting to overwrite part of the TCM adaptations to those before I added lubeguard. Every time I have flushed the gearbox with fresh oil it has performed much better for around 1km or so. Especially last year when I did 10l of flushing, the gearbox was so buttery smooth I could not believe it that it is such a shame I did not dump them back then.

I have correlated my EEPROM adaptations to those of the TCM's ram addresses(since they are read at startup and commited to EEPROM when modified when engine is off). As such I will create 3 or 4 groups and will create a loop to overwrite all the time the adaptations belonging to each group but only one group at a time. Once I have narrowed down a group of adaptations that significantly alter the gearbox's behaviour I will focus on that group and narrow down a particular value that strongly affects performance(specifically smoother shifts or faster shifts).

I wish to clarify a few terms. Shift speed = time between the gearbox starting to shift and completion of shift. Smoother shift = Less torque reduction during shift process. May as very well that a faster shift speed = smoother shift speed.

Code: Select all

    if group == 1:
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x46, 0xFF, 0xAA]) #changed
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x48, 0xFF, 0x54]) #changed
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x4A, 0xFF, 0x0E]) #changed
        
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x4C, 0xFD, 0x1E])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x4E, 0xFF, 0x3A])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x52, 0x00, 0x00])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x54, 0x00, 0x00])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x56, 0x00, 0x00])  #UNchanged
        
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x58, 0xFD, 0x33])  #changed
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x5A, 0xFE, 0xD7])  #changed
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x5C, 0xFD, 0xFF])  #changed
        
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x5E, 0xFC, 0xC2])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x60, 0xFC, 0xA5])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x62, 0x00, 0x00])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x64, 0x00, 0x00])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x66, 0x00, 0x00])  #UNchanged
        
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x68, 0x00, 0x4B])  #changed
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x6A, 0x00, 0xB1])  #changed
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x6C, 0xFF, 0x88])  #changed
        
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x6E, 0xFD, 0xF4])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x70, 0xFD, 0xD5])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x72, 0x00, 0x00])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x74, 0x00, 0x00])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x76, 0x00, 0x00])  #UNchanged
        
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x78, 0xFF, 0xCA])  #changed
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x7A, 0x00, 0xAD])  #changed
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x7C, 0xFF, 0xDD])  #changed
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x7E, 0x00, 0x00])  #changed
        
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x80, 0x01, 0x11])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x82, 0x00, 0x00])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x84, 0x00, 0x00])  #UNchanged
        send_can_message([0xCF, 0x6E, 0xBA, 0xFF, 0x8D, 0x86, 0x00, 0x00])  #UNchanged

You can see group 3(8D46) is the largest, it is a two-dimensional array indexed by gear and then by what I think is a oil temp region.. It's a torque region, but not current engine torque, but related to the stall speed.

so adaptation[gear_index][torqueregion_index]. Gear index however is shared by a few gears and is not updated during a downshift, only when upshifting.

Addendum: I have verified that when you have the car in Pos II and overwrite the RAM address that corresponds to these adaptation tables, they are updated in EEPROM when power off the car (Pos 0). As such I have indirect write access to the EEPROM.

It should be noted I am not touching the original adaptations that get erased when you reset the adaptations. I am only toying with those adaptations that continually adapt as you drive.

Addendum: I could not pinpoint a specific group that affected shifting more. However it turns out group 3 is a table of torques I now believe, which are used in a chain of variables, being stacked up together. At first I thought it was pressures, but the values are more akin to torques, since they seem to be related to this table that starts like so 350, 900, 1400, 1700, all the way up to 3300 which when divided by 10 is 330 or the natural limit of the gearbox as programmed in.

yanga001 · Post by **yanga001** » 03 Jul 2024, 09:51

reinstalled the high pressure headlight nozzle. Interestingly enough, nothing comes out of the drivers side nozzles, but they do extend outwards. The passenger side seems to spray double the amount it should and fully extends out.

