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Genuine Volvo ATF is NOT Mobil 3309...

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vtl
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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by vtl »

T-IV is even thinner than Mobil.

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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by mrbrian200 »

I have trouble with that test. There may or may not be differences between these various 3309 spec fluids. But I refuse to form a conclusion on that. The fluid depth isn't the same between the little condiment cups (among other concerns).
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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by vtl »

In first video Mobil and Volvo have the same level, in second video Toyota and Volvo have the same level.
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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by vtl »

About a week since replaced the fluid. All gears except 3 are unnoticeable, cold or hot. 3 (mostly 2-3, sometimes 3-4) is erratic, it can shift smoothly one time and give a slight jolt another. I'll remove B4 servo cap and inspect what's inside. Pretty sure this behaviour is caused by B4 band/anchor/cover.

All the rest of transmission imperfections was totally cured by Volvo ATF. Plus the car pulls as equipped with a rocket booster :)
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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by vtl »

Ok, I've solved my 3 gear imperfection. I had a wastegate actuator shortened by 1 turn. Bought a tool from ARD, returned pressure back to stock 1.8 PSI. After 3 engine starts and maybe 20 miles transmission is fully cured, I drive a 12 years old car with 157k miles on the clock and a perfectly working original transmission.
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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by abscate »

Interesting Vtl. I know jim has warned people not to play with wastegate adjustment on late P80 and P2 cars, sounds like that's good advice
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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by vtl »

I had to back out 2.5 full turns to return to stock pressure sensitivity, while I did 1 turn only few years ago. Looks like wastegate gets tired over years and needs to be calibrated once in a while even if wastegate actuator was never touched.
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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by abscate »

Is that lengthening or shortening the rod?
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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by vtl »

Lengthening -> decrease wastegate activation pressure, shortening - increase.
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Re: Genuine Volvo ATF is NOT Mobil 3309...

Post by mrbrian200 »

vtl wrote:I had to back out 2.5 full turns to return to stock pressure sensitivity, while I did 1 turn only few years ago. Looks like wastegate gets tired over years and needs to be calibrated once in a while even if wastegate actuator was never touched.
I need to do that too. However...
I've been paying super close attention to mine I might also suggest the CBV operation starts becoming inconsistent with air temperature/heat soak conditions etc as they age. Some of this adjustment may be compensating for altered CBV properties. As with the wastegate actuator, operation is a combination of both spring/air pressure and the physical properties of the diaphragm itself.
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