Will fix it when time permits

TGHepburn · Post by **TGHepburn** » 03 Jul 2024, 20:08

Canada Day long weekend, 2024

Getting my 2004 XC70 ready to go....wait for it....cross country!. Alberta to Ontario and back via Northern USA. Car is at 475,000km (300000miles) and should be close to 1/2 million km when I get back.

Following is the "regular maintenance list"

Change Rear Diff oil.
Front brake inspection
Rear Brake service
Replaced Fuel Filter (Created an issue with fuel guage??)
Changed Plugs
Inspected Timing belt and lower-side water pump for any wear/leaks (belt due in 40000km)
Bought tires (Hankook Kinergy PT H737 (made in USA!) but will install at my brother's shop later

Now for the Big Ticket (and very overdue) repairs

Replace Trailing arm bushings
Replace Rear lower control arms
Replace Link bar bushings (Camber bolt seized in bushing both sides)

I'm sorry I did not take any pictures as I was in a rush. Take-away is to do each bushing seperately. The first side I tore everything down, replaced all then re-assembly was a challenge when bolts did not align. The other side was easier when doing each "arm" separately

I took a chance on these Polyurethane bushings but If the squeaking annoys me I will be pressing in rubber bushings. The allure for me was Powerflex had a good lookup diagram on their website. Other sites had miss-labelled parts and conflicting information - never sure I was ordering the right parts.

Of note: I pull a trailer with this car a lot. All the bushings I took out were factory original and in much better shape than I expected. Some I wondered why bother? they looked fine. Impressive.

TGHepburn · Post by **TGHepburn** » 03 Jul 2024, 20:15

yanga001 wrote: ↑03 Jul 2024, 09:51 reinstalled the high pressure headlight nozzle. Interestingly enough, nothing comes out of the drivers side nozzles, but they do extend outwards. The passenger side seems to spray double the amount it should and fully extends out.

Will fix it when time permits

LOL you just reminded me to pinch off mine. both wiper arms are gone for headlights. Little tube just hanging there. Back to the good old days of manually cleaning my headlights. Ugh.

SOURDOUGHJIM · Post by **SOURDOUGHJIM** » 05 Jul 2024, 10:42

Replace p/s pump suction line. Then noticed the pressure line was loose. Snugged it down. Refill with Pentofluid. Check for leaks, all seems OK now.

SOURDOUGHJIM · Post by **SOURDOUGHJIM** » 05 Jul 2024, 10:45

Replaced p/s pump suction line. Then noticed the pressure line was loose. Snugged it down, checked for leaks. All seems OK for now.

Post by **jonesg** » 07 Jul 2024, 07:15

spent 30 minutes on tire rack, can't even find a list of tires to choose from.

3 seconds on amazon and i got a slew of choices.
done.

Post by **abscate** » 08 Jul 2024, 03:21

Rolled the P2 into Brooklyn to return dog/girl after a week visit. Blessed is the P2 AC in 90F NYC muggy

Post by **850 LPT** » 08 Jul 2024, 06:43

My daughter came home from Boston for the holiday weekend and I changed the oil in her delightful 03' V70 2.4T. I used Mobil 1 Synthetic High Mileage from Walmart. They sell the 5 qt jug for an unbelievable $25. She used the time to thoroughly clean the interior and oil the seats.

Post by **Krons** » 09 Jul 2024, 17:05

Got the 05 XC90 away from my college kid for a week to send to my local Indy. 201k miles so got a timing belt, water pump and cam seals that had a slow leak since I bought it. Cam seals from FCP were wrong ones and leaked so they had to get others. Also fixed the AC and did the Haldex fluid and filter for me as it is a bear to get to on that vintage. $1200 but lots of time saved.

When it got home I replaced the front end with loaded TRQ struts, old ones were quite gone. Needs control arms and brakes but that’ll have to be another day.

What did you do to your P2 Volvo today?

Re: What did you do to your P2 Volvo today?